/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks NOT_INCREMENTALLY -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/verifythis/tree_del_rec_incorrect.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 11:11:50,482 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 11:11:50,485 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 11:11:50,507 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 11:11:50,507 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 11:11:50,509 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 11:11:50,511 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 11:11:50,523 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 11:11:50,527 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 11:11:50,531 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 11:11:50,532 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 11:11:50,534 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 11:11:50,534 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 11:11:50,536 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 11:11:50,539 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 11:11:50,542 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 11:11:50,544 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 11:11:50,545 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 11:11:50,547 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 11:11:50,552 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 11:11:50,558 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 11:11:50,561 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 11:11:50,562 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 11:11:50,563 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 11:11:50,566 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-07-21 11:11:50,566 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-07-21 11:11:50,566 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-07-21 11:11:50,569 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-07-21 11:11:50,569 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-07-21 11:11:50,571 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-07-21 11:11:50,571 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-07-21 11:11:50,572 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-07-21 11:11:50,573 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-07-21 11:11:50,574 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-07-21 11:11:50,575 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-07-21 11:11:50,575 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-07-21 11:11:50,576 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-07-21 11:11:50,576 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-07-21 11:11:50,577 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 11:11:50,578 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 11:11:50,579 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 11:11:50,581 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 11:11:50,615 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 11:11:50,615 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 11:11:50,618 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 11:11:50,619 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 11:11:50,619 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 11:11:50,619 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 11:11:50,619 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 11:11:50,620 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 11:11:50,620 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 11:11:50,620 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 11:11:50,620 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 11:11:50,620 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 11:11:50,621 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 11:11:50,621 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 11:11:50,621 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 11:11:50,622 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 11:11:50,623 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 11:11:50,623 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 11:11:50,623 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 11:11:50,623 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 11:11:50,623 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 11:11:50,624 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 11:11:50,624 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 11:11:50,624 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 11:11:50,624 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 11:11:50,624 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 11:11:50,625 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:11:50,625 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 11:11:50,625 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 11:11:50,625 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> NOT_INCREMENTALLY [2020-07-21 11:11:51,008 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 11:11:51,033 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 11:11:51,039 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 11:11:51,041 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 11:11:51,042 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 11:11:51,043 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/verifythis/tree_del_rec_incorrect.c [2020-07-21 11:11:51,131 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/70246e7cb/d98e020b76d940ea81aaaf12a83a193e/FLAG06a615eb1 [2020-07-21 11:11:51,629 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 11:11:51,630 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/verifythis/tree_del_rec_incorrect.c [2020-07-21 11:11:51,638 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/70246e7cb/d98e020b76d940ea81aaaf12a83a193e/FLAG06a615eb1 [2020-07-21 11:11:51,997 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/70246e7cb/d98e020b76d940ea81aaaf12a83a193e [2020-07-21 11:11:52,007 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 11:11:52,010 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 11:11:52,012 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 11:11:52,012 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 11:11:52,016 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 11:11:52,017 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 11:11:51" (1/1) ... [2020-07-21 11:11:52,020 