/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 0.1.25-86f66a4 [2020-07-07 11:32:40,160 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-07 11:32:40,163 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-07 11:32:40,181 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-07 11:32:40,182 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-07 11:32:40,183 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-07 11:32:40,184 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-07 11:32:40,186 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-07 11:32:40,188 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-07 11:32:40,188 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-07 11:32:40,189 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-07 11:32:40,190 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-07 11:32:40,191 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-07 11:32:40,192 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-07 11:32:40,193 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-07 11:32:40,194 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-07 11:32:40,195 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-07 11:32:40,196 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-07 11:32:40,197 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-07 11:32:40,199 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-07 11:32:40,201 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-07 11:32:40,202 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-07 11:32:40,204 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-07 11:32:40,204 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-07 11:32:40,207 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-07 11:32:40,215 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-07 11:32:40,216 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-07 11:32:40,217 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-07 11:32:40,217 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 [2020-07-07 11:32:40,235 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-07 11:32:40,235 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-07 11:32:40,236 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-07 11:32:40,236 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-07 11:32:40,237 INFO L138 SettingsManager]: * Use SBE=true [2020-07-07 11:32:40,237 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-07 11:32:40,237 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-07 11:32:40,237 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-07 11:32:40,238 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-07 11:32:40,238 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-07 11:32:40,238 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-07 11:32:40,238 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-07 11:32:40,238 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-07 11:32:40,238 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-07 11:32:40,239 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-07 11:32:40,239 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-07 11:32:40,239 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-07 11:32:40,239 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-07 11:32:40,240 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-07 11:32:40,240 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-07 11:32:40,240 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-07 11:32:40,240 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-07 11:32:40,240 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-07 11:32:40,241 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-07 11:32:40,241 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-07 11:32:40,241 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-07 11:32:40,241 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-07 11:32:40,241 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-07 11:32:40,242 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-07 11:32:40,242 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-07-07 11:32:40,519 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-07 11:32:40,535 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-07 11:32:40,539 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-07 11:32:40,540 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-07 11:32:40,541 INFO L275 PluginConnector]: CDTParser initialized [2020-07-07 11:32:40,541 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/for_bounded_loop1.c [2020-07-07 11:32:40,610 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0b7e29de5/491af7dce5af41e2894fc2f8b2b0fb34/FLAG61c177322 [2020-07-07 11:32:41,074 INFO L306 CDTParser]: Found 1 translation units. [2020-07-07 11:32:41,075 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/for_bounded_loop1.c [2020-07-07 11:32:41,080 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0b7e29de5/491af7dce5af41e2894fc2f8b2b0fb34/FLAG61c177322 [2020-07-07 11:32:41,477 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0b7e29de5/491af7dce5af41e2894fc2f8b2b0fb34 [2020-07-07 11:32:41,487 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-07 11:32:41,489 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-07 11:32:41,491 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-07 11:32:41,491 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-07 11:32:41,494 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-07 11:32:41,495 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.07 11:32:41" (1/1) ... [2020-07-07 11:32:41,498 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@430027b3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 11:32:41, skipping insertion in model container [2020-07-07 11:32:41,499 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.07 11:32:41" (1/1) ... [2020-07-07 11:32:41,506 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-07 11:32:41,524 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-07 11:32:41,697 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-07 11:32:41,704 INFO L203 MainTranslator]: Completed pre-run [2020-07-07 11:32:41,723 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-07 11:32:41,738 INFO L208 MainTranslator]: Completed translation [2020-07-07 11:32:41,738 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 11:32:41 WrapperNode [2020-07-07 11:32:41,738 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-07 11:32:41,739 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-07 11:32:41,739 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-07 11:32:41,739 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-07 