/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 SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -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 16:14:33,179 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 16:14:33,181 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 16:14:33,193 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 16:14:33,193 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 16:14:33,194 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 16:14:33,195 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 16:14:33,197 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 16:14:33,199 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 16:14:33,200 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 16:14:33,201 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 16:14:33,202 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 16:14:33,202 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 16:14:33,203 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 16:14:33,204 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 16:14:33,205 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 16:14:33,206 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 16:14:33,207 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 16:14:33,208 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 16:14:33,210 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 16:14:33,211 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 16:14:33,212 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 16:14:33,213 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 16:14:33,214 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 16:14:33,217 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-07-21 16:14:33,217 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-07-21 16:14:33,217 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-07-21 16:14:33,218 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-07-21 16:14:33,218 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-07-21 16:14:33,219 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-07-21 16:14:33,220 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-07-21 16:14:33,220 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-07-21 16:14:33,221 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-07-21 16:14:33,222 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-07-21 16:14:33,223 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-07-21 16:14:33,223 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-07-21 16:14:33,224 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-07-21 16:14:33,224 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-07-21 16:14:33,224 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 16:14:33,225 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 16:14:33,226 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 16:14:33,226 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 16:14:33,240 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 16:14:33,241 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 16:14:33,242 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 16:14:33,242 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 16:14:33,242 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 16:14:33,242 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 16:14:33,243 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 16:14:33,243 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 16:14:33,243 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 16:14:33,243 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 16:14:33,243 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 16:14:33,244 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 16:14:33,244 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 16:14:33,244 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 16:14:33,244 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 16:14:33,244 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 16:14:33,245 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 16:14:33,245 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 16:14:33,245 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 16:14:33,245 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 16:14:33,245 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 16:14:33,246 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 16:14:33,246 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 16:14:33,246 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 16:14:33,246 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 16:14:33,247 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 16:14:33,247 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:14:33,247 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 16:14:33,247 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 16:14:33,247 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 -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_VARIABLES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 2 [2020-07-21 16:14:33,562 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 16:14:33,575 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 16:14:33,579 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 16:14:33,580 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 16:14:33,580 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 16:14:33,581 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/verifythis/tree_del_rec.c [2020-07-21 16:14:33,640 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/115ef36b8/365d489f44ce4fde9cf5fe8feb564f65/FLAGddab003e1 [2020-07-21 16:14:34,102 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 16:14:34,103 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/verifythis/tree_del_rec.c [2020-07-21 16:14:34,113 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/115ef36b8/365d489f44ce4fde9cf5fe8feb564f65/FLAGddab003e1 [2020-07-21 16:14:34,411 