/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/id_o3.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-3af5e1f [2020-09-04 16:30:40,065 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-09-04 16:30:40,068 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-09-04 16:30:40,095 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-09-04 16:30:40,095 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-09-04 16:30:40,096 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-09-04 16:30:40,098 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-09-04 16:30:40,100 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-09-04 16:30:40,101 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-09-04 16:30:40,102 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-09-04 16:30:40,103 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-09-04 16:30:40,104 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-09-04 16:30:40,105 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-09-04 16:30:40,106 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-09-04 16:30:40,107 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-09-04 16:30:40,108 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-09-04 16:30:40,109 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-09-04 16:30:40,110 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-09-04 16:30:40,111 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-09-04 16:30:40,113 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-09-04 16:30:40,115 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-09-04 16:30:40,116 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-09-04 16:30:40,118 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-09-04 16:30:40,119 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-09-04 16:30:40,125 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-09-04 16:30:40,139 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-09-04 16:30:40,141 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-09-04 16:30:40,143 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-09-04 16:30:40,144 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf [2020-09-04 16:30:40,174 INFO L113 SettingsManager]: Loading preferences was successful [2020-09-04 16:30:40,174 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-09-04 16:30:40,176 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-09-04 16:30:40,176 INFO L138 SettingsManager]: * sizeof long=4 [2020-09-04 16:30:40,177 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-09-04 16:30:40,177 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-09-04 16:30:40,177 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-09-04 16:30:40,177 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-09-04 16:30:40,177 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-09-04 16:30:40,178 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-09-04 16:30:40,178 INFO L138 SettingsManager]: * sizeof long double=12 [2020-09-04 16:30:40,178 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-09-04 16:30:40,178 INFO L138 SettingsManager]: * Use constant arrays=true [2020-09-04 16:30:40,178 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-09-04 16:30:40,179 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-09-04 16:30:40,180 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-09-04 16:30:40,180 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-09-04 16:30:40,180 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-09-04 16:30:40,181 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-04 16:30:40,181 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-09-04 16:30:40,181 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-09-04 16:30:40,182 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-09-04 16:30:40,182 INFO L138 SettingsManager]: * Use separate solver for trace checks=false [2020-09-04 16:30:40,647 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-09-04 16:30:40,670 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-09-04 16:30:40,674 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-09-04 16:30:40,676 INFO L271 PluginConnector]: Initializing CDTParser... [2020-09-04 16:30:40,677 INFO L275 PluginConnector]: CDTParser initialized [2020-09-04 16:30:40,678 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id_o3.c [2020-09-04 16:30:40,770 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/8ae327b20/aacd774a52f349bdbd392e591f0d12bc/FLAG98394caea [2020-09-04 16:30:41,357 INFO L306 CDTParser]: Found 1 translation units. [2020-09-04 16:30:41,358 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/recursive-simple/id_o3.c [2020-09-04 16:30:41,364 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/8ae327b20/aacd774a52f349bdbd392e591f0d12bc/FLAG98394caea [2020-09-04 16:30:41,690 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/8ae327b20/aacd774a52f349bdbd392e591f0d12bc [2020-09-04 16:30:41,707 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-09-04 16:30:41,710 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-09-04 16:30:41,711 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-09-04 16:30:41,711 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-09-04 16:30:41,716 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-09-04 16:30:41,717 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 04.09 04:30:41" (1/1) ... [2020-09-04 16:30:41,721 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@9f26f4b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 04:30:41, skipping insertion in model container [2020-09-04 16:30:41,721 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 04.09 04:30:41" (1/1) ... [2020-09-04 16:30:41,731 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-09-04 16:30:41,758 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-09-04 16:30:41,973 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-04 16:30:41,978 INFO L203 MainTranslator]: Completed pre-run [2020-09-04 16:30:41,997 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-04 16:30:42,015 INFO L208 MainTranslator]: Completed translation [2020-09-04 16:30:42,016 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 04:30:42 WrapperNode [2020-09-04 16:30:42,016 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-09-04 16:30:42,017 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-09-04 16:30:42,017 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-09-04 16:30:42,017 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-09-04 16:30:42,033 