./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/verifythis/tree_del_rec_incorrect.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version e19ca921 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerReach.xml -i ../sv-benchmarks/c/verifythis/tree_del_rec_incorrect.c -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 5a7a61549e909154c33d5cf68876338c8745b83dde5aedff258c17f34600afc7 --- Real Ultimate output --- This is Ultimate 0.2.2-dev-e19ca92 [2021-12-22 11:42:25,338 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-12-22 11:42:25,340 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-12-22 11:42:25,377 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-12-22 11:42:25,378 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-12-22 11:42:25,381 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-12-22 11:42:25,382 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-12-22 11:42:25,384 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-12-22 11:42:25,386 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-12-22 11:42:25,390 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-12-22 11:42:25,390 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-12-22 11:42:25,391 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-12-22 11:42:25,392 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-12-22 11:42:25,393 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-12-22 11:42:25,394 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-12-22 11:42:25,397 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-12-22 11:42:25,398 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-12-22 11:42:25,398 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-12-22 11:42:25,400 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-12-22 11:42:25,404 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-12-22 11:42:25,405 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-12-22 11:42:25,406 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-12-22 11:42:25,407 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-12-22 11:42:25,407 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-12-22 11:42:25,410 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-12-22 11:42:25,411 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-12-22 11:42:25,411 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-12-22 11:42:25,412 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-12-22 11:42:25,412 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-12-22 11:42:25,413 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-12-22 11:42:25,413 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-12-22 11:42:25,413 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-12-22 11:42:25,415 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-12-22 11:42:25,415 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-12-22 11:42:25,416 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-12-22 11:42:25,416 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-12-22 11:42:25,417 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-12-22 11:42:25,417 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-12-22 11:42:25,417 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-12-22 11:42:25,418 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-12-22 11:42:25,418 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-12-22 11:42:25,419 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-12-22 11:42:25,454 INFO L113 SettingsManager]: Loading preferences was successful [2021-12-22 11:42:25,454 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-12-22 11:42:25,454 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-12-22 11:42:25,454 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-12-22 11:42:25,455 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-12-22 11:42:25,455 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-12-22 11:42:25,456 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-12-22 11:42:25,456 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-12-22 11:42:25,456 INFO L138 SettingsManager]: * Use SBE=true [2021-12-22 11:42:25,456 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-12-22 11:42:25,457 INFO L138 SettingsManager]: * sizeof long=4 [2021-12-22 11:42:25,457 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-12-22 11:42:25,457 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-12-22 11:42:25,457 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-12-22 11:42:25,466 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-12-22 11:42:25,466 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-12-22 11:42:25,466 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-12-22 11:42:25,466 INFO L138 SettingsManager]: * sizeof long double=12 [2021-12-22 11:42:25,466 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-12-22 11:42:25,466 INFO L138 SettingsManager]: * Use constant arrays=true [2021-12-22 11:42:25,467 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-12-22 11:42:25,467 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-12-22 11:42:25,467 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-12-22 11:42:25,467 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-12-22 11:42:25,467 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-22 11:42:25,467 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-12-22 11:42:25,468 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-12-22 11:42:25,468 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-12-22 11:42:25,468 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-12-22 11:42:25,468 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-12-22 11:42:25,468 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-12-22 11:42:25,468 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2021-12-22 11:42:25,468 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-12-22 11:42:25,469 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-12-22 11:42:25,469 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 5a7a61549e909154c33d5cf68876338c8745b83dde5aedff258c17f34600afc7 [2021-12-22 11:42:25,666 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-12-22 11:42:25,692 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-12-22 11:42:25,694 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-12-22 11:42:25,694 INFO L271 PluginConnector]: Initializing CDTParser... [2021-12-22 11:42:25,695 INFO L275 PluginConnector]: CDTParser initialized [2021-12-22 11:42:25,696 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/verifythis/tree_del_rec_incorrect.c [2021-12-22 11:42:25,744 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9f9651e70/fc96e6dc3370462d8b1a0858b583eb40/FLAGf5673d377 [2021-12-22 11:42:26,148 INFO L306 CDTParser]: Found 1 translation units. [2021-12-22 11:42:26,149 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/verifythis/tree_del_rec_incorrect.c [2021-12-22 11:42:26,153 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9f9651e70/fc96e6dc3370462d8b1a0858b583eb40/FLAGf5673d377 [2021-12-22 11:42:26,164 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9f9651e70/fc96e6dc3370462d8b1a0858b583eb40 [2021-12-22 11:42:26,166 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-12-22 11:42:26,167 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-12-22 11:42:26,167 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-12-22 11:42:26,167 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-12-22 11:42:26,170 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-12-22 11:42:26,170 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.12 11:42:26" (1/1) ... [2021-12-22 11:42:26,171 