/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 --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.use.separate.solver.for.trace.checks true -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf -i ../../../trunk/examples/svcomp/recursive-simple/afterrec-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-267fbe0 [2020-07-18 04:41:05,251 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-18 04:41:05,253 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-18 04:41:05,265 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-18 04:41:05,266 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-18 04:41:05,267 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-18 04:41:05,268 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-18 04:41:05,270 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-18 04:41:05,271 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-18 04:41:05,272 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-18 04:41:05,273 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-18 04:41:05,274 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-18 04:41:05,275 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-18 04:41:05,276 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-18 04:41:05,277 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-18 04:41:05,278 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-18 04:41:05,278 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-18 04:41:05,279 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-18 04:41:05,281 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-18 04:41:05,283 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-18 04:41:05,284 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-18 04:41:05,285 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-18 04:41:05,286 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-18 04:41:05,287 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-18 04:41:05,289 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-18 04:41:05,296 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-18 04:41:05,297 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-18 04:41:05,298 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-18 04:41:05,299 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf [2020-07-18 04:41:05,307 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-18 04:41:05,308 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-18 04:41:05,309 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-18 04:41:05,309 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-18 04:41:05,309 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-18 04:41:05,309 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-18 04:41:05,309 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-18 04:41:05,310 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-18 04:41:05,310 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-18 04:41:05,310 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-18 04:41:05,310 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-18 04:41:05,310 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-18 04:41:05,311 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-18 04:41:05,311 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-18 04:41:05,311 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-18 04:41:05,311 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-07-18 04:41:05,311 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-18 04:41:05,312 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-18 04:41:05,312 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-18 04:41:05,312 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-18 04:41:05,312 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-07-18 04:41:05,312 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-18 04:41:05,313 INFO L138 SettingsManager]: * Use separate solver for trace checks=false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use separate solver for trace checks -> true [2020-07-18 04:41:05,620 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-18 04:41:05,636 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-18 04:41:05,640 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-18 04:41:05,641 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-18 04:41:05,642 INFO L275 PluginConnector]: CDTParser initialized [2020-07-18 04:41:05,642 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/afterrec-1.c [2020-07-18 04:41:05,717 