/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 --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options interpolation-heuristic=FIRST --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/nec20.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 15:02:44,294 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-08-21 15:02:44,338 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 15:02:44,348 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 15:02:44,351 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 15:02:44,355 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 15:02:44,357 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 15:02:44,361 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 15:02:44,362 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 15:02:44,363 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 15:02:44,363 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 15:02:44,366 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 15:02:44,368 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 15:02:44,370 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 15:02:44,371 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 15:02:44,372 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 15:02:44,373 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 15:02:44,381 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 15:02:44,384 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 15:02:44,385 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 15:02:44,386 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 15:02:44,386 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 15:02:44,398 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-21 15:02:44,418 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 15:02:44,419 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 15:02:44,419 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 15:02:44,421 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-21 15:02:44,459 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 15:02:44,459 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 15:02:44,461 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 15:02:44,461 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 15:02:44,462 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 15:02:44,462 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 15:02:44,462 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 15:02:44,462 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 15:02:44,463 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 15:02:44,463 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 15:02:44,464 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 15:02:44,464 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 15:02:44,464 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 15:02:44,465 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 15:02:44,465 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 15:02:44,465 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 15:02:44,465 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 15:02:44,465 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 15:02:44,466 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 15:02:44,466 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 15:02:44,466 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 15:02:44,466 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 15:02:44,466 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 15:02:44,466 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 15:02:44,467 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 15:02:44,467 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 15:02:44,467 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 15:02:44,467 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 15:02:44,467 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 15:02:44,467 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> interpolation-heuristic=FIRST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> interpolation-heuristic=FIRST;log-additional-information=true; [2020-08-21 15:02:44,788 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 15:02:44,807 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 15:02:44,812 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 15:02:44,814 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 15:02:44,814 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 15:02:44,815 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/nec20.c [2020-08-21 15:02:44,889 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/c8fc3ddf4/07fe40aefcdb45fa8909c155438868e2/FLAGea56b88ce [2020-08-21 15:02:45,340 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 15:02:45,341 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loops/nec20.c [2020-08-21 15:02:45,348 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/c8fc3ddf4/07fe40aefcdb45fa8909c155438868e2/FLAGea56b88ce [2020-08-21 15:02:45,718 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/c8fc3ddf4/07fe40aefcdb45fa8909c155438868e2 [2020-08-21 15:02:45,728 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 15:02:45,730 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 15:02:45,732 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 15:02:45,733 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 15:02:45,736 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 15:02:45,737 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 03:02:45" (1/1) ... [2020-08-21 15:02:45,741 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@78523b67 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:02:45, skipping insertion in model container [2020-08-21 15:02:45,741 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 03:02:45" (1/1) ... [2020-08-21 15:02:45,750 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 15:02:45,769 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 15:02:45,960 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 15:02:45,964 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 15:02:45,980 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 15:02:45,994 INFO L208 MainTranslator]: Completed translation [2020-08-21 15:02:45,995 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:02:45 WrapperNode [2020-08-21 15:02:45,995 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 15:02:45,995 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 15:02:45,996 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 15:02:45,996 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 15:02:46,006 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:02:45" (1/1) ... [2020-08-21 15:02:46,006 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:02:45" (1/1) ... [2020-08-21 15:02:46,087 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:02:45" (1/1) ... [2020-08-21 15:02:46,087 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:02:45" (1/1) ... [2020-08-21 15:02:46,096 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:02:45" (1/1) ... [2020-08-21 15:02:46,103 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:02:45" (1/1) ... [2020-08-21 