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@dde9e46 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:11:52, skipping insertion in model container [2020-07-21 11:11:52,021 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 11:11:51" (1/1) ... [2020-07-21 11:11:52,029 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 11:11:52,057 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 11:11:52,248 WARN L1484 CHandler]: Possible shadowing of function min [2020-07-21 11:11:52,251 WARN L1484 CHandler]: Possible shadowing of function min [2020-07-21 11:11:52,270 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 11:11:52,290 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 11:11:52,511 WARN L1484 CHandler]: Possible shadowing of function min [2020-07-21 11:11:52,516 WARN L1484 CHandler]: Possible shadowing of function min [2020-07-21 11:11:52,543 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 11:11:52,568 INFO L208 MainTranslator]: Completed translation [2020-07-21 11:11:52,569 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:11:52 WrapperNode [2020-07-21 11:11:52,569 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 11:11:52,570 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 11:11:52,570 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 11:11:52,570 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 11:11:52,584 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:11:52" (1/1) ... [2020-07-21 11:11:52,584 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:11:52" (1/1) ... [2020-07-21 11:11:52,600 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:11:52" (1/1) ... [2020-07-21 11:11:52,600 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:11:52" (1/1) ... [2020-07-21 11:11:52,619 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:11:52" (1/1) ... [2020-07-21 11:11:52,625 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:11:52" (1/1) ... [2020-07-21 11:11:52,628 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:11:52" (1/1) ... [2020-07-21 11:11:52,636 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 11:11:52,639 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 11:11:52,640 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 11:11:52,640 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 11:11:52,641 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:11:52" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 11:11:52,712 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 11:11:52,712 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 11:11:52,713 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-21 11:11:52,713 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-21 11:11:52,714 INFO L138 BoogieDeclarations]: Found implementation of procedure nondet_tree [2020-07-21 11:11:52,714 INFO L138 BoogieDeclarations]: Found implementation of procedure min [2020-07-21 11:11:52,714 INFO L138 BoogieDeclarations]: Found implementation of procedure tree_del [2020-07-21 11:11:52,714 INFO L138 BoogieDeclarations]: Found implementation of procedure tree_inorder [2020-07-21 11:11:52,715 INFO L138 BoogieDeclarations]: Found implementation of procedure size [2020-07-21 11:11:52,716 INFO L138 BoogieDeclarations]: Found implementation of procedure task [2020-07-21 11:11:52,716 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 11:11:52,718 INFO L138 BoogieDeclarations]: Found implementation of procedure #Ultimate.meminit [2020-07-21 11:11:52,718 INFO L130 BoogieDeclarations]: Found specification of procedure calloc [2020-07-21 11:11:52,719 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-07-21 11:11:52,719 INFO L130 BoogieDeclarations]: Found specification of procedure free [2020-07-21 11:11:52,720 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 11:11:52,720 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2020-07-21 11:11:52,720 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-21 11:11:52,722 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-21 11:11:52,722 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 11:11:52,722 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 11:11:52,722 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_tree [2020-07-21 11:11:52,722 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-07-21 11:11:52,723 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-07-21 11:11:52,723 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-07-21 11:11:52,723 INFO L130 BoogieDeclarations]: Found specification of procedure min [2020-07-21 11:11:52,723 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-07-21 11:11:52,723 INFO L130 BoogieDeclarations]: Found specification of procedure tree_del [2020-07-21 11:11:52,723 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-07-21 11:11:52,723 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-07-21 11:11:52,724 INFO L130 BoogieDeclarations]: Found specification of procedure tree_inorder [2020-07-21 11:11:52,724 INFO L130 BoogieDeclarations]: Found specification of procedure size [2020-07-21 11:11:52,724 INFO L130 BoogieDeclarations]: Found specification of procedure task [2020-07-21 11:11:52,724 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-07-21 11:11:52,724 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.meminit [2020-07-21 11:11:52,725 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 11:11:52,725 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 11:11:52,725 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 11:11:53,274 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 11:11:53,275 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-21 11:11:53,281 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 11:11:53 BoogieIcfgContainer [2020-07-21 11:11:53,281 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 11:11:53,283 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 11:11:53,283 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 11:11:53,288 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 11:11:53,289 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 11:11:51" (1/3) ... [2020-07-21 11:11:53,289 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2abba793 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 11:11:53, skipping insertion in model container [2020-07-21 11:11:53,290 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:11:52" (2/3) ... [2020-07-21 11:11:53,290 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2abba793 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 