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/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf --abstractinterpretationv2.abstract.domain IntervalDomain -i ../../../trunk/examples/svcomp/systemc/pc_sfifo_1.cil-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-f4eb214f-m [2019-10-14 00:47:36,776 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-14 00:47:36,779 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-14 00:47:36,797 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2019-10-14 00:47:36,849 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-14 00:47:36,851 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-14 00:47:36,852 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-14 00:47:36,853 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2019-10-14 00:47:36,878 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-14 00:47:36,878 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-14 00:47:36,880 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-14 00:47:36,881 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-14 00:47:36,881 INFO L138 SettingsManager]: * Use SBE=true [2019-10-14 00:47:36,881 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-14 00:47:36,881 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-14 00:47:36,881 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-14 00:47:36,882 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-14 00:47:36,882 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-14 00:47:36,882 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-14 00:47:36,882 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-14 00:47:36,882 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-14 00:47:36,883 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-14 00:47:36,883 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-14 00:47:36,883 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-14 00:47:36,883 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-14 00:47:36,884 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-14 00:47:36,884 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-14 00:47:36,884 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-14 00:47:36,884 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-14 00:47:36,884 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-14 00:47:36,885 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-14 00:47:36,885 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-14 00:47:36,885 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-14 00:47:36,885 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-14 00:47:36,885 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-14 00:47:36,886 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-14 00:47:36,886 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.analysis.abstractinterpretationv2: Abstract domain -> IntervalDomain [2019-10-14 00:47:37,165 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-14 00:47:37,179 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-14 00:47:37,183 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-14 00:47:37,185 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-14 00:47:37,185 INFO L275 PluginConnector]: CDTParser initialized [2019-10-14 00:47:37,186 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/systemc/pc_sfifo_1.cil-1.c [2019-10-14 00:47:37,252 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/559752cd9/ce1674c1320f42a58029a02e65c36e42/FLAGdb3b46a7c [2019-10-14 00:47:37,729 INFO L306 CDTParser]: Found 1 translation units. [2019-10-14 00:47:37,729 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/systemc/pc_sfifo_1.cil-1.c [2019-10-14 00:47:37,739 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/559752cd9/ce1674c1320f42a58029a02e65c36e42/FLAGdb3b46a7c [2019-10-14 00:47:38,129 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/559752cd9/ce1674c1320f42a58029a02e65c36e42 [2019-10-14 00:47:38,140 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-14 00:47:38,141 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-14 00:47:38,143 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-14 00:47:38,144 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-14 00:47:38,147 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-14 00:47:38,149 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.10 12:47:38" (1/1) ... [2019-10-14 00:47:38,156 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@32777701 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 12:47:38, skipping insertion in model container [2019-10-14 00:47:38,157 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.10 12:47:38" (1/1) ... [2019-10-14 00:47:38,165 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-14 00:47:38,194 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-14 00:47:38,415 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-14 00:47:38,422 INFO L188 MainTranslator]: Completed pre-run [2019-10-14 00:47:38,489 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-14 00:47:38,612 INFO L192 MainTranslator]: Completed translation [2019-10-14 00:47:38,613 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 12:47:38 WrapperNode [2019-10-14 00:47:38,613 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-14 00:47:38,614 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-14 00:47:38,614 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-14 00:47:38,614 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-14 00:47:38,624 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 12:47:38" (1/1) ... [2019-10-14 00:47:38,625 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 12:47:38" (1/1) ... [2019-10-14 00:47:38,632 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 12:47:38" (1/1) ... [2019-10-14 00:47:38,632 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 12:47:38" (1/1) ... [2019-10-14 00:47:38,643 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 12:47:38" (1/1) ... [2019-10-14 00:47:38,651 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 12:47:38" (1/1) ... [2019-10-14 00:47:38,653 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 12:47:38" (1/1) ... [2019-10-14 00:47:38,656 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-14 00:47:38,657 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-14 00:47:38,657 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-14 00:47:38,657 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-14 00:47:38,658 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 12:47:38" (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 [2019-10-14 00:47:38,711 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-14 00:47:38,711 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-14 00:47:38,711 INFO L138 BoogieDeclarations]: Found implementation of procedure error [2019-10-14 00:47:38,712 INFO L138 BoogieDeclarations]: Found implementation of procedure is_do_write_p_triggered [2019-10-14 00:47:38,712 INFO L138 BoogieDeclarations]: Found implementation of procedure is_do_read_c_triggered [2019-10-14 00:47:38,712 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify_threads [2019-10-14 00:47:38,712 INFO L138 BoogieDeclarations]: Found implementation of procedure do_write_p [2019-10-14 00:47:38,712 INFO L138 BoogieDeclarations]: Found implementation of procedure do_read_c [2019-10-14 00:47:38,712 INFO L138 BoogieDeclarations]: Found implementation of procedure init_threads [2019-10-14 00:47:38,713 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread [2019-10-14 00:47:38,713 INFO L138 BoogieDeclarations]: Found implementation of procedure eval [2019-10-14 00:47:38,713 INFO L138 BoogieDeclarations]: Found implementation of procedure stop_simulation [2019-10-14 00:47:38,713 INFO L138 BoogieDeclarations]: Found implementation of procedure start_simulation [2019-10-14 00:47:38,713 INFO L138 BoogieDeclarations]: Found implementation of procedure init_model [2019-10-14 00:47:38,713 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-14 00:47:38,714 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-14 00:47:38,714 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-10-14 00:47:38,714 INFO L130 BoogieDeclarations]: Found specification of procedure error [2019-10-14 00:47:38,714 INFO L130 BoogieDeclarations]: Found specification of procedure is_do_write_p_triggered [2019-10-14 00:47:38,714 INFO L130 BoogieDeclarations]: Found specification of procedure is_do_read_c_triggered [2019-10-14 00:47:38,715 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify_threads [2019-10-14 00:47:38,715 INFO L130 BoogieDeclarations]: Found specification of procedure do_write_p [2019-10-14 00:47:38,715 INFO L130 BoogieDeclarations]: Found specification of procedure do_read_c [2019-10-14 00:47:38,715 INFO L130 BoogieDeclarations]: Found specification of procedure init_threads [2019-10-14 00:47:38,715 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread [2019-10-14 00:47:38,715 INFO L130 BoogieDeclarations]: Found specification of procedure eval [2019-10-14 00:47:38,716 INFO L130 BoogieDeclarations]: Found specification of procedure stop_simulation [2019-10-14 00:47:38,716 INFO L130 BoogieDeclarations]: Found specification of procedure start_simulation [2019-10-14 00:47:38,716 INFO L130 BoogieDeclarations]: Found specification of procedure init_model [2019-10-14 00:47:38,716 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-14 00:47:38,716 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-14 00:47:38,716 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-14 00:47:39,129 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-14 00:47:39,129 INFO L284 CfgBuilder]: Removed 4 assume(true) statements. [2019-10-14 00:47:39,131 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.10 12:47:39 BoogieIcfgContainer [2019-10-14 00:47:39,131 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-14 00:47:39,131 INFO L113 PluginConnector]: ------------------------Abstract Interpretation---------------------------- [2019-10-14 00:47:39,132 INFO L271 PluginConnector]: Initializing Abstract Interpretation... [2019-10-14 00:47:39,132 INFO L275 PluginConnector]: Abstract Interpretation initialized [2019-10-14 00:47:39,133 INFO L185 PluginConnector]: Executing the observer AbstractInterpretationRcfgObserver from plugin Abstract Interpretation for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.10 