./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/array-fpi/ifeqn4f.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 30f4e4ab Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx12G -Xms1G -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerReach.xml -i ../sv-benchmarks/c/array-fpi/ifeqn4f.c -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --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 e94f3026ebecc74fab5a8ed6ab8b3cbfd7d45765 .................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................. 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 0.1.24-30f4e4a [2019-11-27 22:29:44,198 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-27 22:29:44,200 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-27 22:29:44,219 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-27 22:29:44,220 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-27 22:29:44,221 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-27 22:29:44,224 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-27 22:29:44,234 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-27 22:29:44,239 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-27 22:29:44,243 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-27 22:29:44,245 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-27 22:29:44,247 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-27 22:29:44,247 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-27 22:29:44,251 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-27 22:29:44,253 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-27 22:29:44,254 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-27 22:29:44,256 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-27 22:29:44,257 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-27 22:29:44,260 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-27 22:29:44,264 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-27 22:29:44,269 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-27 22:29:44,274 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-27 22:29:44,276 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-27 22:29:44,278 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-27 22:29:44,281 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-11-27 22:29:44,281 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-11-27 22:29:44,282 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-11-27 22:29:44,284 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-11-27 22:29:44,284 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-11-27 22:29:44,285 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-11-27 22:29:44,286 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-11-27 22:29:44,287 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-11-27 22:29:44,287 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-11-27 22:29:44,289 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-11-27 22:29:44,291 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-11-27 22:29:44,291 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-11-27 22:29:44,292 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-11-27 22:29:44,292 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-11-27 22:29:44,293 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-27 22:29:44,294 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-27 22:29:44,295 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-27 22:29:44,296 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2019-11-27 22:29:44,331 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-27 22:29:44,335 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-27 22:29:44,336 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-27 22:29:44,337 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-27 22:29:44,337 INFO L138 SettingsManager]: * Use SBE=true [2019-11-27 22:29:44,337 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-27 22:29:44,340 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-27 22:29:44,340 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-27 22:29:44,340 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-27 22:29:44,341 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-27 22:29:44,341 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-27 22:29:44,341 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-27 22:29:44,341 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-27 22:29:44,342 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-27 22:29:44,343 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-27 22:29:44,343 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-27 22:29:44,343 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-27 22:29:44,343 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-27 22:29:44,344 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-27 22:29:44,344 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-27 22:29:44,344 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-27 22:29:44,344 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-27 22:29:44,345 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-27 22:29:44,345 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-27 22:29:44,345 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-27 22:29:44,345 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-27 22:29:44,346 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-27 22:29:44,346 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-27 22:29:44,346 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 -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux 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 -> e94f3026ebecc74fab5a8ed6ab8b3cbfd7d45765 [2019-11-27 22:29:44,655 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-27 22:29:44,673 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-27 22:29:44,677 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-27 22:29:44,680 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-27 22:29:44,680 INFO L275 PluginConnector]: CDTParser initialized [2019-11-27 22:29:44,682 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-fpi/ifeqn4f.c [2019-11-27 22:29:44,753 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4d671c59d/822b4df64375439983b3fe97f0972231/FLAG8a40ccfc0 [2019-11-27 22:29:45,211 INFO L306 CDTParser]: Found 1 translation units. [2019-11-27 22:29:45,212 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-fpi/ifeqn4f.c [2019-11-27 22:29:45,219 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4d671c59d/822b4df64375439983b3fe97f0972231/FLAG8a40ccfc0 [2019-11-27 22:29:45,590 