11:32:41,753 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 11:32:41" (1/1) ... [2020-07-07 11:32:41,754 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 11:32:41" (1/1) ... [2020-07-07 11:32:41,842 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 11:32:41" (1/1) ... [2020-07-07 11:32:41,843 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 11:32:41" (1/1) ... [2020-07-07 11:32:41,847 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 11:32:41" (1/1) ... [2020-07-07 11:32:41,853 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 11:32:41" (1/1) ... [2020-07-07 11:32:41,860 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 11:32:41" (1/1) ... [2020-07-07 11:32:41,861 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-07 11:32:41,862 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-07 11:32:41,862 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-07 11:32:41,862 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-07 11:32:41,863 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 11:32:41" (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 [2020-07-07 11:32:41,930 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-07 11:32:41,930 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-07 11:32:41,930 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-07 11:32:41,931 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-07 11:32:41,931 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-07 11:32:41,931 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-07 11:32:41,931 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-07 11:32:41,931 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-07 11:32:41,932 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-07 11:32:41,932 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-07 11:32:41,932 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-07 11:32:41,933 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-07 11:32:41,933 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-07 11:32:42,123 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-07 11:32:42,124 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-07 11:32:42,128 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.07 11:32:42 BoogieIcfgContainer [2020-07-07 11:32:42,128 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-07 11:32:42,129 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-07 11:32:42,129 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-07 11:32:42,132 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-07 11:32:42,132 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.07 11:32:41" (1/3) ... [2020-07-07 11:32:42,133 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6de1024a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.07 11:32:42, skipping insertion in model container [2020-07-07 11:32:42,133 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.07 11:32:41" (2/3) ... [2020-07-07 11:32:42,134 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6de1024a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.07 11:32:42, skipping insertion in model container [2020-07-07 11:32:42,134 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.07 11:32:42" (3/3) ... [2020-07-07 11:32:42,136 INFO L109 eAbstractionObserver]: Analyzing ICFG for_bounded_loop1.c [2020-07-07 11:32:42,147 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-07-07 11:32:42,157 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-07 11:32:42,175 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-07 11:32:42,205 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-07 11:32:42,205 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-07 11:32:42,205 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-07-07 11:32:42,205 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-07 11:32:42,206 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-07 11:32:42,206 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-07 11:32:42,206 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-07 11:32:42,206 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-07 11:32:42,229 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states. [2020-07-07 11:32:42,236 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-07-07 11:32:42,236 INFO L414 BasicCegarLoop]: Found error trace [2020-07-07 11:32:42,237 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-07 11:32:42,238 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-07 11:32:42,245 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-07 11:32:42,248 INFO L82 PathProgramCache]: Analyzing trace with hash 1474053726, now seen corresponding path program 1 times [2020-07-07 11:32:42,266 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-07-07 11:32:42,268 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [532364123] [2020-07-07 11:32:42,269 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-07 11:32:42,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:32:42,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:32:42,395 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-07 11:32:42,395 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [532364123] [2020-07-07 11:32:42,396 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-07 11:32:42,396 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-07-07 11:32:42,397 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1033624562] [2020-07-07 11:32:42,402 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-07-07 11:32:42,403 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-07-07 11:32:42,417 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-07-07 11:32:42,418 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-07 11:32:42,420 INFO L87 Difference]: Start difference. First operand 23 states. Second operand 2 states. [2020-07-07 11:32:42,445 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-07 11:32:42,446 INFO L93 Difference]: Finished difference Result 40 states and 54 transitions. [2020-07-07 11:32:42,446 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-07-07 11:32:42,447 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 11 [2020-07-07 11:32:42,448 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-07 11:32:42,457 INFO L225 Difference]: With dead ends: 40 [2020-07-07 11:32:42,458 INFO L226 Difference]: Without dead ends: 19 [2020-07-07 11:32:42,462 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 [2020-07-07 11:32:42,481 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-07-07 11:32:42,501 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-07-07 11:32:42,503 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-07-07 