/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=5 --traceabstraction.additional.smt.options interpolation-heuristic=WIDEST -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/verifythis/tree_del_iter.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-18 22:52:24,738 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 22:52:24,741 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 22:52:24,765 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-18 22:52:24,765 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-18 22:52:24,766 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-18 22:52:24,768 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-18 22:52:24,769 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-18 22:52:24,771 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-18 22:52:24,772 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-18 22:52:24,773 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-18 22:52:24,774 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-18 22:52:24,774 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 22:52:24,775 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 22:52:24,776 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 22:52:24,777 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 22:52:24,778 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 22:52:24,779 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 22:52:24,780 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 22:52:24,782 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 22:52:24,784 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 22:52:24,785 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 22:52:24,786 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 22:52:24,786 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 22:52:24,789 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-18 22:52:24,789 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-18 22:52:24,789 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-18 22:52:24,790 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-18 22:52:24,791 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-18 22:52:24,791 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-18 22:52:24,792 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-18 22:52:24,792 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-18 22:52:24,793 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-18 22:52:24,794 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-18 22:52:24,795 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-18 22:52:24,795 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-18 22:52:24,795 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-18 22:52:24,796 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-18 22:52:24,796 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 22:52:24,797 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 22:52:24,797 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 22:52:24,798 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 [2020-08-18 22:52:24,825 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 22:52:24,825 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 22:52:24,826 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 22:52:24,830 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 22:52:24,830 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 22:52:24,830 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 22:52:24,830 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 22:52:24,831 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 22:52:24,831 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 22:52:24,831 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 22:52:24,831 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 22:52:24,831 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 22:52:24,832 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 22:52:24,832 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 22:52:24,832 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 22:52:24,832 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 22:52:24,832 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 22:52:24,833 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 22:52:24,835 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 22:52:24,835 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 22:52:24,835 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 22:52:24,835 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 22:52:24,836 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 22:52:24,836 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 22:52:24,836 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 22:52:24,836 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 22:52:24,836 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 22:52:24,837 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 22:52:24,837 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 22:52:24,837 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=5;interpolation-heuristic=WIDEST; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=WIDEST; [2020-08-18 22:52:25,169 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 22:52:25,179 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 22:52:25,183 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 22:52:25,186 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 22:52:25,186 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 22:52:25,187 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/verifythis/tree_del_iter.c [2020-08-18 22:52:25,254 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/7370de6df/4a2e57c56dd8469fa4d552545700c570/FLAG344efa8b5 [2020-08-18 22:52:25,714 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 22:52:25,715 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/verifythis/tree_del_iter.c [2020-08-18 22:52:25,723 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/7370de6df/4a2e57c56dd8469fa4d552545700c570/FLAG344efa8b5 [2020-08-18 22:52:26,040 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/7370de6df/4a2e57c56dd8469fa4d552545700c570 [2020-08-18 22:52:26,051 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 22:52:26,053 