/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks NOT_INCREMENTALLY -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-d623d84 [2020-07-21 11:11:44,919 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 11:11:44,922 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 11:11:44,943 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 11:11:44,944 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 11:11:44,946 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 11:11:44,949 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 11:11:44,962 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 11:11:44,967 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 11:11:44,969 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 11:11:44,972 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 11:11:44,974 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 11:11:44,975 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 11:11:44,977 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 11:11:44,979 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 11:11:44,980 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 11:11:44,982 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 11:11:44,984 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 11:11:44,986 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 11:11:44,993 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 11:11:44,998 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 11:11:45,002 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 11:11:45,004 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 11:11:45,004 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 11:11:45,008 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-07-21 11:11:45,008 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-07-21 11:11:45,009 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-07-21 11:11:45,012 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-07-21 11:11:45,013 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-07-21 11:11:45,014 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-07-21 11:11:45,014 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-07-21 11:11:45,016 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-07-21 11:11:45,017 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-07-21 11:11:45,017 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-07-21 11:11:45,018 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-07-21 11:11:45,019 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-07-21 11:11:45,020 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-07-21 11:11:45,020 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-07-21 11:11:45,020 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 11:11:45,021 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 11:11:45,023 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 11:11:45,023 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 11:11:45,063 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 11:11:45,064 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 11:11:45,068 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 11:11:45,069 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 11:11:45,069 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 11:11:45,069 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 11:11:45,069 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 11:11:45,070 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 11:11:45,070 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 11:11:45,070 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 11:11:45,070 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 11:11:45,072 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 11:11:45,073 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 11:11:45,073 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 11:11:45,073 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 11:11:45,073 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 11:11:45,073 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 11:11:45,074 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 11:11:45,074 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 11:11:45,074 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 11:11:45,074 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 11:11:45,074 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 11:11:45,075 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 11:11:45,075 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 11:11:45,077 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 11:11:45,077 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 11:11:45,078 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:11:45,078 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 11:11:45,078 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 11:11:45,079 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 -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> NOT_INCREMENTALLY [2020-07-21 11:11:45,409 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 11:11:45,432 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 11:11:45,436 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 11:11:45,438 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 11:11:45,440 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 