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/115ef36b8/365d489f44ce4fde9cf5fe8feb564f65 [2020-07-21 16:14:34,420 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 16:14:34,423 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 16:14:34,424 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 16:14:34,424 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 16:14:34,427 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 16:14:34,428 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 04:14:34" (1/1) ... [2020-07-21 16:14:34,431 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3c2516d8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:14:34, skipping insertion in model container [2020-07-21 16:14:34,431 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 04:14:34" (1/1) ... [2020-07-21 16:14:34,439 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 16:14:34,466 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 16:14:34,671 WARN L1484 CHandler]: Possible shadowing of function min [2020-07-21 16:14:34,673 WARN L1484 CHandler]: Possible shadowing of function min [2020-07-21 16:14:34,688 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 16:14:34,702 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 16:14:34,819 WARN L1484 CHandler]: Possible shadowing of function min [2020-07-21 16:14:34,825 WARN L1484 CHandler]: Possible shadowing of function min [2020-07-21 16:14:34,841 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 16:14:34,864 INFO L208 MainTranslator]: Completed translation [2020-07-21 16:14:34,865 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:14:34 WrapperNode [2020-07-21 16:14:34,865 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 16:14:34,866 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 16:14:34,866 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 16:14:34,866 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 16:14:34,875 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:14:34" (1/1) ... [2020-07-21 16:14:34,876 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:14:34" (1/1) ... [2020-07-21 16:14:34,886 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:14:34" (1/1) ... [2020-07-21 16:14:34,887 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:14:34" (1/1) ... [2020-07-21 16:14:34,903 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:14:34" (1/1) ... [2020-07-21 16:14:34,909 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:14:34" (1/1) ... [2020-07-21 16:14:34,912 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:14:34" (1/1) ... [2020-07-21 16:14:34,916 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 16:14:34,917 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 16:14:34,917 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 16:14:34,917 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 16:14:34,918 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:14:34" (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 16:14:34,984 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 16:14:34,984 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 16:14:34,984 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_cycle_if_not [2020-07-21 16:14:34,985 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-21 16:14:34,985 INFO L138 BoogieDeclarations]: Found implementation of procedure nondet_tree [2020-07-21 16:14:34,985 INFO L138 BoogieDeclarations]: Found implementation of procedure min [2020-07-21 16:14:34,985 INFO L138 BoogieDeclarations]: Found implementation of procedure tree_del [2020-07-21 16:14:34,985 INFO L138 BoogieDeclarations]: Found implementation of procedure tree_inorder [2020-07-21 16:14:34,986 INFO L138 BoogieDeclarations]: Found implementation of procedure size [2020-07-21 16:14:34,986 INFO L138 BoogieDeclarations]: Found implementation of procedure task [2020-07-21 16:14:34,986 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 16:14:34,986 INFO L138 BoogieDeclarations]: Found implementation of procedure #Ultimate.meminit [2020-07-21 16:14:34,986 INFO L130 BoogieDeclarations]: Found specification of procedure calloc [2020-07-21 16:14:34,986 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-07-21 16:14:34,987 INFO L130 BoogieDeclarations]: Found specification of procedure free [2020-07-21 16:14:34,987 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 16:14:34,987 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2020-07-21 16:14:34,987 INFO L130 BoogieDeclarations]: Found specification of procedure assume_cycle_if_not [2020-07-21 16:14:34,987 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 16:14:34,987 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 16:14:34,988 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_tree [2020-07-21 16:14:34,988 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-07-21 16:14:34,988 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-07-21 16:14:34,988 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-07-21 16:14:34,988 INFO L130 BoogieDeclarations]: Found specification of procedure min [2020-07-21 16:14:34,988 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-07-21 16:14:34,989 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-07-21 16:14:34,989 INFO L130 BoogieDeclarations]: Found specification of procedure tree_del [2020-07-21 16:14:34,989 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-07-21 16:14:34,989 INFO L130 BoogieDeclarations]: Found specification of procedure tree_inorder [2020-07-21 16:14:34,989 INFO L130 BoogieDeclarations]: Found specification of procedure size [2020-07-21 16:14:34,989 INFO L130 BoogieDeclarations]: Found specification of procedure task [2020-07-21 16:14:34,989 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-07-21 16:14:34,989 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.meminit [2020-07-21 16:14:34,990 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 16:14:34,990 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 16:14:34,990 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 