15:02:46,104 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:02:45" (1/1) ... [2020-08-21 15:02:46,105 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 15:02:46,106 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 15:02:46,106 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 15:02:46,106 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 15:02:46,107 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:02:45" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/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 [2020-08-21 15:02:46,170 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 15:02:46,170 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 15:02:46,170 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-21 15:02:46,170 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 15:02:46,170 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 15:02:46,171 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-08-21 15:02:46,171 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-21 15:02:46,171 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2020-08-21 15:02:46,171 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 15:02:46,171 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 15:02:46,171 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 15:02:46,385 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 15:02:46,385 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-21 15:02:46,389 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 03:02:46 BoogieIcfgContainer [2020-08-21 15:02:46,389 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 15:02:46,391 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 15:02:46,391 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 15:02:46,394 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 15:02:46,394 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 03:02:45" (1/3) ... [2020-08-21 15:02:46,395 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3cad20b4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 03:02:46, skipping insertion in model container [2020-08-21 15:02:46,395 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:02:45" (2/3) ... [2020-08-21 15:02:46,395 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3cad20b4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 03:02:46, skipping insertion in model container [2020-08-21 15:02:46,396 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 03:02:46" (3/3) ... [2020-08-21 15:02:46,397 INFO L109 eAbstractionObserver]: Analyzing ICFG nec20.c [2020-08-21 15:02:46,408 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 15:02:46,415 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 15:02:46,430 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 15:02:46,486 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 15:02:46,486 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 15:02:46,486 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 15:02:46,487 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 15:02:46,487 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 15:02:46,488 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 15:02:46,488 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 15:02:46,488 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 15:02:46,513 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states. [2020-08-21 15:02:46,519 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-21 15:02:46,520 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:02:46,521 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:02:46,521 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:02:46,528 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:02:46,529 INFO L82 PathProgramCache]: Analyzing trace with hash -676339564, now seen corresponding path program 1 times [2020-08-21 15:02:46,538 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:02:46,539 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [702281563] [2020-08-21 15:02:46,539 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:02:46,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:02:46,794 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:02:46,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:02:46,803 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:02:46,804 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [702281563] [2020-08-21 15:02:46,808 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 15:02:46,809 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 15:02:46,811 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2078476578] [2020-08-21 15:02:46,817 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 15:02:46,818 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:02:46,832 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 15:02:46,833 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 15:02:46,837 INFO L87 Difference]: Start difference. First operand 25 states. Second operand 5 states. [2020-08-21 15:02:47,039 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:02:47,040 INFO L93 Difference]: Finished difference Result 53 states and 68 transitions. [2020-08-21 15:02:47,040 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 15:02:47,042 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 15 [2020-08-21 15:02:47,042 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:02:47,052 INFO L225 Difference]: With dead ends: 53 [2020-08-21 15:02:47,053 INFO L226 Difference]: Without dead ends: 22 [2020-08-21 15:02:47,057 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-21 15:02:47,076 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-21 15:02:47,097 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 19. [2020-08-21 15:02:47,098 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-21 15:02:47,099 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2020-08-21 15:02:47,101 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 15 [2020-08-21 15:02:47,101 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:02:47,102 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2020-08-21 15:02:47,102 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 15:02:47,102 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2020-08-21 15:02:47,103 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-21 15:02:47,103 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:02:47,103 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:02:47,104 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 15:02:47,104 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:02:47,105 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:02:47,105 INFO L82 PathProgramCache]: Analyzing trace with hash 3718806, now seen corresponding path program 1 times [2020-08-21 15:02:47,105 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:02:47,106 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [500974640] [2020-08-21 15:02:47,106 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:02:47,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:02:47,285 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:02:47,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:02:47,291 