/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 4 -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 [2020-07-20 17:10:59,039 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 17:10:59,043 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 17:10:59,066 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 17:10:59,066 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 17:10:59,069 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 17:10:59,072 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 17:10:59,084 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 17:10:59,090 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 17:10:59,093 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 17:10:59,096 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 17:10:59,098 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 17:10:59,098 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 17:10:59,102 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 17:10:59,104 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 17:10:59,106 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 17:10:59,109 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 17:10:59,110 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 17:10:59,112 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 17:10:59,118 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 17:10:59,124 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 17:10:59,129 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 17:10:59,131 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 17:10:59,132 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 17:10:59,136 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-07-20 17:10:59,136 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-07-20 17:10:59,136 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-07-20 17:10:59,139 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-07-20 17:10:59,140 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-07-20 17:10:59,141 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... 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[2020-07-20 17:10:59,148 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 17:10:59,149 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 17:10:59,151 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 17:10:59,152 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 [2020-07-20 17:10:59,196 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 17:10:59,197 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 17:10:59,198 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 17:10:59,199 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 17:10:59,199 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 17:10:59,199 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 17:10:59,200 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 17:10:59,200 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 17:10:59,200 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 17:10:59,200 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 17:10:59,201 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 17:10:59,201 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 17:10:59,201 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 17:10:59,201 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 17:10:59,202 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 17:10:59,202 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 17:10:59,202 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 17:10:59,202 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 17:10:59,202 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 17:10:59,203 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 17:10:59,203 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 17:10:59,203 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 17:10:59,203 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 17:10:59,203 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 17:10:59,204 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 17:10:59,204 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 17:10:59,204 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:10:59,204 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 17:10:59,205 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 17:10:59,205 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 -> 4 [2020-07-20 17:10:59,552 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 17:10:59,568 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 17:10:59,573 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 17:10:59,576 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 17:10:59,576 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 17:10:59,577 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/verifythis/tree_del_rec.c [2020-07-20 17:10:59,662 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/72e3aa8b2/e0216c18cffd4ff9859a2f955eb38bff/FLAG9cf2114b7 [2020-07-20 17:11:00,370 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 17:11:00,371 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/verifythis/tree_del_rec.c [2020-07-20 17:11:00,381 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/72e3aa8b2/e0216c18cffd4ff9859a2f955eb38bff/FLAG9cf2114b7 [2020-07-20 17:11:00,662 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/72e3aa8b2/e0216c18cffd4ff9859a2f955eb38bff [2020-07-20 17:11:00,675 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 17:11:00,678 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 17:11:00,679 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 17:11:00,680 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 17:11:00,684 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 17:11:00,686 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 05:11:00" (1/1) ... [2020-07-20 17:11:00,690 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1a81f301 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:11:00, skipping insertion in model container [2020-07-20 17:11:00,690 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 05:11:00" (1/1) ... [2020-07-20 17:11:00,700 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 17:11:00,730 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 17:11:00,994 WARN L1484 CHandler]: Possible shadowing of function min [2020-07-20 17:11:01,000 WARN L1484 CHandler]: Possible shadowing of function min [2020-07-20 17:11:01,022 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 17:11:01,045 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 17:11:01,184 WARN L1484 CHandler]: Possible shadowing of function min [2020-07-20 17:11:01,186 WARN L1484 CHandler]: Possible shadowing of