/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/verifythis/tree_del_rec.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 14:07:17,250 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 14:07:17,254 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 14:07:17,297 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 14:07:17,297 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 14:07:17,307 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 14:07:17,310 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 14:07:17,313 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 14:07:17,316 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 14:07:17,320 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 14:07:17,321 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 14:07:17,322 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 14:07:17,322 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 14:07:17,325 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 14:07:17,327 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 14:07:17,329 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 14:07:17,330 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 14:07:17,331 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 14:07:17,333 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 14:07:17,341 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 14:07:17,343 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 14:07:17,344 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 14:07:17,345 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 14:07:17,346 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 14:07:17,361 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-21 14:07:17,361 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-21 14:07:17,361 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-21 14:07:17,362 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-21 14:07:17,363 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-21 14:07:17,364 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-21 14:07:17,364 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-21 14:07:17,365 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-21 14:07:17,365 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-21 14:07:17,366 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-21 14:07:17,367 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-21 14:07:17,367 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-21 14:07:17,368 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-21 14:07:17,368 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-21 14:07:17,368 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 14:07:17,369 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 14:07:17,370 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 14:07:17,371 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-21 14:07:17,392 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 14:07:17,392 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 14:07:17,394 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 14:07:17,394 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 14:07:17,394 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 14:07:17,394 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 14:07:17,395 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 14:07:17,395 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 14:07:17,395 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 14:07:17,395 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 14:07:17,395 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 14:07:17,396 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 14:07:17,396 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 14:07:17,396 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 14:07:17,396 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 14:07:17,396 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 14:07:17,397 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 14:07:17,397 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 14:07:17,397 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 14:07:17,397 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 14:07:17,397 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 14:07:17,397 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 14:07:17,398 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 14:07:17,398 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 14:07:17,398 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 14:07:17,398 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 14:07:17,398 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 14:07:17,399 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 14:07:17,399 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 14:07:17,399 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES 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: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> log-additional-information=true; [2020-08-21 14:07:17,701 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 14:07:17,721 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 14:07:17,727 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 14:07:17,729 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 14:07:17,730 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 14:07:17,731 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/verifythis/tree_del_rec.c [2020-08-21 14:07:17,810 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/5a7d57de3/5e9eb0e0c4ef4082ad871f74f2ab7058/FLAGf29b21323 [2020-08-21 14:07:18,292 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 14:07:18,293 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/verifythis/tree_del_rec.c [2020-08-21 14:07:18,301 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/5a7d57de3/5e9eb0e0c4ef4082ad871f74f2ab7058/FLAGf29b21323 [2020-08-21 14:07:18,652 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/5a7d57de3/5e9eb0e0c4ef4082ad871f74f2ab7058 [2020-08-21 14:07:18,660 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 14:07:18,662 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 14:07:18,663 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 14:07:18,663 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 14:07:18,667 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 14:07:18,668 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 02:07:18" (1/1) ... [2020-08-21 14:07:18,671 