/usr/bin/java -ea -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/afterrec_2calls-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-267fbe0 [2020-07-17 22:09:08,304 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-17 22:09:08,307 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-17 22:09:08,325 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-17 22:09:08,325 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-17 22:09:08,326 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-17 22:09:08,327 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-17 22:09:08,329 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-17 22:09:08,331 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-17 22:09:08,332 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-17 22:09:08,333 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-17 22:09:08,334 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-17 22:09:08,334 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-17 22:09:08,335 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-17 22:09:08,336 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-17 22:09:08,337 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-17 22:09:08,338 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-17 22:09:08,339 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-17 22:09:08,340 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-17 22:09:08,342 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-17 22:09:08,344 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-17 22:09:08,345 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-17 22:09:08,346 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-17 22:09:08,347 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-17 22:09:08,349 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-17 22:09:08,356 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-17 22:09:08,357 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-17 22:09:08,358 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-17 22:09:08,359 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-17 22:09:08,373 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-17 22:09:08,374 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-17 22:09:08,375 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-17 22:09:08,375 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-17 22:09:08,375 INFO L138 SettingsManager]: * Use SBE=true [2020-07-17 22:09:08,375 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-17 22:09:08,376 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-17 22:09:08,376 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-17 22:09:08,376 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-17 22:09:08,376 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-17 22:09:08,376 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-17 22:09:08,377 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-17 22:09:08,377 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-17 22:09:08,377 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-17 22:09:08,377 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-17 22:09:08,377 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-17 22:09:08,378 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-17 22:09:08,378 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-17 22:09:08,378 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-17 22:09:08,378 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-17 22:09:08,378 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-17 22:09:08,379 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-17 22:09:08,379 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-17 22:09:08,379 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-17 22:09:08,379 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-17 22:09:08,379 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-17 22:09:08,380 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-17 22:09:08,380 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-17 22:09:08,380 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-17 22:09:08,380 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-07-17 22:09:08,633 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-17 22:09:08,650 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-17 22:09:08,653 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-17 22:09:08,655 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-17 22:09:08,656 INFO L275 PluginConnector]: CDTParser initialized [2020-07-17 