/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 enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=HIGHLEXORDER --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 18:56:59,907 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 18:56:59,910 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 18:56:59,933 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 18:56:59,934 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 18:56:59,935 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 18:56:59,936 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 18:56:59,938 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 18:56:59,939 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 18:56:59,940 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 18:56:59,941 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 18:56:59,942 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 18:56:59,943 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 18:56:59,946 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 18:56:59,947 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 18:56:59,948 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 18:56:59,948 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 18:56:59,949 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 18:56:59,951 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 18:56:59,953 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 18:56:59,957 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 18:56:59,959 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 18:56:59,961 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 18:56:59,962 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 18:56:59,967 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-21 18:56:59,968 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-21 18:56:59,969 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-21 18:56:59,972 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-21 18:56:59,973 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-21 18:56:59,974 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-21 18:56:59,974 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-21 18:56:59,974 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-21 18:56:59,975 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-21 18:56:59,978 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-21 18:56:59,979 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-21 18:56:59,979 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-21 18:56:59,979 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-21 18:56:59,980 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-21 18:56:59,980 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 18:56:59,981 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 18:56:59,983 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 18:56:59,990 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 18:57:00,032 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 18:57:00,032 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 18:57:00,034 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 18:57:00,034 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 18:57:00,035 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 18:57:00,035 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 18:57:00,035 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 18:57:00,035 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 18:57:00,036 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 18:57:00,036 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 18:57:00,037 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 18:57:00,037 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 18:57:00,037 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 18:57:00,038 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 18:57:00,038 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 18:57:00,038 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 18:57:00,038 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 18:57:00,038 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 18:57:00,039 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 18:57:00,039 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 18:57:00,039 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 18:57:00,039 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 18:57:00,039 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 18:57:00,040 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 18:57:00,040 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 18:57:00,040 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 18:57:00,040 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 18:57:00,040 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 18:57:00,041 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 18:57:00,041 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 -> enumeration-timeout=5000;interpolation-heuristic=HIGHLEXORDER;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=HIGHLEXORDER;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=HIGHLEXORDER;log-additional-information=true; [2020-08-21 18:57:00,349 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 18:57:00,362 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 18:57:00,370 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 18:57:00,372 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 18:57:00,372 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 18:57:00,373 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/verifythis/tree_del_rec.c [2020-08-21 18:57:00,454 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/252dc7e76/f695f80d11f24c0a89c20963c8aedb3a/FLAGe4a79b7d2 [2020-08-21 18:57:00,996 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 18:57:00,996 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/verifythis/tree_del_rec.c [2020-08-21 18:57:01,007 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/252dc7e76/f695f80d11f24c0a89c20963c8aedb3a/FLAGe4a79b7d2 [2020-08-21 18:57:01,274 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/252dc7e76/f695f80d11f24c0a89c20963c8aedb3a [2020-08-21 18:57:01,281 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 18:57:01,283 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 18:57:01,284 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 18:57:01,284 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 18:57:01,288 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 18:57:01,289 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 06:57:01" (1/1) ... [2020-08-21 18:57:01,292 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4b1303a5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:57:01, skipping insertion in model container [2020-08-21 18:57:01,292 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 06:57:01" (1/1) ... [2020-08-21 18:57:01,300 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 18:57:01,330 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 18:57:01,529 WARN L1484 CHandler]: Possible shadowing of function min [2020-08-21 18:57:01,531 WARN L1484 