./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loops/for_bounded_loop1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 6b5699aa Calling Ultimate with: /usr/lib/jvm/java-8-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_a438e5e5-8e99-4890-b701-958435313a23/bin/uautomizer/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/run_dir_a438e5e5-8e99-4890-b701-958435313a23/bin/uautomizer/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_a438e5e5-8e99-4890-b701-958435313a23/bin/uautomizer/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_a438e5e5-8e99-4890-b701-958435313a23/bin/uautomizer/config/AutomizerReach.xml -i ../../sv-benchmarks/c/loops/for_bounded_loop1.c -s /tmp/vcloud-vcloud-master/worker/run_dir_a438e5e5-8e99-4890-b701-958435313a23/bin/uautomizer/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_a438e5e5-8e99-4890-b701-958435313a23/bin/uautomizer --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(__VERIFIER_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 1a0e89cb1a2148382c7546df46cfbb79c04a1e70 ................................................................................................................................................................................................................................................................................................................................................ Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE --- Real Ultimate output --- This is Ultimate 0.1.24-6b5699a [2019-11-25 08:53:58,170 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-25 08:53:58,173 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-25 08:53:58,196 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-25 08:53:58,196 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-25 08:53:58,197 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-25 08:53:58,199 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-25 08:53:58,202 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-25 08:53:58,204 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-25 08:53:58,205 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-25 08:53:58,206 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-25 08:53:58,208 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-25 08:53:58,208 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-25 08:53:58,209 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-25 08:53:58,210 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-25 08:53:58,212 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-25 08:53:58,219 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-25 08:53:58,220 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-25 08:53:58,223 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-25 08:53:58,225 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-25 08:53:58,227 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-25 08:53:58,228 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-25 08:53:58,229 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-25 08:53:58,230 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-25 08:53:58,233 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-11-25 08:53:58,234 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-11-25 08:53:58,234 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-11-25 08:53:58,235 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-11-25 08:53:58,236 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-11-25 08:53:58,237 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-11-25 08:53:58,237 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-11-25 08:53:58,238 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-11-25 08:53:58,239 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-11-25 08:53:58,239 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-11-25 08:53:58,241 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-11-25 08:53:58,241 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-11-25 08:53:58,242 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-11-25 08:53:58,242 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-11-25 08:53:58,242 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-25 08:53:58,243 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-25 08:53:58,244 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-25 08:53:58,244 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_a438e5e5-8e99-4890-b701-958435313a23/bin/uautomizer/config/svcomp-Reach-32bit-Automizer_Default.epf [2019-11-25 08:53:58,259 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-25 08:53:58,260 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-25 08:53:58,261 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-25 08:53:58,261 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-25 08:53:58,261 INFO L138 SettingsManager]: * Use SBE=true [2019-11-25 08:53:58,262 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-25 08:53:58,262 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-25 08:53:58,262 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-25 08:53:58,262 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-25 08:53:58,263 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-25 08:53:58,263 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-25 08:53:58,263 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-25 08:53:58,264 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-25 08:53:58,264 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-25 08:53:58,264 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-25 08:53:58,264 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-25 08:53:58,265 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-25 08:53:58,265 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-25 08:53:58,265 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-25 08:53:58,265 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-25 08:53:58,266 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-25 08:53:58,266 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-25 08:53:58,266 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-25 08:53:58,267 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-25 08:53:58,267 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-25 08:53:58,267 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-25 08:53:58,267 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-25 08:53:58,268 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-25 08:53:58,268 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_a438e5e5-8e99-4890-b701-958435313a23/bin/uautomizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(__VERIFIER_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 1a0e89cb1a2148382c7546df46cfbb79c04a1e70 [2019-11-25 08:53:58,441 