22:09:08,657 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/afterrec_2calls-1.c [2020-07-17 22:09:08,733 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/04d630679/3db3e52e8e1b4293be1eb0e42e6fd318/FLAG575345524 [2020-07-17 22:09:09,211 INFO L306 CDTParser]: Found 1 translation units. [2020-07-17 22:09:09,212 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/afterrec_2calls-1.c [2020-07-17 22:09:09,218 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/04d630679/3db3e52e8e1b4293be1eb0e42e6fd318/FLAG575345524 [2020-07-17 22:09:09,554 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/04d630679/3db3e52e8e1b4293be1eb0e42e6fd318 [2020-07-17 22:09:09,564 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-17 22:09:09,567 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-17 22:09:09,569 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-17 22:09:09,569 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-17 22:09:09,573 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-17 22:09:09,574 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.07 10:09:09" (1/1) ... [2020-07-17 22:09:09,577 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5a9546d5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 10:09:09, skipping insertion in model container [2020-07-17 22:09:09,578 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.07 10:09:09" (1/1) ... [2020-07-17 22:09:09,585 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-17 22:09:09,603 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-17 22:09:09,747 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-17 22:09:09,752 INFO L203 MainTranslator]: Completed pre-run [2020-07-17 22:09:09,766 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-17 22:09:09,781 INFO L208 MainTranslator]: Completed translation [2020-07-17 22:09:09,781 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 10:09:09 WrapperNode [2020-07-17 22:09:09,782 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-17 22:09:09,782 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-17 22:09:09,782 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-17 22:09:09,783 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-17 22:09:09,796 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 10:09:09" (1/1) ... [2020-07-17 22:09:09,796 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 10:09:09" (1/1) ... [2020-07-17 22:09:09,801 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 10:09:09" (1/1) ... [2020-07-17 22:09:09,802 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 10:09:09" (1/1) ... [2020-07-17 22:09:09,806 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 10:09:09" (1/1) ... [2020-07-17 22:09:09,808 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 10:09:09" (1/1) ... [2020-07-17 22:09:09,809 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 10:09:09" (1/1) ... [2020-07-17 22:09:09,810 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-17 22:09:09,811 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-17 22:09:09,811 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-17 22:09:09,811 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-17 22:09:09,812 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 10:09:09" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-17 22:09:09,953 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-17 22:09:09,953 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-17 22:09:09,954 INFO L138 BoogieDeclarations]: Found implementation of procedure f [2020-07-17 22:09:09,954 INFO L138 BoogieDeclarations]: Found implementation of procedure f2 [2020-07-17 22:09:09,954 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-17 22:09:09,954 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-17 22:09:09,954 INFO L130 BoogieDeclarations]: Found specification of procedure f [2020-07-17 22:09:09,955 INFO L130 BoogieDeclarations]: Found specification of procedure f2 [2020-07-17 22:09:09,955 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-17 22:09:09,956 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-17 22:09:09,956 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-17 22:09:10,211 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-17 22:09:10,212 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-17 22:09:10,215 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 17.07 10:09:10 BoogieIcfgContainer [2020-07-17 22:09:10,216 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-17 22:09:10,225 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-17 22:09:10,225 