CHandler]: Possible shadowing of function min [2020-08-21 18:57:01,552 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 18:57:01,568 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 18:57:01,673 WARN L1484 CHandler]: Possible shadowing of function min [2020-08-21 18:57:01,675 WARN L1484 CHandler]: Possible shadowing of function min [2020-08-21 18:57:01,686 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 18:57:01,706 INFO L208 MainTranslator]: Completed translation [2020-08-21 18:57:01,707 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:57:01 WrapperNode [2020-08-21 18:57:01,707 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 18:57:01,707 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 18:57:01,708 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 18:57:01,708 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 18:57:01,720 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:57:01" (1/1) ... [2020-08-21 18:57:01,720 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:57:01" (1/1) ... [2020-08-21 18:57:01,732 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:57:01" (1/1) ... [2020-08-21 18:57:01,732 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:57:01" (1/1) ... [2020-08-21 18:57:01,754 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:57:01" (1/1) ... [2020-08-21 18:57:01,766 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:57:01" (1/1) ... [2020-08-21 18:57:01,769 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:57:01" (1/1) ... [2020-08-21 18:57:01,778 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 18:57:01,778 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 18:57:01,778 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 18:57:01,779 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 18:57:01,780 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:57:01" (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 18:57:01,846 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 18:57:01,847 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 18:57:01,847 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_cycle_if_not [2020-08-21 18:57:01,847 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-21 18:57:01,847 INFO L138 BoogieDeclarations]: Found implementation of procedure nondet_tree [2020-08-21 18:57:01,847 INFO L138 BoogieDeclarations]: Found implementation of procedure min [2020-08-21 18:57:01,847 INFO L138 BoogieDeclarations]: Found implementation of procedure tree_del [2020-08-21 18:57:01,848 INFO L138 BoogieDeclarations]: Found implementation of procedure tree_inorder [2020-08-21 18:57:01,848 INFO L138 BoogieDeclarations]: Found implementation of procedure size [2020-08-21 18:57:01,848 INFO L138 BoogieDeclarations]: Found implementation of procedure task [2020-08-21 18:57:01,848 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 18:57:01,848 INFO L138 BoogieDeclarations]: Found implementation of procedure #Ultimate.meminit [2020-08-21 18:57:01,848 INFO L130 BoogieDeclarations]: Found specification of procedure calloc [2020-08-21 18:57:01,849 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-08-21 18:57:01,849 INFO L130 BoogieDeclarations]: Found specification of procedure free [2020-08-21 18:57:01,849 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-21 18:57:01,849 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2020-08-21 18:57:01,849 INFO L130 BoogieDeclarations]: Found specification of procedure assume_cycle_if_not [2020-08-21 18:57:01,849 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 18:57:01,850 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-21 18:57:01,850 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_tree [2020-08-21 18:57:01,850 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-08-21 18:57:01,850 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-21 18:57:01,850 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-08-21 18:57:01,850 INFO L130 BoogieDeclarations]: Found specification of procedure min [2020-08-21 18:57:01,850 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-21 18:57:01,851 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-08-21 18:57:01,851 INFO L130 BoogieDeclarations]: Found specification of procedure tree_del [2020-08-21 18:57:01,851 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-21 18:57:01,851 INFO L130 BoogieDeclarations]: Found specification of procedure tree_inorder [2020-08-21 18:57:01,851 INFO L130 BoogieDeclarations]: Found specification of procedure size [2020-08-21 18:57:01,851 INFO L130 BoogieDeclarations]: Found specification of procedure task [2020-08-21 18:57:01,852 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-21 18:57:01,852 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.meminit [2020-08-21 18:57:01,852 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 18:57:01,852 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 18:57:01,852 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 18:57:02,429 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 18:57:02,430 INFO L295 CfgBuilder]: Removed 2 assume(true) statements. [2020-08-21 18:57:02,438 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 06:57:02 BoogieIcfgContainer [2020-08-21 18:57:02,439 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 18:57:02,440 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 18:57:02,440 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 18:57:02,444 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 18:57:02,444 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 06:57:01" (1/3) ... [2020-08-21 18:57:02,445 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@666e420a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 06:57:02, skipping insertion in model container [2020-08-21 18:57:02,446 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:57:01" (2/3) ... [2020-08-21 18:57:02,446 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@666e420a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 06:57:02, skipping insertion in model container [2020-08-21 18:57:02,446 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 06:57:02" (3/3) ... [2020-08-21 18:57:02,448 INFO L109 eAbstractionObserver]: Analyzing ICFG tree_del_rec.c [2020-08-21 18:57:02,460 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 18:57:02,469 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 18:57:02,484 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 18:57:02,510 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 18:57:02,511 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 18:57:02,511 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 18:57:02,511 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 18:57:02,511 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 18:57:02,512 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 18:57:02,512 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 18:57:02,512 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 18:57:02,535 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states. [2020-08-21 18:57:02,544 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-21 18:57:02,544 