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@46a9d3e5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:07:18, skipping insertion in model container [2020-08-21 14:07:18,671 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 02:07:18" (1/1) ... [2020-08-21 14:07:18,679 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 14:07:18,701 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 14:07:18,913 WARN L1484 CHandler]: Possible shadowing of function min [2020-08-21 14:07:18,915 WARN L1484 CHandler]: Possible shadowing of function min [2020-08-21 14:07:18,932 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 14:07:18,949 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 14:07:19,049 WARN L1484 CHandler]: Possible shadowing of function min [2020-08-21 14:07:19,051 WARN L1484 CHandler]: Possible shadowing of function min [2020-08-21 14:07:19,064 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 14:07:19,094 INFO L208 MainTranslator]: Completed translation [2020-08-21 14:07:19,095 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:07:19 WrapperNode [2020-08-21 14:07:19,095 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 14:07:19,096 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 14:07:19,096 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 14:07:19,097 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 14:07:19,108 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:07:19" (1/1) ... [2020-08-21 14:07:19,108 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:07:19" (1/1) ... [2020-08-21 14:07:19,120 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:07:19" (1/1) ... [2020-08-21 14:07:19,121 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:07:19" (1/1) ... [2020-08-21 14:07:19,138 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:07:19" (1/1) ... [2020-08-21 14:07:19,144 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:07:19" (1/1) ... [2020-08-21 14:07:19,148 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:07:19" (1/1) ... [2020-08-21 14:07:19,152 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 14:07:19,153 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 14:07:19,153 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 14:07:19,153 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 14:07:19,154 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:07:19" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 14:07:19,224 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 14:07:19,224 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 14:07:19,224 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_cycle_if_not [2020-08-21 14:07:19,224 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-21 14:07:19,225 INFO L138 BoogieDeclarations]: Found implementation of procedure nondet_tree [2020-08-21 14:07:19,225 INFO L138 BoogieDeclarations]: Found implementation of procedure min [2020-08-21 14:07:19,225 INFO L138 BoogieDeclarations]: Found implementation of procedure tree_del [2020-08-21 14:07:19,225 INFO L138 BoogieDeclarations]: Found implementation of procedure tree_inorder [2020-08-21 14:07:19,225 INFO L138 BoogieDeclarations]: Found implementation of procedure size [2020-08-21 14:07:19,225 INFO L138 BoogieDeclarations]: Found implementation of procedure task [2020-08-21 14:07:19,226 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 14:07:19,226 INFO L138 BoogieDeclarations]: Found implementation of procedure #Ultimate.meminit [2020-08-21 14:07:19,226 INFO L130 BoogieDeclarations]: Found specification of procedure calloc [2020-08-21 14:07:19,226 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-08-21 14:07:19,226 INFO L130 BoogieDeclarations]: Found specification of procedure free [2020-08-21 14:07:19,227 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-21 14:07:19,227 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2020-08-21 14:07:19,227 INFO L130 BoogieDeclarations]: Found specification of procedure assume_cycle_if_not [2020-08-21 14:07:19,227 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 14:07:19,227 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-21 14:07:19,227 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_tree [2020-08-21 14:07:19,228 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-08-21 14:07:19,228 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-21 14:07:19,228 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-08-21 14:07:19,228 INFO L130 BoogieDeclarations]: Found specification of procedure min [2020-08-21 14:07:19,228 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-21 14:07:19,228 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-08-21 14:07:19,229 INFO L130 BoogieDeclarations]: Found specification of procedure tree_del [2020-08-21 14:07:19,229 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-21 14:07:19,229 INFO L130 BoogieDeclarations]: Found specification of procedure tree_inorder [2020-08-21 14:07:19,229 INFO L130 BoogieDeclarations]: Found specification of procedure size [2020-08-21 14:07:19,229 INFO L130 BoogieDeclarations]: Found specification of procedure task [2020-08-21 14:07:19,229 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-21 14:07:19,230 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.meminit [2020-08-21 14:07:19,230 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 14:07:19,230 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 14:07:19,230 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 14:07:19,750 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 14:07:19,751 INFO L295 CfgBuilder]: Removed 2 assume(true) statements. [2020-08-21 14:07:19,757 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 02:07:19 BoogieIcfgContainer [2020-08-21 14:07:19,757 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 14:07:19,758 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 14:07:19,759 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 14:07:19,764 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 14:07:19,764 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 02:07:18" (1/3) ... [2020-08-21 14:07:19,765 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5b304682 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 02:07:19, skipping insertion in model container [2020-08-21 14:07:19,766 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:07:19" (2/3) ... [2020-08-21 14:07:19,766 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5b304682 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 