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-17 22:09:10,228 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-17 22:09:10,229 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 17.07 10:09:09" (1/3) ... [2020-07-17 22:09:10,232 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6943374b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 17.07 10:09:10, skipping insertion in model container [2020-07-17 22:09:10,242 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 10:09:09" (2/3) ... [2020-07-17 22:09:10,243 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6943374b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 17.07 10:09:10, skipping insertion in model container [2020-07-17 22:09:10,243 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 17.07 10:09:10" (3/3) ... [2020-07-17 22:09:10,245 INFO L109 eAbstractionObserver]: Analyzing ICFG afterrec_2calls-1.c [2020-07-17 22:09:10,265 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-07-17 22:09:10,273 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 2 error locations. [2020-07-17 22:09:10,285 INFO L251 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2020-07-17 22:09:10,306 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-17 22:09:10,306 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-17 22:09:10,307 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-07-17 22:09:10,307 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-17 22:09:10,307 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-17 22:09:10,307 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-17 22:09:10,307 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-17 22:09:10,307 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-17 22:09:10,324 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states. [2020-07-17 22:09:10,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-17 22:09:10,329 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 22:09:10,330 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 22:09:10,331 INFO L427 AbstractCegarLoop]: === Iteration 1 === [fErr0ASSERT_VIOLATIONERROR_FUNCTION, f2Err0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 22:09:10,335 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 22:09:10,335 INFO L82 PathProgramCache]: Analyzing trace with hash -1662209305, now seen corresponding path program 1 times [2020-07-17 22:09:10,342 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-07-17 22:09:10,343 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1005213157] [2020-07-17 22:09:10,343 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 22:09:10,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 22:09:10,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 22:09:10,595 INFO L280 TraceCheckUtils]: 0: Hoare triple {26#true} assume true; {26#true} is VALID [2020-07-17 22:09:10,596 INFO L275 TraceCheckUtils]: 1: Hoare quadruple {26#true} {26#true} #29#return; {26#true} is VALID [2020-07-17 22:09:10,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 22:09:10,656 INFO L280 TraceCheckUtils]: 0: Hoare triple {26#true} ~n := #in~n; {37#(= f2_~n |f2_#in~n|)} is VALID [2020-07-17 22:09:10,658 INFO L280 TraceCheckUtils]: 1: Hoare triple {37#(= f2_~n |f2_#in~n|)} assume ~n < 3; {38#(<= |f2_#in~n| 2)} is VALID [2020-07-17 22:09:10,660 INFO L280 TraceCheckUtils]: 2: Hoare triple {38#(<= |f2_#in~n| 2)} assume true; {38#(<= |f2_#in~n| 2)} is VALID [2020-07-17 22:09:10,661 INFO L275 TraceCheckUtils]: 3: Hoare quadruple {38#(<= |f2_#in~n| 2)} {32#(<= 3 f_~n)} #27#return; {27#false} is VALID [2020-07-17 22:09:10,662 INFO L263 TraceCheckUtils]: 0: Hoare triple {26#true} call ULTIMATE.init(); {26#true} is VALID [2020-07-17 22:09:10,663 INFO L280 TraceCheckUtils]: 1: Hoare triple {26#true} assume true; {26#true} is VALID [2020-07-17 22:09:10,663 INFO L275 TraceCheckUtils]: 2: Hoare quadruple {26#true} {26#true} #29#return; {26#true} is VALID [2020-07-17 22:09:10,663 INFO L263 TraceCheckUtils]: 3: Hoare triple {26#true} call #t~ret4 := main(); {26#true} is VALID [2020-07-17 22:09:10,664 INFO L263 TraceCheckUtils]: 4: Hoare triple {26#true} call f(4); {30#(<= 4 |f_#in~n|)} is VALID [2020-07-17 22:09:10,665 INFO L280 TraceCheckUtils]: 5: Hoare triple {30#(<= 4 |f_#in~n|)} ~n := #in~n; {31#(<= 4 f_~n)} is VALID [2020-07-17 22:09:10,667 INFO L280 TraceCheckUtils]: 6: Hoare triple {31#(<= 4 f_~n)} assume !