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4d671c59d/822b4df64375439983b3fe97f0972231 [2019-11-27 22:29:45,594 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-27 22:29:45,596 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2019-11-27 22:29:45,597 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-27 22:29:45,597 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-27 22:29:45,602 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-27 22:29:45,603 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.11 10:29:45" (1/1) ... [2019-11-27 22:29:45,606 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6d4287e6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.11 10:29:45, skipping insertion in model container [2019-11-27 22:29:45,607 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.11 10:29:45" (1/1) ... [2019-11-27 22:29:45,616 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2019-11-27 22:29:45,636 INFO L178 MainTranslator]: Built tables and reachable declarations [2019-11-27 22:29:45,827 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-27 22:29:45,837 INFO L203 MainTranslator]: Completed pre-run [2019-11-27 22:29:45,855 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-27 22:29:45,871 INFO L208 MainTranslator]: Completed translation [2019-11-27 22:29:45,872 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.11 10:29:45 WrapperNode [2019-11-27 22:29:45,872 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-27 22:29:45,873 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-11-27 22:29:45,873 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-11-27 22:29:45,874 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2019-11-27 22:29:45,941 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.11 10:29:45" (1/1) ... [2019-11-27 22:29:45,951 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.11 10:29:45" (1/1) ... [2019-11-27 22:29:45,976 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-11-27 22:29:45,977 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-27 22:29:45,977 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-27 22:29:45,977 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-27 22:29:45,985 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.11 10:29:45" (1/1) ... [2019-11-27 22:29:45,985 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.11 10:29:45" (1/1) ... [2019-11-27 22:29:45,987 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.11 10:29:45" (1/1) ... [2019-11-27 22:29:45,987 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.11 10:29:45" (1/1) ... [2019-11-27 22:29:46,002 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.11 10:29:45" (1/1) ... [2019-11-27 22:29:46,010 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.11 10:29:45" (1/1) ... [2019-11-27 22:29:46,012 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.11 10:29:45" (1/1) ... [2019-11-27 22:29:46,014 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-27 22:29:46,014 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-27 22:29:46,015 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-27 22:29:46,015 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-27 22:29:46,016 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.11 10:29:45" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-27 22:29:46,077 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-11-27 22:29:46,077 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2019-11-27 22:29:46,078 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-27 22:29:46,078 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-27 22:29:46,078 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-11-27 22:29:46,305 INFO L292 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-27 22:29:46,306 INFO L297 CfgBuilder]: Removed 9 assume(true) statements. [2019-11-27 22:29:46,308 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.11 10:29:46 BoogieIcfgContainer [2019-11-27 22:29:46,308 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-27 22:29:46,310 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-27 22:29:46,310 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-27 22:29:46,315 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-27 22:29:46,316 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 27.11 10:29:45" (1/3) ... [2019-11-27 22:29:46,317 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@78cb6fe9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.11 10:29:46, skipping insertion in model container [2019-11-27 22:29:46,318 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.11 10:29:45" (2/3) ... [2019-11-27 22:29:46,318 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@78cb6fe9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.11 10:29:46, skipping insertion in model container [2019-11-27 22:29:46,319 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.11 10:29:46" (3/3) ... [2019-11-27 22:29:46,321 INFO L109 eAbstractionObserver]: Analyzing ICFG ifeqn4f.c [2019-11-27 22:29:46,336 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-27 22:29:46,346 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-27 22:29:46,360 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-27 22:29:46,389 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-27 22:29:46,389 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-27 22:29:46,390 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-27 22:29:46,390 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-27 22:29:46,390 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-27 22:29:46,391 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-27 22:29:46,391 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-27 22:29:46,391 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-27 22:29:46,409 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2019-11-27 22:29:46,416 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-11-27 22:29:46,416 INFO L402 BasicCegarLoop]: Found error trace [2019-11-27 22:29:46,418 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-27 22:29:46,418 INFO L410 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-27 22:29:46,425 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-27 22:29:46,425 INFO L82 PathProgramCache]: Analyzing trace with hash -1201566748, now seen corresponding path program 1 times [2019-11-27 22:29:46,435 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-27 22:29:46,436 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1819718262] [2019-11-27 22:29:46,437 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-27 22:29:46,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-27 