11:11:45,442 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/verifythis/tree_del_rec.c [2020-07-21 11:11:45,531 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d8e09f18a/a53ee1bfd547483d8b2fcaa1668476b1/FLAGa7ce95735 [2020-07-21 11:11:46,025 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 11:11:46,026 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/verifythis/tree_del_rec.c [2020-07-21 11:11:46,037 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d8e09f18a/a53ee1bfd547483d8b2fcaa1668476b1/FLAGa7ce95735 [2020-07-21 11:11:46,377 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d8e09f18a/a53ee1bfd547483d8b2fcaa1668476b1 [2020-07-21 11:11:46,387 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 11:11:46,390 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 11:11:46,391 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 11:11:46,391 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 11:11:46,395 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 11:11:46,397 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 11:11:46" (1/1) ... [2020-07-21 11:11:46,400 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@f65fbdf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:11:46, skipping insertion in model container [2020-07-21 11:11:46,400 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 11:11:46" (1/1) ... [2020-07-21 11:11:46,409 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 11:11:46,440 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 11:11:46,726 WARN L1484 CHandler]: Possible shadowing of function min [2020-07-21 11:11:46,729 WARN L1484 CHandler]: Possible shadowing of function min [2020-07-21 11:11:46,776 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 11:11:46,799 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 11:11:46,914 WARN L1484 CHandler]: Possible shadowing of function min [2020-07-21 11:11:46,915 WARN L1484 CHandler]: Possible shadowing of function min [2020-07-21 11:11:46,926 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 11:11:46,950 INFO L208 MainTranslator]: Completed translation [2020-07-21 11:11:46,951 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:11:46 WrapperNode [2020-07-21 11:11:46,951 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 11:11:46,952 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 11:11:46,952 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 11:11:46,953 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 11:11:46,972 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:11:46" (1/1) ... [2020-07-21 11:11:46,972 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:11:46" (1/1) ... [2020-07-21 11:11:46,984 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:11:46" (1/1) ... [2020-07-21 11:11:46,984 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:11:46" (1/1) ... [2020-07-21 11:11:47,001 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:11:46" (1/1) ... [2020-07-21 11:11:47,008 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:11:46" (1/1) ... [2020-07-21 11:11:47,011 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:11:46" (1/1) ... [2020-07-21 11:11:47,015 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 11:11:47,016 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 11:11:47,016 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 11:11:47,016 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 11:11:47,017 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:11:46" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 11:11:47,081 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 11:11:47,082 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 11:11:47,082 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_cycle_if_not [2020-07-21 11:11:47,082 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-21 11:11:47,082 INFO L138 BoogieDeclarations]: Found implementation of procedure nondet_tree [2020-07-21 11:11:47,082 INFO L138 BoogieDeclarations]: Found implementation of procedure min [2020-07-21 11:11:47,083 INFO L138 BoogieDeclarations]: Found implementation of procedure tree_del [2020-07-21 11:11:47,083 INFO L138 BoogieDeclarations]: Found implementation of procedure tree_inorder [2020-07-21 11:11:47,083 INFO L138 BoogieDeclarations]: Found implementation of procedure size [2020-07-21 11:11:47,083 INFO L138 BoogieDeclarations]: Found implementation of procedure task [2020-07-21 11:11:47,083 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 11:11:47,084 INFO L138 BoogieDeclarations]: Found implementation of procedure #Ultimate.meminit [2020-07-21 11:11:47,084 INFO L130 BoogieDeclarations]: Found specification of procedure calloc [2020-07-21 11:11:47,084 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-07-21 11:11:47,084 INFO L130 BoogieDeclarations]: Found specification of procedure free [2020-07-21 11:11:47,084 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 11:11:47,084 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2020-07-21 11:11:47,084 INFO L130 BoogieDeclarations]: Found specification of procedure assume_cycle_if_not [2020-07-21 11:11:47,085 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 11:11:47,085 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 11:11:47,085 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_tree [2020-07-21 11:11:47,085 