/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.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/id2_i5_o5-1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.0-b8ad66e [2020-10-23 20:27:00,947 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-23 20:27:00,952 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-23 20:27:00,994 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-10-23 20:27:01,007 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-23 20:27:01,008 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-23 20:27:01,009 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-23 20:27:01,011 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-23 20:27:01,012 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-23 20:27:01,013 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-23 20:27:01,015 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-23 20:27:01,018 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-23 20:27:01,019 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-23 20:27:01,021 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-23 20:27:01,023 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-23 20:27:01,024 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-23 20:27:01,027 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-10-23 20:27:01,051 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf [2020-10-23 20:27:01,063 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-23 20:27:01,064 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-23 20:27:01,065 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-23 20:27:01,066 INFO L138 SettingsManager]: * sizeof long=4 [2020-10-23 20:27:01,066 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-23 20:27:01,066 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-10-23 20:27:01,066 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-23 20:27:01,066 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-10-23 20:27:01,067 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-10-23 20:27:01,067 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-10-23 20:27:01,067 INFO L138 SettingsManager]: * sizeof long double=12 [2020-10-23 20:27:01,067 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-23 20:27:01,067 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-23 20:27:01,068 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-10-23 20:27:01,068 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-23 20:27:01,068 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-10-23 20:27:01,068 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-10-23 20:27:01,068 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-10-23 20:27:01,069 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-23 20:27:01,069 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-23 20:27:01,069 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-10-23 20:27:01,069 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-10-23 20:27:01,069 INFO L138 SettingsManager]: * Use separate solver for trace checks=false WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-10-23 20:27:01,435 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-23 20:27:01,460 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-23 20:27:01,463 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-23 20:27:01,464 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-23 20:27:01,465 INFO L275 PluginConnector]: CDTParser initialized [2020-10-23 20:27:01,466 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id2_i5_o5-1.c [2020-10-23 20:27:01,551 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/69f4e02c8/15cf219ace934d8ab5be23f59baca71c/FLAGd47ca8939 [2020-10-23 20:27:02,116 INFO L306 CDTParser]: Found 1 translation units. [2020-10-23 20:27:02,117 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/id2_i5_o5-1.c [2020-10-23 20:27:02,124 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/69f4e02c8/15cf219ace934d8ab5be23f59baca71c/FLAGd47ca8939 [2020-10-23 20:27:02,503 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/69f4e02c8/15cf219ace934d8ab5be23f59baca71c [2020-10-23 20:27:02,506 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-23 20:27:02,517 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-10-23 20:27:02,522 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-23 20:27:02,522 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-23 20:27:02,526 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-23 20:27:02,527 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.10 08:27:02" (1/1) ... [2020-10-23 20:27:02,532 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2228acf9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 08:27:02, skipping insertion in model container [2020-10-23 20:27:02,532 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.10 08:27:02" (1/1) ... [2020-10-23 20:27:02,542 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-23 20:27:02,559 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-23 20:27:02,722 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-23 20:27:02,735 INFO L203 MainTranslator]: Completed pre-run [2020-10-23 20:27:02,754 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-23 20:27:02,772 INFO L208 MainTranslator]: Completed translation [2020-10-23 20:27:02,772 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 08:27:02 WrapperNode [2020-10-23 20:27:02,773 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-23 20:27:02,774 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-23 20:27:02,774 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-23 20:27:02,774 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-23 20:27:02,789 