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:57:02,546 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 18:57:02,546 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:57:02,553 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:57:02,553 INFO L82 PathProgramCache]: Analyzing trace with hash -1057238675, now seen corresponding path program 1 times [2020-08-21 18:57:02,563 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:57:02,564 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1968154630] [2020-08-21 18:57:02,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:57:02,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:02,832 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:57:02,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:02,862 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 18:57:02,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:02,878 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-08-21 18:57:02,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:02,893 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2020-08-21 18:57:02,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:02,952 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-08-21 18:57:02,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:03,023 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2020-08-21 18:57:03,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:03,060 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 34 [2020-08-21 18:57:03,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:03,083 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 18:57:03,083 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1968154630] [2020-08-21 18:57:03,086 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 18:57:03,086 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2020-08-21 18:57:03,087 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [787776795] [2020-08-21 18:57:03,093 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 18:57:03,093 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:57:03,111 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 18:57:03,112 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2020-08-21 18:57:03,115 INFO L87 Difference]: Start difference. First operand 97 states. Second operand 11 states. [2020-08-21 18:57:03,974 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:57:03,975 INFO L93 Difference]: Finished difference Result 171 states and 229 transitions. [2020-08-21 18:57:03,975 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 18:57:03,977 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 44 [2020-08-21 18:57:03,978 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:57:03,999 INFO L225 Difference]: With dead ends: 171 [2020-08-21 18:57:03,999 INFO L226 Difference]: Without dead ends: 96 [2020-08-21 18:57:04,006 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 18:57:04,027 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-08-21 18:57:04,110 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 90. [2020-08-21 18:57:04,112 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2020-08-21 18:57:04,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 114 transitions. [2020-08-21 18:57:04,124 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 114 transitions. Word has length 44 [2020-08-21 18:57:04,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:57:04,125 INFO L479 AbstractCegarLoop]: Abstraction has 90 states and 114 transitions. [2020-08-21 18:57:04,125 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 18:57:04,125 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 114 transitions. [2020-08-21 18:57:04,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-21 18:57:04,134 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:57:04,135 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 18:57:04,135 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 18:57:04,135 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:57:04,136 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:57:04,137 INFO L82 PathProgramCache]: Analyzing trace with hash 1861604494, now seen corresponding path program 1 times [2020-08-21 18:57:04,137 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:57:04,138 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1567262463] [2020-08-21 18:57:04,139 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:57:04,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:04,337 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:57:04,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:04,361 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 18:57:04,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:04,392 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-08-21 18:57:04,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:04,398 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2020-08-21 18:57:04,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:04,450 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:57:04,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:04,455 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-08-21 18:57:04,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:04,461 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 35 [2020-08-21 18:57:04,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:04,478 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2020-08-21 18:57:04,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:04,515 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 46 [2020-08-21 18:57:04,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:04,525 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 18:57:04,526 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1567262463] [2020-08-21 18:57:04,526 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:57:04,526 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 18:57:04,527 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [853818560] [2020-08-21 18:57:04,528 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 18:57:04,529 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:57:04,529 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 18:57:04,529 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=108, Unknown=0, NotChecked=0, Total=132 [2020-08-21 18:57:04,530 INFO L87 Difference]: Start difference. First operand 90 states and 114 transitions. Second operand 12 states. [2020-08-21 18:57:05,367 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:57:05,368 INFO L93 Difference]: Finished difference Result 162 states and 208 transitions. [2020-08-21 18:57:05,368 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 18:57:05,368 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 56 [2020-08-21 18:57:05,369 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:57:05,372 INFO L225 Difference]: With dead ends: 162 [2020-08-21 18:57:05,373 INFO L226 Difference]: Without dead ends: 95 [2020-08-21 18:57:05,375 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 18:57:05,376 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2020-08-21 18:57:05,390 