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-07-21 11:11:47,085 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-07-21 11:11:47,085 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-07-21 11:11:47,086 INFO L130 BoogieDeclarations]: Found specification of procedure min [2020-07-21 11:11:47,086 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-07-21 11:11:47,086 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-07-21 11:11:47,086 INFO L130 BoogieDeclarations]: Found specification of procedure tree_del [2020-07-21 11:11:47,086 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-07-21 11:11:47,086 INFO L130 BoogieDeclarations]: Found specification of procedure tree_inorder [2020-07-21 11:11:47,087 INFO L130 BoogieDeclarations]: Found specification of procedure size [2020-07-21 11:11:47,087 INFO L130 BoogieDeclarations]: Found specification of procedure task [2020-07-21 11:11:47,087 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-07-21 11:11:47,087 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.meminit [2020-07-21 11:11:47,087 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 11:11:47,088 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 11:11:47,088 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 11:11:47,637 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 11:11:47,638 INFO L295 CfgBuilder]: Removed 2 assume(true) statements. [2020-07-21 11:11:47,643 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 11:11:47 BoogieIcfgContainer [2020-07-21 11:11:47,644 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 11:11:47,645 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 11:11:47,645 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 11:11:47,649 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 11:11:47,650 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 11:11:46" (1/3) ... [2020-07-21 11:11:47,650 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@302e43a9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 11:11:47, skipping insertion in model container [2020-07-21 11:11:47,651 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:11:46" (2/3) ... [2020-07-21 11:11:47,651 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@302e43a9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 11:11:47, skipping insertion in model container [2020-07-21 11:11:47,652 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 11:11:47" (3/3) ... [2020-07-21 11:11:47,654 INFO L109 eAbstractionObserver]: Analyzing ICFG tree_del_rec.c [2020-07-21 11:11:47,664 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 11:11:47,673 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 11:11:47,688 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 11:11:47,714 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 11:11:47,714 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 11:11:47,714 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 11:11:47,715 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 11:11:47,715 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 11:11:47,715 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 11:11:47,716 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 11:11:47,716 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 11:11:47,739 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states. [2020-07-21 11:11:47,749 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-07-21 11:11:47,749 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:11:47,751 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] [2020-07-21 11:11:47,751 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:11:47,757 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:11:47,758 INFO L82 PathProgramCache]: Analyzing trace with hash -1057238675, now seen corresponding path program 1 times [2020-07-21 11:11:47,766 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:11:47,766 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [47048142] [2020-07-21 11:11:47,767 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:11:47,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:11:47,974 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 11:11:47,989 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:11:48,082 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:11:48,083 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 11:11:48,084 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [47048142] [2020-07-21 11:11:48,085 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 11:11:48,086 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-07-21 11:11:48,087 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1674782619] [2020-07-21 11:11:48,093 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-07-21 11:11:48,093 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:11:48,107 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-07-21 11:11:48,108 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-07-21 11:11:48,111 INFO L87 Difference]: Start difference. First operand 97 states. Second operand 7 states. [2020-07-21 11:11:48,238 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:11:48,239 INFO L93 Difference]: Finished difference Result 165 states and 216 transitions. [2020-07-21 11:11:48,240 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 11:11:48,242 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 