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-25 08:53:58,452 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-25 08:53:58,456 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-25 08:53:58,457 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-25 08:53:58,458 INFO L275 PluginConnector]: CDTParser initialized [2019-11-25 08:53:58,458 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_a438e5e5-8e99-4890-b701-958435313a23/bin/uautomizer/../../sv-benchmarks/c/loops/for_bounded_loop1.c [2019-11-25 08:53:58,518 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_a438e5e5-8e99-4890-b701-958435313a23/bin/uautomizer/data/749e523ca/aee4e8aa33b7450f88a98bc57abfcbbd/FLAG8e888c2ac [2019-11-25 08:53:58,896 INFO L306 CDTParser]: Found 1 translation units. [2019-11-25 08:53:58,896 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_a438e5e5-8e99-4890-b701-958435313a23/sv-benchmarks/c/loops/for_bounded_loop1.c [2019-11-25 08:53:58,903 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_a438e5e5-8e99-4890-b701-958435313a23/bin/uautomizer/data/749e523ca/aee4e8aa33b7450f88a98bc57abfcbbd/FLAG8e888c2ac [2019-11-25 08:53:59,292 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_a438e5e5-8e99-4890-b701-958435313a23/bin/uautomizer/data/749e523ca/aee4e8aa33b7450f88a98bc57abfcbbd [2019-11-25 08:53:59,295 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-25 08:53:59,296 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2019-11-25 08:53:59,298 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-25 08:53:59,298 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-25 08:53:59,302 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-25 08:53:59,303 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 08:53:59" (1/1) ... [2019-11-25 08:53:59,305 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@23789068 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:53:59, skipping insertion in model container [2019-11-25 08:53:59,306 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 08:53:59" (1/1) ... [2019-11-25 08:53:59,314 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2019-11-25 08:53:59,330 INFO L179 MainTranslator]: Built tables and reachable declarations [2019-11-25 08:53:59,484 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-25 08:53:59,489 INFO L201 MainTranslator]: Completed pre-run [2019-11-25 08:53:59,507 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-25 08:53:59,595 INFO L205 MainTranslator]: Completed translation [2019-11-25 08:53:59,595 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:53:59 WrapperNode [2019-11-25 08:53:59,595 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-25 08:53:59,596 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-11-25 08:53:59,596 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-11-25 08:53:59,596 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2019-11-25 08:53:59,610 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:53:59" (1/1) ... [2019-11-25 08:53:59,617 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:53:59" (1/1) ... [2019-11-25 08:53:59,635 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-11-25 08:53:59,635 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-25 08:53:59,635 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-25 08:53:59,635 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-25 08:53:59,645 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:53:59" (1/1) ... [2019-11-25 08:53:59,646 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:53:59" (1/1) ... [2019-11-25 08:53:59,647 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:53:59" (1/1) ... [2019-11-25 08:53:59,647 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:53:59" (1/1) ... [2019-11-25 08:53:59,649 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:53:59" (1/1) ... [2019-11-25 08:53:59,654 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:53:59" (1/1) ... [2019-11-25 08:53:59,655 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:53:59" (1/1) ... [2019-11-25 08:53:59,657 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-25 08:53:59,658 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-25 08:53:59,658 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-25 08:53:59,658 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-25 08:53:59,659 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:53:59" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_a438e5e5-8e99-4890-b701-958435313a23/bin/uautomizer/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 [2019-11-25 08:53:59,732 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-25 08:53:59,733 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-25 08:54:00,019 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-25 08:54:00,019 INFO L284 CfgBuilder]: Removed 11 assume(true) statements. [2019-11-25 08:54:00,020 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 08:54:00 BoogieIcfgContainer [2019-11-25 08:54:00,020 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-25 08:54:00,021 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-25 08:54:00,022 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-25 08:54:00,025 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-25 08:54:00,026 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 08:53:59" (1/3) ... [2019-11-25 08:54:00,027 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@764f7c0b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 08:54:00, skipping insertion in model container [2019-11-25 08:54:00,027 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:53:59" (2/3) ... [2019-11-25 08:54:00,027 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@764f7c0b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 08:54:00, skipping insertion in model container [2019-11-25 08:54:00,028 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 08:54:00" (3/3) ... [2019-11-25 08:54:00,030 INFO L109 eAbstractionObserver]: Analyzing ICFG for_bounded_loop1.c [2019-11-25 08:54:00,056 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-25 08:54:00,063 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 3 error locations. [2019-11-25 08:54:00,090 INFO L249 AbstractCegarLoop]: Starting to check reachability of 3 error locations. [2019-11-25 08:54:00,131 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-25 08:54:00,131 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-25 08:54:00,131 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-25 08:54:00,132 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-25 08:54:00,132 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-25 08:54:00,132 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-25 08:54:00,132 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-25 08:54:00,132 