/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/for_bounded_loop1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-267fbe0 [2020-07-17 12:15:39,882 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-17 12:15:39,885 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-17 12:15:39,904 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-17 12:15:39,904 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-17 12:15:39,906 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-17 12:15:39,908 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-17 12:15:39,917 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-17 12:15:39,922 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-17 12:15:39,924 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-17 12:15:39,926 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-17 12:15:39,927 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-17 12:15:39,929 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-17 12:15:39,931 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-17 12:15:39,933 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-17 12:15:39,935 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-17 12:15:39,936 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-17 12:15:39,938 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-17 12:15:39,939 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-17 12:15:39,945 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-17 12:15:39,950 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-17 12:15:39,954 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-17 12:15:39,955 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-17 12:15:39,956 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-17 12:15:39,958 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-17 12:15:39,968 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-17 12:15:39,968 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-17 12:15:39,970 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-17 12:15:39,970 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-17 12:15:40,003 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-17 12:15:40,004 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-17 12:15:40,006 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-17 12:15:40,006 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-17 12:15:40,006 INFO L138 SettingsManager]: * Use SBE=true [2020-07-17 12:15:40,009 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-17 12:15:40,010 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-17 12:15:40,010 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-17 12:15:40,010 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-17 12:15:40,010 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-17 12:15:40,010 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-17 12:15:40,011 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-17 12:15:40,011 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-17 12:15:40,011 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-17 12:15:40,011 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-17 12:15:40,011 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-17 12:15:40,011 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-17 12:15:40,012 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-17 12:15:40,012 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-17 12:15:40,012 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-17 12:15:40,013 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-17 12:15:40,013 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-17 12:15:40,014 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-17 12:15:40,014 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-17 12:15:40,014 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-17 12:15:40,014 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-17 12:15:40,014 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-17 12:15:40,014 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-17 12:15:40,015 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-17 12:15:40,015 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-07-17 12:15:40,306 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-17 12:15:40,319 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-17 12:15:40,323 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-17 12:15:40,324 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-17 12:15:40,325 INFO L275 PluginConnector]: CDTParser initialized [2020-07-17 12:15:40,326 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/for_bounded_loop1.c [2020-07-17 12:15:40,401 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/60d67650a/86ccf5701bf642efbfa2f78aac10dd12/FLAG6351a75a7 [2020-07-17 12:15:40,897 INFO L306 CDTParser]: Found 1 translation units. [2020-07-17 12:15:40,897 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/for_bounded_loop1.c [2020-07-17 12:15:40,904 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/60d67650a/86ccf5701bf642efbfa2f78aac10dd12/FLAG6351a75a7 [2020-07-17 12:15:41,244 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/60d67650a/86ccf5701bf642efbfa2f78aac10dd12 [2020-07-17 12:15:41,255 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-17 12:15:41,257 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-17 12:15:41,258 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-17 12:15:41,258 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-17 12:15:41,262 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-17 12:15:41,263 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.07 12:15:41" (1/1) ... [2020-07-17 12:15:41,266 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@cb8c099 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 12:15:41, skipping insertion in model container [2020-07-17 12:15:41,266 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.07 12:15:41" (1/1) ... [2020-07-17 12:15:41,274 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-17 12:15:41,294 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-17 12:15:41,472 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-17 12:15:41,481 INFO L203 MainTranslator]: Completed pre-run [2020-07-17 12:15:41,497 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-17 12:15:41,510 INFO L208 MainTranslator]: Completed translation [2020-07-17 12:15:41,510 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 12:15:41 WrapperNode [2020-07-17 12:15:41,510 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-17 12:15:41,511 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-17 12:15:41,511 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-17 12:15:41,511 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-17 12:15:41,523 