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 92. [2020-08-21 18:57:05,391 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2020-08-21 18:57:05,392 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 117 transitions. [2020-08-21 18:57:05,392 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 117 transitions. Word has length 56 [2020-08-21 18:57:05,393 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:57:05,393 INFO L479 AbstractCegarLoop]: Abstraction has 92 states and 117 transitions. [2020-08-21 18:57:05,393 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 18:57:05,393 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 117 transitions. [2020-08-21 18:57:05,395 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-08-21 18:57:05,396 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:57:05,396 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 18:57:05,396 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 18:57:05,397 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:57:05,397 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:57:05,397 INFO L82 PathProgramCache]: Analyzing trace with hash 1883823467, now seen corresponding path program 1 times [2020-08-21 18:57:05,397 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:57:05,398 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1571053736] [2020-08-21 18:57:05,398 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:57:05,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:05,465 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:57:05,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:05,482 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 18:57:05,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:05,551 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2020-08-21 18:57:05,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:05,558 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 18:57:05,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:05,564 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2020-08-21 18:57:05,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:05,587 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2020-08-21 18:57:05,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:05,595 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:57:05,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:05,598 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-08-21 18:57:05,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:05,601 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 45 [2020-08-21 18:57:05,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:05,613 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 51 [2020-08-21 18:57:05,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:05,636 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 56 [2020-08-21 18:57:05,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:05,646 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 18:57:05,646 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1571053736] [2020-08-21 18:57:05,646 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 18:57:05,647 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2020-08-21 18:57:05,647 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1859828538] [2020-08-21 18:57:05,648 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 18:57:05,648 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:57:05,648 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 18:57:05,649 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=130, Unknown=0, NotChecked=0, Total=156 [2020-08-21 18:57:05,649 INFO L87 Difference]: Start difference. First operand 92 states and 117 transitions. Second operand 13 states. [2020-08-21 18:57:06,442 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:57:06,443 INFO L93 Difference]: Finished difference Result 161 states and 207 transitions. [2020-08-21 18:57:06,443 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-21 18:57:06,443 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 66 [2020-08-21 18:57:06,444 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:57:06,449 INFO L225 Difference]: With dead ends: 161 [2020-08-21 18:57:06,449 INFO L226 Difference]: Without dead ends: 97 [2020-08-21 18:57:06,454 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 18:57:06,456 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2020-08-21 18:57:06,472 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 94. [2020-08-21 18:57:06,472 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2020-08-21 18:57:06,473 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 120 transitions. [2020-08-21 18:57:06,474 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 120 transitions. Word has length 66 [2020-08-21 18:57:06,474 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:57:06,474 INFO L479 AbstractCegarLoop]: Abstraction has 94 states and 120 transitions. [2020-08-21 18:57:06,474 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 18:57:06,475 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 120 transitions. [2020-08-21 18:57:06,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2020-08-21 18:57:06,478 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:57:06,478 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 18:57:06,479 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 18:57:06,479 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:57:06,479 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:57:06,479 INFO L82 PathProgramCache]: Analyzing trace with hash 1030140767, now seen corresponding path program 1 times [2020-08-21 18:57:06,480 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:57:06,480 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1094303134] [2020-08-21 18:57:06,480 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:57:06,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:06,563 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:57:06,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:06,580 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 18:57:06,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:06,628 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2020-08-21 18:57:06,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:06,634 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 18:57:06,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:06,640 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2020-08-21 18:57:06,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:06,649 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:57:06,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:06,652 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-08-21 18:57:06,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:06,655 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 40 [2020-08-21 18:57:06,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:06,665 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:57:06,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:06,667 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-08-21 