22:29:46,564 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-27 22:29:46,565 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1819718262] [2019-11-27 22:29:46,566 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-27 22:29:46,566 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-11-27 22:29:46,567 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1318424553] [2019-11-27 22:29:46,572 INFO L442 AbstractCegarLoop]: Interpolant automaton has 2 states [2019-11-27 22:29:46,573 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-27 22:29:46,587 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2019-11-27 22:29:46,588 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-11-27 22:29:46,590 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 2 states. [2019-11-27 22:29:46,609 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-27 22:29:46,609 INFO L93 Difference]: Finished difference Result 36 states and 50 transitions. [2019-11-27 22:29:46,610 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2019-11-27 22:29:46,611 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2019-11-27 22:29:46,612 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-27 22:29:46,622 INFO L225 Difference]: With dead ends: 36 [2019-11-27 22:29:46,622 INFO L226 Difference]: Without dead ends: 17 [2019-11-27 22:29:46,626 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 [2019-11-27 22:29:46,648 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2019-11-27 22:29:46,664 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2019-11-27 22:29:46,665 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2019-11-27 22:29:46,666 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 21 transitions. [2019-11-27 22:29:46,668 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 21 transitions. Word has length 10 [2019-11-27 22:29:46,668 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-27 22:29:46,668 INFO L462 AbstractCegarLoop]: Abstraction has 17 states and 21 transitions. [2019-11-27 22:29:46,669 INFO L463 AbstractCegarLoop]: Interpolant automaton has 2 states. [2019-11-27 22:29:46,669 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 21 transitions. [2019-11-27 22:29:46,669 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-11-27 22:29:46,670 INFO L402 BasicCegarLoop]: Found error trace [2019-11-27 22:29:46,670 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-27 22:29:46,670 INFO L410 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-27 22:29:46,671 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-27 22:29:46,671 INFO L82 PathProgramCache]: Analyzing trace with hash 1920794649, now seen corresponding path program 1 times [2019-11-27 22:29:46,671 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-27 22:29:46,672 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1522948651] [2019-11-27 22:29:46,672 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-27 22:29:46,690 ERROR L271 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-11-27 22:29:46,691 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [50254276] [2019-11-27 22:29:46,691 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/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 [2019-11-27 22:29:46,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-27 22:29:46,760 INFO L255 TraceCheckSpWp]: Trace formula consists of 56 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-27 22:29:46,770 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-27 22:29:46,815 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-27 22:29:46,815 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1522948651] [2019-11-27 22:29:46,816 INFO L343 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-27 22:29:46,816 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [50254276] [2019-11-27 22:29:46,816 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-27 22:29:46,817 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-27 22:29:46,817 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1323622893] [2019-11-27 22:29:46,819 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-27 22:29:46,819 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-27 22:29:46,820 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-27 22:29:46,820 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-27 22:29:46,820 INFO L87 Difference]: Start difference. First operand 17 states and 21 transitions. Second operand 3 states. [2019-11-27 22:29:46,887 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-27 22:29:46,887 INFO L93 Difference]: Finished difference Result 31 states and 39 transitions. [2019-11-27 22:29:46,888 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-27 22:29:46,888 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2019-11-27 22:29:46,888 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-27 22:29:46,889 INFO L225 Difference]: With dead ends: 31 [2019-11-27 22:29:46,889 INFO L226 Difference]: Without dead ends: 20 [2019-11-27 22:29:46,890 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-27 22:29:46,891 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2019-11-27 22:29:46,895 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 18. [2019-11-27 22:29:46,895 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2019-11-27 22:29:46,896 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 22 transitions. [2019-11-27 22:29:46,896 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 22 transitions. Word has length 10 [2019-11-27 22:29:46,896 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-27 22:29:46,897 INFO L462 AbstractCegarLoop]: Abstraction has 18 states and 22 transitions. [2019-11-27 22:29:46,897 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-27 22:29:46,897 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 22 transitions. [2019-11-27 22:29:46,898 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-11-27 22:29:46,898 INFO L402 BasicCegarLoop]: Found error trace [2019-11-27 22:29:46,898 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-27 22:29:47,102 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-27 22:29:47,102 INFO L410 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-27 22:29:47,103 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-27 22:29:47,103 INFO L82 PathProgramCache]: Analyzing trace with hash -1948223762, now seen corresponding path program 1 times [2019-11-27 22:29:47,104 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-27 22:29:47,105 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [828507041] [2019-11-27 22:29:47,105 