./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 678e0110 Calling Ultimate with: /usr/lib/jvm/java-8-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_d44e825e-d41d-4925-8b2a-c495b1cea185/bin/uautomizer/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/run_dir_d44e825e-d41d-4925-8b2a-c495b1cea185/bin/uautomizer/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_d44e825e-d41d-4925-8b2a-c495b1cea185/bin/uautomizer/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_d44e825e-d41d-4925-8b2a-c495b1cea185/bin/uautomizer/config/AutomizerReach.xml -i ../../sv-benchmarks/c/loops/for_bounded_loop1.c -s /tmp/vcloud-vcloud-master/worker/run_dir_d44e825e-d41d-4925-8b2a-c495b1cea185/bin/uautomizer/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_d44e825e-d41d-4925-8b2a-c495b1cea185/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 0.1.24-678e011 [2019-11-20 01:48:50,582 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-20 01:48:50,584 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-20 01:48:50,600 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-20 01:48:50,601 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-20 01:48:50,602 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-20 01:48:50,605 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-20 01:48:50,615 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-20 01:48:50,620 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-20 01:48:50,623 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-20 01:48:50,625 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-20 01:48:50,626 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-20 01:48:50,626 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-20 01:48:50,627 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-20 01:48:50,628 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-20 01:48:50,629 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-20 01:48:50,630 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-20 01:48:50,631 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-20 01:48:50,633 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-20 01:48:50,645 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-20 01:48:50,651 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-20 01:48:50,653 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-20 01:48:50,656 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-20 01:48:50,657 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-20 01:48:50,660 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-11-20 01:48:50,661 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-11-20 01:48:50,662 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-11-20 01:48:50,663 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-11-20 01:48:50,664 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-11-20 01:48:50,665 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-11-20 01:48:50,665 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-11-20 01:48:50,666 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-11-20 01:48:50,667 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-11-20 01:48:50,668 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-11-20 01:48:50,669 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-11-20 01:48:50,669 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-11-20 01:48:50,670 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-11-20 01:48:50,670 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-11-20 01:48:50,670 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-20 01:48:50,671 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-20 01:48:50,672 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-20 01:48:50,673 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_d44e825e-d41d-4925-8b2a-c495b1cea185/bin/uautomizer/config/svcomp-Reach-32bit-Automizer_Default.epf [2019-11-20 01:48:50,704 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-20 01:48:50,704 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-20 01:48:50,705 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-20 01:48:50,706 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-20 01:48:50,706 INFO L138 SettingsManager]: * Use SBE=true [2019-11-20 01:48:50,706 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-20 01:48:50,706 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-20 01:48:50,707 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-20 01:48:50,707 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-20 01:48:50,707 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-20 01:48:50,707 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-20 01:48:50,707 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-20 01:48:50,708 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-20 01:48:50,708 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-20 01:48:50,708 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-20 01:48:50,708 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-20 01:48:50,709 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-20 01:48:50,709 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-20 01:48:50,709 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-20 01:48:50,709 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-20 01:48:50,710 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-20 01:48:50,710 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-20 01:48:50,710 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-20 01:48:50,710 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-20 01:48:50,710 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-20 01:48:50,711 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-20 01:48:50,711 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-20 01:48:50,711 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-20 01:48:50,711 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_d44e825e-d41d-4925-8b2a-c495b1cea185/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 [2019-11-20 01:48:50,905 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-20 01:48:50,918 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-20 01:48:50,921 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-20 01:48:50,923 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-20 01:48:50,924 INFO L275 PluginConnector]: CDTParser initialized [2019-11-20 01:48:50,924 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_d44e825e-d41d-4925-8b2a-c495b1cea185/bin/uautomizer/../../sv-benchmarks/c/loops/for_bounded_loop1.c [2019-11-20 01:48:50,986 