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 12:15:41" (1/1) ... [2020-07-17 12:15:41,523 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 12:15:41" (1/1) ... [2020-07-17 12:15:41,529 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 12:15:41" (1/1) ... [2020-07-17 12:15:41,529 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 12:15:41" (1/1) ... [2020-07-17 12:15:41,533 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 12:15:41" (1/1) ... [2020-07-17 12:15:41,537 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 12:15:41" (1/1) ... [2020-07-17 12:15:41,538 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 12:15:41" (1/1) ... [2020-07-17 12:15:41,625 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-17 12:15:41,625 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-17 12:15:41,625 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-17 12:15:41,626 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-17 12:15:41,626 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 12:15:41" (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 [2020-07-17 12:15:41,697 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-17 12:15:41,697 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-17 12:15:41,697 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-17 12:15:41,698 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-17 12:15:41,698 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-17 12:15:41,698 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-17 12:15:41,698 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-17 12:15:41,698 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-17 12:15:41,698 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-17 12:15:41,698 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-17 12:15:41,698 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-17 12:15:41,699 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-17 12:15:41,699 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-17 12:15:41,906 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-17 12:15:41,906 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-17 12:15:41,911 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 17.07 12:15:41 BoogieIcfgContainer [2020-07-17 12:15:41,911 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-17 12:15:41,912 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-17 12:15:41,912 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-17 12:15:41,916 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-17 12:15:41,916 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 17.07 12:15:41" (1/3) ... [2020-07-17 12:15:41,917 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4a208427 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 17.07 12:15:41, skipping insertion in model container [2020-07-17 12:15:41,918 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 12:15:41" (2/3) ... [2020-07-17 12:15:41,918 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4a208427 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 17.07 12:15:41, skipping insertion in model container [2020-07-17 12:15:41,918 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 17.07 12:15:41" (3/3) ... [2020-07-17 12:15:41,920 INFO L109 eAbstractionObserver]: Analyzing ICFG for_bounded_loop1.c [2020-07-17 12:15:41,933 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-07-17 12:15:41,941 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-17 12:15:41,965 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-17 12:15:41,995 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-17 12:15:41,995 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-17 12:15:41,995 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-07-17 12:15:41,995 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-17 12:15:41,995 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-17 12:15:41,996 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-17 12:15:41,996 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-17 12:15:41,996 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-17 12:15:42,021 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states. [2020-07-17 12:15:42,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-07-17 12:15:42,029 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 12:15:42,030 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 12:15:42,031 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 12:15:42,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 12:15:42,038 INFO L82 PathProgramCache]: Analyzing trace with hash 1474053726, now seen corresponding path program 1 times [2020-07-17 12:15:42,049 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-07-17 12:15:42,050 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1148302679] [2020-07-17 12:15:42,050 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 12:15:42,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 12:15:42,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 12:15:42,169 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-17 12:15:42,169 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1148302679] [2020-07-17 12:15:42,170 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-17 12:15:42,171 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-07-17 12:15:42,171 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [220306343] [2020-07-17 12:15:42,177 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-07-17 12:15:42,177 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-07-17 12:15:42,188 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-07-17 12:15:42,189 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-17 12:15:42,191 INFO L87 Difference]: Start difference. First operand 23 states. Second operand 2 states. [2020-07-17 12:15:42,214 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 12:15:42,214 INFO L93 Difference]: Finished difference Result 40 states and 54 transitions. [2020-07-17 12:15:42,215 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-07-17 12:15:42,216 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 11 [2020-07-17 12:15:42,217 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 12:15:42,226 INFO L225 Difference]: With dead ends: 40 [2020-07-17 12:15:42,227 INFO L226 Difference]: Without dead ends: 19 [2020-07-17 12:15:42,231 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-17 12:15:42,247 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-07-17 12:15:42,265 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-07-17 12:15:42,266 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-07-17 12:15:42,268 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2020-07-17 12:15:42,269 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 