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 08:27:02" (1/1) ... [2020-10-23 20:27:02,789 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 08:27:02" (1/1) ... [2020-10-23 20:27:02,797 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 08:27:02" (1/1) ... [2020-10-23 20:27:02,798 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 08:27:02" (1/1) ... [2020-10-23 20:27:02,804 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 08:27:02" (1/1) ... [2020-10-23 20:27:02,806 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 08:27:02" (1/1) ... [2020-10-23 20:27:02,807 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 08:27:02" (1/1) ... [2020-10-23 20:27:02,809 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-23 20:27:02,811 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-23 20:27:02,811 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-23 20:27:02,811 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-23 20:27:02,812 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 08:27:02" (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 [2020-10-23 20:27:02,900 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-10-23 20:27:02,901 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-23 20:27:02,901 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2020-10-23 20:27:02,901 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-10-23 20:27:02,902 INFO L138 BoogieDeclarations]: Found implementation of procedure id2 [2020-10-23 20:27:02,902 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-10-23 20:27:02,902 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-10-23 20:27:02,902 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-10-23 20:27:02,903 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2020-10-23 20:27:02,903 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2020-10-23 20:27:02,903 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-10-23 20:27:02,903 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-10-23 20:27:02,904 INFO L130 BoogieDeclarations]: Found specification of procedure id2 [2020-10-23 20:27:02,904 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-10-23 20:27:02,904 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-10-23 20:27:02,904 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-10-23 20:27:02,905 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-23 20:27:02,905 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-10-23 20:27:02,905 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-10-23 20:27:02,905 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-10-23 20:27:03,295 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-23 20:27:03,295 INFO L298 CfgBuilder]: Removed 0 assume(true) statements. [2020-10-23 20:27:03,297 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.10 08:27:03 BoogieIcfgContainer [2020-10-23 20:27:03,298 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-23 20:27:03,300 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-10-23 20:27:03,300 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-10-23 20:27:03,303 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-10-23 20:27:03,304 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.10 08:27:02" (1/3) ... [2020-10-23 20:27:03,305 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@52683d6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.10 08:27:03, skipping insertion in model container [2020-10-23 20:27:03,305 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 08:27:02" (2/3) ... [2020-10-23 20:27:03,305 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@52683d6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.10 08:27:03, skipping insertion in model container [2020-10-23 20:27:03,306 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.10 08:27:03" (3/3) ... [2020-10-23 20:27:03,308 INFO L111 eAbstractionObserver]: Analyzing ICFG id2_i5_o5-1.c [2020-10-23 20:27:03,344 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-10-23 20:27:03,351 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-10-23 20:27:03,367 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-10-23 20:27:03,396 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-10-23 20:27:03,396 INFO L378 AbstractCegarLoop]: Hoare is true [2020-10-23 20:27:03,397 INFO L379 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2020-10-23 20:27:03,397 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-23 20:27:03,397 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-23 20:27:03,397 INFO L382 AbstractCegarLoop]: Difference is false [2020-10-23 20:27:03,397 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-23 20:27:03,398 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-10-23 20:27:03,417 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states. [2020-10-23 20:27:03,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-10-23 20:27:03,429 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 20:27:03,430 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 20:27:03,431 INFO L429 AbstractCegarLoop]: === Iteration 1 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 20:27:03,438 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 20:27:03,439 INFO L82 PathProgramCache]: Analyzing trace with hash -407315157, now seen corresponding path program 1 times [2020-10-23 20:27:03,450 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 20:27:03,451 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1188600157] [2020-10-23 20:27:03,451 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 20:27:03,540 INFO L321 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-10-23 20:27:03,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 20:27:03,910 