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_d44e825e-d41d-4925-8b2a-c495b1cea185/bin/uautomizer/data/00eba2521/2c3d7c45c33e4813a039a8de0a7a1bae/FLAGb025e75ef [2019-11-20 01:48:51,446 INFO L306 CDTParser]: Found 1 translation units. [2019-11-20 01:48:51,447 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_d44e825e-d41d-4925-8b2a-c495b1cea185/sv-benchmarks/c/loops/for_bounded_loop1.c [2019-11-20 01:48:51,457 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_d44e825e-d41d-4925-8b2a-c495b1cea185/bin/uautomizer/data/00eba2521/2c3d7c45c33e4813a039a8de0a7a1bae/FLAGb025e75ef [2019-11-20 01:48:51,848 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_d44e825e-d41d-4925-8b2a-c495b1cea185/bin/uautomizer/data/00eba2521/2c3d7c45c33e4813a039a8de0a7a1bae [2019-11-20 01:48:51,851 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-20 01:48:51,852 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2019-11-20 01:48:51,853 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-20 01:48:51,853 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-20 01:48:51,857 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-20 01:48:51,858 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 01:48:51" (1/1) ... [2019-11-20 01:48:51,861 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2b3c7c74 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 01:48:51, skipping insertion in model container [2019-11-20 01:48:51,861 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 01:48:51" (1/1) ... [2019-11-20 01:48:51,869 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-20 01:48:51,888 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-20 01:48:52,063 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-20 01:48:52,067 INFO L188 MainTranslator]: Completed pre-run [2019-11-20 01:48:52,161 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-20 01:48:52,187 INFO L192 MainTranslator]: Completed translation [2019-11-20 01:48:52,188 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 01:48:52 WrapperNode [2019-11-20 01:48:52,188 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-20 01:48:52,189 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-11-20 01:48:52,189 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-11-20 01:48:52,189 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2019-11-20 01:48:52,199 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 01:48:52" (1/1) ... [2019-11-20 01:48:52,204 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 01:48:52" (1/1) ... [2019-11-20 01:48:52,223 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-11-20 01:48:52,223 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-20 01:48:52,224 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-20 01:48:52,224 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-20 01:48:52,232 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 01:48:52" (1/1) ... [2019-11-20 01:48:52,232 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 01:48:52" (1/1) ... [2019-11-20 01:48:52,233 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 01:48:52" (1/1) ... [2019-11-20 01:48:52,233 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 01:48:52" (1/1) ... [2019-11-20 01:48:52,235 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 01:48:52" (1/1) ... [2019-11-20 01:48:52,240 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 01:48:52" (1/1) ... [2019-11-20 01:48:52,241 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 01:48:52" (1/1) ... [2019-11-20 01:48:52,243 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-20 01:48:52,244 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-20 01:48:52,244 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-20 01:48:52,244 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-20 01:48:52,245 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 01:48:52" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_d44e825e-d41d-4925-8b2a-c495b1cea185/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 [2019-11-20 01:48:52,320 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-20 01:48:52,321 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-20 01:48:52,676 INFO L280 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-20 01:48:52,677 INFO L285 CfgBuilder]: Removed 11 assume(true) statements. [2019-11-20 01:48:52,678 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 01:48:52 BoogieIcfgContainer [2019-11-20 01:48:52,678 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-20 01:48:52,679 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-20 01:48:52,680 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-20 01:48:52,685 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-20 01:48:52,685 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.11 01:48:51" (1/3) ... [2019-11-20 01:48:52,686 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@71c2315a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 01:48:52, skipping insertion in model container [2019-11-20 01:48:52,687 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 01:48:52" (2/3) ... [2019-11-20 01:48:52,687 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@71c2315a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 01:48:52, skipping insertion in model container [2019-11-20 01:48:52,687 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 01:48:52" (3/3) ... [2019-11-20 01:48:52,693 INFO L109 eAbstractionObserver]: Analyzing ICFG for_bounded_loop1.c [2019-11-20 01:48:52,702 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-20 01:48:52,708 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 3 error locations. [2019-11-20 01:48:52,719 INFO L249 AbstractCegarLoop]: Starting to check reachability of 3 error locations. [2019-11-20 01:48:52,742 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-20 01:48:52,742 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-20 01:48:52,742 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-20 01:48:52,742 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-20 01:48:52,743 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-20 01:48:52,743 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-20 01:48:52,743 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-20 01:48:52,743 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-20 01:48:52,760 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2019-11-20 01:48:52,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2019-11-20 01:48:52,766 INFO L402 BasicCegarLoop]: Found error trace [2019-11-20 01:48:52,767 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2019-11-20 01:48:52,767 INFO