11 [2020-07-17 12:15:42,269 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 12:15:42,269 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2020-07-17 12:15:42,270 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-07-17 12:15:42,270 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2020-07-17 12:15:42,271 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-07-17 12:15:42,271 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 12:15:42,271 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 12:15:42,272 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-07-17 12:15:42,272 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 12:15:42,272 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 12:15:42,273 INFO L82 PathProgramCache]: Analyzing trace with hash 1462047953, now seen corresponding path program 1 times [2020-07-17 12:15:42,273 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-07-17 12:15:42,273 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1136567355] [2020-07-17 12:15:42,273 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 12:15:42,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 12:15:42,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 12:15:42,330 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-17 12:15:42,330 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1136567355] [2020-07-17 12:15:42,331 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-17 12:15:42,331 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-17 12:15:42,331 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [622071581] [2020-07-17 12:15:42,333 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-17 12:15:42,333 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-07-17 12:15:42,334 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-17 12:15:42,334 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-17 12:15:42,334 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand 3 states. [2020-07-17 12:15:42,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 12:15:42,369 INFO L93 Difference]: Finished difference Result 27 states and 29 transitions. [2020-07-17 12:15:42,370 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-17 12:15:42,370 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2020-07-17 12:15:42,370 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 12:15:42,371 INFO L225 Difference]: With dead ends: 27 [2020-07-17 12:15:42,371 INFO L226 Difference]: Without dead ends: 20 [2020-07-17 12:15:42,373 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-17 12:15:42,373 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-07-17 12:15:42,378 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-07-17 12:15:42,378 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-07-17 12:15:42,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2020-07-17 12:15:42,380 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 11 [2020-07-17 12:15:42,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 12:15:42,380 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2020-07-17 12:15:42,380 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-17 12:15:42,381 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2020-07-17 12:15:42,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-07-17 12:15:42,381 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 12:15:42,381 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 12:15:42,382 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-07-17 12:15:42,382 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 12:15:42,382 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 12:15:42,386 INFO L82 PathProgramCache]: Analyzing trace with hash 1463775831, now seen corresponding path program 1 times [2020-07-17 12:15:42,386 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-07-17 12:15:42,386 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1407470043] [2020-07-17 12:15:42,386 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 12:15:42,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 12:15:42,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 12:15:42,509 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-17 12:15:42,509 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1407470043] [2020-07-17 12:15:42,509 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-17 12:15:42,510 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-07-17 12:15:42,510 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1074451204] [2020-07-17 12:15:42,511 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-17 12:15:42,511 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-07-17 12:15:42,511 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-17 12:15:42,512 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-07-17 12:15:42,512 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 6 states. [2020-07-17 12:15:42,608 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 12:15:42,609 INFO L93 Difference]: Finished difference Result 28 states and 30 transitions. [2020-07-17 12:15:42,609 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-17 12:15:42,610 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 11 [2020-07-17 12:15:42,610 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 12:15:42,611 INFO L225 Difference]: With dead ends: 28 [2020-07-17 12:15:42,611 INFO L226 Difference]: Without dead ends: 26 [2020-07-17 12:15:42,612 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-07-17 12:15:42,613 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-07-17 12:15:42,621 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 24. [2020-07-17 12:15:42,622 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-07-17 12:15:42,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2020-07-17 12:15:42,623 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 11 [2020-07-17 12:15:42,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 12:15:42,624 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2020-07-17 12:15:42,624 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-17 12:15:42,624 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2020-07-17 12:15:42,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-17 12:15:42,625 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 12:15:42,625 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 12:15:42,626 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-07-17 12:15:42,626 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 12:15:42,626 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 12:15:42,626 INFO L82 PathProgramCache]: Analyzing trace with hash -541842987, now seen corresponding path program 1 times [2020-07-17 12:15:42,627 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-07-17 