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c70296f22/e4046f3080e5400b850cad96b56fb7ef/FLAGa74657966 [2020-07-18 04:41:06,190 INFO L306 CDTParser]: Found 1 translation units. [2020-07-18 04:41:06,191 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/afterrec-1.c [2020-07-18 04:41:06,197 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c70296f22/e4046f3080e5400b850cad96b56fb7ef/FLAGa74657966 [2020-07-18 04:41:06,559 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c70296f22/e4046f3080e5400b850cad96b56fb7ef [2020-07-18 04:41:06,571 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-18 04:41:06,575 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-18 04:41:06,577 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-18 04:41:06,577 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-18 04:41:06,580 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-18 04:41:06,582 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.07 04:41:06" (1/1) ... [2020-07-18 04:41:06,585 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@723da32a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.07 04:41:06, skipping insertion in model container [2020-07-18 04:41:06,585 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.07 04:41:06" (1/1) ... [2020-07-18 04:41:06,594 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-18 04:41:06,609 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-18 04:41:06,763 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-18 04:41:06,767 INFO L203 MainTranslator]: Completed pre-run [2020-07-18 04:41:06,781 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-18 04:41:06,796 INFO L208 MainTranslator]: Completed translation [2020-07-18 04:41:06,797 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.07 04:41:06 WrapperNode [2020-07-18 04:41:06,797 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-18 04:41:06,798 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-18 04:41:06,798 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-18 04:41:06,798 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-18 04:41:06,810 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.07 04:41:06" (1/1) ... [2020-07-18 04:41:06,810 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.07 04:41:06" (1/1) ... [2020-07-18 04:41:06,814 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.07 04:41:06" (1/1) ... [2020-07-18 04:41:06,815 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.07 04:41:06" (1/1) ... [2020-07-18 04:41:06,900 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.07 04:41:06" (1/1) ... [2020-07-18 04:41:06,903 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.07 04:41:06" (1/1) ... [2020-07-18 04:41:06,904 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.07 04:41:06" (1/1) ... [2020-07-18 04:41:06,905 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-18 04:41:06,905 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-18 04:41:06,905 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-18 04:41:06,906 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-18 04:41:06,906 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.07 04:41:06" (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 [2020-07-18 04:41:06,975 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-18 04:41:06,975 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-18 04:41:06,975 INFO L138 BoogieDeclarations]: Found implementation of procedure f [2020-07-18 04:41:06,975 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-18 04:41:06,975 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-18 04:41:06,975 INFO L130 BoogieDeclarations]: Found specification of procedure f [2020-07-18 04:41:06,975 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-18 04:41:06,976 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-18 04:41:06,976 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-18 04:41:07,218 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-18 04:41:07,218 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-18 04:41:07,223 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.07 04:41:07 BoogieIcfgContainer [2020-07-18 04:41:07,223 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-18 04:41:07,231 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-18 04:41:07,231 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-18 04:41:07,237 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-18 04:41:07,238 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.07 04:41:06" (1/3) ... [2020-07-18 