L410 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-20 01:48:52,772 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-20 01:48:52,773 INFO L82 PathProgramCache]: Analyzing trace with hash 29745418, now seen corresponding path program 1 times [2019-11-20 01:48:52,780 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-20 01:48:52,781 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [490205928] [2019-11-20 01:48:52,781 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-20 01:48:52,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-20 01:48:52,974 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-20 01:48:52,975 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [490205928] [2019-11-20 01:48:52,976 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-20 01:48:52,976 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-20 01:48:52,978 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1764089325] [2019-11-20 01:48:52,984 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-20 01:48:52,984 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-20 01:48:52,996 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-20 01:48:52,997 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-11-20 01:48:52,999 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 4 states. [2019-11-20 01:48:53,110 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-20 01:48:53,110 INFO L93 Difference]: Finished difference Result 48 states and 61 transitions. [2019-11-20 01:48:53,111 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-11-20 01:48:53,112 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 5 [2019-11-20 01:48:53,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-20 01:48:53,122 INFO L225 Difference]: With dead ends: 48 [2019-11-20 01:48:53,123 INFO L226 Difference]: Without dead ends: 22 [2019-11-20 01:48:53,126 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 [2019-11-20 01:48:53,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2019-11-20 01:48:53,155 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 18. [2019-11-20 01:48:53,157 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2019-11-20 01:48:53,158 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2019-11-20 01:48:53,160 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 5 [2019-11-20 01:48:53,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-20 01:48:53,160 INFO L462 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2019-11-20 01:48:53,160 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-20 01:48:53,160 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2019-11-20 01:48:53,161 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2019-11-20 01:48:53,161 INFO L402 BasicCegarLoop]: Found error trace [2019-11-20 01:48:53,161 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2019-11-20 01:48:53,162 INFO L410 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-20 01:48:53,162 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-20 01:48:53,162 INFO L82 PathProgramCache]: Analyzing trace with hash 922077226, now seen corresponding path program 1 times [2019-11-20 01:48:53,162 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-20 01:48:53,163 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [906418441] [2019-11-20 01:48:53,163 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-20 01:48:53,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-20 01:48:53,185 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-20 01:48:53,185 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [906418441] [2019-11-20 01:48:53,186 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-20 01:48:53,186 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-20 01:48:53,186 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1932742803] [2019-11-20 01:48:53,188 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-20 01:48:53,188 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-20 01:48:53,188 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-20 01:48:53,189 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-20 01:48:53,189 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 3 states. [2019-11-20 01:48:53,208 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-20 01:48:53,209 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2019-11-20 01:48:53,209 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-20 01:48:53,210 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 6 [2019-11-20 01:48:53,210 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-20 01:48:53,210 INFO L225 Difference]: With dead ends: 22 [2019-11-20 01:48:53,210 INFO L226 Difference]: Without dead ends: 18 [2019-11-20 01:48:53,212 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 [2019-11-20 01:48:53,212 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2019-11-20 01:48:53,216 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2019-11-20 01:48:53,216 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2019-11-20 01:48:53,217 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2019-11-20 01:48:53,217 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 6 [2019-11-20 01:48:53,217 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-20 01:48:53,217 INFO L462 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2019-11-20 01:48:53,217 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-20 01:48:53,218 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2019-11-20 01:48:53,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2019-11-20 01:48:53,219 INFO L402 BasicCegarLoop]: Found error trace [2019-11-20 01:48:53,219 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2019-11-20 01:48:53,219 INFO L410 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-20 01:48:53,220 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-20 01:48:53,220 INFO L82 PathProgramCache]: Analyzing trace with hash 1387310901, now seen corresponding path program 1 times [2019-11-20 01:48:53,220 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-20 01:48:53,221 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [39014396] [2019-11-20 01:48:53,221 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-20 01:48:53,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-20 01:48:53,432 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-20 01:48:53,432 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [39014396] [2019-11-20 01:48:53,433 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-20 01:48:53,433 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-11-20 01:48:53,433 