./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-fpi/s1iff.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_f68c1647-8d19-499f-8ea4-50c8ea0890b8/bin/uautomizer/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/run_dir_f68c1647-8d19-499f-8ea4-50c8ea0890b8/bin/uautomizer/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_f68c1647-8d19-499f-8ea4-50c8ea0890b8/bin/uautomizer/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_f68c1647-8d19-499f-8ea4-50c8ea0890b8/bin/uautomizer/config/AutomizerReach.xml -i ../../sv-benchmarks/c/array-fpi/s1iff.c -s /tmp/vcloud-vcloud-master/worker/run_dir_f68c1647-8d19-499f-8ea4-50c8ea0890b8/bin/uautomizer/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_f68c1647-8d19-499f-8ea4-50c8ea0890b8/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 f327e5a5b021f775646fced96474c3f2382bd51e .......................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... 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 [2019-11-19 22:02:11,697 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-19 22:02:11,699 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-19 22:02:11,713 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-19 22:02:11,714 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-19 22:02:11,715 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-19 22:02:11,717 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-19 22:02:11,725 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-19 22:02:11,729 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-19 22:02:11,733 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-19 22:02:11,734 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-19 22:02:11,735 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-19 22:02:11,735 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-19 22:02:11,737 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-19 22:02:11,738 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-19 22:02:11,739 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-19 22:02:11,740 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-19 22:02:11,741 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-19 22:02:11,743 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-19 22:02:11,746 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-19 22:02:11,750 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-19 22:02:11,751 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-19 22:02:11,754 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-19 22:02:11,754 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-19 22:02:11,757 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-11-19 22:02:11,757 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-11-19 22:02:11,757 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-11-19 22:02:11,759 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-11-19 22:02:11,759 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-11-19 22:02:11,760 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-11-19 22:02:11,760 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-11-19 22:02:11,761 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-11-19 22:02:11,761 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-11-19 22:02:11,762 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-11-19 22:02:11,763 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-11-19 22:02:11,763 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-11-19 22:02:11,764 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-11-19 22:02:11,764 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-11-19 22:02:11,764 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-19 22:02:11,765 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-19 22:02:11,766 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-19 22:02:11,766 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_f68c1647-8d19-499f-8ea4-50c8ea0890b8/bin/uautomizer/config/svcomp-Reach-32bit-Automizer_Default.epf [2019-11-19 22:02:11,790 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-19 22:02:11,791 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-19 22:02:11,791 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-19 22:02:11,792 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-19 22:02:11,792 INFO L138 SettingsManager]: * Use SBE=true [2019-11-19 22:02:11,792 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-19 22:02:11,792 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-19 22:02:11,792 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-19 22:02:11,793 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-19 22:02:11,793 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-19 22:02:11,793 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-19 22:02:11,793 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-19 22:02:11,793 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-19 22:02:11,793 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-19 22:02:11,794 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-19 22:02:11,794 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-19 22:02:11,794 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-19 22:02:11,794 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-19 22:02:11,794 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-19 22:02:11,794 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-19 22:02:11,795 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-19 22:02:11,795 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-19 22:02:11,795 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-19 22:02:11,795 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-19 22:02:11,795 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-19 22:02:11,796 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-19 22:02:11,796 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-19 22:02:11,796 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-19 22:02:11,796 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_f68c1647-8d19-499f-8ea4-50c8ea0890b8/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 -> f327e5a5b021f775646fced96474c3f2382bd51e [2019-11-19 22:02:11,956 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-19 22:02:11,966 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-19 22:02:11,969 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-19 22:02:11,970 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-19 22:02:11,970 INFO L275 PluginConnector]: CDTParser initialized [2019-11-19 22:02:11,971 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_f68c1647-8d19-499f-8ea4-50c8ea0890b8/bin/uautomizer/../../sv-benchmarks/c/array-fpi/s1iff.c [2019-11-19 22:02:12,022 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_f68c1647-8d19-499f-8ea4-50c8ea0890b8/bin/uautomizer/data/4c65a9853/3dd789750a3047b3b68058358e5fda02/FLAG2131d1096 [2019-11-19 22:02:12,377 INFO L306 CDTParser]: Found 1 translation units. [2019-11-19 22:02:12,377 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_f68c1647-8d19-499f-8ea4-50c8ea0890b8/sv-benchmarks/c/array-fpi/s1iff.c [2019-11-19 22:02:12,382 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_f68c1647-8d19-499f-8ea4-50c8ea0890b8/bin/uautomizer/data/4c65a9853/3dd789750a3047b3b68058358e5fda02/FLAG2131d1096 [2019-11-19 22:02:12,394 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_f68c1647-8d19-499f-8ea4-50c8ea0890b8/bin/uautomizer/data/4c65a9853/3dd789750a3047b3b68058358e5fda02 [2019-11-19 22:02:12,397 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-19 22:02:12,398 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2019-11-19 22:02:12,399 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-19 22:02:12,399 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-19 22:02:12,404 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-19 22:02:12,405 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 10:02:12" (1/1) ... [2019-11-19 22:02:12,407 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7814d67a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 10:02:12, skipping insertion in model container [2019-11-19 22:02:12,408 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 10:02:12" (1/1) ... [2019-11-19 22:02:12,414 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-19 22:02:12,431 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-19 22:02:12,573 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-19 22:02:12,645 INFO L188 MainTranslator]: Completed pre-run [2019-11-19 22:02:12,665 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-19 22:02:12,679 INFO L192 MainTranslator]: Completed translation [2019-11-19 22:02:12,679 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 10:02:12 WrapperNode [2019-11-19 22:02:12,680 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-19 22:02:12,680 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-11-19 22:02:12,681 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-11-19 22:02:12,681 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2019-11-19 22:02:12,688 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 10:02:12" (1/1) ... [2019-11-19 22:02:12,695 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 10:02:12" (1/1) ... [2019-11-19 22:02:12,714 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-11-19 22:02:12,714 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-19 22:02:12,714 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-19 22:02:12,714 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-19 22:02:12,723 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 10:02:12" (1/1) ... [2019-11-19 22:02:12,723 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 10:02:12" (1/1) ... [2019-11-19 22:02:12,725 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 10:02:12" (1/1) ... [2019-11-19 22:02:12,725 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 10:02:12" (1/1) ... [2019-11-19 22:02:12,730 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 10:02:12" (1/1) ... [2019-11-19 22:02:12,735 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 10:02:12" (1/1) ... [2019-11-19 22:02:12,736 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 10:02:12" (1/1) ... [2019-11-19 22:02:12,738 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-19 22:02:12,738 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-19 22:02:12,738 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-19 22:02:12,739 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-19 22:02:12,739 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 10:02:12" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_f68c1647-8d19-499f-8ea4-50c8ea0890b8/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 [2019-11-19 22:02:12,799 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-11-19 22:02:12,800 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-11-19 22:02:12,800 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2019-11-19 22:02:12,800 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-19 22:02:12,801 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-19 22:02:12,801 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-11-19 22:02:12,802 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-19 22:02:13,135 INFO L280 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-19 22:02:13,136 INFO L285 CfgBuilder]: Removed 8 assume(true) statements. [2019-11-19 22:02:13,137 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 10:02:13 BoogieIcfgContainer [2019-11-19 22:02:13,137 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-19 22:02:13,138 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-19 22:02:13,138 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-19 22:02:13,141 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-19 22:02:13,141 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 10:02:12" (1/3) ... [2019-11-19 22:02:13,142 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@32f65f5f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 10:02:13, skipping insertion in model container [2019-11-19 22:02:13,142 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 10:02:12" (2/3) ... [2019-11-19 22:02:13,142 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@32f65f5f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 10:02:13, skipping insertion in model container [2019-11-19 22:02:13,143 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 10:02:13" (3/3) ... [2019-11-19 22:02:13,144 INFO L109 eAbstractionObserver]: Analyzing ICFG s1iff.c [2019-11-19 22:02:13,153 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-19 22:02:13,165 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-19 22:02:13,183 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-19 22:02:13,203 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-19 22:02:13,203 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-19 22:02:13,203 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-19 22:02:13,203 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-19 22:02:13,207 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-19 22:02:13,207 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-19 22:02:13,208 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-19 22:02:13,208 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-19 