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 22:52:26,054 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 22:52:26,054 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 22:52:26,057 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 22:52:26,058 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 10:52:26" (1/1) ... [2020-08-18 22:52:26,061 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4e33f227 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:52:26, skipping insertion in model container [2020-08-18 22:52:26,061 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 10:52:26" (1/1) ... [2020-08-18 22:52:26,071 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 22:52:26,098 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 22:52:26,322 WARN L1484 CHandler]: Possible shadowing of function min [2020-08-18 22:52:26,359 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 22:52:26,382 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 22:52:26,499 WARN L1484 CHandler]: Possible shadowing of function min [2020-08-18 22:52:26,510 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 22:52:26,531 INFO L208 MainTranslator]: Completed translation [2020-08-18 22:52:26,531 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:52:26 WrapperNode [2020-08-18 22:52:26,532 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 22:52:26,532 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 22:52:26,533 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 22:52:26,533 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 22:52:26,544 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:52:26" (1/1) ... [2020-08-18 22:52:26,544 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:52:26" (1/1) ... [2020-08-18 22:52:26,573 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:52:26" (1/1) ... [2020-08-18 22:52:26,573 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:52:26" (1/1) ... [2020-08-18 22:52:26,605 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:52:26" (1/1) ... [2020-08-18 22:52:26,611 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:52:26" (1/1) ... [2020-08-18 22:52:26,614 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:52:26" (1/1) ... [2020-08-18 22:52:26,619 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 22:52:26,619 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 22:52:26,619 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 22:52:26,620 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 22:52:26,621 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:52:26" (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 [2020-08-18 22:52:26,677 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 22:52:26,678 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 22:52:26,678 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_cycle_if_not [2020-08-18 22:52:26,678 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-18 22:52:26,678 INFO L138 BoogieDeclarations]: Found implementation of procedure nondet_tree [2020-08-18 22:52:26,678 INFO L138 BoogieDeclarations]: Found implementation of procedure min [2020-08-18 22:52:26,678 INFO L138 BoogieDeclarations]: Found implementation of procedure tree_del [2020-08-18 22:52:26,679 INFO L138 BoogieDeclarations]: Found implementation of procedure tree_inorder [2020-08-18 22:52:26,679 INFO L138 BoogieDeclarations]: Found implementation of procedure size [2020-08-18 22:52:26,679 INFO L138 BoogieDeclarations]: Found implementation of procedure task [2020-08-18 22:52:26,679 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 22:52:26,679 INFO L138 BoogieDeclarations]: Found implementation of procedure #Ultimate.meminit [2020-08-18 22:52:26,680 INFO L130 BoogieDeclarations]: Found specification of procedure calloc [2020-08-18 22:52:26,680 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-08-18 22:52:26,680 INFO L130 BoogieDeclarations]: Found specification of procedure free [2020-08-18 22:52:26,680 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-18 22:52:26,680 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2020-08-18 22:52:26,680 INFO L130 BoogieDeclarations]: Found specification of procedure assume_cycle_if_not [2020-08-18 22:52:26,680 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 22:52:26,681 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-18 22:52:26,681 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_tree [2020-08-18 22:52:26,681 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-08-18 22:52:26,681 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-18 22:52:26,681 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-08-18 22:52:26,682 INFO L130 BoogieDeclarations]: Found specification of procedure min [2020-08-18 22:52:26,682 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-18 22:52:26,682 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-08-18 22:52:26,682 INFO L130 BoogieDeclarations]: Found specification of procedure tree_del [2020-08-18 22:52:26,682 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-18 22:52:26,682 INFO L130 BoogieDeclarations]: Found specification of procedure tree_inorder [2020-08-18 22:52:26,682 INFO L130 BoogieDeclarations]: Found specification of procedure size [2020-08-18 22:52:26,683 INFO L130 BoogieDeclarations]: Found specification of procedure task [2020-08-18 22:52:26,683 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-18 22:52:26,683 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.meminit [2020-08-18 22:52:26,683 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 22:52:26,683 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 22:52:26,683 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 22:52:27,218 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 22:52:27,218 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-18 22:52:27,224 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 10:52:27 BoogieIcfgContainer [2020-08-18 22:52:27,224 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 22:52:27,225 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 22:52:27,225 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 22:52:27,229 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 22:52:27,229 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 