./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-fpi/s4iff.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_9d2d1b2d-29f1-4bf5-83c5-0c7496199b25/bin/uautomizer/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/run_dir_9d2d1b2d-29f1-4bf5-83c5-0c7496199b25/bin/uautomizer/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_9d2d1b2d-29f1-4bf5-83c5-0c7496199b25/bin/uautomizer/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_9d2d1b2d-29f1-4bf5-83c5-0c7496199b25/bin/uautomizer/config/AutomizerReach.xml -i ../../sv-benchmarks/c/array-fpi/s4iff.c -s /tmp/vcloud-vcloud-master/worker/run_dir_9d2d1b2d-29f1-4bf5-83c5-0c7496199b25/bin/uautomizer/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_9d2d1b2d-29f1-4bf5-83c5-0c7496199b25/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 aa2dda5680f87372970e50da43a1e6c1a86bd9e2 .......................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... 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 05:11:23,088 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-20 05:11:23,090 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-20 05:11:23,101 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-20 05:11:23,102 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-20 05:11:23,103 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-20 05:11:23,104 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-20 05:11:23,107 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-20 05:11:23,109 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-20 05:11:23,110 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-20 05:11:23,111 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-20 05:11:23,113 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-20 05:11:23,113 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-20 05:11:23,114 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-20 05:11:23,115 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-20 05:11:23,117 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-20 05:11:23,117 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-20 05:11:23,118 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-20 05:11:23,121 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-20 05:11:23,123 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-20 05:11:23,125 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-20 05:11:23,126 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-20 05:11:23,127 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-20 05:11:23,128 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-20 05:11:23,131 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-11-20 05:11:23,131 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-11-20 05:11:23,132 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-11-20 05:11:23,133 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-11-20 05:11:23,133 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-11-20 05:11:23,134 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-11-20 05:11:23,134 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-11-20 05:11:23,135 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-11-20 05:11:23,136 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-11-20 05:11:23,137 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-11-20 05:11:23,138 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-11-20 05:11:23,138 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-11-20 05:11:23,139 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-11-20 05:11:23,139 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-11-20 05:11:23,139 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-20 05:11:23,140 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-20 05:11:23,141 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-20 05:11:23,142 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_9d2d1b2d-29f1-4bf5-83c5-0c7496199b25/bin/uautomizer/config/svcomp-Reach-32bit-Automizer_Default.epf [2019-11-20 05:11:23,155 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-20 05:11:23,155 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-20 05:11:23,156 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-20 05:11:23,157 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-20 05:11:23,157 INFO L138 SettingsManager]: * Use SBE=true [2019-11-20 05:11:23,157 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-20 05:11:23,157 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-20 05:11:23,158 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-20 05:11:23,158 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-20 05:11:23,158 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-20 05:11:23,158 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-20 05:11:23,158 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-20 05:11:23,159 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-20 05:11:23,159 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-20 05:11:23,159 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-20 05:11:23,159 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-20 05:11:23,159 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-20 05:11:23,160 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-20 05:11:23,160 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-20 05:11:23,160 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-20 05:11:23,160 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-20 05:11:23,161 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-20 05:11:23,161 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-20 05:11:23,161 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-20 05:11:23,161 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-20 05:11:23,162 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-20 05:11:23,162 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-20 05:11:23,162 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-20 05:11:23,162 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_9d2d1b2d-29f1-4bf5-83c5-0c7496199b25/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 -> aa2dda5680f87372970e50da43a1e6c1a86bd9e2 [2019-11-20 05:11:23,310 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-20 05:11:23,321 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-20 05:11:23,324 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-20 05:11:23,326 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-20 05:11:23,326 INFO L275 PluginConnector]: CDTParser initialized [2019-11-20 05:11:23,327 