12:15:42,627 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1689673722] [2020-07-17 12:15:42,627 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 12:15:42,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 12:15:42,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 12:15:42,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 12:15:42,799 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-17 12:15:42,800 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1689673722] [2020-07-17 12:15:42,800 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-17 12:15:42,800 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-07-17 12:15:42,801 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1568631071] [2020-07-17 12:15:42,801 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-07-17 12:15:42,802 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-07-17 12:15:42,802 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-07-17 12:15:42,804 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-07-17 12:15:42,805 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 7 states. [2020-07-17 12:15:42,920 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 12:15:42,921 INFO L93 Difference]: Finished difference Result 32 states and 33 transitions. [2020-07-17 12:15:42,921 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-17 12:15:42,922 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 18 [2020-07-17 12:15:42,922 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 12:15:42,923 INFO L225 Difference]: With dead ends: 32 [2020-07-17 12:15:42,923 INFO L226 Difference]: Without dead ends: 28 [2020-07-17 12:15:42,924 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2020-07-17 12:15:42,925 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-17 12:15:42,931 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-07-17 12:15:42,931 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-17 12:15:42,932 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2020-07-17 12:15:42,932 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 18 [2020-07-17 12:15:42,933 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 12:15:42,933 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2020-07-17 12:15:42,933 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-07-17 12:15:42,933 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2020-07-17 12:15:42,934 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-17 12:15:42,934 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 12:15:42,935 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 12:15:42,935 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-07-17 12:15:42,935 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 12:15:42,936 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 12:15:42,936 INFO L82 PathProgramCache]: Analyzing trace with hash 814692392, now seen corresponding path program 1 times [2020-07-17 12:15:42,936 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-07-17 12:15:42,937 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1745149658] [2020-07-17 12:15:42,937 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 12:15:42,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-17 12:15:42,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-17 12:15:43,000 INFO L174 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-07-17 12:15:43,001 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-17 12:15:43,001 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-07-17 12:15:43,029 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 17.07 12:15:43 BoogieIcfgContainer [2020-07-17 12:15:43,029 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-17 12:15:43,032 INFO L168 Benchmark]: Toolchain (without parser) took 1774.45 ms. Allocated memory was 146.8 MB in the beginning and 203.9 MB in the end (delta: 57.1 MB). Free memory was 103.1 MB in the beginning and 98.2 MB in the end (delta: 4.9 MB). Peak memory consumption was 62.0 MB. Max. memory is 7.1 GB. [2020-07-17 12:15:43,033 INFO L168 Benchmark]: CDTParser took 0.23 ms. Allocated memory is still 146.8 MB. Free memory was 121.8 MB in the beginning and 121.6 MB in the end (delta: 209.9 kB). Peak memory consumption was 209.9 kB. Max. memory is 7.1 GB. [2020-07-17 12:15:43,034 INFO L168 Benchmark]: CACSL2BoogieTranslator took 252.59 ms. Allocated memory is still 146.8 MB. Free memory was 102.7 MB in the beginning and 92.9 MB in the end (delta: 9.8 MB). Peak memory consumption was 9.8 MB. Max. memory is 7.1 GB. [2020-07-17 12:15:43,035 INFO L168 Benchmark]: Boogie Preprocessor took 113.70 ms. Allocated memory was 146.8 MB in the beginning and 203.9 MB in the end (delta: 57.1 MB). Free memory was 92.9 MB in the beginning and 184.0 MB in the end (delta: -91.0 MB). Peak memory consumption was 11.3 MB. Max. memory is 7.1 GB. [2020-07-17 12:15:43,036 INFO L168 Benchmark]: RCFGBuilder took 285.94 ms. Allocated memory is still 203.9 MB. Free memory was 184.0 MB in the beginning and 169.9 MB in the end (delta: 14.1 MB). Peak memory consumption was 14.1 MB. Max. memory is 7.1 GB. [2020-07-17 12:15:43,037 INFO L168 Benchmark]: TraceAbstraction took 1116.70 ms. Allocated memory is still 203.9 MB. Free memory was 169.3 MB in the beginning and 98.8 MB in the end (delta: 70.5 MB). Peak memory consumption was 70.5 MB. Max. memory is 7.1 GB. [2020-07-17 12:15:43,041 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.23 ms. Allocated memory is still 146.8 MB. Free memory was 121.8 MB in the beginning and 121.6 MB in the end (delta: 209.9 kB). Peak memory consumption was 209.9 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 252.59 ms. Allocated memory is still 146.8 MB. Free memory was 102.7 MB in the beginning and 92.9 MB in the end (delta: 9.8 MB). Peak memory consumption was 9.8 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 113.70 ms. Allocated memory was 146.8 MB in the beginning and 203.9 MB in the end (delta: 57.1 MB). Free memory was 92.9 MB in the beginning and 184.0 MB in the end (delta: -91.0 MB). Peak memory consumption was 11.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 285.94 ms. Allocated memory is still 203.9 MB. Free memory was 184.0 MB in the beginning and 169.9 MB in the end (delta: 14.1 MB). Peak memory consumption was 14.1 MB. Max. memory is 7.1 GB. * TraceAbstraction took 1116.70 ms. Allocated memory is still 203.9 MB. Free memory was 169.3 MB in the beginning and 98.8 MB in the end (delta: 70.5 MB). Peak memory consumption was 70.5 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 9]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L17] int i=0, x=0, y=0; [L18] int n=__VERIFIER_nondet_int(); [L19] COND FALSE !(!(n>0)) [L20] i=0 VAL [i=0, n=1, x=0, y=0] [L20] COND TRUE i