22:02:13,223 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2019-11-19 22:02:13,229 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2019-11-19 22:02:13,229 INFO L402 BasicCegarLoop]: Found error trace [2019-11-19 22:02:13,230 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-19 22:02:13,230 INFO L410 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-19 22:02:13,234 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-19 22:02:13,234 INFO L82 PathProgramCache]: Analyzing trace with hash 1476218026, now seen corresponding path program 1 times [2019-11-19 22:02:13,240 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-19 22:02:13,241 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [779264117] [2019-11-19 22:02:13,241 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-19 22:02:13,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-19 22:02:13,349 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-19 22:02:13,349 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [779264117] [2019-11-19 22:02:13,350 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-19 22:02:13,350 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-11-19 22:02:13,351 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [958397765] [2019-11-19 22:02:13,355 INFO L442 AbstractCegarLoop]: Interpolant automaton has 2 states [2019-11-19 22:02:13,356 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-19 22:02:13,365 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2019-11-19 22:02:13,366 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-11-19 22:02:13,367 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 2 states. [2019-11-19 22:02:13,381 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-19 22:02:13,381 INFO L93 Difference]: Finished difference Result 29 states and 38 transitions. [2019-11-19 22:02:13,381 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2019-11-19 22:02:13,382 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 9 [2019-11-19 22:02:13,382 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-19 22:02:13,388 INFO L225 Difference]: With dead ends: 29 [2019-11-19 22:02:13,388 INFO L226 Difference]: Without dead ends: 13 [2019-11-19 22:02:13,390 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-11-19 22:02:13,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2019-11-19 22:02:13,413 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2019-11-19 22:02:13,414 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2019-11-19 22:02:13,414 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 15 transitions. [2019-11-19 22:02:13,415 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 15 transitions. Word has length 9 [2019-11-19 22:02:13,416 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-19 22:02:13,416 INFO L462 AbstractCegarLoop]: Abstraction has 13 states and 15 transitions. [2019-11-19 22:02:13,416 INFO L463 AbstractCegarLoop]: Interpolant automaton has 2 states. [2019-11-19 22:02:13,416 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 15 transitions. [2019-11-19 22:02:13,417 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2019-11-19 22:02:13,417 INFO L402 BasicCegarLoop]: Found error trace [2019-11-19 22:02:13,417 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-19 22:02:13,417 INFO L410 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-19 22:02:13,417 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-19 22:02:13,418 INFO L82 PathProgramCache]: Analyzing trace with hash 1304115419, now seen corresponding path program 1 times [2019-11-19 22:02:13,418 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-19 22:02:13,418 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [725167947] [2019-11-19 22:02:13,418 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-19 22:02:13,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-19 22:02:13,480 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-19 22:02:13,480 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [725167947] [2019-11-19 22:02:13,480 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-19 22:02:13,480 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-19 22:02:13,481 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1581462216] [2019-11-19 22:02:13,482 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-19 22:02:13,482 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-19 22:02:13,482 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-19 22:02:13,483 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-19 22:02:13,483 INFO L87 Difference]: Start difference. First operand 13 states and 15 transitions. Second operand 3 states. [2019-11-19 22:02:13,527 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-19 22:02:13,527 INFO L93 Difference]: Finished difference Result 23 states and 27 transitions. [2019-11-19 22:02:13,528 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-19 22:02:13,528 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 9 [2019-11-19 22:02:13,528 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-19 22:02:13,529 INFO L225 Difference]: With dead ends: 23 [2019-11-19 22:02:13,529 INFO L226 Difference]: Without dead ends: 15 [2019-11-19 22:02:13,530 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 [2019-11-19 22:02:13,530 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2019-11-19 22:02:13,532 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 14. [2019-11-19 22:02:13,533 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2019-11-19 22:02:13,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2019-11-19 22:02:13,533 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 9 [2019-11-19 22:02:13,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-19 22:02:13,534 INFO L462 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2019-11-19 22:02:13,534 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-19 22:02:13,534 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2019-11-19 22:02:13,534 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2019-11-19 22:02:13,535 INFO L402 BasicCegarLoop]: Found error trace [2019-11-19 22:02:13,535 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-19 22:02:13,535 INFO L410 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-19 22:02:13,535 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-19 22:02:13,535 INFO L82 PathProgramCache]: Analyzing trace with hash -1358761923, now seen corresponding path program 1 times [2019-11-19 22:02:13,536 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-19 22:02:13,536 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [793721627] [2019-11-19 