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_9d2d1b2d-29f1-4bf5-83c5-0c7496199b25/bin/uautomizer/../../sv-benchmarks/c/array-fpi/s4iff.c [2019-11-20 05:11:23,383 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_9d2d1b2d-29f1-4bf5-83c5-0c7496199b25/bin/uautomizer/data/4da089eb1/805a81b3ac7f4839b6ea402d1574aaec/FLAG0b421ff28 [2019-11-20 05:11:23,744 INFO L306 CDTParser]: Found 1 translation units. [2019-11-20 05:11:23,745 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_9d2d1b2d-29f1-4bf5-83c5-0c7496199b25/sv-benchmarks/c/array-fpi/s4iff.c [2019-11-20 05:11:23,751 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_9d2d1b2d-29f1-4bf5-83c5-0c7496199b25/bin/uautomizer/data/4da089eb1/805a81b3ac7f4839b6ea402d1574aaec/FLAG0b421ff28 [2019-11-20 05:11:24,110 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_9d2d1b2d-29f1-4bf5-83c5-0c7496199b25/bin/uautomizer/data/4da089eb1/805a81b3ac7f4839b6ea402d1574aaec [2019-11-20 05:11:24,113 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-20 05:11:24,114 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2019-11-20 05:11:24,115 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-20 05:11:24,115 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-20 05:11:24,119 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-20 05:11:24,121 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 05:11:24" (1/1) ... [2019-11-20 05:11:24,123 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7e89e589 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 05:11:24, skipping insertion in model container [2019-11-20 05:11:24,124 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 05:11:24" (1/1) ... [2019-11-20 05:11:24,130 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-20 05:11:24,143 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-20 05:11:24,299 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-20 05:11:24,308 INFO L188 MainTranslator]: Completed pre-run [2019-11-20 05:11:24,394 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-20 05:11:24,408 INFO L192 MainTranslator]: Completed translation [2019-11-20 05:11:24,409 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 05:11:24 WrapperNode [2019-11-20 05:11:24,409 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-20 05:11:24,410 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-11-20 05:11:24,410 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-11-20 05:11:24,410 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2019-11-20 05:11:24,418 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 05:11:24" (1/1) ... [2019-11-20 05:11:24,426 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 05:11:24" (1/1) ... [2019-11-20 05:11:24,445 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-11-20 05:11:24,446 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-20 05:11:24,446 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-20 05:11:24,446 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-20 05:11:24,455 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 05:11:24" (1/1) ... [2019-11-20 05:11:24,455 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 05:11:24" (1/1) ... [2019-11-20 05:11:24,457 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 05:11:24" (1/1) ... [2019-11-20 05:11:24,458 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 05:11:24" (1/1) ... [2019-11-20 05:11:24,463 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 05:11:24" (1/1) ... [2019-11-20 05:11:24,468 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 05:11:24" (1/1) ... [2019-11-20 05:11:24,470 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 05:11:24" (1/1) ... [2019-11-20 05:11:24,472 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-20 05:11:24,472 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-20 05:11:24,473 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-20 05:11:24,473 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-20 05:11:24,474 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 05:11:24" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_9d2d1b2d-29f1-4bf5-83c5-0c7496199b25/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 05:11:24,546 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-11-20 05:11:24,547 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-11-20 05:11:24,547 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2019-11-20 05:11:24,548 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-20 05:11:24,549 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-20 05:11:24,549 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-11-20 05:11:24,551 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-20 05:11:24,815 INFO L280 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-20 05:11:24,816 INFO L285 CfgBuilder]: Removed 8 assume(true) statements. [2019-11-20 05:11:24,817 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 05:11:24 BoogieIcfgContainer [2019-11-20 05:11:24,817 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-20 05:11:24,818 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-20 05:11:24,819 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-20 05:11:24,836 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-20 05:11:24,836 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.11 05:11:24" (1/3) ... [2019-11-20 05:11:24,837 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@29785dad and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 05:11:24, skipping insertion in model container [2019-11-20 05:11:24,837 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 05:11:24" (2/3) ... [2019-11-20 05:11:24,837 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@29785dad and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 05:11:24, skipping insertion in model container [2019-11-20 05:11:24,838 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 05:11:24" (3/3) ... [2019-11-20 05:11:24,839 INFO L109 eAbstractionObserver]: Analyzing ICFG s4iff.c [2019-11-20 05:11:24,848 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-20 05:11:24,870 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-20 05:11:24,882 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-20 05:11:24,907 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-20 05:11:24,908 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-20 05:11:24,908 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-20 05:11:24,908 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-20 05:11:24,908 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-20 05:11:24,908 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-20 05:11:24,908 