44 [2020-07-21 11:11:48,242 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:11:48,255 INFO L225 Difference]: With dead ends: 165 [2020-07-21 11:11:48,256 INFO L226 Difference]: Without dead ends: 90 [2020-07-21 11:11:48,261 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2020-07-21 11:11:48,282 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-07-21 11:11:48,330 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 90. [2020-07-21 11:11:48,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2020-07-21 11:11:48,336 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 114 transitions. [2020-07-21 11:11:48,339 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 114 transitions. Word has length 44 [2020-07-21 11:11:48,339 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:11:48,339 INFO L479 AbstractCegarLoop]: Abstraction has 90 states and 114 transitions. [2020-07-21 11:11:48,340 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-07-21 11:11:48,340 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 114 transitions. [2020-07-21 11:11:48,344 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-07-21 11:11:48,344 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:11:48,345 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] [2020-07-21 11:11:48,548 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:11:48,549 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:11:48,550 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:11:48,550 INFO L82 PathProgramCache]: Analyzing trace with hash 1861604494, now seen corresponding path program 1 times [2020-07-21 11:11:48,551 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:11:48,552 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [633244598] [2020-07-21 11:11:48,552 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:11:48,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:11:48,675 INFO L263 TraceCheckSpWp]: Trace formula consists of 256 conjuncts, 25 conjunts are in the unsatisfiable core [2020-07-21 11:11:48,680 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:11:48,780 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-21 11:11:48,780 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:11:48,951 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-21 11:11:48,952 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [633244598] [2020-07-21 11:11:48,952 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:11:48,952 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2020-07-21 11:11:48,953 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2036763716] [2020-07-21 11:11:48,955 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 11:11:48,955 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:11:48,956 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 11:11:48,956 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2020-07-21 11:11:48,956 INFO L87 Difference]: Start difference. First operand 90 states and 114 transitions. Second operand 9 states. [2020-07-21 11:11:49,118 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:11:49,118 INFO L93 Difference]: Finished difference Result 159 states and 202 transitions. [2020-07-21 11:11:49,119 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 11:11:49,119 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 56 [2020-07-21 11:11:49,120 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:11:49,123 INFO L225 Difference]: With dead ends: 159 [2020-07-21 11:11:49,123 INFO L226 Difference]: Without dead ends: 92 [2020-07-21 11:11:49,125 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 104 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2020-07-21 11:11:49,126 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2020-07-21 11:11:49,140 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 92. [2020-07-21 11:11:49,140 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2020-07-21 11:11:49,144 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 117 transitions. [2020-07-21 11:11:49,144 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 117 transitions. Word has length 56 [2020-07-21 11:11:49,145 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:11:49,145 INFO L479 AbstractCegarLoop]: Abstraction has 92 states and 117 transitions. [2020-07-21 11:11:49,145 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 11:11:49,145 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 117 transitions. [2020-07-21 11:11:49,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-07-21 11:11:49,152 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:11:49,154 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] [2020-07-21 11:11:49,367 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:11:49,368 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:11:49,369 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:11:49,369 INFO L82 PathProgramCache]: Analyzing trace with hash 1883823467, now seen corresponding path program 1 times [2020-07-21 11:11:49,370 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:11:49,370 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1520381282] [2020-07-21 11:11:49,371 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:11:49,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:11:49,478 INFO L263 TraceCheckSpWp]: Trace formula consists of 322 conjuncts, 27 conjunts are in the