02:07:19, skipping insertion in model container [2020-08-21 14:07:19,766 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 02:07:19" (3/3) ... [2020-08-21 14:07:19,768 INFO L109 eAbstractionObserver]: Analyzing ICFG tree_del_rec.c [2020-08-21 14:07:19,779 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 14:07:19,789 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 14:07:19,803 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 14:07:19,830 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 14:07:19,831 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 14:07:19,831 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 14:07:19,831 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 14:07:19,831 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 14:07:19,831 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 14:07:19,832 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 14:07:19,832 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 14:07:19,851 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states. [2020-08-21 14:07:19,860 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-21 14:07:19,860 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:07:19,861 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:07:19,862 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:07:19,867 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:07:19,867 INFO L82 PathProgramCache]: Analyzing trace with hash -1057238675, now seen corresponding path program 1 times [2020-08-21 14:07:19,875 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:07:19,876 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1655884392] [2020-08-21 14:07:19,876 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:07:20,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:07:20,163 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:07:20,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:07:20,191 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 14:07:20,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:07:20,199 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-08-21 14:07:20,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:07:20,204 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2020-08-21 14:07:20,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:07:20,249 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-08-21 14:07:20,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:07:20,312 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2020-08-21 14:07:20,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:07:20,347 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 34 [2020-08-21 14:07:20,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:07:20,370 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:07:20,374 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1655884392] [2020-08-21 14:07:20,379 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 14:07:20,379 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2020-08-21 14:07:20,380 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1317916835] [2020-08-21 14:07:20,390 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 14:07:20,390 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:07:20,405 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 14:07:20,408 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2020-08-21 14:07:20,411 INFO L87 Difference]: Start difference. First operand 97 states. Second operand 11 states. [2020-08-21 14:07:21,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:07:21,226 INFO L93 Difference]: Finished difference Result 171 states and 229 transitions. [2020-08-21 14:07:21,226 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 14:07:21,228 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 44 [2020-08-21 14:07:21,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:07:21,245 INFO L225 Difference]: With dead ends: 171 [2020-08-21 14:07:21,245 INFO L226 Difference]: Without dead ends: 96 [2020-08-21 14:07:21,251 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=64, Invalid=208, Unknown=0, NotChecked=0, Total=272 [2020-08-21 14:07:21,273 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-08-21 14:07:21,315 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 90. [2020-08-21 14:07:21,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2020-08-21 14:07:21,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 114 transitions. [2020-08-21 14:07:21,322 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 114 transitions. Word has length 44 [2020-08-21 14:07:21,323 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:07:21,323 INFO L479 AbstractCegarLoop]: Abstraction has 90 states and 114 transitions. [2020-08-21 14:07:21,323 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 14:07:21,324 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 114 transitions. [2020-08-21 14:07:21,327 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-21 14:07:21,327 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:07:21,328 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:07:21,328 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 14:07:21,328 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:07:21,329 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:07:21,329 INFO L82 PathProgramCache]: Analyzing trace with hash 1861604494, now seen corresponding path program 1 times [2020-08-21 14:07:21,329 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:07:21,330 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [53934964] [2020-08-21 14:07:21,330 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:07:21,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:07:21,510 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:07:21,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:07:21,531 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 14:07:21,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:07:21,575 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-08-21 14:07:21,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:07:21,592 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2020-08-21 14:07:21,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:07:21,661 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 14:07:21,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:07:21,666 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-08-21 14:07:21,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:07:21,672 