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-20 05:11:24,909 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-20 05:11:24,922 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2019-11-20 05:11:24,928 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2019-11-20 05:11:24,929 INFO L402 BasicCegarLoop]: Found error trace [2019-11-20 05:11:24,930 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-20 05:11:24,930 INFO L410 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-20 05:11:24,936 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-20 05:11:24,936 INFO L82 PathProgramCache]: Analyzing trace with hash 1476218026, now seen corresponding path program 1 times [2019-11-20 05:11:24,946 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-20 05:11:24,947 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [936166828] [2019-11-20 05:11:24,947 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-20 05:11:25,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-20 05:11:25,116 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 05:11:25,116 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [936166828] [2019-11-20 05:11:25,118 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-20 05:11:25,118 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-11-20 05:11:25,119 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1016650866] [2019-11-20 05:11:25,124 INFO L442 AbstractCegarLoop]: Interpolant automaton has 2 states [2019-11-20 05:11:25,124 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-20 05:11:25,137 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2019-11-20 05:11:25,138 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-11-20 05:11:25,140 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 2 states. [2019-11-20 05:11:25,159 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-20 05:11:25,160 INFO L93 Difference]: Finished difference Result 29 states and 38 transitions. [2019-11-20 05:11:25,160 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2019-11-20 05:11:25,162 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 9 [2019-11-20 05:11:25,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-20 05:11:25,172 INFO L225 Difference]: With dead ends: 29 [2019-11-20 05:11:25,172 INFO L226 Difference]: Without dead ends: 13 [2019-11-20 05:11:25,176 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 [2019-11-20 05:11:25,192 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2019-11-20 05:11:25,211 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2019-11-20 05:11:25,212 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2019-11-20 05:11:25,213 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 15 transitions. [2019-11-20 05:11:25,214 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 15 transitions. Word has length 9 [2019-11-20 05:11:25,214 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-20 05:11:25,215 INFO L462 AbstractCegarLoop]: Abstraction has 13 states and 15 transitions. [2019-11-20 05:11:25,215 INFO L463 AbstractCegarLoop]: Interpolant automaton has 2 states. [2019-11-20 05:11:25,215 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 15 transitions. [2019-11-20 05:11:25,216 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2019-11-20 05:11:25,216 INFO L402 BasicCegarLoop]: Found error trace [2019-11-20 05:11:25,216 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-20 05:11:25,217 INFO L410 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-20 05:11:25,217 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-20 05:11:25,217 INFO L82 PathProgramCache]: Analyzing trace with hash 1304115419, now seen corresponding path program 1 times [2019-11-20 05:11:25,217 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-20 05:11:25,218 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [860579904] [2019-11-20 05:11:25,218 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-20 05:11:25,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-20 05:11:25,318 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 05:11:25,319 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [860579904] [2019-11-20 05:11:25,319 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-20 05:11:25,319 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-20 05:11:25,319 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2077659278] [2019-11-20 05:11:25,320 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-20 05:11:25,321 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-20 05:11:25,321 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-20 05:11:25,321 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-20 05:11:25,321 INFO L87 Difference]: Start difference. First operand 13 states and 15 transitions. Second operand 3 states. [2019-11-20 05:11:25,357 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-20 05:11:25,357 INFO L93 Difference]: Finished difference Result 23 states and 27 transitions. [2019-11-20 05:11:25,358 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-20 05:11:25,358 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 9 [2019-11-20 05:11:25,358 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-20 05:11:25,358 INFO L225 Difference]: With dead ends: 23 [2019-11-20 05:11:25,358 INFO L226 Difference]: Without dead ends: 15 [2019-11-20 05:11:25,359 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 05:11:25,360 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2019-11-20 05:11:25,362 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 14. [2019-11-20 05:11:25,362 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2019-11-20 05:11:25,362 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2019-11-20 05:11:25,363 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 9 [2019-11-20 05:11:25,363 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-20 05:11:25,363 INFO L462 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2019-11-20 05:11:25,363 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-20 05:11:25,363 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2019-11-20 05:11:25,363 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2019-11-20 05:11:25,363 INFO L402 BasicCegarLoop]: Found error trace [2019-11-20 05:11:25,364 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-20 05:11:25,364 INFO L410 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-20 05:11:25,364 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-20 05:11:25,364 INFO L82 PathProgramCache]: Analyzing trace with hash -1358761923, now seen corresponding path program 1 times [2019-11-20 05:11:25,364 