16:14:35,473 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 16:14:35,473 INFO L295 CfgBuilder]: Removed 2 assume(true) statements. [2020-07-21 16:14:35,478 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 04:14:35 BoogieIcfgContainer [2020-07-21 16:14:35,478 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 16:14:35,479 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 16:14:35,479 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 16:14:35,483 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 16:14:35,483 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 04:14:34" (1/3) ... [2020-07-21 16:14:35,484 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@668c6716 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 04:14:35, skipping insertion in model container [2020-07-21 16:14:35,484 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:14:34" (2/3) ... [2020-07-21 16:14:35,484 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@668c6716 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 04:14:35, skipping insertion in model container [2020-07-21 16:14:35,485 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 04:14:35" (3/3) ... [2020-07-21 16:14:35,487 INFO L109 eAbstractionObserver]: Analyzing ICFG tree_del_rec.c [2020-07-21 16:14:35,495 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 16:14:35,503 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 16:14:35,516 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 16:14:35,540 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 16:14:35,540 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 16:14:35,541 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 16:14:35,541 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 16:14:35,541 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 16:14:35,541 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 16:14:35,541 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 16:14:35,542 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 16:14:35,561 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states. [2020-07-21 16:14:35,570 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-07-21 16:14:35,570 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:14:35,572 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 16:14:35,572 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:14:35,578 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:14:35,578 INFO L82 PathProgramCache]: Analyzing trace with hash -1057238675, now seen corresponding path program 1 times [2020-07-21 16:14:35,587 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:14:35,588 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2083456233] [2020-07-21 16:14:35,588 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) 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 16:14:35,749 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:14:35,750 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:14:35,753 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 16:14:35,762 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:14:35,842 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 16:14:35,843 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:14:35,844 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2083456233] [2020-07-21 16:14:35,845 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:14:35,845 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-07-21 16:14:35,846 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [968832593] [2020-07-21 16:14:35,852 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-07-21 16:14:35,852 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:14:35,867 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-07-21 16:14:35,868 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-07-21 16:14:35,870 INFO L87 Difference]: Start difference. First operand 97 states. Second operand 7 states. [2020-07-21 16:14:35,972 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:14:35,972 INFO L93 Difference]: Finished difference Result 165 states and 216 transitions. [2020-07-21 16:14:35,973 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 16:14:35,974 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 44 [2020-07-21 16:14:35,975 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:14:35,991 INFO L225 Difference]: With dead ends: 165 [2020-07-21 16:14:35,991 INFO L226 Difference]: Without dead ends: 90 [2020-07-21 16:14:35,996 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 16:14:36,010 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-07-21 16:14:36,044 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 90. [2020-07-21 16:14:36,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2020-07-21 16:14:36,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 114 transitions. [2020-07-21 16:14:36,051 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 114 transitions. Word has length 44 [2020-07-21 16:14:36,051 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:14:36,051 INFO L479 AbstractCegarLoop]: Abstraction has 90 states and 114 transitions. [2020-07-21 16:14:36,052 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-07-21 16:14:36,052 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 114 transitions. [2020-07-21 16:14:36,056 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-07-21 16:14:36,056 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:14:36,056 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 16:14:36,271 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:14:36,271 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:14:36,272 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:14:36,273 INFO L82 PathProgramCache]: Analyzing trace with hash 1861604494, now seen corresponding path program 1 times [2020-07-21 16:14:36,273 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:14:36,274 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [98324850] [2020-07-21 16:14:36,275 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) 