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2026565713] [2019-11-20 01:48:53,434 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-11-20 01:48:53,434 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-20 01:48:53,434 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-11-20 01:48:53,435 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2019-11-20 01:48:53,435 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 6 states. [2019-11-20 01:48:53,592 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-20 01:48:53,593 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2019-11-20 01:48:53,593 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-11-20 01:48:53,593 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 8 [2019-11-20 01:48:53,594 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-20 01:48:53,594 INFO L225 Difference]: With dead ends: 19 [2019-11-20 01:48:53,594 INFO L226 Difference]: Without dead ends: 15 [2019-11-20 01:48:53,595 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 [2019-11-20 01:48:53,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2019-11-20 01:48:53,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 13. [2019-11-20 01:48:53,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2019-11-20 01:48:53,599 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2019-11-20 01:48:53,600 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 8 [2019-11-20 01:48:53,600 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-20 01:48:53,600 INFO L462 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2019-11-20 01:48:53,600 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-11-20 01:48:53,600 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2019-11-20 01:48:53,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2019-11-20 01:48:53,601 INFO L402 BasicCegarLoop]: Found error trace [2019-11-20 01:48:53,601 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-20 01:48:53,601 INFO L410 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr2ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-20 01:48:53,602 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-20 01:48:53,602 INFO L82 PathProgramCache]: Analyzing trace with hash 681382811, now seen corresponding path program 1 times [2019-11-20 01:48:53,602 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-20 01:48:53,602 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [374293219] [2019-11-20 01:48:53,603 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-20 01:48:53,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-11-20 01:48:53,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-11-20 01:48:53,705 INFO L174 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2019-11-20 01:48:53,705 INFO L475 BasicCegarLoop]: Counterexample might be feasible [2019-11-20 01:48:53,725 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.11 01:48:53 BoogieIcfgContainer [2019-11-20 01:48:53,725 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2019-11-20 01:48:53,725 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2019-11-20 01:48:53,726 INFO L271 PluginConnector]: Initializing Witness Printer... [2019-11-20 01:48:53,726 INFO L275 PluginConnector]: Witness Printer initialized [2019-11-20 01:48:53,726 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 01:48:52" (3/4) ... [2019-11-20 01:48:53,729 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2019-11-20 01:48:53,776 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_d44e825e-d41d-4925-8b2a-c495b1cea185/bin/uautomizer/witness.graphml [2019-11-20 01:48:53,777 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2019-11-20 01:48:53,779 INFO L168 Benchmark]: Toolchain (without parser) took 1926.00 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 159.4 MB). Free memory was 951.5 MB in the beginning and 1.1 GB in the end (delta: -124.7 MB). Peak memory consumption was 34.7 MB. Max. memory is 11.5 GB. [2019-11-20 01:48:53,780 INFO L168 Benchmark]: CDTParser took 0.28 ms. Allocated memory is still 1.0 GB. Free memory is still 967.6 MB. There was no memory consumed. Max. memory is 11.5 GB. [2019-11-20 01:48:53,781 INFO L168 Benchmark]: CACSL2BoogieTranslator took 335.19 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 159.4 MB). Free memory was 951.5 MB in the beginning and 1.2 GB in the end (delta: -202.9 MB). Peak memory consumption was 23.3 MB. Max. memory is 11.5 GB. [2019-11-20 01:48:53,781 INFO L168 Benchmark]: Boogie Procedure Inliner took 34.50 ms. Allocated memory is still 1.2 GB. Free memory is still 1.2 GB. There was no memory consumed. Max. memory is 11.5 GB. [2019-11-20 01:48:53,782 INFO L168 Benchmark]: Boogie Preprocessor took 19.95 ms. Allocated memory is still 1.2 GB. Free memory is still 1.2 GB. There was no memory consumed. Max. memory is 11.5 GB. [2019-11-20 01:48:53,783 INFO L168 Benchmark]: RCFGBuilder took 434.81 ms. Allocated memory is still 1.2 GB. Free memory was 1.2 GB in the beginning and 1.1 GB in the end (delta: 25.7 MB). Peak memory consumption was 25.7 MB. Max. memory is 11.5 GB. [2019-11-20 01:48:53,783 INFO L168 Benchmark]: TraceAbstraction took 1045.71 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: 52.5 MB). Peak memory consumption was 52.5 MB. Max. memory is 11.5 GB. [2019-11-20 01:48:53,784 INFO L168 Benchmark]: Witness Printer took 51.35 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. [2019-11-20 01:48:53,788 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.28 ms. Allocated memory is still 1.0 GB. Free memory is still 967.6 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 335.19 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 159.4 MB). Free memory was 951.5 MB in the beginning and 1.2 GB in the end (delta: -202.9 MB). Peak memory consumption was 23.3 MB. Max. memory is 11.5 GB. * Boogie Procedure Inliner took 34.50 ms. Allocated memory is still 1.2 GB. Free memory is still 1.2 GB. There was no memory consumed. Max. memory is 11.5 GB. * Boogie Preprocessor took 19.95 ms. Allocated memory is still 1.2 GB. Free memory is still 1.2 GB. There was no memory consumed. Max. memory is 11.5 GB. * RCFGBuilder took 434.81 ms. Allocated memory is still 1.2 GB. Free memory was 1.2 GB in the beginning and 1.1 GB in the end (delta: 25.7 MB). Peak memory consumption was 25.7 MB. Max. memory is 11.5 GB. * TraceAbstraction took 1045.71 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: 52.5 MB). Peak memory consumption was 52.5 MB. Max. memory is 11.5 GB. * Witness Printer took 51.35 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. * 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