/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/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf -i ../../../trunk/examples/svcomp/recursive-simple/afterrec-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-72570d3 [2020-08-22 18:34:48,190 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-22 18:34:48,192 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-22 18:34:48,216 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-22 18:34:48,216 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-22 18:34:48,217 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-22 18:34:48,218 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-22 18:34:48,220 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-22 18:34:48,222 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-22 18:34:48,222 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-22 18:34:48,223 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-22 18:34:48,224 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-22 18:34:48,225 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-22 18:34:48,226 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-22 18:34:48,227 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-22 18:34:48,228 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-22 18:34:48,229 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-22 18:34:48,230 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-22 18:34:48,232 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-22 18:34:48,234 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-22 18:34:48,235 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-22 18:34:48,236 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-22 18:34:48,237 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-22 18:34:48,238 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-22 18:34:48,241 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-22 18:34:48,250 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-22 18:34:48,251 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-22 18:34:48,252 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-22 18:34:48,253 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf [2020-08-22 18:34:48,262 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-22 18:34:48,262 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-22 18:34:48,263 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-22 18:34:48,264 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-22 18:34:48,264 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-22 18:34:48,264 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-22 18:34:48,264 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-22 18:34:48,264 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-22 18:34:48,265 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-22 18:34:48,265 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-22 18:34:48,265 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-22 18:34:48,265 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-22 18:34:48,265 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-22 18:34:48,266 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-22 18:34:48,266 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-22 18:34:48,266 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-08-22 18:34:48,266 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-22 18:34:48,267 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-22 18:34:48,267 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-22 18:34:48,267 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-22 18:34:48,267 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-08-22 18:34:48,267 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-22 18:34:48,268 INFO L138 SettingsManager]: * Use separate solver for trace checks=false [2020-08-22 18:34:48,591 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-22 18:34:48,606 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-22 18:34:48,609 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-22 18:34:48,611 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-22 18:34:48,611 INFO L275 PluginConnector]: CDTParser initialized [2020-08-22 18:34:48,612 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/afterrec-1.c [2020-08-22 18:34:48,684 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/131e4ee5e/157a366cbf014614948d7c49e642b217/FLAG4e103ca24 [2020-08-22 18:34:49,161 INFO L306 CDTParser]: Found 1 translation units. [2020-08-22 18:34:49,162 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/afterrec-1.c [2020-08-22 18:34:49,167 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/131e4ee5e/157a366cbf014614948d7c49e642b217/FLAG4e103ca24 [2020-08-22 18:34:49,536 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/131e4ee5e/157a366cbf014614948d7c49e642b217 [2020-08-22 18:34:49,543 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-22 18:34:49,545 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-22 18:34:49,546 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-22 18:34:49,547 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-22 18:34:49,550 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-22 18:34:49,551 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 06:34:49" (1/1) ... [2020-08-22 18:34:49,554 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@774a9bb8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:34:49, skipping insertion in model container [2020-08-22 18:34:49,554 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 06:34:49" (1/1) ... [2020-08-22 18:34:49,561 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-22 18:34:49,578 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-22 18:34:49,752 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 18:34:49,757 INFO L203 MainTranslator]: Completed pre-run [2020-08-22 18:34:49,775 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 18:34:49,794 INFO L208 MainTranslator]: Completed translation [2020-08-22 18:34:49,795 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:34:49 WrapperNode [2020-08-22 18:34:49,796 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-22 18:34:49,797 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-22 