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-20 05:11:25,365 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [44921164] [2019-11-20 05:11:25,365 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-20 05:11:25,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-20 05:11:25,414 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-20 05:11:25,415 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [44921164] [2019-11-20 05:11:25,415 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-20 05:11:25,415 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-11-20 05:11:25,415 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [770362412] [2019-11-20 05:11:25,416 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-20 05:11:25,416 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-20 05:11:25,416 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-20 05:11:25,416 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-11-20 05:11:25,416 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand 4 states. [2019-11-20 05:11:25,465 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-20 05:11:25,465 INFO L93 Difference]: Finished difference Result 22 states and 25 transitions. [2019-11-20 05:11:25,466 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-20 05:11:25,467 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 11 [2019-11-20 05:11:25,467 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-20 05:11:25,467 INFO L225 Difference]: With dead ends: 22 [2019-11-20 05:11:25,467 INFO L226 Difference]: Without dead ends: 18 [2019-11-20 05:11:25,468 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 [2019-11-20 05:11:25,468 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2019-11-20 05:11:25,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 15. [2019-11-20 05:11:25,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2019-11-20 05:11:25,471 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2019-11-20 05:11:25,472 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 11 [2019-11-20 05:11:25,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-20 05:11:25,472 INFO L462 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2019-11-20 05:11:25,472 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-20 05:11:25,472 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2019-11-20 05:11:25,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-11-20 05:11:25,473 INFO L402 BasicCegarLoop]: Found error trace [2019-11-20 05:11:25,473 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-20 05:11:25,473 INFO L410 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-20 05:11:25,473 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-20 05:11:25,474 INFO L82 PathProgramCache]: Analyzing trace with hash -1565637502, now seen corresponding path program 1 times [2019-11-20 05:11:25,474 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-20 05:11:25,474 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1216945906] [2019-11-20 05:11:25,474 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-20 05:11:25,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-20 05:11:25,922 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-20 05:11:25,925 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1216945906] [2019-11-20 05:11:25,926 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [608823912] [2019-11-20 05:11:25,926 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_9d2d1b2d-29f1-4bf5-83c5-0c7496199b25/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 [2019-11-20 05:11:25,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-20 05:11:25,993 INFO L255 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 24 conjunts are in the unsatisfiable core [2019-11-20 05:11:26,001 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-20 05:11:26,067 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 [2019-11-20 05:11:26,068 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-20 05:11:26,082 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-20 05:11:26,094 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 [2019-11-20 05:11:26,094 INFO L496 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2019-11-20 05:11:26,119 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-20 05:11:26,120 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-11-20 05:11:26,120 INFO L221 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:30, output treesize:22 [2019-11-20 05:11:26,164 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 [2019-11-20 05:11:26,165 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-20 05:11:26,183 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-20 05:11:26,184 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-11-20 05:11:26,184 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:36, output treesize:32 [2019-11-20 05:11:26,442 INFO L343 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2019-11-20 05:11:26,442 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 [2019-11-20 05:11:26,444 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-20 05:11:26,484 INFO L567 ElimStorePlain]: treesize reduction 32, result has 63.2 percent of original size [2019-11-20 05:11:26,486 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. [2019-11-20 05:11:26,486 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 5 variables, input treesize:70, output treesize:55 [2019-11-20 05:11:26,550 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-20 05:11:26,590 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-20 05:11:26,591 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-20 05:11:26,591 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9] total 18 [2019-11-20 05:11:26,591 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1716360589] [2019-11-20 05:11:26,592 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-11-20 05:11:26,592 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-20 05:11:26,592 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-11-20 05:11:26,595 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=255, Unknown=0, NotChecked=0, Total=306 [2019-11-20 05:11:26,596 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 18 states. [2019-11-20 05:11:27,337 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-20 05:11:27,338 INFO L93 Difference]: Finished difference Result 33 states and 40 transitions. [2019-11-20 05:11:27,338 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2019-11-20 05:11:27,338 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 14 [2019-11-20 05:11:27,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-20 