11:11:53, skipping insertion in model container [2020-07-21 11:11:53,291 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 11:11:53" (3/3) ... [2020-07-21 11:11:53,293 INFO L109 eAbstractionObserver]: Analyzing ICFG tree_del_rec_incorrect.c [2020-07-21 11:11:53,306 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 11:11:53,315 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 11:11:53,329 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 11:11:53,354 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 11:11:53,354 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 11:11:53,355 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 11:11:53,355 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 11:11:53,355 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 11:11:53,355 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 11:11:53,356 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 11:11:53,356 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 11:11:53,376 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states. [2020-07-21 11:11:53,385 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-07-21 11:11:53,386 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:11:53,387 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:11:53,387 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:11:53,393 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:11:53,393 INFO L82 PathProgramCache]: Analyzing trace with hash 1217563597, now seen corresponding path program 1 times [2020-07-21 11:11:53,401 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:11:53,401 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1404330003] [2020-07-21 11:11:53,402 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:11:53,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:11:53,550 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 1 conjunts are in the unsatisfiable core [2020-07-21 11:11:53,559 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:11:53,594 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:11:53,595 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 11:11:53,597 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1404330003] [2020-07-21 11:11:53,598 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 11:11:53,598 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-07-21 11:11:53,599 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1779018999] [2020-07-21 11:11:53,605 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-07-21 11:11:53,606 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:11:53,622 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-07-21 11:11:53,623 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-21 11:11:53,626 INFO L87 Difference]: Start difference. First operand 95 states. Second operand 2 states. [2020-07-21 11:11:53,670 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:11:53,670 INFO L93 Difference]: Finished difference Result 159 states and 202 transitions. [2020-07-21 11:11:53,671 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-07-21 11:11:53,672 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 44 [2020-07-21 11:11:53,673 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:11:53,687 INFO L225 Difference]: With dead ends: 159 [2020-07-21 11:11:53,688 INFO L226 Difference]: Without dead ends: 87 [2020-07-21 11:11:53,694 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-21 11:11:53,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2020-07-21 11:11:53,753 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 87. [2020-07-21 11:11:53,755 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2020-07-21 11:11:53,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 108 transitions. [2020-07-21 11:11:53,761 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 108 transitions. Word has length 44 [2020-07-21 11:11:53,764 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:11:53,764 INFO L479 AbstractCegarLoop]: Abstraction has 87 states and 108 transitions. [2020-07-21 11:11:53,764 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-07-21 11:11:53,764 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 108 transitions. [2020-07-21 11:11:53,769 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-07-21 11:11:53,770 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:11:53,770 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:11:53,986 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:11:53,987 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:11:53,988 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:11:53,988 INFO L82 PathProgramCache]: Analyzing trace with hash -471380145, now seen corresponding path program 1 times [2020-07-21 11:11:53,989 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:11:53,989 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [620702464] [2020-07-21 11:11:53,989 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:11:54,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:11:54,093 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 11:11:54,109 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:11:54,204 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:11:54,205 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 11:11:54,206 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [620702464] [2020-07-21 11:11:54,206 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 11:11:54,206 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-07-21 11:11:54,206 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1807005750] [2020-07-21 11:11:54,209 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-07-21 11:11:54,209 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:11:54,210 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-07-21 11:11:54,210 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-07-21 11:11:54,210 INFO L87 Difference]: Start difference. First operand 87 states and 108 transitions. Second operand 7 states. [2020-07-21 11:11:54,285 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:11:54,286 INFO L93 Difference]: Finished difference Result 145 states and 183 transitions. [2020-07-21 11:11:54,286 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 11:11:54,287 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 44 [2020-07-21 11:11:54,287 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:11:54,291 INFO L225 Difference]: With dead ends: 145 [2020-07-21 11:11:54,292 INFO L226 Difference]: Without dead ends: 89 [2020-07-21 