12:47:39" (1/1) ... [2019-10-14 00:47:39,169 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-10-14 00:47:54,838 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2019-10-14 00:47:54,867 INFO L272 AbstractInterpreter]: Visited 140 different actions 64732 times. Merged at 78 different actions 24280 times. Widened at 11 different actions 163 times. Performed 291775 root evaluator evaluations with a maximum evaluation depth of 4. Performed 291775 inverse root evaluator evaluations with a maximum inverse evaluation depth of 4. Found 4470 fixpoints after 28 different actions. Largest state had 36 variables. [2019-10-14 00:47:54,867 INFO L132 PluginConnector]: ------------------------ END Abstract Interpretation---------------------------- [2019-10-14 00:47:54,870 INFO L168 Benchmark]: Toolchain (without parser) took 16728.06 ms. Allocated memory was 138.4 MB in the beginning and 1.1 GB in the end (delta: 924.3 MB). Free memory was 103.6 MB in the beginning and 900.2 MB in the end (delta: -796.6 MB). Peak memory consumption was 127.7 MB. Max. memory is 7.1 GB. [2019-10-14 00:47:54,871 INFO L168 Benchmark]: CDTParser took 0.23 ms. Allocated memory is still 138.4 MB. Free memory was 121.7 MB in the beginning and 121.5 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2019-10-14 00:47:54,873 INFO L168 Benchmark]: CACSL2BoogieTranslator took 470.04 ms. Allocated memory was 138.4 MB in the beginning and 204.5 MB in the end (delta: 66.1 MB). Free memory was 103.4 MB in the beginning and 182.3 MB in the end (delta: -78.9 MB). Peak memory consumption was 25.2 MB. Max. memory is 7.1 GB. [2019-10-14 00:47:54,874 INFO L168 Benchmark]: Boogie Preprocessor took 42.90 ms. Allocated memory is still 204.5 MB. Free memory was 182.3 MB in the beginning and 180.2 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 7.1 GB. [2019-10-14 00:47:54,875 INFO L168 Benchmark]: RCFGBuilder took 474.05 ms. Allocated memory is still 204.5 MB. Free memory was 180.2 MB in the beginning and 154.8 MB in the end (delta: 25.4 MB). Peak memory consumption was 25.4 MB. Max. memory is 7.1 GB. [2019-10-14 00:47:54,876 INFO L168 Benchmark]: Abstract Interpretation took 15735.58 ms. Allocated memory was 204.5 MB in the beginning and 1.1 GB in the end (delta: 858.3 MB). Free memory was 154.1 MB in the beginning and 900.2 MB in the end (delta: -746.0 MB). Peak memory consumption was 112.2 MB. Max. memory is 7.1 GB. [2019-10-14 00:47:54,880 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 138.4 MB. Free memory was 121.7 MB in the beginning and 121.5 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 470.04 ms. Allocated memory was 138.4 MB in the beginning and 204.5 MB in the end (delta: 66.1 MB). Free memory was 103.4 MB in the beginning and 182.3 MB in the end (delta: -78.9 MB). Peak memory consumption was 25.2 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 42.90 ms. Allocated memory is still 204.5 MB. Free memory was 182.3 MB in the beginning and 180.2 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 7.1 GB. * RCFGBuilder took 474.05 ms. Allocated memory is still 204.5 MB. Free memory was 180.2 MB in the beginning and 154.8 MB in the end (delta: 25.4 MB). Peak memory consumption was 25.4 MB. Max. memory is 7.1 GB. * Abstract Interpretation took 15735.58 ms. Allocated memory was 204.5 MB in the beginning and 1.1 GB in the end (delta: 858.3 MB). Free memory was 154.1 MB in the beginning and 900.2 MB in the end (delta: -746.0 MB). Peak memory consumption was 112.2 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.analysis.abstractinterpretationv2: - UnprovableResult [Line: 9]: 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: [L14] int q_buf_0 ; [L15] int q_free ; [L16] int q_read_ev ; [L17] int q_write_ev ; [L18] int p_num_write ; [L19] int p_last_write ; [L20] int p_dw_st ; [L21] int p_dw_pc ; [L22] int p_dw_i ; [L23] int c_num_read ; [L24] int c_last_read ; [L25] int c_dr_st ; [L26] int c_dr_pc ; [L27] int c_dr_i ; [L134] static int a_t ; [L350] int __retres1 ; [L354] CALL init_model() [L336] q_free = 1 [L337] q_write_ev = 2 [L338] q_read_ev = q_write_ev [L339] p_num_write = 0 [L340] p_dw_pc = 0 [L341] p_dw_i = 1 [L342] c_num_read = 0 [L343] c_dr_pc = 0 [L344] c_dr_i = 1 [L354] RET init_model() [L355] CALL start_simulation() [L304] int kernel_st ; [L305] int tmp ; [L309] kernel_st = 0 [L310] CALL init_threads() [L196] COND TRUE (int )p_dw_i == 1 [L197] p_dw_st = 0 [L201] COND TRUE (int )c_dr_i == 1 [L202] c_dr_st = 0 [L310] RET init_threads() [L313] COND TRUE 1 [L316] kernel_st = 1 [L317] CALL eval() [L231] int tmp ; [L232] int tmp___0 ; [L233] int tmp___1 ; [L237] COND TRUE 1 [L240] CALL, EXPR exists_runnable_thread() [L211] int __retres1 ; [L214] COND TRUE (int )p_dw_st == 0 [L215] __retres1 = 1 [L227] return (__retres1); [L240] RET, EXPR exists_runnable_thread() [L240] tmp___1 = exists_runnable_thread() [L242] COND TRUE \read(tmp___1) [L247] COND TRUE (int )p_dw_st == 0 [L249] tmp = __VERIFIER_nondet_int() [L251] COND FALSE !(\read(tmp)) [L257] CALL error() [L9] __VERIFIER_error() RESULT: Ultimate could not prove your program: unable to determine feasibility of some traces Received shutdown request...