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-27 22:29:47,148 ERROR L271 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-11-27 22:29:47,151 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1705076556] [2019-11-27 22:29:47,151 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/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 [2019-11-27 22:29:47,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-27 22:29:47,232 INFO L255 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-27 22:29:47,234 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-27 22:29:47,262 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-27 22:29:47,263 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [828507041] [2019-11-27 22:29:47,263 INFO L343 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-27 22:29:47,263 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1705076556] [2019-11-27 22:29:47,263 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-27 22:29:47,263 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-11-27 22:29:47,266 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [603169870] [2019-11-27 22:29:47,267 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-27 22:29:47,267 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-27 22:29:47,268 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-27 22:29:47,268 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-11-27 22:29:47,269 INFO L87 Difference]: Start difference. First operand 18 states and 22 transitions. Second operand 4 states. [2019-11-27 22:29:47,349 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-27 22:29:47,349 INFO L93 Difference]: Finished difference Result 36 states and 43 transitions. [2019-11-27 22:29:47,350 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-27 22:29:47,350 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 13 [2019-11-27 22:29:47,350 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-27 22:29:47,351 INFO L225 Difference]: With dead ends: 36 [2019-11-27 22:29:47,351 INFO L226 Difference]: Without dead ends: 29 [2019-11-27 22:29:47,352 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-11-27 22:29:47,353 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2019-11-27 22:29:47,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 19. [2019-11-27 22:29:47,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2019-11-27 22:29:47,360 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 23 transitions. [2019-11-27 22:29:47,361 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 23 transitions. Word has length 13 [2019-11-27 22:29:47,361 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-27 22:29:47,361 INFO L462 AbstractCegarLoop]: Abstraction has 19 states and 23 transitions. [2019-11-27 22:29:47,361 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-27 22:29:47,362 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 23 transitions. [2019-11-27 22:29:47,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-11-27 22:29:47,363 INFO L402 BasicCegarLoop]: Found error trace [2019-11-27 22:29:47,363 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-27 22:29:47,577 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-27 22:29:47,578 INFO L410 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-27 22:29:47,578 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-27 22:29:47,579 INFO L82 PathProgramCache]: Analyzing trace with hash -1326513248, now seen corresponding path program 1 times [2019-11-27 22:29:47,579 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-27 22:29:47,580 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1171413432] [2019-11-27 22:29:47,580 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-27 22:29:47,600 ERROR L271 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-11-27 22:29:47,600 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1323187304] [2019-11-27 22:29:47,601 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/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 [2019-11-27 22:29:47,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-27 22:29:47,661 INFO L255 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 12 conjunts are in the unsatisfiable core [2019-11-27 22:29:47,666 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-27 22:29:47,706 INFO L377 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 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 [2019-11-27 22:29:47,707 INFO L508 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-27 22:29:47,713 INFO L588 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-27 22:29:47,714 INFO L508 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-11-27 22:29:47,714 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:11, output treesize:7 [2019-11-27 22:29:47,735 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-27 22:29:47,748 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-27 22:29:47,748 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1171413432] [2019-11-27 22:29:47,748 INFO L343 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-27 22:29:47,749 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1323187304] [2019-11-27 22:29:47,749 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-27 22:29:47,749 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-11-27 22:29:47,750 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [745889275] [2019-11-27 22:29:47,750 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-11-27 22:29:47,751 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-27 22:29:47,751 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-11-27 22:29:47,751 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2019-11-27 22:29:47,751 INFO L87 Difference]: Start difference. First operand 19 states and 23 transitions. Second operand 5 states. [2019-11-27 22:29:47,847 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-27 22:29:47,847 INFO L93 Difference]: Finished difference Result 37 states and 43 transitions. [2019-11-27 22:29:47,848 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-11-27 22:29:47,848 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 16 [2019-11-27 22:29:47,849 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-27 22:29:47,849 INFO L225 Difference]: With dead ends: 37 [2019-11-27 22:29:47,849 INFO L226 Difference]: Without dead ends: 35 [2019-11-27 22:29:47,850 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2019-11-27 22:29:47,851 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2019-11-27 22:29:47,855 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 25. [2019-11-27 22:29:47,856 