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:02:47,291 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [500974640] [2020-08-21 15:02:47,292 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 15:02:47,292 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 15:02:47,292 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [57526305] [2020-08-21 15:02:47,294 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 15:02:47,294 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:02:47,295 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 15:02:47,295 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 15:02:47,295 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand 5 states. [2020-08-21 15:02:47,402 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:02:47,403 INFO L93 Difference]: Finished difference Result 29 states and 31 transitions. [2020-08-21 15:02:47,403 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 15:02:47,404 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 15 [2020-08-21 15:02:47,404 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:02:47,405 INFO L225 Difference]: With dead ends: 29 [2020-08-21 15:02:47,405 INFO L226 Difference]: Without dead ends: 23 [2020-08-21 15:02:47,406 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-21 15:02:47,407 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-21 15:02:47,412 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 17. [2020-08-21 15:02:47,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-21 15:02:47,413 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2020-08-21 15:02:47,413 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 15 [2020-08-21 15:02:47,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:02:47,414 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2020-08-21 15:02:47,414 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 15:02:47,414 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2020-08-21 15:02:47,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-21 15:02:47,415 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:02:47,416 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:02:47,416 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 15:02:47,416 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:02:47,417 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:02:47,417 INFO L82 PathProgramCache]: Analyzing trace with hash 2087974871, now seen corresponding path program 1 times [2020-08-21 15:02:47,417 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:02:47,417 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [89647888] [2020-08-21 15:02:47,418 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:02:47,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-21 15:02:47,438 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-21 15:02:47,438 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-21 15:02:47,443 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 15:02:47,460 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.08 03:02:47 BoogieIcfgContainer [2020-08-21 15:02:47,460 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-21 15:02:47,469 INFO L168 Benchmark]: Toolchain (without parser) took 1732.76 ms. Allocated memory was 141.0 MB in the beginning and 203.9 MB in the end (delta: 62.9 MB). Free memory was 104.2 MB in the beginning and 103.6 MB in the end (delta: 642.0 kB). Peak memory consumption was 63.6 MB. Max. memory is 7.1 GB. [2020-08-21 15:02:47,470 INFO L168 Benchmark]: CDTParser took 0.17 ms. Allocated memory is still 141.0 MB. Free memory was 122.6 MB in the beginning and 122.4 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. [2020-08-21 15:02:47,471 INFO L168 Benchmark]: CACSL2BoogieTranslator took 263.19 ms. Allocated memory is still 141.0 MB. Free memory was 103.8 MB in the beginning and 94.0 MB in the end (delta: 9.8 MB). Peak memory consumption was 9.8 MB. Max. memory is 7.1 GB. [2020-08-21 15:02:47,475 INFO L168 Benchmark]: Boogie Preprocessor took 109.99 ms. Allocated memory was 141.0 MB in the beginning and 203.9 MB in the end (delta: 62.9 MB). Free memory was 94.0 MB in the beginning and 182.0 MB in the end (delta: -88.0 MB). Peak memory consumption was 12.8 MB. Max. memory is 7.1 GB. [2020-08-21 15:02:47,476 INFO L168 Benchmark]: RCFGBuilder took 283.71 ms. Allocated memory is still 203.9 MB. Free memory was 182.0 MB in the beginning and 168.4 MB in the end (delta: 13.7 MB). Peak memory consumption was 13.7 MB. Max. memory is 7.1 GB. [2020-08-21 15:02:47,477 INFO L168 Benchmark]: TraceAbstraction took 1070.02 ms. Allocated memory is still 203.9 MB. Free memory was 168.4 MB in the beginning and 103.6 MB in the end (delta: 64.8 MB). Peak memory consumption was 64.8 MB. Max. memory is 7.1 GB. [2020-08-21 15:02:47,486 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.17 ms. Allocated memory is still 141.0 MB. Free memory was 122.6 MB in the beginning and 122.4 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 263.19 ms. Allocated memory is still 141.0 MB. Free memory was 103.8 MB in the beginning and 94.0 MB in the end (delta: 9.8 MB). Peak memory consumption was 9.8 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 109.99 ms. Allocated memory was 141.0 MB in the beginning and 203.9 MB in the end (delta: 62.9 MB). Free memory was 94.0 MB in the beginning and 182.0 MB in the end (delta: -88.0 MB). Peak memory consumption was 12.8 MB. Max. memory is 7.1 GB. * RCFGBuilder took 283.71 ms. Allocated memory is still 203.9 MB. Free memory was 182.0 MB in the beginning and 168.4 MB in the end (delta: 13.7 MB). Peak memory consumption was 13.7 MB. Max. memory is 7.1 GB. * TraceAbstraction took 1070.02 ms. Allocated memory is still 203.9 MB. Free memory was 168.4 MB in the beginning and 103.6 MB in the end (delta: 64.8 MB). Peak memory consumption was 64.8 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 6]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L10] int b; [L13] _Bool k=__VERIFIER_nondet_bool(); [L14] unsigned int i,n,j; [L15] int a[1025]; [L17] COND TRUE \read(k) [L18] n=0 [L23] i=0 [L24] j=__VERIFIER_nondet_uint() [L25] COND FALSE !(j > 10000) [L28] COND TRUE i <= n [L29] i++ [L30] j= j +2 [L28] COND FALSE !(i <= n) [L33] a[i]=0 [L34] CALL __VERIFIER_assert(j<1025) [L5] COND TRUE !(cond) [L6] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 25 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 0.9s, OverallIterations: 3, TraceHistogramMax: 1, AutomataDifference: 0.3s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 47 SDtfs, 53 SDslu, 37 SDs, 0 SdLazy, 86 SolverSat, 9 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 16 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=25occurred in iteration=0, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 2 MinimizatonAttempts, 9 StatesRemovedByMinimization, 2 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.3s InterpolantComputationTime, 46 NumberOfCodeBlocks, 46 NumberOfCodeBlocksAsserted, 3 NumberOfCheckSat, 28 ConstructedInterpolants, 0 QuantifiedInterpolants, 1792 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 2 InterpolantComputations, 2 PerfectInterpolantSequences, 0/0 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...