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 20:27:03,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 20:27:03,957 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2020-10-23 20:27:03,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 20:27:04,024 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 20:27:04,026 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1188600157] [2020-10-23 20:27:04,029 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 20:27:04,030 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-10-23 20:27:04,030 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1712789403] [2020-10-23 20:27:04,036 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-10-23 20:27:04,036 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 20:27:04,051 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-10-23 20:27:04,052 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-10-23 20:27:04,055 INFO L87 Difference]: Start difference. First operand 46 states. Second operand 6 states. [2020-10-23 20:27:04,505 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 20:27:04,505 INFO L93 Difference]: Finished difference Result 61 states and 66 transitions. [2020-10-23 20:27:04,506 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-10-23 20:27:04,507 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 25 [2020-10-23 20:27:04,508 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 20:27:04,518 INFO L225 Difference]: With dead ends: 61 [2020-10-23 20:27:04,518 INFO L226 Difference]: Without dead ends: 41 [2020-10-23 20:27:04,522 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2020-10-23 20:27:04,542 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-10-23 20:27:04,579 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-10-23 20:27:04,580 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-10-23 20:27:04,582 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 43 transitions. [2020-10-23 20:27:04,584 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 43 transitions. Word has length 25 [2020-10-23 20:27:04,584 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 20:27:04,584 INFO L481 AbstractCegarLoop]: Abstraction has 41 states and 43 transitions. [2020-10-23 20:27:04,585 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-10-23 20:27:04,585 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 43 transitions. [2020-10-23 20:27:04,587 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-10-23 20:27:04,587 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 20:27:04,587 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 20:27:04,588 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-10-23 20:27:04,588 INFO L429 AbstractCegarLoop]: === Iteration 2 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 20:27:04,589 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 20:27:04,589 INFO L82 PathProgramCache]: Analyzing trace with hash -795183819, now seen corresponding path program 1 times [2020-10-23 20:27:04,589 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 20:27:04,590 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1916903586] [2020-10-23 20:27:04,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 20:27:04,594 INFO L321 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-10-23 20:27:04,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 20:27:04,720 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 20:27:04,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 20:27:04,735 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2020-10-23 20:27:04,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 20:27:04,773 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-23 20:27:04,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 20:27:04,808 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 20:27:04,809 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1916903586] [2020-10-23 20:27:04,810 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 20:27:04,810 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-10-23 20:27:04,810 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1130883128] [2020-10-23 20:27:04,811 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-10-23 20:27:04,811 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 20:27:04,812 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-10-23 20:27:04,813 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2020-10-23 20:27:04,813 INFO L87 Difference]: Start difference. First operand 41 states and 43 transitions. Second operand 8 states. [2020-10-23 20:27:05,178 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 20:27:05,179 INFO L93 Difference]: Finished difference Result 55 states and 57 transitions. [2020-10-23 20:27:05,179 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-10-23 20:27:05,180 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 33 [2020-10-23 20:27:05,180 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 20:27:05,182 INFO L225 Difference]: With dead ends: 55 [2020-10-23 20:27:05,182 INFO L226 Difference]: Without dead ends: 48 [2020-10-23 20:27:05,184 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=37, Invalid=119, Unknown=0, NotChecked=0, Total=156 [2020-10-23 20:27:05,185 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-10-23 20:27:05,201 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 46. [2020-10-23 20:27:05,201 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-10-23 20:27:05,205 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 48 transitions. [2020-10-23 20:27:05,206 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 48 transitions. Word has length 33 [2020-10-23 20:27:05,206 