10:52:26" (1/3) ... [2020-08-18 22:52:27,230 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@428ff7fc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 10:52:27, skipping insertion in model container [2020-08-18 22:52:27,230 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:52:26" (2/3) ... [2020-08-18 22:52:27,230 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@428ff7fc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 10:52:27, skipping insertion in model container [2020-08-18 22:52:27,231 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 10:52:27" (3/3) ... [2020-08-18 22:52:27,232 INFO L109 eAbstractionObserver]: Analyzing ICFG tree_del_iter.c [2020-08-18 22:52:27,243 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 22:52:27,251 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 22:52:27,266 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 22:52:27,292 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 22:52:27,292 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 22:52:27,292 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 22:52:27,293 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 22:52:27,293 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 22:52:27,294 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 22:52:27,294 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 22:52:27,294 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 22:52:27,320 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states. [2020-08-18 22:52:27,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-18 22:52:27,330 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:52:27,331 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] [2020-08-18 22:52:27,332 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:52:27,337 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:52:27,337 INFO L82 PathProgramCache]: Analyzing trace with hash 806421993, now seen corresponding path program 1 times [2020-08-18 22:52:27,344 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:52:27,344 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2049203409] [2020-08-18 22:52:27,345 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:52:27,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:52:27,611 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:52:27,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:52:27,639 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-18 22:52:27,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:52:27,647 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-08-18 22:52:27,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:52:27,652 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2020-08-18 22:52:27,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:52:27,691 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-08-18 22:52:27,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:52:27,758 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2020-08-18 22:52:27,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:52:27,791 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 34 [2020-08-18 22:52:27,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:52:27,813 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:52:27,814 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2049203409] [2020-08-18 22:52:27,816 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 22:52:27,817 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2020-08-18 22:52:27,818 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1408936249] [2020-08-18 22:52:27,823 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-18 22:52:27,823 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:52:27,838 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-18 22:52:27,839 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2020-08-18 22:52:27,842 INFO L87 Difference]: Start difference. First operand 98 states. Second operand 11 states. [2020-08-18 22:52:28,609 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:52:28,609 INFO L93 Difference]: Finished difference Result 174 states and 235 transitions. [2020-08-18 22:52:28,610 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-18 22:52:28,611 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 44 [2020-08-18 22:52:28,612 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:52:28,626 INFO L225 Difference]: With dead ends: 174 [2020-08-18 22:52:28,626 INFO L226 Difference]: Without dead ends: 98 [2020-08-18 22:52:28,631 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 [2020-08-18 22:52:28,652 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-08-18 22:52:28,704 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 91. [2020-08-18 22:52:28,706 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-08-18 22:52:28,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 115 transitions. [2020-08-18 22:52:28,721 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 115 transitions. Word has length 44 [2020-08-18 22:52:28,723 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:52:28,723 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 115 transitions. [2020-08-18 22:52:28,723 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-18 22:52:28,724 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 115 transitions. [2020-08-18 22:52:28,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-18 22:52:28,733 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:52:28,734 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] [2020-08-18 22:52:28,735 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 22:52:28,735 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:52:28,736 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:52:28,736 INFO L82 PathProgramCache]: Analyzing trace with hash -1561052270, now seen corresponding path program 1 times [2020-08-18 22:52:28,736 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:52:28,738 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [382757242] [2020-08-18 22:52:28,738 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:52:28,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:52:28,886 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:52:28,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:52:28,907 