18:34:49,797 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-22 18:34:49,797 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-22 18:34:49,814 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:34:49" (1/1) ... [2020-08-22 18:34:49,815 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:34:49" (1/1) ... [2020-08-22 18:34:49,820 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:34:49" (1/1) ... [2020-08-22 18:34:49,820 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:34:49" (1/1) ... [2020-08-22 18:34:49,900 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:34:49" (1/1) ... [2020-08-22 18:34:49,902 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:34:49" (1/1) ... [2020-08-22 18:34:49,904 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:34:49" (1/1) ... [2020-08-22 18:34:49,906 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-22 18:34:49,906 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-22 18:34:49,906 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-22 18:34:49,907 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-22 18:34:49,909 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:34:49" (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 [2020-08-22 18:34:49,987 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-22 18:34:49,987 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-22 18:34:49,988 INFO L138 BoogieDeclarations]: Found implementation of procedure f [2020-08-22 18:34:49,988 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-22 18:34:49,988 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-22 18:34:49,988 INFO L130 BoogieDeclarations]: Found specification of procedure f [2020-08-22 18:34:49,988 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-22 18:34:49,988 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-22 18:34:49,989 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-22 18:34:50,161 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-22 18:34:50,161 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-22 18:34:50,166 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 06:34:50 BoogieIcfgContainer [2020-08-22 18:34:50,166 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-22 18:34:50,170 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-22 18:34:50,170 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-22 18:34:50,173 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-22 18:34:50,174 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.08 06:34:49" (1/3) ... [2020-08-22 18:34:50,175 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5f3dc61c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 06:34:50, skipping insertion in model container [2020-08-22 18:34:50,176 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:34:49" (2/3) ... [2020-08-22 18:34:50,176 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5f3dc61c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 06:34:50, skipping insertion in model container [2020-08-22 18:34:50,177 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 06:34:50" (3/3) ... [2020-08-22 18:34:50,179 INFO L109 eAbstractionObserver]: Analyzing ICFG afterrec-1.c [2020-08-22 18:34:50,190 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-22 18:34:50,198 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-22 18:34:50,212 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-22 18:34:50,238 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-22 18:34:50,239 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-22 18:34:50,239 INFO L377 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2020-08-22 18:34:50,239 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-22 18:34:50,239 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-22 18:34:50,239 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-22 18:34:50,239 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-22 18:34:50,240 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-22 18:34:50,252 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2020-08-22 18:34:50,261 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-22 18:34:50,262 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 18:34:50,263 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 18:34:50,263 INFO L427 AbstractCegarLoop]: === Iteration 1 === [fErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 18:34:50,270 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 18:34:50,270 INFO L82 PathProgramCache]: Analyzing trace with hash -611063963, now seen corresponding path program 1 times [2020-08-22 18:34:50,279 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 18:34:50,280 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [12679361] [2020-08-22 18:34:50,280 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 18:34:50,336 INFO L288 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-08-22 18:34:50,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 18:34:50,475 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 18:34:50,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 18:34:50,480 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-22 18:34:50,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 18:34:50,538 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 18:34:50,541 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [12679361] [2020-08-22 18:34:50,542 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 18:34:50,543 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-08-22 18:34:50,543 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1458424060] [2020-08-22 18:34:50,549 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-22 18:34:50,550 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 18:34:50,574 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-22 18:34:50,576 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-08-22 18:34:50,578 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 8 states. [2020-08-22 18:34:50,801 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 18:34:50,802 INFO L93 Difference]: Finished difference Result 29 states and 33 transitions. [2020-08-22 18:34:50,803 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-22 