04:41:07,239 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@447c1cb6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.07 04:41:07, skipping insertion in model container [2020-07-18 04:41:07,239 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.07 04:41:06" (2/3) ... [2020-07-18 04:41:07,239 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@447c1cb6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.07 04:41:07, skipping insertion in model container [2020-07-18 04:41:07,240 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.07 04:41:07" (3/3) ... [2020-07-18 04:41:07,246 INFO L109 eAbstractionObserver]: Analyzing ICFG afterrec-1.c [2020-07-18 04:41:07,269 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-07-18 04:41:07,283 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-18 04:41:07,301 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-18 04:41:07,322 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-18 04:41:07,322 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-18 04:41:07,322 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-07-18 04:41:07,323 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-18 04:41:07,323 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-18 04:41:07,323 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-18 04:41:07,323 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-18 04:41:07,323 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-18 04:41:07,337 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2020-07-18 04:41:07,345 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-07-18 04:41:07,346 INFO L414 BasicCegarLoop]: Found error trace [2020-07-18 04:41:07,347 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-18 04:41:07,347 INFO L427 AbstractCegarLoop]: === Iteration 1 === [fErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-18 04:41:07,353 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-18 04:41:07,354 INFO L82 PathProgramCache]: Analyzing trace with hash -611063963, now seen corresponding path program 1 times [2020-07-18 04:41:07,362 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-18 04:41:07,362 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1931588265] [2020-07-18 04:41:07,363 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-18 04:41:07,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-18 04:41:07,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-18 04:41:07,631 INFO L280 TraceCheckUtils]: 0: Hoare triple {22#true} assume true; {22#true} is VALID [2020-07-18 04:41:07,632 INFO L275 TraceCheckUtils]: 1: Hoare quadruple {22#true} {22#true} #22#return; {22#true} is VALID [2020-07-18 04:41:07,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-18 04:41:07,711 INFO L280 TraceCheckUtils]: 0: Hoare triple {22#true} ~n := #in~n; {34#(= |f_#in~n| f_~n)} is VALID [2020-07-18 04:41:07,713 INFO L280 TraceCheckUtils]: 1: Hoare triple {34#(= |f_#in~n| f_~n)} assume ~n < 3; {35#(<= |f_#in~n| 2)} is VALID [2020-07-18 04:41:07,714 INFO L280 TraceCheckUtils]: 2: Hoare triple {35#(<= |f_#in~n| 2)} assume true; {35#(<= |f_#in~n| 2)} is VALID [2020-07-18 04:41:07,716 INFO L275 TraceCheckUtils]: 3: Hoare quadruple {35#(<= |f_#in~n| 2)} {29#(<= 3 f_~n)} #20#return; {23#false} is VALID [2020-07-18 04:41:07,716 INFO L263 TraceCheckUtils]: 0: Hoare triple {22#true} call ULTIMATE.init(); {22#true} is VALID [2020-07-18 04:41:07,717 INFO L280 TraceCheckUtils]: 1: Hoare triple {22#true} assume true; {22#true} is VALID [2020-07-18 04:41:07,717 INFO L275 TraceCheckUtils]: 2: Hoare quadruple {22#true} {22#true} #22#return; {22#true} is VALID [2020-07-18 04:41:07,718 INFO L263 TraceCheckUtils]: 3: Hoare triple {22#true} call #t~ret1 := main(); {22#true} is VALID [2020-07-18 04:41:07,719 INFO L263 TraceCheckUtils]: 4: Hoare triple {22#true} call f(4); {26#(<= 4 |f_#in~n|)} is VALID [2020-07-18 04:41:07,720 INFO L280 TraceCheckUtils]: 5: Hoare triple {26#(<= 4 |f_#in~n|)} ~n := #in~n; {27#(<= 4 f_~n)} is VALID [2020-07-18 04:41:07,722 INFO L280 TraceCheckUtils]: 6: Hoare triple {27#(<= 4 f_~n)} assume !