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 35 [2020-08-21 14:07:21,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:07:21,691 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2020-08-21 14:07:21,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:07:21,716 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 46 [2020-08-21 14:07:21,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:07:21,729 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-08-21 14:07:21,729 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [53934964] [2020-08-21 14:07:21,730 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:07:21,730 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 14:07:21,730 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1283735595] [2020-08-21 14:07:21,732 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 14:07:21,733 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:07:21,733 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 14:07:21,733 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=108, Unknown=0, NotChecked=0, Total=132 [2020-08-21 14:07:21,733 INFO L87 Difference]: Start difference. First operand 90 states and 114 transitions. Second operand 12 states. [2020-08-21 14:07:22,587 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:07:22,588 INFO L93 Difference]: Finished difference Result 162 states and 208 transitions. [2020-08-21 14:07:22,588 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 14:07:22,588 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 56 [2020-08-21 14:07:22,589 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:07:22,592 INFO L225 Difference]: With dead ends: 162 [2020-08-21 14:07:22,592 INFO L226 Difference]: Without dead ends: 95 [2020-08-21 14:07:22,594 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=89, Invalid=291, Unknown=0, NotChecked=0, Total=380 [2020-08-21 14:07:22,595 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2020-08-21 14:07:22,609 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 92. [2020-08-21 14:07:22,609 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2020-08-21 14:07:22,611 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 117 transitions. [2020-08-21 14:07:22,611 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 117 transitions. Word has length 56 [2020-08-21 14:07:22,611 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:07:22,612 INFO L479 AbstractCegarLoop]: Abstraction has 92 states and 117 transitions. [2020-08-21 14:07:22,612 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 14:07:22,612 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 117 transitions. [2020-08-21 14:07:22,614 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-08-21 14:07:22,614 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:07:22,615 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:07:22,615 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 14:07:22,615 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:07:22,615 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:07:22,615 INFO L82 PathProgramCache]: Analyzing trace with hash 1883823467, now seen corresponding path program 1 times [2020-08-21 14:07:22,616 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:07:22,616 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1259481235] [2020-08-21 14:07:22,616 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:07:22,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:07:22,681 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:07:22,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:07:22,698 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 14:07:22,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:07:22,748 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2020-08-21 14:07:22,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:07:22,754 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 14:07:22,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:07:22,760 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2020-08-21 14:07:22,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:07:22,802 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2020-08-21 14:07:22,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:07:22,810 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 14:07:22,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:07:22,812 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-08-21 14:07:22,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:07:22,815 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 45 [2020-08-21 14:07:22,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:07:22,828 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 51 [2020-08-21 14:07:22,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:07:22,847 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 56 [2020-08-21 14:07:22,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:07:22,857 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2020-08-21 14:07:22,857 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1259481235] [2020-08-21 14:07:22,858 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 14:07:22,858 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2020-08-21 14:07:22,858 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [600147640] [2020-08-21 14:07:22,859 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 14:07:22,859 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:07:22,859 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 14:07:22,860 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=130, Unknown=0, NotChecked=0, Total=156 [2020-08-21 14:07:22,860 INFO L87 Difference]: Start difference. First operand 92 states and 117 transitions. Second operand 13 states. [2020-08-21 14:07:23,610 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:07:23,610 INFO L93 Difference]: Finished difference Result 161 states and 207 transitions. [2020-08-21 14:07:23,611 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-21 14:07:23,611 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 66 [2020-08-21 14:07:23,612 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:07:23,614 INFO L225 Difference]: With dead ends: 161 [2020-08-21 14:07:23,614 INFO L226 Difference]: Without dead ends: 97 [2020-08-21 14:07:23,615 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=85, Invalid=335, Unknown=0, NotChecked=0, Total=420 [2020-08-21 14:07:23,616 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2020-08-21 14:07:23,630 