(~n < 3);#t~post2 := ~n;~n := #t~post2 - 1;havoc #t~post2; {32#(<= 3 f_~n)} is VALID [2020-07-17 22:09:10,668 INFO L263 TraceCheckUtils]: 7: Hoare triple {32#(<= 3 f_~n)} call f2(~n); {26#true} is VALID [2020-07-17 22:09:10,669 INFO L280 TraceCheckUtils]: 8: Hoare triple {26#true} ~n := #in~n; {37#(= f2_~n |f2_#in~n|)} is VALID [2020-07-17 22:09:10,671 INFO L280 TraceCheckUtils]: 9: Hoare triple {37#(= f2_~n |f2_#in~n|)} assume ~n < 3; {38#(<= |f2_#in~n| 2)} is VALID [2020-07-17 22:09:10,672 INFO L280 TraceCheckUtils]: 10: Hoare triple {38#(<= |f2_#in~n| 2)} assume true; {38#(<= |f2_#in~n| 2)} is VALID [2020-07-17 22:09:10,674 INFO L275 TraceCheckUtils]: 11: Hoare quadruple {38#(<= |f2_#in~n| 2)} {32#(<= 3 f_~n)} #27#return; {27#false} is VALID [2020-07-17 22:09:10,675 INFO L280 TraceCheckUtils]: 12: Hoare triple {27#false} assume !false; {27#false} is VALID [2020-07-17 22:09:10,677 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-17 22:09:10,677 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1005213157] [2020-07-17 22:09:10,679 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-17 22:09:10,679 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-07-17 22:09:10,680 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [682949406] [2020-07-17 22:09:10,686 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 13 [2020-07-17 22:09:10,689 INFO L84 Accepts]: Finished accepts. word is accepted. [2020-07-17 22:09:10,693 INFO L86 InductivityCheck]: Starting indutivity check of a Floyd-Hoare automaton with 7 states. [2020-07-17 22:09:10,729 INFO L119 InductivityCheck]: Floyd-Hoare automaton has 13 edges. 13 inductive. 0 not inductive. 0 times theorem prover too weak to decide inductivity. [2020-07-17 22:09:10,729 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-07-17 22:09:10,730 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-07-17 22:09:10,738 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-07-17 22:09:10,740 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-07-17 22:09:10,742 INFO L87 Difference]: Start difference. First operand 23 states. Second operand 7 states. [2020-07-17 22:09:11,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 22:09:11,009 INFO L93 Difference]: Finished difference Result 34 states and 39 transitions. [2020-07-17 22:09:11,010 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-17 22:09:11,010 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 13 [2020-07-17 22:09:11,010 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 22:09:11,012 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2020-07-17 22:09:11,021 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 39 transitions. [2020-07-17 22:09:11,021 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2020-07-17 22:09:11,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 39 transitions. [2020-07-17 22:09:11,026 INFO L86 InductivityCheck]: Starting indutivity check of a Floyd-Hoare automaton with 7 states and 39 transitions. [2020-07-17 22:09:11,084 INFO L119 InductivityCheck]: Floyd-Hoare automaton has 39 edges. 39 inductive. 0 not inductive. 0 times theorem prover too weak to decide inductivity. [2020-07-17 22:09:11,096 INFO L225 Difference]: With dead ends: 34 [2020-07-17 22:09:11,096 INFO L226 Difference]: Without dead ends: 22 [2020-07-17 22:09:11,100 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2020-07-17 22:09:11,119 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-07-17 22:09:11,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-07-17 22:09:11,146 INFO L214 AbstractMinimizeNwa]: Start testing correctness of minimizeSevpa [2020-07-17 22:09:11,146 INFO L82 GeneralOperation]: Start isEquivalent. First operand 22 states. Second operand 22 states. [2020-07-17 22:09:11,147 INFO L74 IsIncluded]: Start isIncluded. First operand 22 states. Second operand 22 states. [2020-07-17 22:09:11,147 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 22 states. [2020-07-17 22:09:11,152 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 22:09:11,152 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2020-07-17 22:09:11,152 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2020-07-17 22:09:11,153 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-17 22:09:11,154 INFO L83 IsIncluded]: Finished isIncluded. Language is included [2020-07-17 22:09:11,154 INFO L74 IsIncluded]: Start isIncluded. First operand 22 states. Second operand 22 states. [2020-07-17 22:09:11,154 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 22 states. [2020-07-17 22:09:11,158 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 22:09:11,158 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2020-07-17 22:09:11,159 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2020-07-17 