22:02:13,536 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-19 22:02:13,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-19 22:02:13,594 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-19 22:02:13,594 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [793721627] [2019-11-19 22:02:13,595 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-19 22:02:13,595 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-11-19 22:02:13,595 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [163528011] [2019-11-19 22:02:13,595 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-19 22:02:13,596 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-19 22:02:13,596 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-19 22:02:13,596 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-11-19 22:02:13,596 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand 4 states. [2019-11-19 22:02:13,660 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-19 22:02:13,660 INFO L93 Difference]: Finished difference Result 22 states and 25 transitions. [2019-11-19 22:02:13,661 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-19 22:02:13,661 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 11 [2019-11-19 22:02:13,661 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-19 22:02:13,661 INFO L225 Difference]: With dead ends: 22 [2019-11-19 22:02:13,662 INFO L226 Difference]: Without dead ends: 18 [2019-11-19 22:02:13,662 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-11-19 22:02:13,662 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2019-11-19 22:02:13,665 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 15. [2019-11-19 22:02:13,665 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2019-11-19 22:02:13,665 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2019-11-19 22:02:13,666 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 11 [2019-11-19 22:02:13,666 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-19 22:02:13,666 INFO L462 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2019-11-19 22:02:13,666 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-19 22:02:13,666 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2019-11-19 22:02:13,667 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-11-19 22:02:13,667 INFO L402 BasicCegarLoop]: Found error trace [2019-11-19 22:02:13,667 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-19 22:02:13,667 INFO L410 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-19 22:02:13,667 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-19 22:02:13,668 INFO L82 PathProgramCache]: Analyzing trace with hash -1565637502, now seen corresponding path program 1 times [2019-11-19 22:02:13,668 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-19 22:02:13,668 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [456514253] [2019-11-19 22:02:13,668 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-19 22:02:13,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-19 22:02:14,150 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-19 22:02:14,150 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [456514253] [2019-11-19 22:02:14,151 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1025725746] [2019-11-19 22:02:14,151 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_f68c1647-8d19-499f-8ea4-50c8ea0890b8/bin/uautomizer/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-19 22:02:14,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-19 22:02:14,203 INFO L255 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 24 conjunts are in the unsatisfiable core [2019-11-19 22:02:14,208 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-19 22:02:14,289 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2019-11-19 22:02:14,289 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-19 22:02:14,302 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-19 22:02:14,312 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2019-11-19 22:02:14,312 INFO L496 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2019-11-19 22:02:14,323 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-19 22:02:14,324 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-11-19 22:02:14,324 INFO L221 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:30, output treesize:22 [2019-11-19 22:02:14,365 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 22 [2019-11-19 22:02:14,366 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-19 22:02:14,381 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-19 22:02:14,382 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-11-19 22:02:14,382 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:36, output treesize:32 [2019-11-19 22:02:14,582 INFO L343 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2019-11-19 22:02:14,583 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 55 treesize of output 57 [2019-11-19 22:02:14,584 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-19 22:02:14,631 INFO L567 ElimStorePlain]: treesize reduction 24, result has 69.6 percent of original size [2019-11-19 22:02:14,633 INFO L496 ElimStorePlain]: Start of recursive call 1: 4 dim-0 vars, 1 dim-2 vars, End of recursive call: 4 dim-0 vars, and 1 xjuncts. [2019-11-19 22:02:14,633 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 5 variables, input treesize:70, output treesize:55 [2019-11-19 22:02:14,693 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-19 22:02:14,723 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-19 22:02:14,723 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-19 22:02:14,724 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 16 [2019-11-19 22:02:14,724 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1499029413] [2019-11-19 22:02:14,724 INFO L442 AbstractCegarLoop]: Interpolant automaton has 16 states [2019-11-19 22:02:14,724 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-19 22:02:14,725 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2019-11-19 22:02:14,725 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=195, Unknown=0, NotChecked=0, Total=240 [2019-11-19 22:02:14,725 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 16 states. [2019-11-19 22:02:15,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-19 22:02:15,223 INFO L93 Difference]: Finished difference Result 33 states and 40 transitions. [2019-11-19 22:02:15,224 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-11-19 22:02:15,224 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 14 [2019-11-19 22:02:15,225 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-19 22:02:15,226 INFO L225 Difference]: With dead ends: 33 [2019-11-19 22:02:15,226 INFO L226 Difference]: Without dead ends: 24 [2019-11-19 22:02:15,227 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 84 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=101, Invalid=361, Unknown=0, NotChecked=0, Total=462 [2019-11-19 22:02:15,228 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2019-11-19 22:02:15,232 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 21. [2019-11-19 22:02:15,252 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2019-11-19 22:02:15,253 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 24 transitions. [2019-11-19 22:02:15,253 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 24 transitions. Word has length 14 [2019-11-19 22:02:15,254 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-19 22:02:15,254 INFO L462 AbstractCegarLoop]: Abstraction has 21 states and 24 transitions. [2019-11-19 22:02:15,254 INFO L463 AbstractCegarLoop]: Interpolant automaton has 16 states. [2019-11-19 22:02:15,254 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 24 transitions. [2019-11-19 22:02:15,255 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-11-19 22:02:15,255 INFO L402 BasicCegarLoop]: Found error trace [2019-11-19 22:02:15,255 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-19 22:02:15,456 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-19 22:02:15,456 INFO L410 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-19 22:02:15,456 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-19 22:02:15,457 INFO L82 PathProgramCache]: Analyzing trace with hash -472130976, now seen corresponding path program 2 times [2019-11-19 22:02:15,457 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-19 22:02:15,457 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [630263402] [2019-11-19 22:02:15,457 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-19 22:02:15,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-19 22:02:15,569 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-19 22:02:15,569 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [630263402] [2019-11-19 22:02:15,569 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [157372877] [2019-11-19 22:02:15,570 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_f68c1647-8d19-499f-8ea4-50c8ea0890b8/bin/uautomizer/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-19 22:02:15,627 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-19 22:02:15,627 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-19 22:02:15,628 INFO L255 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-19 22:02:15,629 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-19 22:02:15,680 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-19 22:02:15,680 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-19 22:02:15,681 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2019-11-19 22:02:15,681 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1082666875] [2019-11-19 22:02:15,681 INFO L442 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-11-19 22:02:15,682 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-19 22:02:15,682 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-11-19 22:02:15,682 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2019-11-19 22:02:15,682 INFO L87 Difference]: Start difference. First operand 21 states and 24 transitions. Second operand 10 states. [2019-11-19 22:02:15,841 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-19 22:02:15,842 INFO L93 Difference]: Finished difference Result 31 states and 36 transitions. [2019-11-19 22:02:15,842 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-11-19 22:02:15,842 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 16 [2019-11-19 22:02:15,842 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-19 22:02:15,843 INFO L225 Difference]: With dead ends: 31 [2019-11-19 22:02:15,843 INFO L226 Difference]: Without dead ends: 27 [2019-11-19 22:02:15,843 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=57, Invalid=125, Unknown=0, NotChecked=0, Total=182 [2019-11-19 22:02:15,844 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2019-11-19 22:02:15,848 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 23. [2019-11-19 22:02:15,848 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2019-11-19 22:02:15,849 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 27 transitions. [2019-11-19 22:02:15,849 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 27 transitions. Word has length 16 [2019-11-19 22:02:15,849 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-19 22:02:15,850 INFO L462 AbstractCegarLoop]: Abstraction has 23 states and 27 transitions. [2019-11-19 22:02:15,850 INFO L463 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-11-19 22:02:15,850 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 27 transitions. [2019-11-19 22:02:15,850 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-11-19 22:02:15,850 INFO L402 BasicCegarLoop]: Found error trace [2019-11-19 22:02:15,851 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-19 22:02:16,054 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-19 22:02:16,054 INFO L410 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-19 22:02:16,054 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-19 22:02:16,054 INFO L82 PathProgramCache]: Analyzing trace with hash -1317941731, now seen corresponding path program 3 times [2019-11-19 22:02:16,055 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-19 22:02:16,055 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1859677992] [2019-11-19 22:02:16,055 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-19 22:02:16,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-19 22:02:16,163 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-19 22:02:16,164 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1859677992] [2019-11-19 22:02:16,164 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1559319583] [2019-11-19 22:02:16,164 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_f68c1647-8d19-499f-8ea4-50c8ea0890b8/bin/uautomizer/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-19 22:02:16,230 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-11-19 22:02:16,230 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-19 22:02:16,231 INFO L255 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-19 22:02:16,232 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-19 22:02:16,281 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-19 22:02:16,281 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-19 22:02:16,281 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2019-11-19 