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-25 08:54:00,150 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2019-11-25 08:54:00,155 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2019-11-25 08:54:00,156 INFO L402 BasicCegarLoop]: Found error trace [2019-11-25 08:54:00,157 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2019-11-25 08:54:00,157 INFO L410 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-25 08:54:00,164 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-25 08:54:00,165 INFO L82 PathProgramCache]: Analyzing trace with hash 29745418, now seen corresponding path program 1 times [2019-11-25 08:54:00,175 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-25 08:54:00,175 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1624490757] [2019-11-25 08:54:00,176 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-25 08:54:00,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-25 08:54:00,385 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-25 08:54:00,385 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1624490757] [2019-11-25 08:54:00,386 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-25 08:54:00,386 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-25 08:54:00,388 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1659234259] [2019-11-25 08:54:00,393 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-25 08:54:00,394 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-25 08:54:00,407 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-25 08:54:00,408 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-11-25 08:54:00,411 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 4 states. [2019-11-25 08:54:00,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-25 08:54:00,509 INFO L93 Difference]: Finished difference Result 48 states and 61 transitions. [2019-11-25 08:54:00,510 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-11-25 08:54:00,511 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 5 [2019-11-25 08:54:00,511 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-25 08:54:00,519 INFO L225 Difference]: With dead ends: 48 [2019-11-25 08:54:00,519 INFO L226 Difference]: Without dead ends: 22 [2019-11-25 08:54:00,522 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2019-11-25 08:54:00,535 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2019-11-25 08:54:00,548 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 18. [2019-11-25 08:54:00,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2019-11-25 08:54:00,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2019-11-25 08:54:00,552 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 5 [2019-11-25 08:54:00,552 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-25 08:54:00,552 INFO L462 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2019-11-25 08:54:00,553 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-25 08:54:00,553 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2019-11-25 08:54:00,553 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2019-11-25 08:54:00,553 INFO L402 BasicCegarLoop]: Found error trace [2019-11-25 08:54:00,553 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2019-11-25 08:54:00,554 INFO L410 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-25 08:54:00,554 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-25 08:54:00,554 INFO L82 PathProgramCache]: Analyzing trace with hash 922077226, now seen corresponding path program 1 times [2019-11-25 08:54:00,554 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-25 08:54:00,555 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1190692516] [2019-11-25 08:54:00,555 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-25 08:54:00,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-25 08:54:00,573 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-25 08:54:00,573 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1190692516] [2019-11-25 08:54:00,573 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-25 08:54:00,573 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-25 08:54:00,574 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1804908559] [2019-11-25 08:54:00,575 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-25 08:54:00,576 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-25 08:54:00,576 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-25 08:54:00,576 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-25 08:54:00,576 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 3 states. [2019-11-25 08:54:00,597 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-25 08:54:00,597 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2019-11-25 08:54:00,598 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-25 08:54:00,598 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 6 [2019-11-25 08:54:00,598 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-25 08:54:00,599 INFO L225 Difference]: With dead ends: 22 [2019-11-25 08:54:00,599 INFO L226 Difference]: Without dead ends: 18 [2019-11-25 08:54:00,600 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-25 08:54:00,601 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2019-11-25 08:54:00,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2019-11-25 08:54:00,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2019-11-25 08:54:00,605 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2019-11-25 08:54:00,605 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 6 [2019-11-25 08:54:00,605 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-25 08:54:00,605 INFO L462 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2019-11-25 08:54:00,605 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-25 08:54:00,606 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2019-11-25 08:54:00,606 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2019-11-25 08:54:00,606 INFO L402 BasicCegarLoop]: Found error trace [2019-11-25 08:54:00,606 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2019-11-25 08:54:00,607 INFO L410 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-25 08:54:00,607 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-25 08:54:00,607 INFO L82 PathProgramCache]: Analyzing trace with hash 1387310901, now seen corresponding path program 1 times [2019-11-25 08:54:00,607 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-25 08:54:00,608 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [210197976] [2019-11-25 08:54:00,608 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-25 08:54:00,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-25 08:54:00,755 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-25 08:54:00,755 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [210197976] [2019-11-25 08:54:00,756 