22:09:11,159 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-17 22:09:11,160 INFO L83 IsIncluded]: Finished isIncluded. Language is included [2020-07-17 22:09:11,160 INFO L88 GeneralOperation]: Finished isEquivalent. [2020-07-17 22:09:11,160 INFO L221 AbstractMinimizeNwa]: Finished testing correctness of minimizeSevpa [2020-07-17 22:09:11,161 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-07-17 22:09:11,163 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2020-07-17 22:09:11,165 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 13 [2020-07-17 22:09:11,165 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 22:09:11,166 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2020-07-17 22:09:11,166 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-07-17 22:09:11,166 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2020-07-17 22:09:11,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-07-17 22:09:11,167 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 22:09:11,167 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-17 22:09:11,168 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-07-17 22:09:11,168 INFO L427 AbstractCegarLoop]: === Iteration 2 === [fErr0ASSERT_VIOLATIONERROR_FUNCTION, f2Err0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 22:09:11,168 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 22:09:11,168 INFO L82 PathProgramCache]: Analyzing trace with hash -1078403623, now seen corresponding path program 1 times [2020-07-17 22:09:11,169 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-07-17 22:09:11,169 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1673155322] [2020-07-17 22:09:11,169 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 22:09:11,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-17 22:09:11,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-17 22:09:11,210 INFO L174 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-07-17 22:09:11,211 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-17 22:09:11,212 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-07-17 22:09:11,232 WARN L170 areAnnotationChecker]: ULTIMATE.initFINAL has no Hoare annotation [2020-07-17 22:09:11,232 WARN L170 areAnnotationChecker]: fENTRY has no Hoare annotation [2020-07-17 22:09:11,232 WARN L170 areAnnotationChecker]: ULTIMATE.startENTRY has no Hoare annotation [2020-07-17 22:09:11,233 WARN L170 areAnnotationChecker]: ULTIMATE.startENTRY has no Hoare annotation [2020-07-17 22:09:11,233 WARN L170 areAnnotationChecker]: mainENTRY has no Hoare annotation [2020-07-17 22:09:11,233 WARN L170 areAnnotationChecker]: mainENTRY has no Hoare annotation [2020-07-17 22:09:11,233 WARN L170 areAnnotationChecker]: f2ENTRY has no Hoare annotation [2020-07-17 22:09:11,233 WARN L170 areAnnotationChecker]: ULTIMATE.initEXIT has no Hoare annotation [2020-07-17 22:09:11,234 WARN L170 areAnnotationChecker]: L7 has no Hoare annotation [2020-07-17 22:09:11,234 WARN L170 areAnnotationChecker]: L7 has no Hoare annotation [2020-07-17 22:09:11,234 WARN L170 areAnnotationChecker]: L-1 has no Hoare annotation [2020-07-17 22:09:11,234 WARN L170 areAnnotationChecker]: L-1 has no Hoare annotation [2020-07-17 22:09:11,234 WARN L170 areAnnotationChecker]: mainFINAL has no Hoare annotation [2020-07-17 22:09:11,235 WARN L170 areAnnotationChecker]: L14 has no Hoare annotation [2020-07-17 22:09:11,235 WARN L170 areAnnotationChecker]: L14 has no Hoare annotation [2020-07-17 22:09:11,235 WARN L170 areAnnotationChecker]: fFINAL has no Hoare annotation [2020-07-17 22:09:11,235 WARN L170 areAnnotationChecker]: L9 has no Hoare annotation [2020-07-17 22:09:11,235 WARN L170 areAnnotationChecker]: L9 has no Hoare annotation [2020-07-17 22:09:11,235 WARN L170 areAnnotationChecker]: ULTIMATE.startFINAL has no Hoare annotation [2020-07-17 22:09:11,236 WARN L170 areAnnotationChecker]: mainEXIT has no Hoare annotation [2020-07-17 22:09:11,236 WARN L170 areAnnotationChecker]: f2FINAL has no Hoare annotation [2020-07-17 22:09:11,236 WARN L170 areAnnotationChecker]: L16 has no Hoare annotation [2020-07-17 22:09:11,236 WARN L170 areAnnotationChecker]: L16 has no Hoare annotation [2020-07-17 22:09:11,236 WARN L170 areAnnotationChecker]: fEXIT has no Hoare annotation [2020-07-17 22:09:11,236 WARN L170 areAnnotationChecker]: fEXIT has no Hoare annotation [2020-07-17 22:09:11,236 WARN L170 areAnnotationChecker]: L9-1 has no Hoare annotation [2020-07-17 22:09:11,237 WARN L170 areAnnotationChecker]: L9-1 has no Hoare annotation [2020-07-17 22:09:11,237 WARN L170 areAnnotationChecker]: f2EXIT has no Hoare annotation [2020-07-17 22:09:11,237 WARN L170 areAnnotationChecker]: L16-1 has no Hoare annotation [2020-07-17 22:09:11,237 WARN L170 areAnnotationChecker]: L16-1 has no Hoare annotation [2020-07-17 22:09:11,237 INFO L163 areAnnotationChecker]: CFG has 0 edges. 