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2019-11-27 22:29:47,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 31 transitions. [2019-11-27 22:29:47,857 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 31 transitions. Word has length 16 [2019-11-27 22:29:47,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-27 22:29:47,858 INFO L462 AbstractCegarLoop]: Abstraction has 25 states and 31 transitions. [2019-11-27 22:29:47,858 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-11-27 22:29:47,858 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 31 transitions. [2019-11-27 22:29:47,859 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-11-27 22:29:47,859 INFO L402 BasicCegarLoop]: Found error trace [2019-11-27 22:29:47,859 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-27 22:29:48,066 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-27 22:29:48,067 INFO L410 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-27 22:29:48,067 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-27 22:29:48,068 INFO L82 PathProgramCache]: Analyzing trace with hash 448494114, now seen corresponding path program 1 times [2019-11-27 22:29:48,068 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-27 22:29:48,069 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [359493502] [2019-11-27 22:29:48,069 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-27 22:29:48,093 ERROR L271 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-11-27 22:29:48,093 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1097957407] [2019-11-27 22:29:48,094 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-27 22:29:48,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-27 22:29:48,134 INFO L255 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-27 22:29:48,136 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-27 22:29:48,142 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-27 22:29:48,142 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [359493502] [2019-11-27 22:29:48,142 INFO L343 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-27 22:29:48,143 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1097957407] [2019-11-27 22:29:48,143 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-27 22:29:48,143 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-27 22:29:48,144 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1790994071] [2019-11-27 22:29:48,144 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-27 22:29:48,144 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-27 22:29:48,145 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-27 22:29:48,145 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-27 22:29:48,145 INFO L87 Difference]: Start difference. First operand 25 states and 31 transitions. Second operand 3 states. [2019-11-27 22:29:48,192 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-27 22:29:48,193 INFO L93 Difference]: Finished difference Result 48 states and 60 transitions. [2019-11-27 22:29:48,193 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-27 22:29:48,193 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 16 [2019-11-27 22:29:48,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-27 22:29:48,194 INFO L225 Difference]: With dead ends: 48 [2019-11-27 22:29:48,194 INFO L226 Difference]: Without dead ends: 27 [2019-11-27 22:29:48,195 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-27 22:29:48,195 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2019-11-27 22:29:48,199 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 23. [2019-11-27 22:29:48,199 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2019-11-27 22:29:48,200 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 27 transitions. [2019-11-27 22:29:48,200 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 27 transitions. Word has length 16 [2019-11-27 22:29:48,200 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-27 22:29:48,200 INFO L462 AbstractCegarLoop]: Abstraction has 23 states and 27 transitions. [2019-11-27 22:29:48,200 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-27 22:29:48,201 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 27 transitions. [2019-11-27 22:29:48,201 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-11-27 22:29:48,201 INFO L402 BasicCegarLoop]: Found error trace [2019-11-27 22:29:48,202 INFO L410 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-27 22:29:48,402 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-27 22:29:48,402 INFO L410 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-27 22:29:48,403 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-27 22:29:48,403 INFO L82 PathProgramCache]: Analyzing trace with hash -579781034, now seen corresponding path program 1 times [2019-11-27 22:29:48,403 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-27 22:29:48,404 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [361908701] [2019-11-27 22:29:48,404 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-27 22:29:48,421 ERROR L271 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-11-27 22:29:48,422 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [111789675] [2019-11-27 22:29:48,423 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-27 22:29:48,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-27 22:29:48,490 INFO L255 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-27 22:29:48,492 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-27 22:29:48,552 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-27 22:29:48,553 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [361908701] [2019-11-27 22:29:48,553 INFO L343 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-27 22:29:48,553 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [111789675] [2019-11-27 22:29:48,553 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2019-11-27 22:29:48,554 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2019-11-27 22:29:48,555 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1307690777] [2019-11-27 22:29:48,555 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-11-27 22:29:48,556 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-27 22:29:48,556 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-11-27 22:29:48,556 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2019-11-27 22:29:48,556 INFO L87 Difference]: Start difference. First operand 23 states and 27 transitions. Second operand 7 states. [2019-11-27 22:29:48,689 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-27 22:29:48,689 INFO L93 Difference]: Finished difference Result 63 states and 74 transitions. [2019-11-27 