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 04:30:42" (1/1) ... [2020-09-04 16:30:42,034 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 04:30:42" (1/1) ... [2020-09-04 16:30:42,039 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 04:30:42" (1/1) ... [2020-09-04 16:30:42,039 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 04:30:42" (1/1) ... [2020-09-04 16:30:42,042 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 04:30:42" (1/1) ... [2020-09-04 16:30:42,045 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 04:30:42" (1/1) ... [2020-09-04 16:30:42,046 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 04:30:42" (1/1) ... [2020-09-04 16:30:42,048 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-09-04 16:30:42,048 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-09-04 16:30:42,049 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-09-04 16:30:42,049 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-09-04 16:30:42,050 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 04:30:42" (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 [2020-09-04 16:30:42,220 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-09-04 16:30:42,221 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-09-04 16:30:42,221 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-09-04 16:30:42,221 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-09-04 16:30:42,221 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-09-04 16:30:42,221 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-09-04 16:30:42,222 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-09-04 16:30:42,222 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-09-04 16:30:42,222 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-09-04 16:30:42,222 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-09-04 16:30:42,408 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-09-04 16:30:42,409 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-09-04 16:30:42,413 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 04.09 04:30:42 BoogieIcfgContainer [2020-09-04 16:30:42,413 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-09-04 16:30:42,415 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-09-04 16:30:42,415 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-09-04 16:30:42,419 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-09-04 16:30:42,419 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 04.09 04:30:41" (1/3) ... [2020-09-04 16:30:42,421 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@c513c93 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 04.09 04:30:42, skipping insertion in model container [2020-09-04 16:30:42,421 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 04:30:42" (2/3) ... [2020-09-04 16:30:42,422 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@c513c93 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 04.09 04:30:42, skipping insertion in model container [2020-09-04 16:30:42,422 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 04.09 04:30:42" (3/3) ... [2020-09-04 16:30:42,424 INFO L109 eAbstractionObserver]: Analyzing ICFG id_o3.c [2020-09-04 16:30:42,436 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-09-04 16:30:42,446 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-09-04 16:30:42,466 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-09-04 16:30:42,497 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-09-04 16:30:42,497 INFO L376 AbstractCegarLoop]: Hoare is true [2020-09-04 16:30:42,497 INFO L377 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2020-09-04 16:30:42,497 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-09-04 16:30:42,498 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-09-04 16:30:42,498 INFO L380 AbstractCegarLoop]: Difference is false [2020-09-04 16:30:42,498 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-09-04 16:30:42,498 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-09-04 16:30:42,517 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2020-09-04 16:30:42,531 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-09-04 16:30:42,531 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 16:30:42,533 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 16:30:42,533 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 16:30:42,541 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 16:30:42,542 INFO L82 PathProgramCache]: Analyzing trace with hash -1651991454, now seen corresponding path program 1 times [2020-09-04 16:30:42,553 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 16:30:42,553 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1422791914] [2020-09-04 16:30:42,554 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 16:30:42,623 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 16:30:42,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:30:42,820 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 16:30:42,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:30:42,826 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-04 16:30:42,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:30:42,959 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 16:30:42,962 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1422791914] [2020-09-04 16:30:42,965 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 16:30:42,965 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-09-04 16:30:42,966 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1844329276] [2020-09-04 16:30:42,973 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-09-04 16:30:42,973 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 16:30:42,992 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-09-04 16:30:43,002 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-09-04 16:30:43,006 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 5 states. [2020-09-04 16:30:43,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 16:30:43,095 INFO L93 Difference]: Finished difference Result 37 states and 40 transitions. [2020-09-04 16:30:43,096 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-09-04 16:30:43,097 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 16 [2020-09-04 16:30:43,098 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 16:30:43,113 INFO L225 Difference]: With dead ends: 37 [2020-09-04 16:30:43,113 INFO L226 Difference]: Without dead ends: 22 [2020-09-04 16:30:43,118 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-09-04 16:30:43,136 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-09-04 