11:11:54,294 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2020-07-21 11:11:54,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2020-07-21 11:11:54,307 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 89. [2020-07-21 11:11:54,308 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-07-21 11:11:54,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 112 transitions. [2020-07-21 11:11:54,310 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 112 transitions. Word has length 44 [2020-07-21 11:11:54,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:11:54,311 INFO L479 AbstractCegarLoop]: Abstraction has 89 states and 112 transitions. [2020-07-21 11:11:54,311 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-07-21 11:11:54,311 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 112 transitions. [2020-07-21 11:11:54,314 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-07-21 11:11:54,314 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:11:54,314 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:11:54,527 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:11:54,528 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:11:54,529 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:11:54,529 INFO L82 PathProgramCache]: Analyzing trace with hash 800610240, now seen corresponding path program 1 times [2020-07-21 11:11:54,530 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:11:54,530 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [618618337] [2020-07-21 11:11:54,531 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:11:54,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:11:54,625 INFO L263 TraceCheckSpWp]: Trace formula consists of 256 conjuncts, 25 conjunts are in the unsatisfiable core [2020-07-21 11:11:54,631 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:11:54,750 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-21 11:11:54,751 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:11:54,929 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-21 11:11:54,929 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [618618337] [2020-07-21 11:11:54,930 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:11:54,930 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2020-07-21 11:11:54,930 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [701189068] [2020-07-21 11:11:54,931 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 11:11:54,931 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:11:54,932 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 11:11:54,932 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2020-07-21 11:11:54,932 INFO L87 Difference]: Start difference. First operand 89 states and 112 transitions. Second operand 9 states. [2020-07-21 11:11:55,073 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:11:55,074 INFO L93 Difference]: Finished difference Result 158 states and 200 transitions. [2020-07-21 11:11:55,074 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 11:11:55,075 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 56 [2020-07-21 11:11:55,075 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:11:55,077 INFO L225 Difference]: With dead ends: 158 [2020-07-21 11:11:55,078 INFO L226 Difference]: Without dead ends: 91 [2020-07-21 11:11:55,079 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 104 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2020-07-21 11:11:55,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2020-07-21 11:11:55,091 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2020-07-21 11:11:55,091 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-07-21 11:11:55,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 115 transitions. [2020-07-21 11:11:55,094 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 115 transitions. Word has length 56 [2020-07-21 11:11:55,094 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:11:55,095 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 115 transitions. [2020-07-21 11:11:55,095 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 11:11:55,095 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 115 transitions. [2020-07-21 11:11:55,097 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-07-21 11:11:55,097 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:11:55,098 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:11:55,312 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:11:55,313 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:11:55,313 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:11:55,313 INFO L82 PathProgramCache]: Analyzing trace with hash 487198237, now seen corresponding path program 1 times [2020-07-21 11:11:55,314 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:11:55,314 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [846060419] [2020-07-21 11:11:55,315 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:11:55,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:11:55,444 INFO L263 TraceCheckSpWp]: Trace formula consists of 322 conjuncts, 27 conjunts are in the unsatisfiable core [2020-07-21 11:11:55,449 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:11:55,602 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-07-21 11:11:55,603 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:11:55,798 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-07-21 11:11:55,798 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [846060419] [2020-07-21 11:11:55,798 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:11:55,799 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 14 [2020-07-21 11:11:55,799 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [612924501] [2020-07-21 11:11:55,800 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 11:11:55,800 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:11:55,800 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 11:11:55,801 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=152, Unknown=0, NotChecked=0, Total=182 [2020-07-21 11:11:55,801 INFO L87 Difference]: Start difference. First operand 91 states and 115 transitions. Second operand 14 states. [2020-07-21 11:11:56,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:11:56,155 INFO L93 Difference]: Finished difference Result 157 states and 199 transitions. [2020-07-21 11:11:56,156 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 11:11:56,156 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 66 [2020-07-21 11:11:56,156 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:11:56,158 