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 20:27:05,206 INFO L481 AbstractCegarLoop]: Abstraction has 46 states and 48 transitions. [2020-10-23 20:27:05,206 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-10-23 20:27:05,206 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 48 transitions. [2020-10-23 20:27:05,211 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-10-23 20:27:05,211 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 20:27:05,212 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 20:27:05,212 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-10-23 20:27:05,212 INFO L429 AbstractCegarLoop]: === Iteration 3 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 20:27:05,214 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 20:27:05,214 INFO L82 PathProgramCache]: Analyzing trace with hash 870121323, now seen corresponding path program 1 times [2020-10-23 20:27:05,215 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 20:27:05,215 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [136267993] [2020-10-23 20:27:05,215 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 20:27:05,452 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 20:27:05,601 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 20:27:05,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-23 20:27:05,653 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-23 20:27:05,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-23 20:27:05,731 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-23 20:27:05,790 INFO L173 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-10-23 20:27:05,791 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-10-23 20:27:05,800 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-10-23 20:27:05,828 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 23.10 08:27:05 BoogieIcfgContainer [2020-10-23 20:27:05,828 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-10-23 20:27:05,837 INFO L168 Benchmark]: Toolchain (without parser) took 3320.43 ms. Allocated memory was 151.0 MB in the beginning and 181.4 MB in the end (delta: 30.4 MB). Free memory was 128.1 MB in the beginning and 156.0 MB in the end (delta: -27.9 MB). Peak memory consumption was 2.9 MB. Max. memory is 8.0 GB. [2020-10-23 20:27:05,840 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 125.8 MB. Free memory is still 102.5 MB. There was no memory consumed. Max. memory is 8.0 GB. [2020-10-23 20:27:05,842 INFO L168 Benchmark]: CACSL2BoogieTranslator took 251.56 ms. Allocated memory is still 151.0 MB. Free memory was 127.6 MB in the beginning and 117.8 MB in the end (delta: 9.8 MB). Peak memory consumption was 10.5 MB. Max. memory is 8.0 GB. [2020-10-23 20:27:05,842 INFO L168 Benchmark]: Boogie Preprocessor took 35.59 ms. Allocated memory is still 151.0 MB. Free memory was 117.8 MB in the beginning and 116.5 MB in the end (delta: 1.2 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2020-10-23 20:27:05,844 INFO L168 Benchmark]: RCFGBuilder took 487.11 ms. Allocated memory is still 151.0 MB. Free memory was 116.3 MB in the beginning and 102.7 MB in the end (delta: 13.6 MB). Peak memory consumption was 13.6 MB. Max. memory is 8.0 GB. [2020-10-23 20:27:05,846 INFO L168 Benchmark]: TraceAbstraction took 2528.64 ms. Allocated memory was 151.0 MB in the beginning and 181.4 MB in the end (delta: 30.4 MB). Free memory was 102.1 MB in the beginning and 156.5 MB in the end (delta: -54.4 MB). There was no memory consumed. Max. memory is 8.0 GB. [2020-10-23 20:27:05,856 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 125.8 MB. Free memory is still 102.5 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 251.56 ms. Allocated memory is still 151.0 MB. Free memory was 127.6 MB in the beginning and 117.8 MB in the end (delta: 9.8 MB). Peak memory consumption was 10.5 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 35.59 ms. Allocated memory is still 151.0 MB. Free memory was 117.8 MB in the beginning and 116.5 MB in the end (delta: 1.2 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * RCFGBuilder took 487.11 ms. Allocated memory is still 151.0 MB. Free memory was 116.3 MB in the beginning and 102.7 MB in the end (delta: 13.6 MB). Peak memory consumption was 13.6 MB. Max. memory is 8.0 GB. * TraceAbstraction took 2528.64 ms. Allocated memory was 151.0 MB in the beginning and 181.4 MB in the end (delta: 30.4 MB). Free memory was 102.1 MB in the beginning and 156.5 MB in the end (delta: -54.4 MB). There was no memory consumed. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 4]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L20] int input = 5; [L21] CALL, EXPR id(input) [L10] COND FALSE !(x==0) [L11] CALL, EXPR id2(x-1) [L15] COND FALSE !(x==0) [L16] CALL, EXPR id(x-1) [L10] COND TRUE x==0 [L10] return 0; [L16] RET, EXPR id(x-1) [L16] return id(x-1) + 1; [L11] RET, EXPR id2(x-1) [L11] return id2(x-1) + 1; [L21] RET, EXPR id(input) [L21] int result = id(input); [L22] COND TRUE result == 5 [L23] CALL reach_error() [L4] __assert_fail("0", "id2_i5_o5-1.c", 4, "reach_error") - StatisticsResult: Ultimate Automizer benchmark data CFG has 6 procedures, 46 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 2.4s, OverallIterations: 3, TraceHistogramMax: 2, AutomataDifference: 0.8s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 73 SDtfs, 83 SDslu, 135 SDs, 0 SdLazy, 211 SolverSat, 21 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 29 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.6s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=46occurred 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, 2 StatesRemovedByMinimization, 1 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...