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 94. [2020-08-21 14:07:23,631 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2020-08-21 14:07:23,633 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 120 transitions. [2020-08-21 14:07:23,633 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 120 transitions. Word has length 66 [2020-08-21 14:07:23,633 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:07:23,633 INFO L479 AbstractCegarLoop]: Abstraction has 94 states and 120 transitions. [2020-08-21 14:07:23,634 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 14:07:23,634 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 120 transitions. [2020-08-21 14:07:23,637 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2020-08-21 14:07:23,637 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:07:23,637 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:07:23,638 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 14:07:23,638 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:07:23,638 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:07:23,638 INFO L82 PathProgramCache]: Analyzing trace with hash 1030140767, now seen corresponding path program 1 times [2020-08-21 14:07:23,638 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:07:23,639 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2117614724] [2020-08-21 14:07:23,639 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:07:23,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:07:23,744 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:07:23,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:07:23,761 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 14:07:23,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:07:23,802 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2020-08-21 14:07:23,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:07:23,806 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 14:07:23,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:07:23,811 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2020-08-21 14:07:23,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:07:23,819 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 14:07:23,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:07:23,821 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-08-21 14:07:23,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:07:23,823 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 40 [2020-08-21 14:07:23,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:07:23,831 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 14:07:23,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:07:23,833 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-08-21 14:07:23,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:07:23,835 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 58 [2020-08-21 14:07:23,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:07:23,847 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 64 [2020-08-21 14:07:23,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:07:23,867 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 69 [2020-08-21 14:07:23,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:07:23,900 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2020-08-21 14:07:23,900 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2117614724] [2020-08-21 14:07:23,900 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 14:07:23,901 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2020-08-21 14:07:23,901 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1995083904] [2020-08-21 14:07:23,901 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 14:07:23,902 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:07:23,902 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 14:07:23,902 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=130, Unknown=0, NotChecked=0, Total=156 [2020-08-21 14:07:23,902 INFO L87 Difference]: Start difference. First operand 94 states and 120 transitions. Second operand 13 states. [2020-08-21 14:07:24,565 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:07:24,568 INFO L93 Difference]: Finished difference Result 149 states and 191 transitions. [2020-08-21 14:07:24,569 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-21 14:07:24,569 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 79 [2020-08-21 14:07:24,570 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:07:24,572 INFO L225 Difference]: With dead ends: 149 [2020-08-21 14:07:24,572 INFO L226 Difference]: Without dead ends: 97 [2020-08-21 14:07:24,574 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=91, Invalid=371, Unknown=0, NotChecked=0, Total=462 [2020-08-21 14:07:24,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2020-08-21 14:07:24,588 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 96. [2020-08-21 14:07:24,589 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2020-08-21 14:07:24,591 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 123 transitions. [2020-08-21 14:07:24,591 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 123 transitions. Word has length 79 [2020-08-21 14:07:24,592 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:07:24,592 INFO L479 AbstractCegarLoop]: Abstraction has 96 states and 123 transitions. [2020-08-21 14:07:24,592 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 14:07:24,592 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 123 transitions. [2020-08-21 14:07:24,596 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2020-08-21 14:07:24,596 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:07:24,596 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 2, 2, 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, 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] [2020-08-21 14:07:24,597 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 14:07:24,597 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:07:24,597 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:07:24,597 INFO L82 PathProgramCache]: Analyzing trace with hash -299285422, now seen corresponding path program 1 times [2020-08-21 14:07:24,598 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:07:24,598 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [521147446] [2020-08-21 14:07:24,598 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:07:24,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-21 14:07:24,638 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-21 