16:30:43,164 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-09-04 16:30:43,166 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-09-04 16:30:43,167 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 23 transitions. [2020-09-04 16:30:43,169 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 23 transitions. Word has length 16 [2020-09-04 16:30:43,170 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 16:30:43,170 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 23 transitions. [2020-09-04 16:30:43,170 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-09-04 16:30:43,170 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 23 transitions. [2020-09-04 16:30:43,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-09-04 16:30:43,173 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 16:30:43,173 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 16:30:43,173 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-09-04 16:30:43,174 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 16:30:43,174 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 16:30:43,174 INFO L82 PathProgramCache]: Analyzing trace with hash 189324707, now seen corresponding path program 1 times [2020-09-04 16:30:43,174 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 16:30:43,175 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [51873057] [2020-09-04 16:30:43,175 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 16:30:43,177 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 16:30:43,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:30:43,284 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 16:30:43,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:30:43,288 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-04 16:30:43,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:30:43,351 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-09-04 16:30:43,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:30:43,400 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-09-04 16:30:43,400 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [51873057] [2020-09-04 16:30:43,401 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 16:30:43,401 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-09-04 16:30:43,401 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [20929737] [2020-09-04 16:30:43,402 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-09-04 16:30:43,403 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 16:30:43,403 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-09-04 16:30:43,404 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-09-04 16:30:43,404 INFO L87 Difference]: Start difference. First operand 22 states and 23 transitions. Second operand 7 states. [2020-09-04 16:30:43,482 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 16:30:43,482 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2020-09-04 16:30:43,483 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-09-04 16:30:43,483 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 23 [2020-09-04 16:30:43,483 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 16:30:43,485 INFO L225 Difference]: With dead ends: 31 [2020-09-04 16:30:43,485 INFO L226 Difference]: Without dead ends: 26 [2020-09-04 16:30:43,487 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2020-09-04 16:30:43,488 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-09-04 16:30:43,495 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-09-04 16:30:43,495 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-09-04 16:30:43,496 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 27 transitions. [2020-09-04 16:30:43,497 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 27 transitions. Word has length 23 [2020-09-04 16:30:43,497 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 16:30:43,497 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 27 transitions. [2020-09-04 16:30:43,497 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-09-04 16:30:43,498 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 27 transitions. [2020-09-04 16:30:43,499 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-09-04 16:30:43,499 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 16:30:43,499 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 16:30:43,499 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-09-04 16:30:43,499 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 16:30:43,500 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 16:30:43,500 INFO L82 PathProgramCache]: Analyzing trace with hash -1416732684, now seen corresponding path program 2 times [2020-09-04 16:30:43,500 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 16:30:43,501 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1067167717] [2020-09-04 16:30:43,501 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 16:30:43,503 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 16:30:43,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:30:43,609 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 16:30:43,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:30:43,613 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-09-04 16:30:43,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:30:43,711 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-09-04 16:30:43,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:30:43,790 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-09-04 16:30:43,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 16:30:43,853 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-09-04 16:30:43,855 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1067167717] [2020-09-04 16:30:43,855 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 16:30:43,856 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2020-09-04 16:30:43,857 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [422803840] [2020-09-04 16:30:43,857 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-09-04 16:30:43,858 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 16:30:43,858 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-09-04 16:30:43,859 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-09-04 16:30:43,861 INFO L87 Difference]: Start difference. First operand 26 states and 27 transitions. Second operand 9 states. [2020-09-04 16:30:44,011 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 16:30:44,011 INFO L93 Difference]: Finished difference Result 35 states and 36 transitions. [2020-09-04 