11:32:42,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2020-07-07 11:32:42,507 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 11 [2020-07-07 11:32:42,507 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-07 11:32:42,507 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2020-07-07 11:32:42,507 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-07-07 11:32:42,508 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2020-07-07 11:32:42,508 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-07-07 11:32:42,509 INFO L414 BasicCegarLoop]: Found error trace [2020-07-07 11:32:42,509 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-07 11:32:42,509 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-07-07 11:32:42,510 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-07 11:32:42,510 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-07 11:32:42,510 INFO L82 PathProgramCache]: Analyzing trace with hash 1462047953, now seen corresponding path program 1 times [2020-07-07 11:32:42,511 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-07-07 11:32:42,511 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1720803768] [2020-07-07 11:32:42,511 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-07 11:32:42,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:32:42,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:32:42,574 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-07 11:32:42,574 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1720803768] [2020-07-07 11:32:42,575 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-07 11:32:42,575 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-07 11:32:42,576 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [905296088] [2020-07-07 11:32:42,578 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-07 11:32:42,578 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-07-07 11:32:42,579 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-07 11:32:42,579 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-07 11:32:42,579 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand 3 states. [2020-07-07 11:32:42,605 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-07 11:32:42,606 INFO L93 Difference]: Finished difference Result 27 states and 29 transitions. [2020-07-07 11:32:42,606 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-07 11:32:42,607 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2020-07-07 11:32:42,607 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-07 11:32:42,608 INFO L225 Difference]: With dead ends: 27 [2020-07-07 11:32:42,608 INFO L226 Difference]: Without dead ends: 20 [2020-07-07 11:32:42,610 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 [2020-07-07 11:32:42,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-07-07 11:32:42,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-07-07 11:32:42,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-07-07 11:32:42,619 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2020-07-07 11:32:42,619 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 11 [2020-07-07 11:32:42,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-07 11:32:42,620 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2020-07-07 11:32:42,620 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-07 11:32:42,620 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2020-07-07 11:32:42,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-07-07 11:32:42,621 INFO L414 BasicCegarLoop]: Found error trace [2020-07-07 11:32:42,621 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-07 11:32:42,621 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-07-07 11:32:42,622 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-07 11:32:42,622 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-07 11:32:42,622 INFO L82 PathProgramCache]: Analyzing trace with hash 1463775831, now seen corresponding path program 1 times [2020-07-07 11:32:42,623 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-07-07 11:32:42,623 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [436396805] [2020-07-07 11:32:42,623 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-07 11:32:42,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:32:42,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:32:42,750 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-07 11:32:42,751 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [436396805] [2020-07-07 11:32:42,751 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-07 11:32:42,751 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-07-07 11:32:42,752 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [874734379] [2020-07-07 11:32:42,752 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-07 11:32:42,752 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-07-07 11:32:42,753 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-07 11:32:42,753 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-07-07 11:32:42,753 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 6 states. [2020-07-07 11:32:42,890 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-07 11:32:42,891 INFO L93 Difference]: Finished difference Result 28 states and 30 transitions. [2020-07-07 11:32:42,891 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-07 11:32:42,892 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 11 [2020-07-07 11:32:42,892 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-07 11:32:42,893 INFO L225 Difference]: With dead ends: 28 [2020-07-07 11:32:42,893 INFO L226 Difference]: Without dead ends: 26 [2020-07-07 11:32:42,894 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 [2020-07-07 11:32:42,895 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-07-07 11:32:42,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 24. [2020-07-07 11:32:42,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-07-07 11:32:42,905 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2020-07-07 11:32:42,905 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 11 [2020-07-07 11:32:42,906 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-07 11:32:42,906 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2020-07-07 11:32:42,906 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-07 11:32:42,906 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2020-07-07 11:32:42,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-07 11:32:42,907 INFO L414 BasicCegarLoop]: Found error trace [2020-07-07 11:32:42,907 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-07 11:32:42,908 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-07-07 11:32:42,908 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-07 