(~n < 3); {27#(<= 4 f_~n)} is VALID [2020-07-18 04:41:07,723 INFO L280 TraceCheckUtils]: 7: Hoare triple {27#(<= 4 f_~n)} #t~post0 := ~n; {28#(<= 4 |f_#t~post0|)} is VALID [2020-07-18 04:41:07,724 INFO L280 TraceCheckUtils]: 8: Hoare triple {28#(<= 4 |f_#t~post0|)} ~n := #t~post0 - 1; {29#(<= 3 f_~n)} is VALID [2020-07-18 04:41:07,725 INFO L280 TraceCheckUtils]: 9: Hoare triple {29#(<= 3 f_~n)} havoc #t~post0; {29#(<= 3 f_~n)} is VALID [2020-07-18 04:41:07,726 INFO L263 TraceCheckUtils]: 10: Hoare triple {29#(<= 3 f_~n)} call f(~n); {22#true} is VALID [2020-07-18 04:41:07,727 INFO L280 TraceCheckUtils]: 11: Hoare triple {22#true} ~n := #in~n; {34#(= |f_#in~n| f_~n)} is VALID [2020-07-18 04:41:07,728 INFO L280 TraceCheckUtils]: 12: Hoare triple {34#(= |f_#in~n| f_~n)} assume ~n < 3; {35#(<= |f_#in~n| 2)} is VALID [2020-07-18 04:41:07,730 INFO L280 TraceCheckUtils]: 13: Hoare triple {35#(<= |f_#in~n| 2)} assume true; {35#(<= |f_#in~n| 2)} is VALID [2020-07-18 04:41:07,731 INFO L275 TraceCheckUtils]: 14: Hoare quadruple {35#(<= |f_#in~n| 2)} {29#(<= 3 f_~n)} #20#return; {23#false} is VALID [2020-07-18 04:41:07,732 INFO L280 TraceCheckUtils]: 15: Hoare triple {23#false} assume !false; {23#false} is VALID [2020-07-18 04:41:07,734 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-18 04:41:07,735 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1931588265] [2020-07-18 04:41:07,737 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-18 04:41:07,738 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-07-18 04:41:07,739 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [499509088] [2020-07-18 04:41:07,744 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 16 [2020-07-18 04:41:07,747 INFO L84 Accepts]: Finished accepts. word is accepted. [2020-07-18 04:41:07,750 INFO L86 InductivityCheck]: Starting indutivity check of a Floyd-Hoare automaton with 8 states. [2020-07-18 04:41:07,787 INFO L119 InductivityCheck]: Floyd-Hoare automaton has 16 edges. 16 inductive. 0 not inductive. 0 times theorem prover too weak to decide inductivity. [2020-07-18 04:41:07,788 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-18 04:41:07,788 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-18 04:41:07,797 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-18 04:41:07,799 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-07-18 04:41:07,801 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 8 states. [2020-07-18 04:41:08,182 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-18 04:41:08,183 INFO L93 Difference]: Finished difference Result 29 states and 33 transitions. [2020-07-18 04:41:08,183 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-18 04:41:08,184 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 16 [2020-07-18 04:41:08,184 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-18 04:41:08,186 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8 states. [2020-07-18 04:41:08,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 33 transitions. [2020-07-18 04:41:08,195 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8 states. [2020-07-18 04:41:08,202 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 33 transitions. [2020-07-18 04:41:08,203 INFO L86 InductivityCheck]: Starting indutivity check of a Floyd-Hoare automaton with 10 states and 33 transitions. [2020-07-18 04:41:08,268 INFO L119 InductivityCheck]: Floyd-Hoare automaton has 33 edges. 33 inductive. 0 not inductive. 0 times theorem prover too weak to decide inductivity. [2020-07-18 04:41:08,279 INFO L225 Difference]: With dead ends: 29 [2020-07-18 04:41:08,279 INFO L226 Difference]: Without dead ends: 21 [2020-07-18 04:41:08,283 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=51, Invalid=131, Unknown=0, NotChecked=0, Total=182 [2020-07-18 04:41:08,302 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-18 04:41:08,348 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-18 04:41:08,348 INFO L214 AbstractMinimizeNwa]: Start testing correctness of minimizeSevpa [2020-07-18 04:41:08,349 INFO L82 GeneralOperation]: Start isEquivalent. First operand 21 states. Second operand 21 states. [2020-07-18 04:41:08,350 INFO L74 IsIncluded]: Start isIncluded. First operand 21 states. Second operand 21 states. [2020-07-18 04:41:08,350 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 21 states. [2020-07-18 04:41:08,354 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-18 04:41:08,355 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2020-07-18 04:41:08,355 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2020-07-18 04:41:08,356 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-18 04:41:08,356 INFO L83 IsIncluded]: Finished isIncluded. Language is included [2020-07-18 04:41:08,356 INFO L74 IsIncluded]: Start isIncluded. First operand 21 states. Second operand 21 states. [2020-07-18 04:41:08,356 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 21 states. [2020-07-18 