16:30:44,012 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-09-04 16:30:44,012 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 30 [2020-09-04 16:30:44,013 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 16:30:44,014 INFO L225 Difference]: With dead ends: 35 [2020-09-04 16:30:44,014 INFO L226 Difference]: Without dead ends: 30 [2020-09-04 16:30:44,015 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2020-09-04 16:30:44,015 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-09-04 16:30:44,023 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-09-04 16:30:44,023 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-09-04 16:30:44,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2020-09-04 16:30:44,025 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 30 [2020-09-04 16:30:44,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 16:30:44,025 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2020-09-04 16:30:44,026 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-09-04 16:30:44,026 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2020-09-04 16:30:44,027 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-09-04 16:30:44,027 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 16:30:44,028 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 16:30:44,028 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-09-04 16:30:44,028 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 16:30:44,028 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 16:30:44,029 INFO L82 PathProgramCache]: Analyzing trace with hash -209476043, now seen corresponding path program 3 times [2020-09-04 16:30:44,029 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 16:30:44,029 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [730184501] [2020-09-04 16:30:44,029 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 16:30:44,031 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 16:30:44,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-09-04 16:30:44,062 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-09-04 16:30:44,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-09-04 16:30:44,105 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-09-04 16:30:44,140 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-09-04 16:30:44,141 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-09-04 16:30:44,142 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-09-04 16:30:44,170 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 04.09 04:30:44 BoogieIcfgContainer [2020-09-04 16:30:44,172 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-09-04 16:30:44,177 INFO L168 Benchmark]: Toolchain (without parser) took 2464.95 ms. Allocated memory was 145.8 MB in the beginning and 235.4 MB in the end (delta: 89.7 MB). Free memory was 103.3 MB in the beginning and 195.4 MB in the end (delta: -92.2 MB). There was no memory consumed. Max. memory is 7.1 GB. [2020-09-04 16:30:44,180 INFO L168 Benchmark]: CDTParser took 0.31 ms. Allocated memory is still 145.8 MB. Free memory was 121.3 MB in the beginning and 120.9 MB in the end (delta: 419.4 kB). Peak memory consumption was 419.4 kB. Max. memory is 7.1 GB. [2020-09-04 16:30:44,181 INFO L168 Benchmark]: CACSL2BoogieTranslator took 305.23 ms. Allocated memory is still 145.8 MB. Free memory was 102.8 MB in the beginning and 93.8 MB in the end (delta: 9.0 MB). Peak memory consumption was 9.0 MB. Max. memory is 7.1 GB. [2020-09-04 16:30:44,182 INFO L168 Benchmark]: Boogie Preprocessor took 31.35 ms. Allocated memory is still 145.8 MB. Free memory was 93.8 MB in the beginning and 92.1 MB in the end (delta: 1.7 MB). Peak memory consumption was 1.7 MB. Max. memory is 7.1 GB. [2020-09-04 16:30:44,184 INFO L168 Benchmark]: RCFGBuilder took 365.21 ms. Allocated memory was 145.8 MB in the beginning and 202.4 MB in the end (delta: 56.6 MB). Free memory was 92.1 MB in the beginning and 170.3 MB in the end (delta: -78.2 MB). Peak memory consumption was 10.0 MB. Max. memory is 7.1 GB. [2020-09-04 16:30:44,191 INFO L168 Benchmark]: TraceAbstraction took 1757.11 ms. Allocated memory was 202.4 MB in the beginning and 235.4 MB in the end (delta: 33.0 MB). Free memory was 170.3 MB in the beginning and 195.4 MB in the end (delta: -25.1 MB). Peak memory consumption was 7.9 MB. Max. memory is 7.1 GB. [2020-09-04 16:30:44,202 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.31 ms. Allocated memory is still 145.8 MB. Free memory was 121.3 MB in the beginning and 120.9 MB in the end (delta: 419.4 kB). Peak memory consumption was 419.4 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 305.23 ms. Allocated memory is still 145.8 MB. Free memory was 102.8 MB in the beginning and 93.8 MB in the end (delta: 9.0 MB). Peak memory consumption was 9.0 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 31.35 ms. Allocated memory is still 145.8 MB. Free memory was 93.8 MB in the beginning and 92.1 MB in the end (delta: 1.7 MB). Peak memory consumption was 1.7 MB. Max. memory is 7.1 GB. * RCFGBuilder took 365.21 ms. Allocated memory was 145.8 MB in the beginning and 202.4 MB in the end (delta: 56.6 MB). Free memory was 92.1 MB in the beginning and 170.3 MB in the end (delta: -78.2 MB). Peak memory consumption was 10.0 MB. Max. memory is 7.1 GB. * TraceAbstraction took 1757.11 ms. Allocated memory was 202.4 MB in the beginning and 235.4 MB in the end (delta: 33.0 MB). Free memory was 170.3 MB in the beginning and 195.4 MB in the end (delta: -25.1 MB). Peak memory consumption was 7.9 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 13]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L10] unsigned int input = __VERIFIER_nondet_uint(); [L11] CALL, EXPR id(input) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND TRUE x==0 [L5] return 0; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L11] RET, EXPR id(input) [L11] unsigned int result = id(input); [L12] COND TRUE result == 3 [L13] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 24 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 1.6s, OverallIterations: 4, TraceHistogramMax: 4, AutomataDifference: 0.3s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 68 SDtfs, 8 SDslu, 309 SDs, 0 SdLazy, 60 SolverSat, 0 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 45 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.5s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=30occurred in iteration=3, 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, 3 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...