function min [2020-07-20 17:11:01,201 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 17:11:01,227 INFO L208 MainTranslator]: Completed translation [2020-07-20 17:11:01,228 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:11:01 WrapperNode [2020-07-20 17:11:01,228 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 17:11:01,229 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 17:11:01,230 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 17:11:01,230 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 17:11:01,244 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:11:01" (1/1) ... [2020-07-20 17:11:01,245 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:11:01" (1/1) ... [2020-07-20 17:11:01,260 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:11:01" (1/1) ... [2020-07-20 17:11:01,261 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:11:01" (1/1) ... [2020-07-20 17:11:01,282 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:11:01" (1/1) ... [2020-07-20 17:11:01,291 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:11:01" (1/1) ... [2020-07-20 17:11:01,294 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:11:01" (1/1) ... [2020-07-20 17:11:01,300 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 17:11:01,301 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 17:11:01,301 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 17:11:01,301 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 17:11:01,309 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:11:01" (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 [2020-07-20 17:11:01,404 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 17:11:01,404 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 17:11:01,404 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_cycle_if_not [2020-07-20 17:11:01,405 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-20 17:11:01,405 INFO L138 BoogieDeclarations]: Found implementation of procedure nondet_tree [2020-07-20 17:11:01,405 INFO L138 BoogieDeclarations]: Found implementation of procedure min [2020-07-20 17:11:01,405 INFO L138 BoogieDeclarations]: Found implementation of procedure tree_del [2020-07-20 17:11:01,405 INFO L138 BoogieDeclarations]: Found implementation of procedure tree_inorder [2020-07-20 17:11:01,406 INFO L138 BoogieDeclarations]: Found implementation of procedure size [2020-07-20 17:11:01,406 INFO L138 BoogieDeclarations]: Found implementation of procedure task [2020-07-20 17:11:01,406 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 17:11:01,406 INFO L138 BoogieDeclarations]: Found implementation of procedure #Ultimate.meminit [2020-07-20 17:11:01,407 INFO L130 BoogieDeclarations]: Found specification of procedure calloc [2020-07-20 17:11:01,407 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-07-20 17:11:01,407 INFO L130 BoogieDeclarations]: Found specification of procedure free [2020-07-20 17:11:01,407 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 17:11:01,407 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2020-07-20 17:11:01,408 INFO L130 BoogieDeclarations]: Found specification of procedure assume_cycle_if_not [2020-07-20 17:11:01,409 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 17:11:01,409 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-20 17:11:01,410 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_tree [2020-07-20 17:11:01,410 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-07-20 17:11:01,410 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-07-20 17:11:01,411 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-07-20 17:11:01,411 INFO L130 BoogieDeclarations]: Found specification of procedure min [2020-07-20 17:11:01,411 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-07-20 17:11:01,411 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-07-20 17:11:01,411 INFO L130 BoogieDeclarations]: Found specification of procedure tree_del [2020-07-20 17:11:01,411 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-07-20 17:11:01,411 INFO L130 BoogieDeclarations]: Found specification of procedure tree_inorder [2020-07-20 17:11:01,411 INFO L130 BoogieDeclarations]: Found specification of procedure size [2020-07-20 17:11:01,412 INFO L130 BoogieDeclarations]: Found specification of procedure task [2020-07-20 17:11:01,412 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-07-20 17:11:01,412 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.meminit [2020-07-20 17:11:01,412 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 17:11:01,412 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 17:11:01,412 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 17:11:02,062 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 17:11:02,063 INFO L295 CfgBuilder]: Removed 2 assume(true) statements. [2020-07-20 17:11:02,070 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 05:11:02 BoogieIcfgContainer [2020-07-20 17:11:02,071 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 17:11:02,072 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 17:11:02,073 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 17:11:02,077 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 17:11:02,078 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 05:11:00" (1/3) ... [2020-07-20 17:11:02,079 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7523ed3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 05:11:02, skipping insertion in model container [2020-07-20 17:11:02,079 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:11:01" (2/3) ... [2020-07-20 17:11:02,080 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7523ed3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 05:11:02, skipping insertion in model container [2020-07-20 17:11:02,080 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 05:11:02" (3/3) ... [2020-07-20 17:11:02,083 INFO L109 eAbstractionObserver]: Analyzing ICFG tree_del_rec.c [2020-07-20 17:11:02,097 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 17:11:02,107 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 17:11:02,122 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 17:11:02,155 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 17:11:02,156 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 17:11:02,156 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 17:11:02,156 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 17:11:02,156 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 17:11:02,157 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 17:11:02,157 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 17:11:02,157 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 17:11:02,181 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states. [2020-07-20 