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-18 22:52:28,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:52:28,939 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-08-18 22:52:28,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:52:28,945 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2020-08-18 22:52:28,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:52:28,992 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 22:52:28,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:52:28,997 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-08-18 22:52:28,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:52:29,003 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 35 [2020-08-18 22:52:29,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:52:29,043 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2020-08-18 22:52:29,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:52:29,068 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 46 [2020-08-18 22:52:29,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:52:29,078 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-08-18 22:52:29,078 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [382757242] [2020-08-18 22:52:29,079 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:52:29,079 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-18 22:52:29,079 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [530350589] [2020-08-18 22:52:29,081 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-18 22:52:29,081 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:52:29,082 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-18 22:52:29,082 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=108, Unknown=0, NotChecked=0, Total=132 [2020-08-18 22:52:29,082 INFO L87 Difference]: Start difference. First operand 91 states and 115 transitions. Second operand 12 states. [2020-08-18 22:52:29,920 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:52:29,920 INFO L93 Difference]: Finished difference Result 165 states and 211 transitions. [2020-08-18 22:52:29,921 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-18 22:52:29,921 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 56 [2020-08-18 22:52:29,921 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:52:29,924 INFO L225 Difference]: With dead ends: 165 [2020-08-18 22:52:29,924 INFO L226 Difference]: Without dead ends: 97 [2020-08-18 22:52:29,926 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 [2020-08-18 22:52:29,927 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2020-08-18 22:52:29,941 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 93. [2020-08-18 22:52:29,942 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-08-18 22:52:29,943 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 118 transitions. [2020-08-18 22:52:29,944 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 118 transitions. Word has length 56 [2020-08-18 22:52:29,944 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:52:29,944 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 118 transitions. [2020-08-18 22:52:29,944 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-18 22:52:29,944 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 118 transitions. [2020-08-18 22:52:29,947 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-08-18 22:52:29,947 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:52:29,947 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] [2020-08-18 22:52:29,947 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 22:52:29,948 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:52:29,948 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:52:29,948 INFO L82 PathProgramCache]: Analyzing trace with hash -217941329, now seen corresponding path program 1 times [2020-08-18 22:52:29,948 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:52:29,949 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [279224670] [2020-08-18 22:52:29,949 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:52:29,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:52:30,016 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:52:30,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:52:30,033 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-18 22:52:30,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:52:30,084 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2020-08-18 22:52:30,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:52:30,090 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 22:52:30,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:52:30,096 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2020-08-18 22:52:30,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:52:30,120 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2020-08-18 22:52:30,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:52:30,127 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 22:52:30,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:52:30,129 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-08-18 22:52:30,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:52:30,131 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 45 [2020-08-18 22:52:30,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:52:30,145 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 51 [2020-08-18 22:52:30,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:52:30,166 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 56 [2020-08-18 22:52:30,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:52:30,175 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2020-08-18 22:52:30,176 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [279224670] [2020-08-18 22:52:30,176 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 22:52:30,176 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2020-08-18 22:52:30,177 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [436042227] [2020-08-18 22:52:30,177 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 22:52:30,178 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:52:30,178 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 22:52:30,178 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=130, Unknown=0, NotChecked=0, Total=156 [2020-08-18 22:52:30,178 INFO L87 Difference]: Start difference. First operand 93 states and 118 transitions. Second operand 13 states. [2020-08-18 22:52:30,980 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:52:30,980 INFO L93 Difference]: Finished difference Result 164 states and 210 transitions. [2020-08-18 22:52:30,981 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-18 22:52:30,981 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 66 [2020-08-18 22:52:30,981 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:52:30,987 INFO L225 Difference]: With dead ends: 164 [2020-08-18 22:52:30,988 INFO L226 Difference]: Without dead ends: 99 [2020-08-18 22:52:30,991 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 [2020-08-18 22:52:30,992 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2020-08-18 22:52:31,015 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 95. [2020-08-18 22:52:31,017 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2020-08-18 22:52:31,018 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 121 transitions. [2020-08-18 22:52:31,019 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 121 transitions. Word has length 66 [2020-08-18 22:52:31,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:52:31,019 INFO L479 AbstractCegarLoop]: Abstraction has 95 states and 121 transitions. [2020-08-18 22:52:31,019 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 22:52:31,020 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 121 transitions. [2020-08-18 22:52:31,025 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2020-08-18 22:52:31,026 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:52:31,032 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] [2020-08-18 22:52:31,032 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 22:52:31,032 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:52:31,033 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:52:31,033 INFO L82 PathProgramCache]: Analyzing trace with hash -62868055, now seen corresponding path program 1 times [2020-08-18 22:52:31,033 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:52:31,033 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1609176580] [2020-08-18 22:52:31,033 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:52:31,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:52:31,120 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:52:31,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:52:31,137 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-18 22:52:31,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:52:31,176 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2020-08-18 22:52:31,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:52:31,181 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 22:52:31,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:52:31,186 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2020-08-18 22:52:31,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:52:31,199 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 22:52:31,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:52:31,203 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-08-18 22:52:31,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:52:31,210 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 40 [2020-08-18 22:52:31,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:52:31,221 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 22:52:31,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:52:31,228 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-08-18 22:52:31,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:52:31,231 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 58 [2020-08-18 22:52:31,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:52:31,246 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 64 [2020-08-18 22:52:31,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:52:31,262 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 69 [2020-08-18 22:52:31,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:52:31,292 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2020-08-18 22:52:31,292 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1609176580] [2020-08-18 22:52:31,292 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 22:52:31,293 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2020-08-18 22:52:31,293 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1174032019] [2020-08-18 22:52:31,294 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 22:52:31,294 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:52:31,294 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 22:52:31,294 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=130, Unknown=0, NotChecked=0, Total=156 [2020-08-18 22:52:31,295 INFO L87 Difference]: Start difference. First operand 95 states and 121 transitions. Second operand 13 states. [2020-08-18 22:52:32,080 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:52:32,081 INFO L93 Difference]: Finished difference Result 152 states and 194 transitions. [2020-08-18 22:52:32,082 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-18 22:52:32,082 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 79 [2020-08-18 22:52:32,083 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:52:32,086 INFO L225 Difference]: With dead ends: 152 [2020-08-18 22:52:32,086 INFO L226 Difference]: Without dead ends: 99 [2020-08-18 22:52:32,088 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 [2020-08-18 22:52:32,088 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2020-08-18 22:52:32,100 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 97. [2020-08-18 22:52:32,100 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2020-08-18 22:52:32,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 125 transitions. [2020-08-18 22:52:32,102 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 125 transitions. Word has length 79 [2020-08-18 22:52:32,102 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:52:32,102 INFO L479 AbstractCegarLoop]: Abstraction has 97 states and 125 transitions. [2020-08-18 22:52:32,103 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 22:52:32,103 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 125 