INFO L225 Difference]: With dead ends: 157 [2020-07-21 11:11:56,159 INFO L226 Difference]: Without dead ends: 93 [2020-07-21 11:11:56,160 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 120 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=54, Invalid=288, Unknown=0, NotChecked=0, Total=342 [2020-07-21 11:11:56,161 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-07-21 11:11:56,171 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 93. [2020-07-21 11:11:56,172 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-07-21 11:11:56,173 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 118 transitions. [2020-07-21 11:11:56,173 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 118 transitions. Word has length 66 [2020-07-21 11:11:56,174 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:11:56,174 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 118 transitions. [2020-07-21 11:11:56,174 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 11:11:56,174 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 118 transitions. [2020-07-21 11:11:56,176 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2020-07-21 11:11:56,176 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:11:56,176 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:11:56,390 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:11:56,391 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:11:56,391 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:11:56,392 INFO L82 PathProgramCache]: Analyzing trace with hash -505239167, now seen corresponding path program 1 times [2020-07-21 11:11:56,392 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:11:56,392 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2029578459] [2020-07-21 11:11:56,392 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:11:56,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:11:56,491 INFO L263 TraceCheckSpWp]: Trace formula consists of 374 conjuncts, 39 conjunts are in the unsatisfiable core [2020-07-21 11:11:56,495 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:11:56,654 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2020-07-21 11:11:56,654 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:11:56,855 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 11:11:57,006 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2020-07-21 11:11:57,007 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2029578459] [2020-07-21 11:11:57,007 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:11:57,007 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 18 [2020-07-21 11:11:57,008 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1694677130] [2020-07-21 11:11:57,009 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 11:11:57,009 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:11:57,009 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 11:11:57,010 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=264, Unknown=0, NotChecked=0, Total=306 [2020-07-21 11:11:57,010 INFO L87 Difference]: Start difference. First operand 93 states and 118 transitions. Second operand 18 states. [2020-07-21 11:11:57,447 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:11:57,448 INFO L93 Difference]: Finished difference Result 149 states and 191 transitions. [2020-07-21 11:11:57,448 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 11:11:57,448 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 79 [2020-07-21 11:11:57,449 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:11:57,453 INFO L225 Difference]: With dead ends: 149 [2020-07-21 11:11:57,453 INFO L226 Difference]: Without dead ends: 97 [2020-07-21 11:11:57,455 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 142 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=71, Invalid=435, Unknown=0, NotChecked=0, Total=506 [2020-07-21 11:11:57,458 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2020-07-21 11:11:57,469 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 97. [2020-07-21 11:11:57,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2020-07-21 11:11:57,471 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 122 transitions. [2020-07-21 11:11:57,471 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 122 transitions. Word has length 79 [2020-07-21 11:11:57,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:11:57,472 INFO L479 AbstractCegarLoop]: Abstraction has 97 states and 122 transitions. [2020-07-21 11:11:57,472 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 11:11:57,472 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 122 transitions. [2020-07-21 11:11:57,474 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2020-07-21 11:11:57,474 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:11:57,474 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:11:57,686 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:11:57,687 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:11:57,687 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:11:57,688 INFO L82 PathProgramCache]: Analyzing trace with hash -1062270604, now seen corresponding path program 1 times [2020-07-21 11:11:57,688 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:11:57,689 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1244773841] [2020-07-21 11:11:57,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:11:57,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-21 11:11:57,847 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 11:11:57,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-21 11:11:57,919 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 11:11:58,004 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-21 11:11:58,005 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-21 11:11:58,223 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:11:58,296 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 11:11:58 BoogieIcfgContainer [2020-07-21 11:11:58,296 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 11:11:58,300 INFO L168 Benchmark]: Toolchain (without parser) took 6289.28 ms. Allocated memory was 136.3 MB in the beginning and 280.0 MB in the end (delta: 143.7 MB). Free memory was 100.1 MB in the beginning and 212.7 MB in the end (delta: -112.6 MB). Peak memory consumption was 31.1 MB. Max. memory is 7.1 GB. [2020-07-21 11:11:58,301 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 136.3 MB. Free memory was 119.4 MB in the beginning and 119.2 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-07-21 