17:11:02,193 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-07-20 17:11:02,193 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:11:02,195 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] [2020-07-20 17:11:02,195 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:11:02,202 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:11:02,202 INFO L82 PathProgramCache]: Analyzing trace with hash -1057238675, now seen corresponding path program 1 times [2020-07-20 17:11:02,211 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:11:02,212 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1943844302] [2020-07-20 17:11:02,213 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 [2020-07-20 17:11:02,403 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:11:02,404 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:11:02,409 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-20 17:11:02,419 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:11:02,527 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:11:02,528 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:11:02,529 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1943844302] [2020-07-20 17:11:02,530 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:11:02,531 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-07-20 17:11:02,532 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [34072237] [2020-07-20 17:11:02,540 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-07-20 17:11:02,541 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:11:02,562 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-07-20 17:11:02,563 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-07-20 17:11:02,567 INFO L87 Difference]: Start difference. First operand 97 states. Second operand 7 states. [2020-07-20 17:11:02,729 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:11:02,730 INFO L93 Difference]: Finished difference Result 165 states and 216 transitions. [2020-07-20 17:11:02,731 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 17:11:02,732 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 44 [2020-07-20 17:11:02,733 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:11:02,752 INFO L225 Difference]: With dead ends: 165 [2020-07-20 17:11:02,753 INFO L226 Difference]: Without dead ends: 90 [2020-07-20 17:11:02,760 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 [2020-07-20 17:11:02,787 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-07-20 17:11:02,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 90. [2020-07-20 17:11:02,848 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2020-07-20 17:11:02,852 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 114 transitions. [2020-07-20 17:11:02,855 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 114 transitions. Word has length 44 [2020-07-20 17:11:02,855 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:11:02,856 INFO L479 AbstractCegarLoop]: Abstraction has 90 states and 114 transitions. [2020-07-20 17:11:02,856 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-07-20 17:11:02,856 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 114 transitions. [2020-07-20 17:11:02,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-07-20 17:11:02,861 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:11:02,862 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] [2020-07-20 17:11:03,072 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:11:03,075 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:11:03,076 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:11:03,076 INFO L82 PathProgramCache]: Analyzing trace with hash 1861604494, now seen corresponding path program 1 times [2020-07-20 17:11:03,077 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:11:03,077 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1949589994] [2020-07-20 17:11:03,077 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 [2020-07-20 17:11:03,259 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 17:11:03,260 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:11:03,264 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 21 conjunts are in the unsatisfiable core [2020-07-20 17:11:03,281 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:11:03,378 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-20 17:11:03,379 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:11:03,615 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-20 17:11:03,616 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1949589994] [2020-07-20 17:11:03,616 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:11:03,616 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2020-07-20 17:11:03,617 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1470964278] [2020-07-20 17:11:03,619 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 17:11:03,620 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:11:03,620 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 17:11:03,621 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2020-07-20 17:11:03,621 INFO L87 Difference]: Start difference. First operand 90 states and 114 transitions. Second operand 9 states. [2020-07-20 17:11:03,874 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:11:03,875 INFO L93 Difference]: Finished difference Result 146 states and 187 transitions. [2020-07-20 17:11:03,875 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 17:11:03,875 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 56 [2020-07-20 17:11:03,876 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:11:03,879 INFO L225 Difference]: With dead ends: 146 [2020-07-20 17:11:03,880 INFO L226 Difference]: Without dead ends: 94 [2020-07-20 17:11:03,882 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 [2020-07-20 17:11:03,883 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-07-20 17:11:03,899 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 94. [2020-07-20 17:11:03,899 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2020-07-20 17:11:03,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 118 transitions. [2020-07-20 17:11:03,902 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 118 transitions. Word has length 56 [2020-07-20 17:11:03,902 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:11:03,903 INFO L479 AbstractCegarLoop]: Abstraction has 94 states and 118 transitions. [2020-07-20 17:11:03,903 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 17:11:03,903 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 118 transitions. [2020-07-20 17:11:03,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-07-20 17:11:03,906 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:11:03,907 