unsatisfiable core [2020-07-21 11:11:49,483 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:11:49,688 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-07-21 11:11:49,688 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:11:49,975 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-07-21 11:11:49,976 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1520381282] [2020-07-21 11:11:49,976 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:11:49,976 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 14 [2020-07-21 11:11:49,977 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [493475738] [2020-07-21 11:11:49,979 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 11:11:49,980 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:11:49,980 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 11:11:49,981 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=152, Unknown=0, NotChecked=0, Total=182 [2020-07-21 11:11:49,981 INFO L87 Difference]: Start difference. First operand 92 states and 117 transitions. Second operand 14 states. [2020-07-21 11:11:50,401 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:11:50,402 INFO L93 Difference]: Finished difference Result 158 states and 201 transitions. [2020-07-21 11:11:50,402 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 11:11:50,403 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 66 [2020-07-21 11:11:50,403 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:11:50,406 INFO L225 Difference]: With dead ends: 158 [2020-07-21 11:11:50,406 INFO L226 Difference]: Without dead ends: 94 [2020-07-21 11:11:50,408 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 120 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=54, Invalid=288, Unknown=0, NotChecked=0, Total=342 [2020-07-21 11:11:50,409 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-07-21 11:11:50,423 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 94. [2020-07-21 11:11:50,424 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2020-07-21 11:11:50,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 120 transitions. [2020-07-21 11:11:50,427 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 120 transitions. Word has length 66 [2020-07-21 11:11:50,427 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:11:50,427 INFO L479 AbstractCegarLoop]: Abstraction has 94 states and 120 transitions. [2020-07-21 11:11:50,427 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 11:11:50,428 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 120 transitions. [2020-07-21 11:11:50,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2020-07-21 11:11:50,430 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:11:50,431 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] [2020-07-21 11:11:50,645 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:11:50,647 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:11:50,648 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:11:50,648 INFO L82 PathProgramCache]: Analyzing trace with hash 1030140767, now seen corresponding path program 1 times [2020-07-21 11:11:50,649 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:11:50,650 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1155131581] [2020-07-21 11:11:50,650 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:11:50,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:11:50,784 INFO L263 TraceCheckSpWp]: Trace formula consists of 377 conjuncts, 39 conjunts are in the unsatisfiable core [2020-07-21 11:11:50,802 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:11:50,943 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2020-07-21 11:11:50,944 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:11:51,143 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:11:51,287 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2020-07-21 11:11:51,288 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1155131581] [2020-07-21 11:11:51,288 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:11:51,289 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 18 [2020-07-21 11:11:51,289 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [366764258] [2020-07-21 11:11:51,290 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 11:11:51,290 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:11:51,290 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 11:11:51,291 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=264, Unknown=0, NotChecked=0, Total=306 [2020-07-21 11:11:51,291 INFO L87 Difference]: Start difference. First operand 94 states and 120 transitions. Second operand 18 states. [2020-07-21 11:11:51,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:11:51,735 INFO L93 Difference]: Finished difference Result 150 states and 193 transitions. [2020-07-21 11:11:51,737 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 11:11:51,738 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 79 [2020-07-21 11:11:51,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:11:51,742 INFO L225 Difference]: With dead ends: 150 [2020-07-21 11:11:51,742 INFO L226 Difference]: Without dead ends: 98 [2020-07-21 11:11:51,743 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 142 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=71, Invalid=435, Unknown=0, NotChecked=0, Total=506 [2020-07-21 11:11:51,748 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-07-21 