14:07:24,639 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-21 14:07:24,643 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 14:07:24,667 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.08 02:07:24 BoogieIcfgContainer [2020-08-21 14:07:24,667 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-21 14:07:24,670 INFO L168 Benchmark]: Toolchain (without parser) took 6007.59 ms. Allocated memory was 137.4 MB in the beginning and 299.9 MB in the end (delta: 162.5 MB). Free memory was 99.7 MB in the beginning and 108.5 MB in the end (delta: -8.9 MB). Peak memory consumption was 153.7 MB. Max. memory is 7.1 GB. [2020-08-21 14:07:24,671 INFO L168 Benchmark]: CDTParser took 0.58 ms. Allocated memory is still 137.4 MB. Free memory was 118.9 MB in the beginning and 118.7 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. [2020-08-21 14:07:24,672 INFO L168 Benchmark]: CACSL2BoogieTranslator took 433.16 ms. Allocated memory was 137.4 MB in the beginning and 200.3 MB in the end (delta: 62.9 MB). Free memory was 99.5 MB in the beginning and 176.1 MB in the end (delta: -76.6 MB). Peak memory consumption was 21.7 MB. Max. memory is 7.1 GB. [2020-08-21 14:07:24,673 INFO L168 Benchmark]: Boogie Preprocessor took 56.12 ms. Allocated memory is still 200.3 MB. Free memory was 176.1 MB in the beginning and 174.0 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 7.1 GB. [2020-08-21 14:07:24,674 INFO L168 Benchmark]: RCFGBuilder took 604.34 ms. Allocated memory is still 200.3 MB. Free memory was 174.0 MB in the beginning and 139.4 MB in the end (delta: 34.6 MB). Peak memory consumption was 34.6 MB. Max. memory is 7.1 GB. [2020-08-21 14:07:24,675 INFO L168 Benchmark]: TraceAbstraction took 4908.96 ms. Allocated memory was 200.3 MB in the beginning and 299.9 MB in the end (delta: 99.6 MB). Free memory was 138.7 MB in the beginning and 108.5 MB in the end (delta: 30.2 MB). Peak memory consumption was 129.8 MB. Max. memory is 7.1 GB. [2020-08-21 14:07:24,679 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.58 ms. Allocated memory is still 137.4 MB. Free memory was 118.9 MB in the beginning and 118.7 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 433.16 ms. Allocated memory was 137.4 MB in the beginning and 200.3 MB in the end (delta: 62.9 MB). Free memory was 99.5 MB in the beginning and 176.1 MB in the end (delta: -76.6 MB). Peak memory consumption was 21.7 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 56.12 ms. Allocated memory is still 200.3 MB. Free memory was 176.1 MB in the beginning and 174.0 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 7.1 GB. * RCFGBuilder took 604.34 ms. Allocated memory is still 200.3 MB. Free memory was 174.0 MB in the beginning and 139.4 MB in the end (delta: 34.6 MB). Peak memory consumption was 34.6 MB. Max. memory is 7.1 GB. * TraceAbstraction took 4908.96 ms. Allocated memory was 200.3 MB in the beginning and 299.9 MB in the end (delta: 99.6 MB). Free memory was 138.7 MB in the beginning and 108.5 MB in the end (delta: 30.2 MB). Peak memory consumption was 129.8 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 14]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L100] CALL, EXPR nondet_tree() [L23] COND FALSE !(__VERIFIER_nondet_bool()) [L26] struct node *n = (struct node *)malloc(sizeof(struct node)); [L27] n->data = __VERIFIER_nondet_int() [L28] CALL, EXPR nondet_tree() [L23] COND TRUE __VERIFIER_nondet_bool() [L24] return 0; [L28] RET, EXPR nondet_tree() [L28] n->left = nondet_tree() [L29] CALL, EXPR nondet_tree() [L23] COND TRUE __VERIFIER_nondet_bool() [L24] return 0; [L29] RET, EXPR nondet_tree() [L29] n->right = nondet_tree() [L30] return n; [L100] RET, EXPR nondet_tree() [L100] CALL task(nondet_tree()) [L76] CALL, EXPR min(t) [L35] COND FALSE !(!n) [L38] EXPR n->data [L38] int a = n->data; [L39] EXPR n->left [L39] CALL, EXPR min(n->left) [L35] COND TRUE !n [L36] return 2147483647; [L39] RET, EXPR min(n->left) [L39] int b = min(n->left); [L40] EXPR n->right [L40] CALL, EXPR min(n->right) [L35] COND TRUE !n [L36] return 2147483647; [L40] RET, EXPR min(n->right) [L40] int c = min(n->right); [L41] COND TRUE b <= a && b <= c [L41] return b; [L76] RET, EXPR min(t) [L76] int a = min(t); [L77] int b; [L79] CALL, EXPR size(t) [L71] COND FALSE !(!t) [L72] EXPR t->left [L72] CALL, EXPR size(t->left) [L71] COND TRUE !t [L71] return 0; [L72] RET, EXPR size(t->left) [L72] EXPR t->right [L72] CALL, EXPR size(t->right) [L71] COND TRUE !t [L71] return 0; [L72] RET, EXPR size(t->right) [L72] return size(t->left) + size(t->right) + 1; [L79] RET, EXPR size(t) [L79] int n = size(t); [L80] CALL assume_cycle_if_not(n != 0) [L9] COND FALSE !(!cond) [L80] RET assume_cycle_if_not(n != 0) [L81] EXPR, FCALL calloc(n, sizeof(int)) [L81] int *x = calloc(n, sizeof(int)); [L82] CALL tree_inorder(t, x, n) [L60] COND FALSE !(!t) [L63] EXPR t->left [L63] CALL, EXPR tree_inorder(t->left, a, i) [L60] COND TRUE !t [L61] return i; [L63] RET, EXPR tree_inorder(t->left, a, i) [L63] i = tree_inorder(t->left, a, i) [L64] EXPR i++ [L64] EXPR t->data [L64] a[i++] = t->data [L65] EXPR t->right [L65] CALL, EXPR tree_inorder(t->right, a, i) [L60] COND TRUE !t [L61] return i; [L65] RET, EXPR tree_inorder(t->right, a, i) [L65] i = tree_inorder(t->right, a, i) [L66] return i; [L82] RET tree_inorder(t, x, n) [L83] EXPR x[0] [L83] CALL __VERIFIER_assert(a == x[0]) [L14] COND TRUE !cond [L14] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 12 procedures, 97 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 4.8s, OverallIterations: 5, TraceHistogramMax: 3, AutomataDifference: 3.1s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 352 SDtfs, 601 SDslu, 1435 SDs, 0 SdLazy, 1794 SolverSat, 590 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.7s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 144 GetRequests, 72 SyntacticMatches, 0 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 95 ImplicationChecksByTransitivity, 1.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=97occurred 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: 0.1s AutomataMinimizationTime, 4 MinimizatonAttempts, 13 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 1.0s InterpolantComputationTime, 336 NumberOfCodeBlocks, 336 NumberOfCodeBlocksAsserted, 5 NumberOfCheckSat, 241 ConstructedInterpolants, 0 QuantifiedInterpolants, 45981 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 4 InterpolantComputations, 3 PerfectInterpolantSequences, 64/66 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...