05:11:27,340 INFO L225 Difference]: With dead ends: 33 [2019-11-20 05:11:27,341 INFO L226 Difference]: Without dead ends: 24 [2019-11-20 05:11:27,342 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 119 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=126, Invalid=524, Unknown=0, NotChecked=0, Total=650 [2019-11-20 05:11:27,343 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2019-11-20 05:11:27,347 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 21. [2019-11-20 05:11:27,347 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2019-11-20 05:11:27,348 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 24 transitions. [2019-11-20 05:11:27,348 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 24 transitions. Word has length 14 [2019-11-20 05:11:27,348 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-20 05:11:27,348 INFO L462 AbstractCegarLoop]: Abstraction has 21 states and 24 transitions. [2019-11-20 05:11:27,349 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-11-20 05:11:27,349 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 24 transitions. [2019-11-20 05:11:27,349 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-11-20 05:11:27,349 INFO L402 BasicCegarLoop]: Found error trace [2019-11-20 05:11:27,350 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-20 05:11:27,550 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-20 05:11:27,551 INFO L410 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-20 05:11:27,551 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-20 05:11:27,551 INFO L82 PathProgramCache]: Analyzing trace with hash -472130976, now seen corresponding path program 2 times [2019-11-20 05:11:27,552 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-20 05:11:27,552 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1182762114] [2019-11-20 05:11:27,552 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-20 05:11:27,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-20 05:11:27,654 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-20 05:11:27,655 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1182762114] [2019-11-20 05:11:27,655 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [771650078] [2019-11-20 05:11:27,655 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_9d2d1b2d-29f1-4bf5-83c5-0c7496199b25/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 [2019-11-20 05:11:27,706 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-20 05:11:27,707 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-20 05:11:27,708 INFO L255 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-20 05:11:27,710 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-20 05:11:27,756 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-20 05:11:27,756 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-20 05:11:27,756 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2019-11-20 05:11:27,757 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1042319182] [2019-11-20 05:11:27,757 INFO L442 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-11-20 05:11:27,757 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-20 05:11:27,757 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-11-20 05:11:27,758 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2019-11-20 05:11:27,758 INFO L87 Difference]: Start difference. First operand 21 states and 24 transitions. Second operand 10 states. [2019-11-20 05:11:27,925 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-20 05:11:27,925 INFO L93 Difference]: Finished difference Result 31 states and 36 transitions. [2019-11-20 05:11:27,927 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-11-20 05:11:27,927 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 16 [2019-11-20 05:11:27,927 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-20 05:11:27,928 INFO L225 Difference]: With dead ends: 31 [2019-11-20 05:11:27,928 INFO L226 Difference]: Without dead ends: 27 [2019-11-20 05:11:27,929 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 [2019-11-20 05:11:27,929 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2019-11-20 05:11:27,933 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 23. [2019-11-20 05:11:27,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2019-11-20 05:11:27,934 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 27 transitions. [2019-11-20 05:11:27,935 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 27 transitions. Word has length 16 [2019-11-20 05:11:27,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-20 05:11:27,935 INFO L462 AbstractCegarLoop]: Abstraction has 23 states and 27 transitions. [2019-11-20 05:11:27,935 INFO L463 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-11-20 05:11:27,936 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 27 transitions. [2019-11-20 05:11:27,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-11-20 05:11:27,936 INFO L402 BasicCegarLoop]: Found error trace [2019-11-20 05:11:27,936 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-20 05:11:28,142 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-20 05:11:28,143 INFO L410 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-20 05:11:28,143 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-20 05:11:28,143 INFO L82 PathProgramCache]: Analyzing trace with hash -1317941731, now seen corresponding path program 3 times [2019-11-20 05:11:28,144 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-20 05:11:28,144 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [137714856] [2019-11-20 05:11:28,144 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-20 05:11:28,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-20 05:11:28,221 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-20 05:11:28,221 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [137714856] [2019-11-20 05:11:28,221 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1927151327] [2019-11-20 05:11:28,221 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_9d2d1b2d-29f1-4bf5-83c5-0c7496199b25/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 [2019-11-20 05:11:28,264 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-11-20 05:11:28,265 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-20 05:11:28,266 INFO L255 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-20 05:11:28,267 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-20 05:11:28,309 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-20 05:11:28,309 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-20 05:11:28,309 