11:11:51,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 98. [2020-07-21 11:11:51,763 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 98 states. [2020-07-21 11:11:51,764 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 124 transitions. [2020-07-21 11:11:51,765 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 124 transitions. Word has length 79 [2020-07-21 11:11:51,765 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:11:51,765 INFO L479 AbstractCegarLoop]: Abstraction has 98 states and 124 transitions. [2020-07-21 11:11:51,766 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 11:11:51,766 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 124 transitions. [2020-07-21 11:11:51,768 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2020-07-21 11:11:51,768 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:11:51,768 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] [2020-07-21 11:11:51,981 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:11:51,982 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:11:51,983 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:11:51,983 INFO L82 PathProgramCache]: Analyzing trace with hash -299285422, now seen corresponding path program 1 times [2020-07-21 11:11:51,983 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:11:51,984 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [759039676] [2020-07-21 11:11:51,984 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:11:52,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-21 11:11:52,144 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 11:11:52,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-21 11:11:52,206 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 11:11:52,269 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-21 11:11:52,270 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-21 11:11:52,483 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:11:52,552 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 11:11:52 BoogieIcfgContainer [2020-07-21 11:11:52,552 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 11:11:52,555 INFO L168 Benchmark]: Toolchain (without parser) took 6165.16 ms. Allocated memory was 140.0 MB in the beginning and 280.5 MB in the end (delta: 140.5 MB). Free memory was 103.5 MB in the beginning and 191.9 MB in the end (delta: -88.4 MB). Peak memory consumption was 52.2 MB. Max. memory is 7.1 GB. [2020-07-21 11:11:52,556 INFO L168 Benchmark]: CDTParser took 0.23 ms. Allocated memory is still 140.0 MB. Free memory was 123.1 MB in the beginning and 122.9 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. [2020-07-21 11:11:52,557 INFO L168 Benchmark]: CACSL2BoogieTranslator took 560.63 ms. Allocated memory was 140.0 MB in the beginning and 203.9 MB in the end (delta: 64.0 MB). Free memory was 103.1 MB in the beginning and 180.2 MB in the end (delta: -77.1 MB). Peak memory consumption was 23.2 MB. Max. memory is 7.1 GB. [2020-07-21 11:11:52,558 INFO L168 Benchmark]: Boogie Preprocessor took 63.42 ms. Allocated memory is still 203.9 MB. Free memory was 180.2 MB in the beginning and 177.6 MB in the end (delta: 2.6 MB). Peak memory consumption was 2.6 MB. Max. memory is 7.1 GB. [2020-07-21 11:11:52,559 INFO L168 Benchmark]: RCFGBuilder took 627.78 ms. Allocated memory is still 203.9 MB. Free memory was 177.6 MB in the beginning and 143.6 MB in the end (delta: 34.0 MB). Peak memory consumption was 34.0 MB. Max. memory is 7.1 GB. [2020-07-21 11:11:52,560 INFO L168 Benchmark]: TraceAbstraction took 4907.05 ms. Allocated memory was 203.9 MB in the beginning and 280.5 MB in the end (delta: 76.5 MB). Free memory was 143.0 MB in the beginning and 191.9 MB in the end (delta: -48.9 MB). Peak memory consumption was 27.7 MB. Max. memory is 7.1 GB. [2020-07-21 11:11:52,564 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 140.0 MB. Free memory was 123.1 MB in the beginning and 122.9 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 560.63 ms. Allocated memory was 140.0 MB in the beginning and 203.9 MB in the end (delta: 64.0 MB). Free memory was 103.1 MB in the beginning and 180.2 MB in the end (delta: -77.1 MB). Peak memory consumption was 23.2 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 63.42 ms. Allocated memory is still 203.9 MB. Free memory was 180.2 MB in the beginning and 177.6 MB in the end (delta: 2.6 MB). Peak memory consumption was 2.6 MB. Max. memory is 7.1 GB. * RCFGBuilder took 627.78 ms. Allocated memory is still 203.9 MB. Free memory was 177.6 MB in the beginning and 143.6 MB in the end (delta: 34.0 MB). Peak memory consumption was 34.0 MB. Max. memory is 7.1 GB. * TraceAbstraction took 4907.05 ms. Allocated memory was 203.9 MB in the beginning and 280.5 MB in the end (delta: 76.5 MB). Free memory was 143.0 MB in the beginning and 191.9 MB in the end (delta: -48.9 MB). Peak memory consumption was 27.7 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; VAL [\result={0:0}] [L28] RET, EXPR nondet_tree() VAL [malloc(sizeof(struct node))={-1:0}, n={-1:0}, nondet_tree()={0:0}] [L28] n->left = nondet_tree() [L29] CALL, EXPR nondet_tree() [L23] COND TRUE __VERIFIER_nondet_bool() [L24] return 0; VAL [\result={0:0}] [L29] RET, EXPR nondet_tree() VAL [malloc(sizeof(struct node))={-1:0}, n={-1:0}, nondet_tree()={0:0}] [L29] n->right = nondet_tree() [L30] return n; VAL [\result={-1:0}, malloc(sizeof(struct node))={-1:0}, n={-1:0}] [L100] RET, EXPR nondet_tree() VAL [nondet_tree()={-1:0}] [L100] CALL task(nondet_tree()) VAL [t={-1:0}] [L76] CALL, EXPR min(t) VAL [n={-1:0}] [L35] COND FALSE !