18:57:06,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:06,670 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 58 [2020-08-21 18:57:06,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:06,685 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 64 [2020-08-21 18:57:06,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:06,707 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 69 [2020-08-21 18:57:06,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:06,740 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 18:57:06,741 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1094303134] [2020-08-21 18:57:06,741 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 18:57:06,741 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2020-08-21 18:57:06,741 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1057563737] [2020-08-21 18:57:06,742 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 18:57:06,742 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:57:06,743 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 18:57:06,743 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=130, Unknown=0, NotChecked=0, Total=156 [2020-08-21 18:57:06,743 INFO L87 Difference]: Start difference. First operand 94 states and 120 transitions. Second operand 13 states. [2020-08-21 18:57:07,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:57:07,517 INFO L93 Difference]: Finished difference Result 149 states and 191 transitions. [2020-08-21 18:57:07,517 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-21 18:57:07,517 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 79 [2020-08-21 18:57:07,518 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:57:07,520 INFO L225 Difference]: With dead ends: 149 [2020-08-21 18:57:07,520 INFO L226 Difference]: Without dead ends: 97 [2020-08-21 18:57:07,522 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 18:57:07,522 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2020-08-21 18:57:07,535 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 96. [2020-08-21 18:57:07,535 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2020-08-21 18:57:07,537 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 123 transitions. [2020-08-21 18:57:07,537 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 123 transitions. Word has length 79 [2020-08-21 18:57:07,538 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:57:07,538 INFO L479 AbstractCegarLoop]: Abstraction has 96 states and 123 transitions. [2020-08-21 18:57:07,538 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 18:57:07,538 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 123 transitions. [2020-08-21 18:57:07,540 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2020-08-21 18:57:07,541 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:57:07,541 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 18:57:07,541 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 18:57:07,541 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:57:07,542 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:57:07,542 INFO L82 PathProgramCache]: Analyzing trace with hash -299285422, now seen corresponding path program 1 times [2020-08-21 18:57:07,542 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:57:07,542 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1317469825] [2020-08-21 18:57:07,543 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:57:07,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-21 18:57:07,583 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-21 18:57:07,586 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-21 18:57:07,591 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 18:57:07,630 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.08 06:57:07 BoogieIcfgContainer [2020-08-21 18:57:07,630 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-21 18:57:07,635 INFO L168 Benchmark]: Toolchain (without parser) took 6349.81 ms. Allocated memory was 141.0 MB in the beginning and 279.4 MB in the end (delta: 138.4 MB). Free memory was 104.1 MB in the beginning and 196.8 MB in the end (delta: -92.7 MB). Peak memory consumption was 45.7 MB. Max. memory is 7.1 GB. [2020-08-21 18:57:07,637 INFO L168 Benchmark]: CDTParser took 0.23 ms. Allocated memory is still 141.0 MB. Free memory was 122.6 MB in the beginning and 122.4 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. [2020-08-21 18:57:07,640 INFO L168 Benchmark]: CACSL2BoogieTranslator took 423.47 ms. Allocated memory was 141.0 MB in the beginning and 202.9 MB in the end (delta: 61.9 MB). Free memory was 103.9 MB in the beginning and 179.1 MB in the end (delta: -75.2 MB). Peak memory consumption was 22.1 MB. Max. memory is 7.1 GB. [2020-08-21 18:57:07,645 INFO L168 Benchmark]: Boogie Preprocessor took 70.40 ms. Allocated memory is still 202.9 MB. Free memory was 179.1 MB in the beginning and 176.5 MB in the end (delta: 2.6 MB). Peak memory consumption was 2.6 MB. Max. memory is 7.1 GB. [2020-08-21 18:57:07,647 INFO L168 Benchmark]: RCFGBuilder took 660.68 ms. Allocated memory is still 202.9 MB. Free memory was 176.5 MB in the beginning and 142.3 MB in the end (delta: 34.2 MB). Peak memory consumption was 34.2 MB. Max. memory is 7.1 GB. [2020-08-21 18:57:07,649 INFO L168 Benchmark]: TraceAbstraction took 5190.33 ms. Allocated memory was 202.9 MB in the beginning and 279.4 MB in the end (delta: 76.5 MB). Free memory was 141.7 MB in the beginning and 196.8 MB in the end (delta: -55.1 MB). Peak memory consumption was 21.4 MB. Max. memory is 7.1 GB. [2020-08-21 18:57:07,664 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.23 ms. Allocated memory is still 141.0 MB. Free memory was 122.6 MB in the beginning and 122.4 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 423.47 ms. Allocated memory was 141.0 MB in the beginning and 202.9 MB in the end (delta: 61.9 MB). Free memory was 103.9 MB in the beginning and 179.1 MB in the end (delta: -75.2 MB). Peak memory consumption was 22.1 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 70.40 ms. Allocated memory is still 202.9 MB. Free memory was 179.1 MB in the beginning and 176.5 MB in the end (delta: 2.6 MB). Peak memory consumption was 2.6 MB. Max. memory is 7.1 GB. * RCFGBuilder took 660.68 ms. Allocated memory is still 202.9 MB. Free memory was 176.5 MB in the beginning and 142.3 MB in the end (delta: 34.2 MB). Peak memory consumption was 34.2 MB. Max. memory is 7.1 GB. * TraceAbstraction took 5190.33 ms. Allocated memory was 202.9 MB in the beginning and 279.4 MB in the end (delta: 76.5 MB). Free memory was 141.7 MB in the beginning and 196.8 MB in the end (delta: -55.1 MB). Peak memory consumption was 21.4 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: 5.0s, OverallIterations: 5, TraceHistogramMax: 3, AutomataDifference: 3.3s, 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, 1.8s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 144 GetRequests, 72 SyntacticMatches, 0 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 95 ImplicationChecksByTransitivity, 1.2s 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, 0.2s 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...