18:34:50,804 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 16 [2020-08-22 18:34:50,805 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 18:34:50,817 INFO L225 Difference]: With dead ends: 29 [2020-08-22 18:34:50,817 INFO L226 Difference]: Without dead ends: 21 [2020-08-22 18:34:50,827 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=51, Invalid=131, Unknown=0, NotChecked=0, Total=182 [2020-08-22 18:34:50,845 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-22 18:34:50,865 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-22 18:34:50,866 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-22 18:34:50,868 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2020-08-22 18:34:50,869 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 16 [2020-08-22 18:34:50,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 18:34:50,870 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2020-08-22 18:34:50,871 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-22 18:34:50,871 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2020-08-22 18:34:50,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-22 18:34:50,872 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 18:34:50,872 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 18:34:50,873 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-22 18:34:50,873 INFO L427 AbstractCegarLoop]: === Iteration 2 === [fErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 18:34:50,873 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 18:34:50,874 INFO L82 PathProgramCache]: Analyzing trace with hash 1633986229, now seen corresponding path program 2 times [2020-08-22 18:34:50,874 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 18:34:50,875 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [840530493] [2020-08-22 18:34:50,875 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 18:34:50,877 INFO L288 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-08-22 18:34:50,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-22 18:34:50,892 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-08-22 18:34:50,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-22 18:34:50,908 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-08-22 18:34:50,927 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-22 18:34:50,927 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-22 18:34:50,928 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-22 18:34:50,942 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.08 06:34:50 BoogieIcfgContainer [2020-08-22 18:34:50,943 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-22 18:34:50,946 INFO L168 Benchmark]: Toolchain (without parser) took 1399.64 ms. Allocated memory was 137.4 MB in the beginning and 199.8 MB in the end (delta: 62.4 MB). Free memory was 101.2 MB in the beginning and 122.7 MB in the end (delta: -21.4 MB). Peak memory consumption was 40.9 MB. Max. memory is 7.1 GB. [2020-08-22 18:34:50,947 INFO L168 Benchmark]: CDTParser took 0.20 ms. Allocated memory is still 137.4 MB. Free memory was 119.9 MB in the beginning and 119.7 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. [2020-08-22 18:34:50,948 INFO L168 Benchmark]: CACSL2BoogieTranslator took 249.79 ms. Allocated memory is still 137.4 MB. Free memory was 101.0 MB in the beginning and 92.1 MB in the end (delta: 8.9 MB). Peak memory consumption was 8.9 MB. Max. memory is 7.1 GB. [2020-08-22 18:34:50,949 INFO L168 Benchmark]: Boogie Preprocessor took 109.30 ms. Allocated memory was 137.4 MB in the beginning and 199.8 MB in the end (delta: 62.4 MB). Free memory was 92.1 MB in the beginning and 178.9 MB in the end (delta: -86.8 MB). Peak memory consumption was 14.0 MB. Max. memory is 7.1 GB. [2020-08-22 18:34:50,950 INFO L168 Benchmark]: RCFGBuilder took 259.63 ms. Allocated memory is still 199.8 MB. Free memory was 178.9 MB in the beginning and 168.0 MB in the end (delta: 10.9 MB). Peak memory consumption was 10.9 MB. Max. memory is 7.1 GB. [2020-08-22 18:34:50,951 INFO L168 Benchmark]: TraceAbstraction took 772.84 ms. Allocated memory is still 199.8 MB. Free memory was 167.0 MB in the beginning and 122.7 MB in the end (delta: 44.4 MB). Peak memory consumption was 44.4 MB. Max. memory is 7.1 GB. [2020-08-22 18:34:50,954 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.20 ms. Allocated memory is still 137.4 MB. Free memory was 119.9 MB in the beginning and 119.7 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 249.79 ms. Allocated memory is still 137.4 MB. Free memory was 101.0 MB in the beginning and 92.1 MB in the end (delta: 8.9 MB). Peak memory consumption was 8.9 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 109.30 ms. Allocated memory was 137.4 MB in the beginning and 199.8 MB in the end (delta: 62.4 MB). Free memory was 92.1 MB in the beginning and 178.9 MB in the end (delta: -86.8 MB). Peak memory consumption was 14.0 MB. Max. memory is 7.1 GB. * RCFGBuilder took 259.63 ms. Allocated memory is still 199.8 MB. Free memory was 178.9 MB in the beginning and 168.0 MB in the end (delta: 10.9 MB). Peak memory consumption was 10.9 MB. Max. memory is 7.1 GB. * TraceAbstraction took 772.84 ms. Allocated memory is still 199.8 MB. Free memory was 167.0 MB in the beginning and 122.7 MB in the end (delta: 44.4 MB). Peak memory consumption was 44.4 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 7]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L11] CALL f(4) [L4] COND FALSE !(n<3) [L5] n-- [L6] CALL f(n) [L4] COND FALSE !(n<3) [L5] n-- [L6] CALL f(n) [L4] COND TRUE n<3 [L6] RET f(n) [L7] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 19 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 0.6s, OverallIterations: 2, TraceHistogramMax: 3, AutomataDifference: 0.2s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 9 SDtfs, 13 SDslu, 43 SDs, 0 SdLazy, 43 SolverSat, 5 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 17 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=21occurred in iteration=1, 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, 1 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: No data available, 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...