transitions. [2020-08-18 22:52:32,107 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2020-08-18 22:52:32,108 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:52:32,108 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] [2020-08-18 22:52:32,108 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 22:52:32,108 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:52:32,108 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:52:32,109 INFO L82 PathProgramCache]: Analyzing trace with hash -708508396, now seen corresponding path program 1 times [2020-08-18 22:52:32,109 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:52:32,109 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1198843085] [2020-08-18 22:52:32,109 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:52:32,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-18 22:52:32,147 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-18 22:52:32,147 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-18 22:52:32,151 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 22:52:32,173 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 18.08 10:52:32 BoogieIcfgContainer [2020-08-18 22:52:32,173 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-18 22:52:32,176 INFO L168 Benchmark]: Toolchain (without parser) took 6122.33 ms. Allocated memory was 141.6 MB in the beginning and 283.1 MB in the end (delta: 141.6 MB). Free memory was 104.2 MB in the beginning and 193.5 MB in the end (delta: -89.3 MB). Peak memory consumption was 52.2 MB. Max. memory is 7.1 GB. [2020-08-18 22:52:32,177 INFO L168 Benchmark]: CDTParser took 0.14 ms. Allocated memory is still 141.6 MB. Free memory was 123.1 MB in the beginning and 122.9 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. [2020-08-18 22:52:32,178 INFO L168 Benchmark]: CACSL2BoogieTranslator took 478.20 ms. Allocated memory was 141.6 MB in the beginning and 203.9 MB in the end (delta: 62.4 MB). Free memory was 104.0 MB in the beginning and 180.1 MB in the end (delta: -76.1 MB). Peak memory consumption was 21.7 MB. Max. memory is 7.1 GB. [2020-08-18 22:52:32,179 INFO L168 Benchmark]: Boogie Preprocessor took 86.52 ms. Allocated memory is still 203.9 MB. Free memory was 180.1 MB in the beginning and 177.5 MB in the end (delta: 2.6 MB). Peak memory consumption was 2.6 MB. Max. memory is 7.1 GB. [2020-08-18 22:52:32,180 INFO L168 Benchmark]: RCFGBuilder took 604.71 ms. Allocated memory is still 203.9 MB. Free memory was 177.5 MB in the beginning and 141.3 MB in the end (delta: 36.2 MB). Peak memory consumption was 36.2 MB. Max. memory is 7.1 GB. [2020-08-18 22:52:32,181 INFO L168 Benchmark]: TraceAbstraction took 4948.27 ms. Allocated memory was 203.9 MB in the beginning and 283.1 MB in the end (delta: 79.2 MB). Free memory was 141.3 MB in the beginning and 193.5 MB in the end (delta: -52.2 MB). Peak memory consumption was 26.9 MB. Max. memory is 7.1 GB. [2020-08-18 22:52:32,184 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.14 ms. Allocated memory is still 141.6 MB. Free memory was 123.1 MB in the beginning and 122.9 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 478.20 ms. Allocated memory was 141.6 MB in the beginning and 203.9 MB in the end (delta: 62.4 MB). Free memory was 104.0 MB in the beginning and 180.1 MB in the end (delta: -76.1 MB). Peak memory consumption was 21.7 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 86.52 ms. Allocated memory is still 203.9 MB. Free memory was 180.1 MB in the beginning and 177.5 MB in the end (delta: 2.6 MB). Peak memory consumption was 2.6 MB. Max. memory is 7.1 GB. * RCFGBuilder took 604.71 ms. Allocated memory is still 203.9 MB. Free memory was 177.5 MB in the beginning and 141.3 MB in the end (delta: 36.2 MB). Peak memory consumption was 36.2 MB. Max. memory is 7.1 GB. * TraceAbstraction took 4948.27 ms. Allocated memory was 203.9 MB in the beginning and 283.1 MB in the end (delta: 79.2 MB). Free memory was 141.3 MB in the beginning and 193.5 MB in the end (delta: -52.2 MB). Peak memory consumption was 26.9 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: [L108] 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; [L108] RET, EXPR nondet_tree() [L108] CALL task(nondet_tree()) [L84] 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; [L84] RET, EXPR min(t) [L84] int a = min(t); [L85] int b; [L87] CALL, EXPR size(t) [L79] COND FALSE !(!t) [L80] EXPR t->left [L80] CALL, EXPR size(t->left) [L79] COND TRUE !t [L79] return 0; [L80] RET, EXPR size(t->left) [L80] EXPR t->right [L80] CALL, EXPR size(t->right) [L79] COND TRUE !t [L79] return 0; [L80] RET, EXPR size(t->right) [L80] return size(t->left) + size(t->right) + 1; [L87] RET, EXPR size(t) [L87] int n = size(t); [L88] CALL assume_cycle_if_not(n != 0) [L9] COND FALSE !(!cond) [L88] RET assume_cycle_if_not(n != 0) [L89] EXPR, FCALL calloc(n, sizeof(int)) [L89] int *x = calloc(n, sizeof(int)); [L90] CALL tree_inorder(t, x, n) [L68] COND FALSE !(!t) [L71] EXPR t->left [L71] CALL, EXPR tree_inorder(t->left, a, i) [L68] COND TRUE !t [L69] return i; [L71] RET, EXPR tree_inorder(t->left, a, i) [L71] i = tree_inorder(t->left, a, i) [L72] EXPR i++ [L72] EXPR t->data [L72] a[i++] = t->data [L73] EXPR t->right [L73] CALL, EXPR tree_inorder(t->right, a, i) [L68] COND TRUE !t [L69] return i; [L73] RET, EXPR tree_inorder(t->right, a, i) [L73] i = tree_inorder(t->right, a, i) [L74] return i; [L90] RET tree_inorder(t, x, n) [L91] EXPR x[0] [L91] CALL __VERIFIER_assert(a == x[0]) [L14] COND TRUE !cond [L14] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 12 procedures, 98 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 4.8s, OverallIterations: 5, TraceHistogramMax: 3, AutomataDifference: 3.2s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 344 SDtfs, 519 SDslu, 1387 SDs, 0 SdLazy, 1962 SolverSat, 490 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, 1.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=98occurred 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, 17 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 0.9s InterpolantComputationTime, 336 NumberOfCodeBlocks, 336 NumberOfCodeBlocksAsserted, 5 NumberOfCheckSat, 241 ConstructedInterpolants, 0 QuantifiedInterpolants, 45761 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...