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 16:14:36,407 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:14:36,407 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:14:36,409 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 21 conjunts are in the unsatisfiable core [2020-07-21 16:14:36,421 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:14:36,500 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 16:14:36,500 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:14:36,709 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 16:14:36,709 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [98324850] [2020-07-21 16:14:36,709 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:14:36,710 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2020-07-21 16:14:36,712 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1239028544] [2020-07-21 16:14:36,716 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 16:14:36,717 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:14:36,717 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 16:14:36,717 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2020-07-21 16:14:36,717 INFO L87 Difference]: Start difference. First operand 90 states and 114 transitions. Second operand 9 states. [2020-07-21 16:14:36,945 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:14:36,945 INFO L93 Difference]: Finished difference Result 146 states and 187 transitions. [2020-07-21 16:14:36,945 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 16:14:36,946 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 56 [2020-07-21 16:14:36,946 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:14:36,949 INFO L225 Difference]: With dead ends: 146 [2020-07-21 16:14:36,949 INFO L226 Difference]: Without dead ends: 94 [2020-07-21 16:14:36,951 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 104 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2020-07-21 16:14:36,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-07-21 16:14:36,965 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 94. [2020-07-21 16:14:36,966 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2020-07-21 16:14:36,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 118 transitions. [2020-07-21 16:14:36,968 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 118 transitions. Word has length 56 [2020-07-21 16:14:36,969 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:14:36,969 INFO L479 AbstractCegarLoop]: Abstraction has 94 states and 118 transitions. [2020-07-21 16:14:36,969 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 16:14:36,969 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 118 transitions. [2020-07-21 16:14:36,972 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-07-21 16:14:36,972 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:14:36,972 INFO L422 BasicCegarLoop]: trace histogram [3, 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] [2020-07-21 16:14:37,185 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:14:37,186 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:14:37,186 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:14:37,186 INFO L82 PathProgramCache]: Analyzing trace with hash -283306239, now seen corresponding path program 1 times [2020-07-21 16:14:37,187 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:14:37,187 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [515484927] [2020-07-21 16:14:37,187 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) 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 16:14:37,302 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:14:37,303 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:14:37,304 INFO L263 TraceCheckSpWp]: Trace formula consists of 254 conjuncts, 25 conjunts are in the unsatisfiable core [2020-07-21 16:14:37,309 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:14:37,386 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-21 16:14:37,387 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:14:37,545 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-21 16:14:37,546 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [515484927] [2020-07-21 16:14:37,546 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:14:37,546 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2020-07-21 16:14:37,547 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [301684282] [2020-07-21 16:14:37,547 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 16:14:37,548 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:14:37,548 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 16:14:37,548 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2020-07-21 16:14:37,548 INFO L87 Difference]: Start difference. First operand 94 states and 118 transitions. Second operand 9 states. [2020-07-21 16:14:37,703 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:14:37,704 INFO L93 Difference]: Finished difference Result 163 states and 207 transitions. [2020-07-21 16:14:37,704 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 16:14:37,704 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 68 [2020-07-21 16:14:37,705 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:14:37,707 INFO L225 Difference]: With dead ends: 163 [2020-07-21 16:14:37,707 INFO L226 Difference]: Without dead ends: 96 [2020-07-21 16:14:37,709 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 128 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2020-07-21 16:14:37,710 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-07-21 16:14:37,721 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 96. [2020-07-21 16:14:37,722 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2020-07-21 16:14:37,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 121 transitions. [2020-07-21 16:14:37,724 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 121 transitions. Word has length 68 [2020-07-21 16:14:37,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:14:37,724 INFO L479 