11:11:58,302 INFO L168 Benchmark]: CACSL2BoogieTranslator took 557.76 ms. Allocated memory was 136.3 MB in the beginning and 203.4 MB in the end (delta: 67.1 MB). Free memory was 99.9 MB in the beginning and 179.4 MB in the end (delta: -79.5 MB). Peak memory consumption was 23.2 MB. Max. memory is 7.1 GB. [2020-07-21 11:11:58,303 INFO L168 Benchmark]: Boogie Preprocessor took 65.88 ms. Allocated memory is still 203.4 MB. Free memory was 179.4 MB in the beginning and 177.4 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 7.1 GB. [2020-07-21 11:11:58,303 INFO L168 Benchmark]: RCFGBuilder took 641.74 ms. Allocated memory is still 203.4 MB. Free memory was 177.4 MB in the beginning and 143.8 MB in the end (delta: 33.6 MB). Peak memory consumption was 33.6 MB. Max. memory is 7.1 GB. [2020-07-21 11:11:58,304 INFO L168 Benchmark]: TraceAbstraction took 5013.90 ms. Allocated memory was 203.4 MB in the beginning and 280.0 MB in the end (delta: 76.5 MB). Free memory was 143.1 MB in the beginning and 212.7 MB in the end (delta: -69.6 MB). Peak memory consumption was 6.9 MB. Max. memory is 7.1 GB. [2020-07-21 11:11:58,309 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 136.3 MB. Free memory was 119.4 MB in the beginning and 119.2 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 557.76 ms. Allocated memory was 136.3 MB in the beginning and 203.4 MB in the end (delta: 67.1 MB). Free memory was 99.9 MB in the beginning and 179.4 MB in the end (delta: -79.5 MB). Peak memory consumption was 23.2 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 65.88 ms. Allocated memory is still 203.4 MB. Free memory was 179.4 MB in the beginning and 177.4 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 7.1 GB. * RCFGBuilder took 641.74 ms. Allocated memory is still 203.4 MB. Free memory was 177.4 MB in the beginning and 143.8 MB in the end (delta: 33.6 MB). Peak memory consumption was 33.6 MB. Max. memory is 7.1 GB. * TraceAbstraction took 5013.90 ms. Allocated memory was 203.4 MB in the beginning and 280.0 MB in the end (delta: 76.5 MB). Free memory was 143.1 MB in the beginning and 212.7 MB in the end (delta: -69.6 MB). Peak memory consumption was 6.9 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 14]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L96] 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}] [L96] RET, EXPR nondet_tree() VAL [nondet_tree()={-2:0}] [L96] CALL task(nondet_tree()) VAL [t={-2:0}] [L74] CALL, EXPR min(t) VAL [n={-2:0}] [L35] COND FALSE !(!n) [L38] EXPR n->left VAL [n={-2:0}, n={-2:0}, n->left={0:0}] [L38] 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}] [L38] RET, EXPR min(n->left) VAL [min(n->left)=2147483647, n={-2:0}, n={-2:0}, n->left={0:0}] [L38] int a = min(n->left); [L39] EXPR n->right VAL [a=2147483647, n={-2:0}, n={-2:0}, n->right={0:0}] [L39] 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}] [L39] RET, EXPR min(n->right) VAL [a=2147483647, min(n->right)=2147483647, n={-2:0}, n={-2:0}, n->right={0:0}] [L39] int b = min(n->right); [L40] COND TRUE a <= b [L40] return a; VAL [\result=2147483647, a=2147483647, b=2147483647, n={-2:0}, n={-2:0}] [L74] RET, EXPR min(t) VAL [min(t)=2147483647, t={-2:0}, t={-2:0}] [L74] int a = min(t); [L75] int b; VAL [a=2147483647, b={2:0}, t={-2:0}, t={-2:0}] [L77] CALL, EXPR size(t) VAL [t={-2:0}] [L69] COND FALSE !(!t) [L70] EXPR t->left VAL [t={-2:0}, t={-2:0}, t->left={0:0}] [L70] CALL, EXPR size(t->left) VAL [t={0:0}] [L69] COND TRUE !t [L69] return 0; VAL [\result=0, t={0:0}, t={0:0}] [L70] RET, EXPR size(t->left) VAL [size(t->left)=0, t={-2:0}, t={-2:0}, t->left={0:0}] [L70] EXPR t->right VAL [size(t->left)=0, t={-2:0}, t={-2:0}, t->left={0:0}, t->right={0:0}] [L70] CALL, EXPR size(t->right) VAL [t={0:0}] [L69] COND TRUE !t [L69] return 0; VAL [\result=0, t={0:0}, t={0:0}] [L70] 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}] [L70] return size(t->left) + size(t->right) + 1; [L77] RET, EXPR size(t) VAL [a=2147483647, b={2:0}, size(t)=1, t={-2:0}, t={-2:0}] [L77] int n = size(t); [L78] CALL assume_abort_if_not(n != 0) VAL [\old(cond)=1] [L10] COND FALSE !(!cond) VAL [\old(cond)=1, cond=1] [L78] RET assume_abort_if_not(n != 0) VAL [a=2147483647, b={2:0}, n=1, t={-2:0}, t={-2:0}] [L79] 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}] [L79] 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}] [L80] CALL tree_inorder(t, x, n) VAL [\old(i)=1, a={-3:0}, t={-2:0}] [L58] COND FALSE !(!t) [L61] 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}] [L61] CALL, EXPR tree_inorder(t->left, a, i) VAL [\old(i)=1, a={-3:0}, t={0:0}] [L58] COND TRUE !t [L59] return i; VAL [\old(i)=1, \result=1, a={-3:0}, a={-3:0}, i=1, t={0:0}, t={0:0}] [L61] 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] [L61] i = tree_inorder(t->left, a, i) [L62] EXPR i++ [L62] EXPR t->data [L62] a[i++] = t->data [L63] 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}] [L63] CALL, EXPR tree_inorder(t->right, a, i) VAL [\old(i)=2, a={-3:0}, t={0:0}] [L58] COND TRUE !t [L59] return i; VAL [\old(i)=2, \result=2, a={-3:0}, a={-3:0}, i=2, t={0:0}, t={0:0}] [L63] 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] [L63] i = tree_inorder(t->right, a, i) [L64] return i; VAL [\old(i)=1, \result=2, a={-3:0}, a={-3:0}, i=2, t={-2:0}, t={-2:0}] [L80] 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}] [L81] 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] [L81] 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, 95 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 4.8s, OverallIterations: 6, TraceHistogramMax: 3, AutomataDifference: 1.1s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 514 SDtfs, 126 SDslu, 3112 SDs, 0 SdLazy, 653 SolverSat, 87 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.5s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 503 GetRequests, 447 SyntacticMatches, 3 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 0.7s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=97occurred in iteration=5, 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, 5 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.3s SatisfiabilityAnalysisTime, 1.3s InterpolantComputationTime, 380 NumberOfCodeBlocks, 380 NumberOfCodeBlocksAsserted, 6 NumberOfCheckSat, 482 ConstructedInterpolants, 0 QuantifiedInterpolants, 74141 SizeOfPredicates, 28 NumberOfNonLiveVariables, 1370 ConjunctsInSsa, 103 ConjunctsInUnsatCore, 8 InterpolantComputations, 2 PerfectInterpolantSequences, 120/132 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...