(!n) [L38] EXPR n->data [L38] int a = n->data; [L39] EXPR n->left VAL [a=2147483647, n={-1:0}, n={-1:0}, n->left={0:0}] [L39] CALL, EXPR min(n->left) VAL [n={0:0}] [L35] COND TRUE !n [L36] return 2147483647; VAL [\result=2147483647, n={0:0}, n={0:0}] [L39] RET, EXPR min(n->left) VAL [a=2147483647, min(n->left)=2147483647, n={-1:0}, n={-1:0}, n->left={0:0}] [L39] int b = min(n->left); [L40] EXPR n->right VAL [a=2147483647, b=2147483647, n={-1:0}, n={-1:0}, n->right={0:0}] [L40] CALL, EXPR min(n->right) VAL [n={0:0}] [L35] COND TRUE !n [L36] return 2147483647; VAL [\result=2147483647, n={0:0}, n={0:0}] [L40] RET, EXPR min(n->right) VAL [a=2147483647, b=2147483647, min(n->right)=2147483647, n={-1:0}, n={-1:0}, n->right={0:0}] [L40] int c = min(n->right); [L41] COND TRUE b <= a && b <= c [L41] return b; VAL [\result=2147483647, a=2147483647, b=2147483647, c=2147483647, n={-1:0}, n={-1:0}] [L76] RET, EXPR min(t) VAL [min(t)=2147483647, t={-1:0}, t={-1:0}] [L76] int a = min(t); [L77] int b; VAL [a=2147483647, b={16910:0}, t={-1:0}, t={-1:0}] [L79] CALL, EXPR size(t) VAL [t={-1:0}] [L71] COND FALSE !(!t) [L72] EXPR t->left VAL [t={-1:0}, t={-1:0}, t->left={0:0}] [L72] CALL, EXPR size(t->left) VAL [t={0:0}] [L71] COND TRUE !t [L71] return 0; VAL [\result=0, t={0:0}, t={0:0}] [L72] RET, EXPR size(t->left) VAL [size(t->left)=0, t={-1:0}, t={-1:0}, t->left={0:0}] [L72] EXPR t->right VAL [size(t->left)=0, t={-1:0}, t={-1:0}, t->left={0:0}, t->right={0:0}] [L72] CALL, EXPR size(t->right) VAL [t={0:0}] [L71] COND TRUE !t [L71] return 0; VAL [\result=0, t={0:0}, t={0:0}] [L72] RET, EXPR size(t->right) VAL [size(t->left)=0, size(t->right)=0, t={-1:0}, t={-1:0}, t->left={0:0}, t->right={0:0}] [L72] return size(t->left) + size(t->right) + 1; [L79] RET, EXPR size(t) VAL [a=2147483647, b={16910:0}, size(t)=1, t={-1:0}, t={-1:0}] [L79] int n = size(t); [L80] CALL assume_cycle_if_not(n != 0) VAL [\old(cond)=1] [L9] COND FALSE !(!cond) VAL [\old(cond)=1, cond=1] [L80] RET assume_cycle_if_not(n != 0) VAL [a=2147483647, b={16910:0}, n=1, t={-1:0}, t={-1:0}] [L81] EXPR, FCALL calloc(n, sizeof(int)) VAL [a=2147483647, b={16910:0}, calloc(n, sizeof(int))={16908:0}, n=1, t={-1:0}, t={-1:0}] [L81] int *x = calloc(n, sizeof(int)); VAL [a=2147483647, b={16910:0}, calloc(n, sizeof(int))={16908:0}, n=1, t={-1:0}, t={-1:0}, x={16908:0}] [L82] CALL tree_inorder(t, x, n) VAL [\old(i)=1, a={16908:0}, t={-1:0}] [L60] COND FALSE !(!t) [L63] EXPR t->left VAL [\old(i)=1, a={16908:0}, a={16908:0}, i=1, t={-1:0}, t={-1:0}, t->left={0:0}] [L63] CALL, EXPR tree_inorder(t->left, a, i) VAL [\old(i)=1, a={16908:0}, t={0:0}] [L60] COND TRUE !t [L61] return i; VAL [\old(i)=1, \result=1, a={16908:0}, a={16908:0}, i=1, t={0:0}, t={0:0}] [L63] RET, EXPR tree_inorder(t->left, a, i) VAL [\old(i)=1, a={16908:0}, a={16908:0}, i=1, t={-1:0}, t={-1:0}, t->left={0:0}, tree_inorder(t->left, a, i)=1] [L63] i = tree_inorder(t->left, a, i) [L64] EXPR i++ [L64] EXPR t->data [L64] a[i++] = t->data [L65] EXPR t->right VAL [\old(i)=1, a={16908:0}, a={16908:0}, i=2, t={-1:0}, t={-1:0}, t->right={0:0}] [L65] CALL, EXPR tree_inorder(t->right, a, i) VAL [\old(i)=2, a={16908:0}, t={0:0}] [L60] COND TRUE !t [L61] return i; VAL [\old(i)=2, \result=2, a={16908:0}, a={16908:0}, i=2, t={0:0}, t={0:0}] [L65] RET, EXPR tree_inorder(t->right, a, i) VAL [\old(i)=1, a={16908:0}, a={16908:0}, i=2, t={-1:0}, t={-1:0}, t->right={0:0}, tree_inorder(t->right, a, i)=2] [L65] i = tree_inorder(t->right, a, i) [L66] return i; VAL [\old(i)=1, \result=2, a={16908:0}, a={16908:0}, i=2, t={-1:0}, t={-1:0}] [L82] RET tree_inorder(t, x, n) VAL [a=2147483647, b={16910:0}, calloc(n, sizeof(int))={16908:0}, n=1, t={-1:0}, t={-1:0}, tree_inorder(t, x, n)=2, x={16908:0}] [L83] EXPR x[0] VAL [a=2147483647, b={16910:0}, calloc(n, sizeof(int))={16908:0}, n=1, t={-1:0}, t={-1:0}, x={16908:0}, x[0]=0] [L83] CALL __VERIFIER_assert(a == x[0]) VAL [\old(cond)=0] [L14] COND TRUE !cond VAL [\old(cond)=0, cond=0] [L14] __VERIFIER_error() VAL [\old(cond)=0, cond=0] - StatisticsResult: Ultimate Automizer benchmark data CFG has 12 procedures, 97 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 4.7s, OverallIterations: 5, TraceHistogramMax: 3, AutomataDifference: 1.2s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 415 SDtfs, 130 SDslu, 3381 SDs, 0 SdLazy, 700 SolverSat, 86 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.6s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 460 GetRequests, 404 SyntacticMatches, 3 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 0.7s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=98occurred in iteration=4, 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, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.3s SatisfiabilityAnalysisTime, 1.3s InterpolantComputationTime, 336 NumberOfCodeBlocks, 336 NumberOfCodeBlocksAsserted, 5 NumberOfCheckSat, 439 ConstructedInterpolants, 0 QuantifiedInterpolants, 72292 SizeOfPredicates, 28 NumberOfNonLiveVariables, 1164 ConjunctsInSsa, 102 ConjunctsInUnsatCore, 7 InterpolantComputations, 1 PerfectInterpolantSequences, 120/132 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...