04:41:08,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-18 04:41:08,360 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2020-07-18 04:41:08,360 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2020-07-18 04:41:08,361 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-18 04:41:08,361 INFO L83 IsIncluded]: Finished isIncluded. Language is included [2020-07-18 04:41:08,361 INFO L88 GeneralOperation]: Finished isEquivalent. [2020-07-18 04:41:08,362 INFO L221 AbstractMinimizeNwa]: Finished testing correctness of minimizeSevpa [2020-07-18 04:41:08,362 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-18 04:41:08,364 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2020-07-18 04:41:08,366 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 16 [2020-07-18 04:41:08,366 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-18 04:41:08,366 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2020-07-18 04:41:08,367 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-18 04:41:08,367 INFO L86 InductivityCheck]: Starting indutivity check of a Floyd-Hoare automaton with 21 states and 21 transitions. [2020-07-18 04:41:08,392 INFO L119 InductivityCheck]: Floyd-Hoare automaton has 21 edges. 21 inductive. 0 not inductive. 0 times theorem prover too weak to decide inductivity. [2020-07-18 04:41:08,392 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2020-07-18 04:41:08,393 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-18 04:41:08,393 INFO L414 BasicCegarLoop]: Found error trace [2020-07-18 04:41:08,393 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-18 04:41:08,394 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-07-18 04:41:08,394 INFO L427 AbstractCegarLoop]: === Iteration 2 === [fErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-18 04:41:08,394 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-18 04:41:08,395 INFO L82 PathProgramCache]: Analyzing trace with hash 1633986229, now seen corresponding path program 2 times [2020-07-18 04:41:08,395 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-18 04:41:08,395 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [642270138] [2020-07-18 04:41:08,395 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-18 04:41:08,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-18 04:41:08,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-18 04:41:08,440 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-18 04:41:08,440 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-18 04:41:08,442 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-07-18 04:41:08,462 WARN L170 areAnnotationChecker]: ULTIMATE.initFINAL has no Hoare annotation [2020-07-18 04:41:08,462 WARN L170 areAnnotationChecker]: fENTRY has no Hoare annotation [2020-07-18 04:41:08,462 WARN L170 areAnnotationChecker]: ULTIMATE.startENTRY has no Hoare annotation [2020-07-18 04:41:08,463 WARN L170 areAnnotationChecker]: ULTIMATE.startENTRY has no Hoare annotation [2020-07-18 04:41:08,463 WARN L170 areAnnotationChecker]: mainENTRY has no Hoare annotation [2020-07-18 04:41:08,463 WARN L170 areAnnotationChecker]: mainENTRY has no Hoare annotation [2020-07-18 04:41:08,463 WARN L170 areAnnotationChecker]: ULTIMATE.initEXIT has no Hoare annotation [2020-07-18 04:41:08,463 WARN L170 areAnnotationChecker]: L4 has no Hoare annotation [2020-07-18 04:41:08,463 WARN L170 areAnnotationChecker]: L4 has no Hoare annotation [2020-07-18 04:41:08,464 WARN L170 areAnnotationChecker]: L-1 has no Hoare annotation [2020-07-18 04:41:08,464 WARN L170 areAnnotationChecker]: L-1 has no Hoare annotation [2020-07-18 04:41:08,464 WARN L170 areAnnotationChecker]: mainFINAL has no Hoare annotation [2020-07-18 04:41:08,464 WARN L170 areAnnotationChecker]: fFINAL has no Hoare annotation [2020-07-18 04:41:08,464 WARN L170 areAnnotationChecker]: L5 has no Hoare annotation [2020-07-18 04:41:08,464 WARN L170 areAnnotationChecker]: ULTIMATE.startFINAL has no Hoare annotation [2020-07-18 04:41:08,465 WARN L170 areAnnotationChecker]: mainEXIT has no Hoare annotation [2020-07-18 04:41:08,465 WARN L170 areAnnotationChecker]: fEXIT has no Hoare annotation [2020-07-18 04:41:08,465 WARN L170 areAnnotationChecker]: fEXIT has no Hoare annotation [2020-07-18 04:41:08,465 WARN L170 areAnnotationChecker]: L5-1 has no Hoare annotation [2020-07-18 04:41:08,465 WARN L170 areAnnotationChecker]: L6-1 has no Hoare annotation [2020-07-18 04:41:08,465 WARN L170 areAnnotationChecker]: L6-1 has no Hoare annotation [2020-07-18 04:41:08,465 WARN L170 areAnnotationChecker]: L5-2 has