22:02:16,281 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1312898508] [2019-11-19 22:02:16,282 INFO L442 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-11-19 22:02:16,282 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-19 22:02:16,282 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-11-19 22:02:16,282 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2019-11-19 22:02:16,283 INFO L87 Difference]: Start difference. First operand 23 states and 27 transitions. Second operand 10 states. [2019-11-19 22:02:16,388 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-19 22:02:16,389 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2019-11-19 22:02:16,390 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-11-19 22:02:16,390 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 17 [2019-11-19 22:02:16,390 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-19 22:02:16,390 INFO L225 Difference]: With dead ends: 35 [2019-11-19 22:02:16,391 INFO L226 Difference]: Without dead ends: 23 [2019-11-19 22:02:16,391 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2019-11-19 22:02:16,391 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2019-11-19 22:02:16,394 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 20. [2019-11-19 22:02:16,394 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2019-11-19 22:02:16,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 23 transitions. [2019-11-19 22:02:16,395 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 23 transitions. Word has length 17 [2019-11-19 22:02:16,395 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-19 22:02:16,395 INFO L462 AbstractCegarLoop]: Abstraction has 20 states and 23 transitions. [2019-11-19 22:02:16,395 INFO L463 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-11-19 22:02:16,395 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 23 transitions. [2019-11-19 22:02:16,396 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2019-11-19 22:02:16,398 INFO L402 BasicCegarLoop]: Found error trace [2019-11-19 22:02:16,398 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-19 22:02:16,601 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-19 22:02:16,601 INFO L410 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-19 22:02:16,601 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-19 22:02:16,602 INFO L82 PathProgramCache]: Analyzing trace with hash -1991965825, now seen corresponding path program 4 times [2019-11-19 22:02:16,602 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-19 22:02:16,602 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1106590022] [2019-11-19 22:02:16,602 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-19 22:02:16,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-11-19 22:02:16,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-11-19 22:02:16,658 INFO L174 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2019-11-19 22:02:16,659 INFO L475 BasicCegarLoop]: Counterexample might be feasible [2019-11-19 22:02:16,688 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 19.11 10:02:16 BoogieIcfgContainer [2019-11-19 22:02:16,689 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2019-11-19 22:02:16,689 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2019-11-19 22:02:16,689 INFO L271 PluginConnector]: Initializing Witness Printer... [2019-11-19 22:02:16,689 INFO L275 PluginConnector]: Witness Printer initialized [2019-11-19 22:02:16,690 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 10:02:13" (3/4) ... [2019-11-19 22:02:16,692 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2019-11-19 22:02:16,736 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_f68c1647-8d19-499f-8ea4-50c8ea0890b8/bin/uautomizer/witness.graphml [2019-11-19 22:02:16,736 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2019-11-19 22:02:16,738 INFO L168 Benchmark]: Toolchain (without parser) took 4339.63 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 155.2 MB). Free memory was 946.1 MB in the beginning and 1.1 GB in the end (delta: -163.7 MB). There was no memory consumed. Max. memory is 11.5 GB. [2019-11-19 22:02:16,738 INFO L168 Benchmark]: CDTParser took 0.22 ms. Allocated memory is still 1.0 GB. Free memory is still 962.2 MB. There was no memory consumed. Max. memory is 11.5 GB. [2019-11-19 22:02:16,739 INFO L168 Benchmark]: CACSL2BoogieTranslator took 280.99 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 155.2 MB). Free memory was 946.1 MB in the beginning and 1.1 GB in the end (delta: -203.9 MB). Peak memory consumption was 23.2 MB. Max. memory is 11.5 GB. [2019-11-19 22:02:16,739 INFO L168 Benchmark]: Boogie Procedure Inliner took 33.46 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. [2019-11-19 22:02:16,739 INFO L168 Benchmark]: Boogie Preprocessor took 23.97 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. [2019-11-19 22:02:16,739 INFO L168 Benchmark]: RCFGBuilder took 398.87 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. [2019-11-19 22:02:16,740 INFO L168 Benchmark]: TraceAbstraction took 3550.88 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: 14.7 MB). Peak memory consumption was 14.7 MB. Max. memory is 11.5 GB. [2019-11-19 22:02:16,740 INFO L168 Benchmark]: Witness Printer took 47.54 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: 1.7 MB). Peak memory consumption was 1.7 MB. Max. memory is 11.5 GB. [2019-11-19 22:02:16,742 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.22 ms. Allocated memory is still 1.0 GB. Free memory is still 962.2 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 280.99 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 155.2 MB). Free memory was 946.1 MB in the beginning and 1.1 GB in the end (delta: -203.9 MB). Peak memory consumption was 23.2 MB. Max. memory is 11.5 GB. * Boogie Procedure Inliner took 33.46 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 23.97 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 398.87 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 3550.88 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: 14.7 MB). Peak memory consumption was 14.7 MB. Max. memory is 11.5 GB. * Witness Printer took 47.54 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: 1.7 MB). Peak memory consumption was 1.7 MB. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 10]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L14] int N; VAL [N=0] [L18] N = __VERIFIER_nondet_int() [L19] COND FALSE !(N <= 0) [L22] int i; [L23] long long sum[1]; [L24] int *a = malloc(sizeof(int)*N); [L26] sum[0] = 1 [L27] i=0 VAL [N=2] [L27] COND TRUE i