AbstractCegarLoop]: Abstraction has 96 states and 121 transitions. [2020-07-21 16:14:37,724 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 16:14:37,724 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 121 transitions. [2020-07-21 16:14:37,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-07-21 16:14:37,727 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:14:37,728 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] [2020-07-21 16:14:37,941 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:14:37,942 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:14:37,943 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:14:37,943 INFO L82 PathProgramCache]: Analyzing trace with hash -1958691746, now seen corresponding path program 1 times [2020-07-21 16:14:37,944 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:14:37,944 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [753125915] [2020-07-21 16:14:37,945 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) 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 16:14:38,060 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:14:38,061 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:14:38,064 INFO L263 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 27 conjunts are in the unsatisfiable core [2020-07-21 16:14:38,077 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:14:38,220 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 16:14:38,220 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:14:38,449 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 16:14:38,449 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [753125915] [2020-07-21 16:14:38,450 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:14:38,450 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 14 [2020-07-21 16:14:38,450 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1640758655] [2020-07-21 16:14:38,451 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 16:14:38,451 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:14:38,451 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 16:14:38,451 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=152, Unknown=0, NotChecked=0, Total=182 [2020-07-21 16:14:38,452 INFO L87 Difference]: Start difference. First operand 96 states and 121 transitions. Second operand 14 states. [2020-07-21 16:14:38,760 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:14:38,761 INFO L93 Difference]: Finished difference Result 162 states and 206 transitions. [2020-07-21 16:14:38,762 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 16:14:38,762 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 78 [2020-07-21 16:14:38,763 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:14:38,767 INFO L225 Difference]: With dead ends: 162 [2020-07-21 16:14:38,767 INFO L226 Difference]: Without dead ends: 98 [2020-07-21 16:14:38,768 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 144 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 16:14:38,769 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-07-21 16:14:38,781 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 98. [2020-07-21 16:14:38,781 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 98 states. [2020-07-21 16:14:38,783 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 124 transitions. [2020-07-21 16:14:38,783 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 124 transitions. Word has length 78 [2020-07-21 16:14:38,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:14:38,783 INFO L479 AbstractCegarLoop]: Abstraction has 98 states and 124 transitions. [2020-07-21 16:14:38,784 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 16:14:38,784 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 124 transitions. [2020-07-21 16:14:38,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2020-07-21 16:14:38,786 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:14:38,786 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 16:14:39,000 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:14:39,000 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:14:39,001 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:14:39,001 INFO L82 PathProgramCache]: Analyzing trace with hash -299285422, now seen corresponding path program 1 times [2020-07-21 16:14:39,002 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:14:39,002 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1943136830] [2020-07-21 16:14:39,003 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) 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 16:14:39,288 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:14:39,289 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2020-07-21 16:14:39,289 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 16:14:39,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-21 16:14:39,353 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 16:14:39,416 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-21 16:14:39,416 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-21 16:14:39,630 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:14:39,695 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 04:14:39 BoogieIcfgContainer [2020-07-21 16:14:39,695 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 16:14:39,698 INFO L168 Benchmark]: Toolchain (without parser) took 5275.33 ms. Allocated memory was 142.1 MB in the beginning and 251.1 MB in the end (delta: 109.1 MB). Free memory was 100.1 MB in the beginning and 126.0 MB in the end (delta: -25.9 MB). Peak memory consumption was 83.1 MB. Max. memory is 7.1 GB. [2020-07-21 16:14:39,699 INFO L168 Benchmark]: CDTParser took 0.22 ms. Allocated memory is still 142.1 MB. Free memory was 118.9 MB in the beginning and 118.6 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-07-21 16:14:39,700 INFO L168 Benchmark]: CACSL2BoogieTranslator took 441.75 ms. Allocated memory was 142.1 MB in the beginning and 199.8 MB in the end (delta: 57.7 MB). Free memory was 99.6 MB in the beginning and 175.6 