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2019-11-20 05:11:28,309 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1788793032] [2019-11-20 05:11:28,310 INFO L442 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-11-20 05:11:28,310 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-20 05:11:28,310 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-11-20 05:11:28,310 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2019-11-20 05:11:28,311 INFO L87 Difference]: Start difference. First operand 23 states and 27 transitions. Second operand 10 states. [2019-11-20 05:11:28,411 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-20 05:11:28,411 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2019-11-20 05:11:28,412 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-11-20 05:11:28,412 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 17 [2019-11-20 05:11:28,412 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-20 05:11:28,413 INFO L225 Difference]: With dead ends: 35 [2019-11-20 05:11:28,413 INFO L226 Difference]: Without dead ends: 23 [2019-11-20 05:11:28,413 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 [2019-11-20 05:11:28,414 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2019-11-20 05:11:28,417 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 20. [2019-11-20 05:11:28,417 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2019-11-20 05:11:28,418 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 23 transitions. [2019-11-20 05:11:28,418 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 23 transitions. Word has length 17 [2019-11-20 05:11:28,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-20 05:11:28,418 INFO L462 AbstractCegarLoop]: Abstraction has 20 states and 23 transitions. [2019-11-20 05:11:28,418 INFO L463 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-11-20 05:11:28,419 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 23 transitions. [2019-11-20 05:11:28,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2019-11-20 05:11:28,419 INFO L402 BasicCegarLoop]: Found error trace [2019-11-20 05:11:28,419 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-20 05:11:28,622 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-20 05:11:28,623 INFO L410 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-20 05:11:28,623 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-20 05:11:28,623 INFO L82 PathProgramCache]: Analyzing trace with hash -1991965825, now seen corresponding path program 4 times [2019-11-20 05:11:28,623 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-20 05:11:28,624 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2018455138] [2019-11-20 05:11:28,624 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-20 05:11:28,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-11-20 05:11:28,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-11-20 05:11:28,706 INFO L174 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2019-11-20 05:11:28,706 INFO L475 BasicCegarLoop]: Counterexample might be feasible [2019-11-20 05:11:28,738 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.11 05:11:28 BoogieIcfgContainer [2019-11-20 05:11:28,738 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2019-11-20 05:11:28,738 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2019-11-20 05:11:28,739 INFO L271 PluginConnector]: Initializing Witness Printer... [2019-11-20 05:11:28,739 INFO L275 PluginConnector]: Witness Printer initialized [2019-11-20 05:11:28,739 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 05:11:24" (3/4) ... [2019-11-20 05:11:28,741 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2019-11-20 05:11:28,791 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_9d2d1b2d-29f1-4bf5-83c5-0c7496199b25/bin/uautomizer/witness.graphml [2019-11-20 05:11:28,792 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2019-11-20 05:11:28,793 INFO L168 Benchmark]: Toolchain (without parser) took 4678.95 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 143.7 MB). Free memory was 950.1 MB in the beginning and 809.2 MB in the end (delta: 140.9 MB). Peak memory consumption was 284.6 MB. Max. memory is 11.5 GB. [2019-11-20 05:11:28,794 INFO L168 Benchmark]: CDTParser took 0.26 ms. Allocated memory is still 1.0 GB. Free memory is still 967.5 MB. There was no memory consumed. Max. memory is 11.5 GB. [2019-11-20 05:11:28,795 INFO L168 Benchmark]: CACSL2BoogieTranslator took 294.57 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 143.7 MB). Free memory was 950.1 MB in the beginning and 1.1 GB in the end (delta: -182.7 MB). Peak memory consumption was 23.2 MB. Max. memory is 11.5 GB. [2019-11-20 05:11:28,795 INFO L168 Benchmark]: Boogie Procedure Inliner took 35.45 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 05:11:28,796 INFO L168 Benchmark]: Boogie Preprocessor took 26.50 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 05:11:28,796 INFO L168 Benchmark]: RCFGBuilder took 344.98 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: 21.9 MB). Peak memory consumption was 21.9 MB. Max. memory is 11.5 GB. [2019-11-20 05:11:28,797 INFO L168 Benchmark]: TraceAbstraction took 3919.75 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 809.2 MB in the end (delta: 301.7 MB). Peak memory consumption was 301.7 MB. Max. memory is 11.5 GB. [2019-11-20 05:11:28,797 INFO L168 Benchmark]: Witness Printer took 53.40 ms. Allocated memory is still 1.2 GB. Free memory is still 809.2 MB. There was no memory consumed. Max. memory is 11.5 GB. [2019-11-20 05:11:28,800 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.26 ms. Allocated memory is still 1.0 GB. Free memory is still 967.5 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 294.57 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 143.7 MB). Free memory was 950.1 MB in the beginning and 1.1 GB in the end (delta: -182.7 MB). Peak memory consumption was 23.2 MB. Max. memory is 11.5 GB. * Boogie Procedure Inliner took 35.45 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 26.50 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 344.98 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: 21.9 MB). Peak memory consumption was 21.9 MB. Max. memory is 11.5 GB. * TraceAbstraction took 3919.75 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 809.2 MB in the end (delta: 301.7 MB). Peak memory consumption was 301.7 MB. Max. memory is 11.5 GB. * Witness Printer took 53.40 ms. Allocated memory is still 1.2 GB. Free memory is still 809.2 MB. There was no memory consumed. 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