11:32:42,908 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-07 11:32:42,909 INFO L82 PathProgramCache]: Analyzing trace with hash -541842987, now seen corresponding path program 1 times [2020-07-07 11:32:42,909 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-07-07 11:32:42,909 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1631959244] [2020-07-07 11:32:42,910 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-07 11:32:42,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:32:43,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:32:43,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-07 11:32:43,095 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-07 11:32:43,096 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1631959244] [2020-07-07 11:32:43,096 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-07 11:32:43,096 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-07-07 11:32:43,097 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [966031273] [2020-07-07 11:32:43,097 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-07 11:32:43,098 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-07-07 11:32:43,098 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-07 11:32:43,098 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2020-07-07 11:32:43,099 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 8 states. [2020-07-07 11:32:43,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-07 11:32:43,229 INFO L93 Difference]: Finished difference Result 32 states and 33 transitions. [2020-07-07 11:32:43,229 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-07 11:32:43,230 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 18 [2020-07-07 11:32:43,230 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-07 11:32:43,231 INFO L225 Difference]: With dead ends: 32 [2020-07-07 11:32:43,231 INFO L226 Difference]: Without dead ends: 28 [2020-07-07 11:32:43,232 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 6 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2020-07-07 11:32:43,233 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-07 11:32:43,239 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-07-07 11:32:43,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-07 11:32:43,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2020-07-07 11:32:43,241 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 18 [2020-07-07 11:32:43,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-07 11:32:43,242 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2020-07-07 11:32:43,242 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-07 11:32:43,242 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2020-07-07 11:32:43,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-07 11:32:43,243 INFO L414 BasicCegarLoop]: Found error trace [2020-07-07 11:32:43,243 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] [2020-07-07 11:32:43,244 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-07-07 11:32:43,244 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-07 11:32:43,244 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-07 11:32:43,245 INFO L82 PathProgramCache]: Analyzing trace with hash 814692392, now seen corresponding path program 1 times [2020-07-07 11:32:43,245 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-07-07 11:32:43,245 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [291322416] [2020-07-07 11:32:43,245 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-07 11:32:43,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-07 11:32:43,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-07 11:32:43,336 INFO L174 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-07-07 11:32:43,338 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-07 11:32:43,339 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-07-07 11:32:43,373 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 07.07 11:32:43 BoogieIcfgContainer [2020-07-07 11:32:43,373 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-07 11:32:43,377 INFO L168 Benchmark]: Toolchain (without parser) took 1885.90 ms. Allocated memory was 143.7 MB in the beginning and 200.8 MB in the end (delta: 57.1 MB). Free memory was 101.1 MB in the beginning and 89.0 MB in the end (delta: 12.1 MB). Peak memory consumption was 69.3 MB. Max. memory is 7.1 GB. [2020-07-07 11:32:43,381 INFO L168 Benchmark]: CDTParser took 0.25 ms. Allocated memory is still 143.7 MB. Free memory was 119.9 MB in the beginning and 119.7 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-07-07 11:32:43,383 INFO L168 Benchmark]: CACSL2BoogieTranslator took 248.29 ms. Allocated memory is still 143.7 MB. Free memory was 100.9 MB in the beginning and 91.5 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. [2020-07-07 11:32:43,385 INFO L168 Benchmark]: Boogie Preprocessor took 122.25 ms. Allocated memory was 143.7 MB in the beginning and 200.8 MB in the end (delta: 57.1 MB). Free memory was 91.5 MB in the beginning and 179.5 MB in the end (delta: -88.0 MB). Peak memory consumption was 10.5 MB. Max. memory is 7.1 GB. [2020-07-07 11:32:43,392 INFO L168 Benchmark]: RCFGBuilder took 266.18 ms. Allocated memory is still 200.8 MB. Free memory was 178.8 MB in the beginning and 165.7 MB in the end (delta: 13.1 MB). Peak memory consumption was 13.1 MB. Max. memory is 7.1 GB. [2020-07-07 11:32:43,393 INFO L168 Benchmark]: TraceAbstraction took 1244.08 ms. Allocated memory is still 200.8 MB. Free memory was 165.7 MB in the beginning and 89.0 MB in the end (delta: 76.7 MB). Peak memory consumption was 76.7 MB. Max. memory is 7.1 GB. [2020-07-07 11:32:43,404 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.25 ms. Allocated memory is still 143.7 MB. Free memory was 119.9 MB in the beginning and 119.7 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 248.29 ms. Allocated memory is still 143.7 MB. Free memory was 100.9 MB in the beginning and 91.5 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 122.25 ms. Allocated memory was 143.7 MB in the beginning and 200.8 MB in the end (delta: 57.1 MB). Free memory was 91.5 MB in the beginning and 179.5 MB in the end (delta: -88.0 MB). Peak memory consumption was 10.5 MB. Max. memory is 7.1 GB. * RCFGBuilder took 266.18 ms. Allocated memory is still 200.8 MB. Free memory was 178.8 MB in the beginning and 165.7 MB in the end (delta: 13.1 MB). Peak memory consumption was 13.1 MB. Max. memory is 7.1 GB. * TraceAbstraction took 1244.08 ms. Allocated memory is still 200.8 MB. Free memory was 165.7 MB in the beginning and 89.0 MB in the end (delta: 76.7 MB). Peak memory consumption was 76.7 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