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] [2020-07-20 17:11:04,121 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:11:04,122 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:11:04,122 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:11:04,123 INFO L82 PathProgramCache]: Analyzing trace with hash -283306239, now seen corresponding path program 1 times [2020-07-20 17:11:04,123 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:11:04,124 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [660301871] [2020-07-20 17:11:04,124 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 [2020-07-20 17:11:04,250 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 17:11:04,251 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:11:04,254 INFO L263 TraceCheckSpWp]: Trace formula consists of 254 conjuncts, 25 conjunts are in the unsatisfiable core [2020-07-20 17:11:04,260 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:11:04,420 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-20 17:11:04,421 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:11:04,619 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-20 17:11:04,619 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [660301871] [2020-07-20 17:11:04,620 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:11:04,620 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2020-07-20 17:11:04,620 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1913813591] [2020-07-20 17:11:04,621 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 17:11:04,621 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:11:04,621 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 17:11:04,622 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2020-07-20 17:11:04,622 INFO L87 Difference]: Start difference. First operand 94 states and 118 transitions. Second operand 9 states. [2020-07-20 17:11:04,805 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:11:04,806 INFO L93 Difference]: Finished difference Result 163 states and 207 transitions. [2020-07-20 17:11:04,806 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 17:11:04,807 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 68 [2020-07-20 17:11:04,808 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:11:04,810 INFO L225 Difference]: With dead ends: 163 [2020-07-20 17:11:04,811 INFO L226 Difference]: Without dead ends: 96 [2020-07-20 17:11:04,812 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 128 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2020-07-20 17:11:04,813 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-07-20 17:11:04,827 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 96. [2020-07-20 17:11:04,827 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2020-07-20 17:11:04,829 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 121 transitions. [2020-07-20 17:11:04,830 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 121 transitions. Word has length 68 [2020-07-20 17:11:04,830 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:11:04,830 INFO L479 AbstractCegarLoop]: Abstraction has 96 states and 121 transitions. [2020-07-20 17:11:04,830 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 17:11:04,831 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 121 transitions. [2020-07-20 17:11:04,834 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-07-20 17:11:04,835 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:11:04,835 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] [2020-07-20 17:11:05,046 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:11:05,047 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:11:05,047 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:11:05,048 INFO L82 PathProgramCache]: Analyzing trace with hash -1958691746, now seen corresponding path program 1 times [2020-07-20 17:11:05,048 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:11:05,048 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [669773903] [2020-07-20 17:11:05,049 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 [2020-07-20 17:11:05,231 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 17:11:05,231 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:11:05,235 INFO L263 TraceCheckSpWp]: Trace formula consists of 296 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-20 17:11:05,247 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:11:05,330 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2020-07-20 17:11:05,331 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:11:05,332 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [669773903] [2020-07-20 17:11:05,332 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:11:05,332 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2020-07-20 17:11:05,333 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [822774833] [2020-07-20 17:11:05,334 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 17:11:05,334 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:11:05,334 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 17:11:05,336 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-07-20 17:11:05,336 INFO L87 Difference]: Start difference. First operand 96 states and 121 transitions. Second operand 9 states. [2020-07-20 17:11:05,521 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:11:05,521 INFO L93 Difference]: Finished difference Result 166 states and 209 transitions. [2020-07-20 17:11:05,522 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 17:11:05,522 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 78 [2020-07-20 17:11:05,522 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:11:05,525 INFO L225 Difference]: With dead ends: 166 [2020-07-20 17:11:05,525 INFO L226 Difference]: Without dead ends: 98 [2020-07-20 17:11:05,526 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 71 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2020-07-20 17:11:05,527 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-07-20 17:11:05,540 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 98. [2020-07-20 17:11:05,540 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 98 states. [2020-07-20 17:11:05,542 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 124 transitions. [2020-07-20 17:11:05,543 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 124 transitions. Word has length 78 [2020-07-20 17:11:05,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:11:05,543 INFO L479 AbstractCegarLoop]: Abstraction has 98 states and 124 transitions. [2020-07-20 17:11:05,544 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 17:11:05,544 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 124 transitions. [2020-07-20 17:11:05,547 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2020-07-20 