22:29:48,690 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-11-27 22:29:48,690 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 20 [2019-11-27 22:29:48,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-27 22:29:48,691 INFO L225 Difference]: With dead ends: 63 [2019-11-27 22:29:48,691 INFO L226 Difference]: Without dead ends: 39 [2019-11-27 22:29:48,692 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2019-11-27 22:29:48,693 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2019-11-27 22:29:48,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 27. [2019-11-27 22:29:48,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2019-11-27 22:29:48,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 31 transitions. [2019-11-27 22:29:48,699 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 31 transitions. Word has length 20 [2019-11-27 22:29:48,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-27 22:29:48,699 INFO L462 AbstractCegarLoop]: Abstraction has 27 states and 31 transitions. [2019-11-27 22:29:48,699 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-11-27 22:29:48,700 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 31 transitions. [2019-11-27 22:29:48,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2019-11-27 22:29:48,700 INFO L402 BasicCegarLoop]: Found error trace [2019-11-27 22:29:48,701 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-27 22:29:48,904 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-27 22:29:48,905 INFO L410 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-27 22:29:48,905 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-27 22:29:48,905 INFO L82 PathProgramCache]: Analyzing trace with hash 1490131379, now seen corresponding path program 1 times [2019-11-27 22:29:48,905 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-27 22:29:48,906 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [563790897] [2019-11-27 22:29:48,906 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-27 22:29:48,924 ERROR L271 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-11-27 22:29:48,926 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1494334677] [2019-11-27 22:29:48,926 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-27 22:29:48,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-11-27 22:29:48,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-11-27 22:29:49,016 INFO L174 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2019-11-27 22:29:49,016 INFO L475 BasicCegarLoop]: Counterexample might be feasible [2019-11-27 22:29:49,225 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-27 22:29:49,264 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 27.11 10:29:49 BoogieIcfgContainer [2019-11-27 22:29:49,264 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2019-11-27 22:29:49,265 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2019-11-27 22:29:49,265 INFO L271 PluginConnector]: Initializing Witness Printer... [2019-11-27 22:29:49,265 INFO L275 PluginConnector]: Witness Printer initialized [2019-11-27 22:29:49,266 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.11 10:29:46" (3/4) ... [2019-11-27 22:29:49,268 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2019-11-27 22:29:49,347 INFO L141 WitnessManager]: Wrote witness to /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/witness.graphml [2019-11-27 22:29:49,347 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2019-11-27 22:29:49,351 INFO L168 Benchmark]: Toolchain (without parser) took 3753.73 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 132.1 MB). Free memory was 961.7 MB in the beginning and 928.8 MB in the end (delta: 33.0 MB). Peak memory consumption was 165.1 MB. Max. memory is 11.5 GB. [2019-11-27 22:29:49,351 INFO L168 Benchmark]: CDTParser took 0.36 ms. Allocated memory is still 1.0 GB. Free memory is still 987.2 MB. There was no memory consumed. Max. memory is 11.5 GB. [2019-11-27 22:29:49,352 INFO L168 Benchmark]: CACSL2BoogieTranslator took 276.18 ms. Allocated memory is still 1.0 GB. Free memory was 961.7 MB in the beginning and 951.0 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. [2019-11-27 22:29:49,352 INFO L168 Benchmark]: Boogie Procedure Inliner took 103.35 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 132.1 MB). Free memory was 951.0 MB in the beginning and 1.1 GB in the end (delta: -171.0 MB). Peak memory consumption was 9.8 MB. Max. memory is 11.5 GB. [2019-11-27 22:29:49,353 INFO L168 Benchmark]: Boogie Preprocessor took 37.22 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. [2019-11-27 22:29:49,353 INFO L168 Benchmark]: RCFGBuilder took 293.58 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: 20.3 MB). Peak memory consumption was 20.3 MB. Max. memory is 11.5 GB. [2019-11-27 22:29:49,354 INFO L168 Benchmark]: TraceAbstraction took 2954.47 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 935.4 MB in the end (delta: 166.3 MB). Peak memory consumption was 166.3 MB. Max. memory is 11.5 GB. [2019-11-27 22:29:49,354 INFO L168 Benchmark]: Witness Printer took 82.48 ms. Allocated memory is still 1.2 GB. Free memory was 935.4 MB in the beginning and 928.8 MB in the end (delta: 6.6 MB). Peak memory consumption was 6.6 MB. Max. memory is 11.5 GB. [2019-11-27 22:29:49,357 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.36 ms. Allocated memory is still 1.0 GB. Free memory is still 987.2 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 276.18 ms. Allocated memory is still 1.0 GB. Free memory was 961.7 MB in the beginning and 951.0 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. * Boogie Procedure Inliner took 103.35 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 132.1 MB). Free memory was 951.0 MB in the beginning and 1.1 GB in the end (delta: -171.0 MB). Peak memory consumption was 9.8 MB. Max. memory is 11.5 GB. * Boogie Preprocessor took 37.22 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 293.58 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: 20.3 MB). Peak memory consumption was 20.3 MB. Max. memory is 11.5 GB. * TraceAbstraction took 2954.47 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 935.4 MB in the end (delta: 166.3 MB). Peak memory consumption was 166.3 MB. Max. memory is 11.5 GB. * Witness Printer took 82.48 ms. Allocated memory is still 1.2 GB. Free memory was 935.4 MB in the beginning and 928.8 MB in the end (delta: 6.6 MB). Peak memory consumption was 6.6 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 *a = malloc(sizeof(long long)*N); [L24] long long *b = malloc(sizeof(long long)*N); [L26] i=0 VAL [N=2] [L26] COND TRUE i