MB in the end (delta: -75.9 MB). Peak memory consumption was 19.1 MB. Max. memory is 7.1 GB. [2020-07-21 16:14:39,701 INFO L168 Benchmark]: Boogie Preprocessor took 51.07 ms. Allocated memory is still 199.8 MB. Free memory was 175.6 MB in the beginning and 173.5 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 7.1 GB. [2020-07-21 16:14:39,701 INFO L168 Benchmark]: RCFGBuilder took 561.15 ms. Allocated memory is still 199.8 MB. Free memory was 173.5 MB in the beginning and 139.0 MB in the end (delta: 34.5 MB). Peak memory consumption was 34.5 MB. Max. memory is 7.1 GB. [2020-07-21 16:14:39,702 INFO L168 Benchmark]: TraceAbstraction took 4215.81 ms. Allocated memory was 199.8 MB in the beginning and 251.1 MB in the end (delta: 51.4 MB). Free memory was 138.3 MB in the beginning and 126.0 MB in the end (delta: 12.3 MB). Peak memory consumption was 63.7 MB. Max. memory is 7.1 GB. [2020-07-21 16:14:39,706 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.22 ms. Allocated memory is still 142.1 MB. Free memory was 118.9 MB in the beginning and 118.6 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 441.75 ms. Allocated memory was 142.1 MB in the beginning and 199.8 MB in the end (delta: 57.7 MB). Free memory was 99.6 MB in the beginning and 175.6 MB in the end (delta: -75.9 MB). Peak memory consumption was 19.1 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 51.07 ms. Allocated memory is still 199.8 MB. Free memory was 175.6 MB in the beginning and 173.5 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 7.1 GB. * RCFGBuilder took 561.15 ms. Allocated memory is still 199.8 MB. Free memory was 173.5 MB in the beginning and 139.0 MB in the end (delta: 34.5 MB). Peak memory consumption was 34.5 MB. Max. memory is 7.1 GB. * TraceAbstraction took 4215.81 ms. Allocated memory was 199.8 MB in the beginning and 251.1 MB in the end (delta: 51.4 MB). Free memory was 138.3 MB in the beginning and 126.0 MB in the end (delta: 12.3 MB). Peak memory consumption was 63.7 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))={-2:0}, n={-2:0}, 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))={-2:0}, n={-2:0}, nondet_tree()={0:0}] [L29] n->right = nondet_tree() [L30] return n; VAL [\result={-2:0}, malloc(sizeof(struct node))={-2:0}, n={-2:0}] [L100] RET, EXPR nondet_tree() VAL [nondet_tree()={-2:0}] [L100] CALL task(nondet_tree()) VAL [t={-2:0}] [L76] CALL, EXPR min(t) VAL [n={-2:0}] [L35] COND FALSE !(!n) [L38] EXPR n->data [L38] int a = n->data; [L39] EXPR n->left VAL [a=2147483647, n={-2:0}, n={-2:0}, 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={-2:0}, n={-2:0}, n->left={0:0}] [L39] int b = min(n->left); [L40] EXPR n->right VAL [a=2147483647, b=2147483647, n={-2:0}, n={-2:0}, 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={-2:0}, n={-2:0}, 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={-2:0}, n={-2:0}] [L76] RET, EXPR min(t) VAL [min(t)=2147483647, t={-2:0}, t={-2:0}] [L76] int a = min(t); [L77] int b; VAL [a=2147483647, b={2:0}, t={-2:0}, t={-2:0}] [L79] CALL, EXPR size(t) VAL [t={-2:0}] [L71] COND FALSE !(!t) [L72] EXPR t->left VAL [t={-2:0}, t={-2:0}, 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={-2:0}, t={-2:0}, t->left={0:0}] [L72] EXPR t->right VAL [size(t->left)=0, t={-2:0}, t={-2:0}, 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={-2:0}, t={-2:0}, 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={2:0}, size(t)=1, t={-2:0}, t={-2:0}] [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={2:0}, n=1, t={-2:0}, t={-2:0}] [L81] EXPR, FCALL calloc(n, sizeof(int)) VAL [a=2147483647, b={2:0}, calloc(n, sizeof(int))={-3:0}, n=1, t={-2:0}, t={-2:0}] [L81] int *x = calloc(n, sizeof(int)); VAL [a=2147483647, b={2:0}, calloc(n, sizeof(int))={-3:0}, n=1, t={-2:0}, t={-2:0}, x={-3:0}] [L82] CALL tree_inorder(t, x, n) VAL [\old(i)=1, a={-3:0}, t={-2:0}] [L60] COND FALSE !(!t) [L63] EXPR t->left VAL [\old(i)=1, a={-3:0}, a={-3:0}, i=1, t={-2:0}, t={-2:0}, t->left={0:0}] [L63] CALL, EXPR tree_inorder(t->left, a, i) VAL [\old(i)=1, a={-3:0}, t={0:0}] [L60] COND TRUE !t [L61] return i; VAL [\old(i)=1, \result=1, a={-3:0}, a={-3:0}, i=1, t={0:0}, t={0:0}] [L63] RET, EXPR tree_inorder(t->left, a, i) VAL [\old(i)=1, a={-3:0}, a={-3:0}, i=1, t={-2:0}, t={-2:0}, 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={-3:0}, a={-3:0}, i=2, t={-2:0}, t={-2:0}, t->right={0:0}] [L65] CALL, EXPR tree_inorder(t->right, a, i) VAL [\old(i)=2, a={-3:0}, t={0:0}] [L60] COND TRUE !t [L61] return i; VAL [\old(i)=2, \result=2, a={-3:0}, a={-3:0}, i=2, t={0:0}, t={0:0}] [L65] RET, EXPR tree_inorder(t->right, a, i) VAL [\old(i)=1, a={-3:0}, a={-3:0}, i=2, t={-2:0}, t={-2:0}, 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={-3:0}, a={-3:0}, i=2, t={-2:0}, t={-2:0}] [L82] RET tree_inorder(t, x, n) VAL [a=2147483647, b={2:0}, calloc(n, sizeof(int))={-3:0}, n=1, t={-2:0}, t={-2:0}, tree_inorder(t, x, n)=2, x={-3:0}] [L83] EXPR x[0] VAL [a=2147483647, b={2:0}, calloc(n, sizeof(int))={-3:0}, n=1, t={-2:0}, t={-2:0}, x={-3:0}, 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: 4.0s, OverallIterations: 5, TraceHistogramMax: 3, AutomataDifference: 0.8s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 421 SDtfs, 113 SDslu, 2398 SDs, 0 SdLazy, 418 SolverSat, 56 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.4s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 458 GetRequests, 414 SyntacticMatches, 3 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.4s 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: 0.0s AutomataMinimizationTime, 4 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.4s SatisfiabilityAnalysisTime, 1.0s InterpolantComputationTime, 337 NumberOfCodeBlocks, 236 NumberOfCodeBlocksAsserted, 7 NumberOfCheckSat, 441 ConstructedInterpolants, 0 QuantifiedInterpolants, 82386 SizeOfPredicates, 25 NumberOfNonLiveVariables, 936 ConjunctsInSsa, 84 ConjunctsInUnsatCore, 7 InterpolantComputations, 1 PerfectInterpolantSequences, 126/138 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...