0 inductive. 0 not inductive. 0 times theorem prover too weak to decide inductivity. 0 times interpolants missing. [2020-07-17 22:09:11,240 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 17.07 10:09:11 BoogieIcfgContainer [2020-07-17 22:09:11,240 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-17 22:09:11,244 INFO L168 Benchmark]: Toolchain (without parser) took 1677.05 ms. Allocated memory was 138.4 MB in the beginning and 202.4 MB in the end (delta: 64.0 MB). Free memory was 103.4 MB in the beginning and 91.6 MB in the end (delta: 11.8 MB). Peak memory consumption was 75.8 MB. Max. memory is 7.1 GB. [2020-07-17 22:09:11,245 INFO L168 Benchmark]: CDTParser took 1.38 ms. Allocated memory is still 138.4 MB. Free memory was 121.5 MB in the beginning and 121.3 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-07-17 22:09:11,246 INFO L168 Benchmark]: CACSL2BoogieTranslator took 213.40 ms. Allocated memory is still 138.4 MB. Free memory was 103.0 MB in the beginning and 93.6 MB in the end (delta: 9.4 MB). Peak memory consumption was 9.4 MB. Max. memory is 7.1 GB. [2020-07-17 22:09:11,246 INFO L168 Benchmark]: Boogie Preprocessor took 28.19 ms. Allocated memory is still 138.4 MB. Free memory was 93.4 MB in the beginning and 92.1 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. [2020-07-17 22:09:11,248 INFO L168 Benchmark]: RCFGBuilder took 404.90 ms. Allocated memory was 138.4 MB in the beginning and 202.4 MB in the end (delta: 64.0 MB). Free memory was 92.1 MB in the beginning and 166.8 MB in the end (delta: -74.7 MB). Peak memory consumption was 14.1 MB. Max. memory is 7.1 GB. [2020-07-17 22:09:11,248 INFO L168 Benchmark]: TraceAbstraction took 1015.82 ms. Allocated memory is still 202.4 MB. Free memory was 166.1 MB in the beginning and 91.6 MB in the end (delta: 74.5 MB). Peak memory consumption was 74.5 MB. Max. memory is 7.1 GB. [2020-07-17 22:09:11,252 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - AssertionsEnabledResult: Assertions are enabled Assertions are enabled - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 1.38 ms. Allocated memory is still 138.4 MB. Free memory was 121.5 MB in the beginning and 121.3 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 213.40 ms. Allocated memory is still 138.4 MB. Free memory was 103.0 MB in the beginning and 93.6 MB in the end (delta: 9.4 MB). Peak memory consumption was 9.4 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 28.19 ms. Allocated memory is still 138.4 MB. Free memory was 93.4 MB in the beginning and 92.1 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 404.90 ms. Allocated memory was 138.4 MB in the beginning and 202.4 MB in the end (delta: 64.0 MB). Free memory was 92.1 MB in the beginning and 166.8 MB in the end (delta: -74.7 MB). Peak memory consumption was 14.1 MB. Max. memory is 7.1 GB. * TraceAbstraction took 1015.82 ms. Allocated memory is still 202.4 MB. Free memory was 166.1 MB in the beginning and 91.6 MB in the end (delta: 74.5 MB). Peak memory consumption was 74.5 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 17]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L21] CALL f(4) VAL [\old(n)=4] [L7] COND FALSE !(n<3) [L8] n-- VAL [\old(n)=4, n=3] [L9] CALL f2(n) VAL [\old(n)=3] [L14] COND FALSE !(n<3) [L15] n-- VAL [\old(n)=3, n=2] [L16] CALL f(n) VAL [\old(n)=2] [L7] COND TRUE n<3 VAL [\old(n)=2, n=2] [L16] RET f(n) VAL [\old(n)=3, n=2] [L17] __VERIFIER_error() VAL [\old(n)=3, n=2] - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 23 locations, 2 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 0.9s, OverallIterations: 2, TraceHistogramMax: 2, AutomataDifference: 0.3s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 14 SDtfs, 3 SDslu, 48 SDs, 0 SdLazy, 28 SolverSat, 3 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=23occurred 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, 1 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.2s InterpolantComputationTime, 29 NumberOfCodeBlocks, 29 NumberOfCodeBlocksAsserted, 2 NumberOfCheckSat, 12 ConstructedInterpolants, 0 QuantifiedInterpolants, 288 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 1 InterpolantComputations, 1 PerfectInterpolantSequences, 0/0 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...