17:11:05,548 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:11:05,548 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] [2020-07-20 17:11:05,761 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:11:05,762 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:11:05,763 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:11:05,763 INFO L82 PathProgramCache]: Analyzing trace with hash -299285422, now seen corresponding path program 1 times [2020-07-20 17:11:05,763 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:11:05,763 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1925327540] [2020-07-20 17:11:05,764 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 [2020-07-20 17:11:06,056 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:11:06,056 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2020-07-20 17:11:06,057 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 17:11:06,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-20 17:11:06,126 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 17:11:06,210 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-20 17:11:06,210 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-20 17:11:06,424 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:11:06,562 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 05:11:06 BoogieIcfgContainer [2020-07-20 17:11:06,565 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 17:11:06,572 INFO L168 Benchmark]: Toolchain (without parser) took 5890.48 ms. Allocated memory was 145.8 MB in the beginning and 245.9 MB in the end (delta: 100.1 MB). Free memory was 102.0 MB in the beginning and 170.2 MB in the end (delta: -68.2 MB). Peak memory consumption was 32.0 MB. Max. memory is 7.1 GB. [2020-07-20 17:11:06,573 INFO L168 Benchmark]: CDTParser took 0.23 ms. Allocated memory is still 145.8 MB. Free memory is still 121.6 MB. There was no memory consumed. Max. memory is 7.1 GB. [2020-07-20 17:11:06,574 INFO L168 Benchmark]: CACSL2BoogieTranslator took 549.65 ms. Allocated memory was 145.8 MB in the beginning and 203.9 MB in the end (delta: 58.2 MB). Free memory was 101.6 MB in the beginning and 179.6 MB in the end (delta: -78.0 MB). Peak memory consumption was 19.2 MB. Max. memory is 7.1 GB. [2020-07-20 17:11:06,575 INFO L168 Benchmark]: Boogie Preprocessor took 70.79 ms. Allocated memory is still 203.9 MB. Free memory was 179.6 MB in the beginning and 177.7 MB in the end (delta: 1.9 MB). Peak memory consumption was 1.9 MB. Max. memory is 7.1 GB. [2020-07-20 17:11:06,580 INFO L168 Benchmark]: RCFGBuilder took 770.08 ms. Allocated memory is still 203.9 MB. Free memory was 177.7 MB in the beginning and 143.3 MB in the end (delta: 34.4 MB). Peak memory consumption was 34.4 MB. Max. memory is 7.1 GB. [2020-07-20 17:11:06,582 INFO L168 Benchmark]: TraceAbstraction took 4492.46 ms. Allocated memory was 203.9 MB in the beginning and 245.9 MB in the end (delta: 41.9 MB). Free memory was 142.4 MB in the beginning and 170.2 MB in the end (delta: -27.8 MB). Peak memory consumption was 14.2 MB. Max. memory is 7.1 GB. [2020-07-20 17:11:06,587 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 145.8 MB. Free memory is still 121.6 MB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 549.65 ms. Allocated memory was 145.8 MB in the beginning and 203.9 MB in the end (delta: 58.2 MB). Free memory was 101.6 MB in the beginning and 179.6 MB in the end (delta: -78.0 MB). Peak memory consumption was 19.2 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 70.79 ms. Allocated memory is still 203.9 MB. Free memory was 179.6 MB in the beginning and 177.7 MB in the end (delta: 1.9 MB). Peak memory consumption was 1.9 MB. Max. memory is 7.1 GB. * RCFGBuilder took 770.08 ms. Allocated memory is still 203.9 MB. Free memory was 177.7 MB in the beginning and 143.3 MB in the end (delta: 34.4 MB). Peak memory consumption was 34.4 MB. Max. memory is 7.1 GB. * TraceAbstraction took 4492.46 ms. Allocated memory was 203.9 MB in the beginning and 245.9 MB in the end (delta: 41.9 MB). Free memory was 142.4 MB in the beginning and 170.2 MB in the end (delta: -27.8 MB). Peak memory consumption was 14.2 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={18750:0}, 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={18750:0}, 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={18750:0}, n=1, t={-1:0}, t={-1:0}] [L81] EXPR, FCALL calloc(n, sizeof(int)) VAL [a=2147483647, b={18750:0}, calloc(n, sizeof(int))={18748:0}, n=1, t={-1:0}, t={-1:0}] [L81] int *x = calloc(n, sizeof(int)); VAL [a=2147483647, b={18750:0}, calloc(n, sizeof(int))={18748:0}, n=1, t={-1:0}, t={-1:0}, x={18748:0}] [L82] CALL tree_inorder(t, x, n) VAL [\old(i)=1, a={18748:0}, t={-1:0}] [L60] COND FALSE !(!t) [L63] EXPR t->left VAL [\old(i)=1, a={18748:0}, a={18748:0}, 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={18748:0}, t={0:0}] [L60] COND TRUE !t [L61] return i; VAL [\old(i)=1, \result=1, a={18748:0}, a={18748:0}, i=1, t={0:0}, t={0:0}] [L63] RET, EXPR tree_inorder(t->left, a, i) VAL [\old(i)=1, a={18748:0}, a={18748:0}, 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={18748:0}, a={18748:0}, 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={18748:0}, t={0:0}] [L60] COND TRUE !t [L61] return i; VAL [\old(i)=2, \result=2, a={18748:0}, a={18748:0}, i=2, t={0:0}, t={0:0}] [L65] RET, EXPR tree_inorder(t->right, a, i) VAL [\old(i)=1, a={18748:0}, a={18748:0}, 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={18748:0}, a={18748:0}, i=2, t={-1:0}, t={-1:0}] [L82] RET tree_inorder(t, x, n) VAL [a=2147483647, b={18750:0}, calloc(n, sizeof(int))={18748:0}, n=1, t={-1:0}, t={-1:0}, tree_inorder(t, x, n)=2, x={18748:0}] [L83] EXPR x[0] VAL [a=2147483647, b={18750:0}, calloc(n, sizeof(int))={18748:0}, n=1, t={-1:0}, t={-1:0}, x={18748:0}, 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: 4.2s, OverallIterations: 5, TraceHistogramMax: 3, AutomataDifference: 0.8s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 424 SDtfs, 85 SDslu, 2327 SDs, 0 SdLazy, 305 SolverSat, 39 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 377 GetRequests, 341 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 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: 0.1s AutomataMinimizationTime, 4 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.5s SatisfiabilityAnalysisTime, 0.9s InterpolantComputationTime, 337 NumberOfCodeBlocks, 237 NumberOfCodeBlocksAsserted, 14 NumberOfCheckSat, 364 ConstructedInterpolants, 0 QuantifiedInterpolants, 58516 SizeOfPredicates, 20 NumberOfNonLiveVariables, 940 ConjunctsInSsa, 74 ConjunctsInUnsatCore, 6 InterpolantComputations, 2 PerfectInterpolantSequences, 97/105 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...