no Hoare annotation [2020-07-18 04:41:08,466 WARN L170 areAnnotationChecker]: L6 has no Hoare annotation [2020-07-18 04:41:08,466 WARN L170 areAnnotationChecker]: L6 has no Hoare annotation [2020-07-18 04:41:08,466 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. [2020-07-18 04:41:08,469 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 18.07 04:41:08 BoogieIcfgContainer [2020-07-18 04:41:08,469 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-18 04:41:08,473 INFO L168 Benchmark]: Toolchain (without parser) took 1898.67 ms. Allocated memory was 136.3 MB in the beginning and 228.1 MB in the end (delta: 91.8 MB). Free memory was 101.8 MB in the beginning and 180.8 MB in the end (delta: -79.1 MB). Peak memory consumption was 12.7 MB. Max. memory is 7.1 GB. [2020-07-18 04:41:08,474 INFO L168 Benchmark]: CDTParser took 1.06 ms. Allocated memory is still 136.3 MB. Free memory was 119.7 MB in the beginning and 119.5 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. [2020-07-18 04:41:08,475 INFO L168 Benchmark]: CACSL2BoogieTranslator took 220.49 ms. Allocated memory is still 136.3 MB. Free memory was 101.4 MB in the beginning and 92.2 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. [2020-07-18 04:41:08,476 INFO L168 Benchmark]: Boogie Preprocessor took 107.41 ms. Allocated memory was 136.3 MB in the beginning and 199.2 MB in the end (delta: 62.9 MB). Free memory was 92.2 MB in the beginning and 178.5 MB in the end (delta: -86.3 MB). Peak memory consumption was 14.8 MB. Max. memory is 7.1 GB. [2020-07-18 04:41:08,477 INFO L168 Benchmark]: RCFGBuilder took 317.75 ms. Allocated memory is still 199.2 MB. Free memory was 178.5 MB in the beginning and 165.0 MB in the end (delta: 13.5 MB). Peak memory consumption was 13.5 MB. Max. memory is 7.1 GB. [2020-07-18 04:41:08,478 INFO L168 Benchmark]: TraceAbstraction took 1238.28 ms. Allocated memory was 199.2 MB in the beginning and 228.1 MB in the end (delta: 28.8 MB). Free memory was 165.0 MB in the beginning and 180.8 MB in the end (delta: -15.8 MB). Peak memory consumption was 13.0 MB. Max. memory is 7.1 GB. [2020-07-18 04:41:08,482 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 1.06 ms. Allocated memory is still 136.3 MB. Free memory was 119.7 MB in the beginning and 119.5 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 220.49 ms. Allocated memory is still 136.3 MB. Free memory was 101.4 MB in the beginning and 92.2 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 107.41 ms. Allocated memory was 136.3 MB in the beginning and 199.2 MB in the end (delta: 62.9 MB). Free memory was 92.2 MB in the beginning and 178.5 MB in the end (delta: -86.3 MB). Peak memory consumption was 14.8 MB. Max. memory is 7.1 GB. * RCFGBuilder took 317.75 ms. Allocated memory is still 199.2 MB. Free memory was 178.5 MB in the beginning and 165.0 MB in the end (delta: 13.5 MB). Peak memory consumption was 13.5 MB. Max. memory is 7.1 GB. * TraceAbstraction took 1238.28 ms. Allocated memory was 199.2 MB in the beginning and 228.1 MB in the end (delta: 28.8 MB). Free memory was 165.0 MB in the beginning and 180.8 MB in the end (delta: -15.8 MB). Peak memory consumption was 13.0 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 7]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L11] CALL f(4) VAL [\old(n)=4] [L4] COND FALSE !(n<3) VAL [\old(n)=4, n=4] [L5] n-- VAL [\old(n)=4, n=3] [L6] CALL f(n) VAL [\old(n)=3] [L4] COND FALSE !(n<3) VAL [\old(n)=3, n=3] [L5] n-- VAL [\old(n)=3, n=2] [L6] CALL f(n) VAL [\old(n)=2] [L4] COND TRUE n<3 VAL [\old(n)=2, n=2] [L6] RET f(n) VAL [\old(n)=3, n=2] [L7] __VERIFIER_error() VAL [\old(n)=3, n=2] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 19 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 1.1s, OverallIterations: 2, TraceHistogramMax: 3, AutomataDifference: 0.4s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 9 SDtfs, 13 SDslu, 43 SDs, 0 SdLazy, 43 SolverSat, 5 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 17 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=21occurred in iteration=1, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 1 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.2s InterpolantComputationTime, 38 NumberOfCodeBlocks, 38 NumberOfCodeBlocksAsserted, 2 NumberOfCheckSat, 15 ConstructedInterpolants, 0 QuantifiedInterpolants, 495 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 1 InterpolantComputations, 0 PerfectInterpolantSequences, 0/2 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...