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-25 08:54:00,756 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-11-25 08:54:00,756 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [66953985] [2019-11-25 08:54:00,756 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-11-25 08:54:00,757 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-25 08:54:00,757 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-11-25 08:54:00,757 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2019-11-25 08:54:00,757 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 6 states. [2019-11-25 08:54:00,953 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-25 08:54:00,954 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2019-11-25 08:54:00,954 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-11-25 08:54:00,955 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 8 [2019-11-25 08:54:00,955 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-25 08:54:00,955 INFO L225 Difference]: With dead ends: 19 [2019-11-25 08:54:00,956 INFO L226 Difference]: Without dead ends: 15 [2019-11-25 08:54:00,956 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=35, Invalid=55, Unknown=0, NotChecked=0, Total=90 [2019-11-25 08:54:00,957 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2019-11-25 08:54:00,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 13. [2019-11-25 08:54:00,960 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2019-11-25 08:54:00,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2019-11-25 08:54:00,960 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 8 [2019-11-25 08:54:00,961 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-25 08:54:00,961 INFO L462 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2019-11-25 08:54:00,961 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-11-25 08:54:00,961 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2019-11-25 08:54:00,962 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2019-11-25 08:54:00,962 INFO L402 BasicCegarLoop]: Found error trace [2019-11-25 08:54:00,962 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-25 08:54:00,962 INFO L410 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-25 08:54:00,963 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-25 08:54:00,963 INFO L82 PathProgramCache]: Analyzing trace with hash 681382811, now seen corresponding path program 1 times [2019-11-25 08:54:00,963 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-25 08:54:00,963 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [169140566] [2019-11-25 08:54:00,963 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-25 08:54:01,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-11-25 08:54:01,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-11-25 08:54:01,063 INFO L174 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2019-11-25 08:54:01,063 INFO L475 BasicCegarLoop]: Counterexample might be feasible [2019-11-25 08:54:01,081 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 25.11 08:54:01 BoogieIcfgContainer [2019-11-25 08:54:01,082 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2019-11-25 08:54:01,082 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2019-11-25 08:54:01,082 INFO L271 PluginConnector]: Initializing Witness Printer... [2019-11-25 08:54:01,082 INFO L275 PluginConnector]: Witness Printer initialized [2019-11-25 08:54:01,083 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 08:54:00" (3/4) ... [2019-11-25 08:54:01,085 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2019-11-25 08:54:01,129 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_a438e5e5-8e99-4890-b701-958435313a23/bin/uautomizer/witness.graphml [2019-11-25 08:54:01,130 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2019-11-25 08:54:01,132 INFO L168 Benchmark]: Toolchain (without parser) took 1834.93 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 136.8 MB). Free memory was 950.1 MB in the beginning and 1.1 GB in the end (delta: -102.6 MB). Peak memory consumption was 34.3 MB. Max. memory is 11.5 GB. [2019-11-25 08:54:01,132 INFO L168 Benchmark]: CDTParser took 0.23 ms. Allocated memory is still 1.0 GB. Free memory is still 967.5 MB. There was no memory consumed. Max. memory is 11.5 GB. [2019-11-25 08:54:01,133 INFO L168 Benchmark]: CACSL2BoogieTranslator took 297.88 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 136.8 MB). Free memory was 950.1 MB in the beginning and 1.1 GB in the end (delta: -182.7 MB). Peak memory consumption was 23.5 MB. Max. memory is 11.5 GB. [2019-11-25 08:54:01,134 INFO L168 Benchmark]: Boogie Procedure Inliner took 38.99 ms. Allocated memory is still 1.2 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB. [2019-11-25 08:54:01,134 INFO L168 Benchmark]: Boogie Preprocessor took 22.13 ms. Allocated memory is still 1.2 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB. [2019-11-25 08:54:01,134 INFO L168 Benchmark]: RCFGBuilder took 362.88 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 18.3 MB). Peak memory consumption was 18.3 MB. Max. memory is 11.5 GB. [2019-11-25 08:54:01,135 INFO L168 Benchmark]: TraceAbstraction took 1060.39 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 53.7 MB). Peak memory consumption was 53.7 MB. Max. memory is 11.5 GB. [2019-11-25 08:54:01,136 INFO L168 Benchmark]: Witness Printer took 47.56 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 5.4 MB). Peak memory consumption was 5.4 MB. Max. memory is 11.5 GB. [2019-11-25 08:54:01,138 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 1.0 GB. Free memory is still 967.5 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 297.88 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 136.8 MB). Free memory was 950.1 MB in the beginning and 1.1 GB in the end (delta: -182.7 MB). Peak memory consumption was 23.5 MB. Max. memory is 11.5 GB. * Boogie Procedure Inliner took 38.99 ms. Allocated memory is still 1.2 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB. * Boogie Preprocessor took 22.13 ms. Allocated memory is still 1.2 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB. * RCFGBuilder took 362.88 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 18.3 MB). Peak memory consumption was 18.3 MB. Max. memory is 11.5 GB. * TraceAbstraction took 1060.39 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 53.7 MB). Peak memory consumption was 53.7 MB. Max. memory is 11.5 GB. * Witness Printer took 47.56 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 5.4 MB). Peak memory consumption was 5.4 MB. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 6]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L14] int i=0, x=0, y=0; [L15] int n=__VERIFIER_nondet_int(); [L16] COND FALSE !(!(n>0)) [L17] i=0 [L17] COND TRUE i