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2e044b83 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 11:42:26, skipping insertion in model container [2021-12-22 11:42:26,171 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.12 11:42:26" (1/1) ... [2021-12-22 11:42:26,175 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-12-22 11:42:26,188 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-12-22 11:42:26,293 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/verifythis/tree_del_rec_incorrect.c[618,631] [2021-12-22 11:42:26,301 WARN L1533 CHandler]: Possible shadowing of function min [2021-12-22 11:42:26,303 WARN L1533 CHandler]: Possible shadowing of function min [2021-12-22 11:42:26,314 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-22 11:42:26,323 INFO L203 MainTranslator]: Completed pre-run [2021-12-22 11:42:26,331 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/verifythis/tree_del_rec_incorrect.c[618,631] [2021-12-22 11:42:26,338 WARN L1533 CHandler]: Possible shadowing of function min [2021-12-22 11:42:26,339 WARN L1533 CHandler]: Possible shadowing of function min [2021-12-22 11:42:26,345 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-12-22 11:42:26,358 INFO L208 MainTranslator]: Completed translation [2021-12-22 11:42:26,358 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 11:42:26 WrapperNode [2021-12-22 11:42:26,359 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-12-22 11:42:26,360 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-12-22 11:42:26,360 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-12-22 11:42:26,360 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-12-22 11:42:26,364 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 11:42:26" (1/1) ... [2021-12-22 11:42:26,381 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 11:42:26" (1/1) ... [2021-12-22 11:42:26,402 INFO L137 Inliner]: procedures = 29, calls = 58, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 69 [2021-12-22 11:42:26,402 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-12-22 11:42:26,403 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-12-22 11:42:26,404 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-12-22 11:42:26,404 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-12-22 11:42:26,409 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 11:42:26" (1/1) ... [2021-12-22 11:42:26,409 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 11:42:26" (1/1) ... [2021-12-22 11:42:26,423 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 11:42:26" (1/1) ... [2021-12-22 11:42:26,423 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 11:42:26" (1/1) ... [2021-12-22 11:42:26,433 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 11:42:26" (1/1) ... [2021-12-22 11:42:26,441 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 11:42:26" (1/1) ... [2021-12-22 11:42:26,442 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 11:42:26" (1/1) ... [2021-12-22 11:42:26,447 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-12-22 11:42:26,450 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-12-22 11:42:26,451 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-12-22 11:42:26,451 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-12-22 11:42:26,452 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 11:42:26" (1/1) ... [2021-12-22 11:42:26,456 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-12-22 11:42:26,464 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 11:42:26,480 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-12-22 11:42:26,493 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-12-22 11:42:26,515 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-12-22 11:42:26,515 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-12-22 11:42:26,515 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-12-22 11:42:26,516 INFO L130 BoogieDeclarations]: Found specification of procedure tree_del [2021-12-22 11:42:26,516 INFO L138 BoogieDeclarations]: Found implementation of procedure tree_del [2021-12-22 11:42:26,516 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-12-22 11:42:26,516 INFO L130 BoogieDeclarations]: Found specification of procedure min [2021-12-22 11:42:26,516 INFO L138 BoogieDeclarations]: Found implementation of procedure min [2021-12-22 11:42:26,517 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-12-22 11:42:26,517 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.meminit [2021-12-22 11:42:26,517 INFO L138 BoogieDeclarations]: Found implementation of procedure #Ultimate.meminit [2021-12-22 11:42:26,517 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-12-22 11:42:26,517 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_tree [2021-12-22 11:42:26,517 INFO L138 BoogieDeclarations]: Found implementation of procedure nondet_tree [2021-12-22 11:42:26,517 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-12-22 11:42:26,518 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-12-22 11:42:26,518 INFO L130 BoogieDeclarations]: Found specification of procedure size [2021-12-22 11:42:26,518 INFO L138 BoogieDeclarations]: Found implementation of procedure size [2021-12-22 11:42:26,518 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-12-22 11:42:26,518 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-12-22 11:42:26,519 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-12-22 11:42:26,519 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-12-22 11:42:26,519 INFO L130 BoogieDeclarations]: Found specification of procedure tree_inorder [2021-12-22 11:42:26,519 INFO L138 BoogieDeclarations]: Found implementation of procedure tree_inorder [2021-12-22 11:42:26,520 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-12-22 11:42:26,636 INFO L234 CfgBuilder]: Building ICFG [2021-12-22 11:42:26,637 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2021-12-22 11:42:26,874 INFO L275 CfgBuilder]: Performing block encoding [2021-12-22 11:42:26,879 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-12-22 11:42:26,879 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-12-22 11:42:26,880 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.12 11:42:26 BoogieIcfgContainer [2021-12-22 11:42:26,880 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-12-22 11:42:26,881 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-12-22 11:42:26,881 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-12-22 11:42:26,886 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-12-22 11:42:26,886 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.12 11:42:26" (1/3) ... [2021-12-22 11:42:26,886 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@47cb7982 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.12 11:42:26, skipping insertion in model container [2021-12-22 11:42:26,887 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 11:42:26" (2/3) ... [2021-12-22 11:42:26,887 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@47cb7982 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.12 11:42:26, skipping insertion in model container [2021-12-22 11:42:26,887 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.12 11:42:26" (3/3) ... [2021-12-22 11:42:26,890 INFO L111 eAbstractionObserver]: Analyzing ICFG tree_del_rec_incorrect.c [2021-12-22 11:42:26,894 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-12-22 11:42:26,894 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-12-22 11:42:26,935 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-12-22 11:42:26,941 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-12-22 11:42:26,941 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-12-22 11:42:26,955 INFO L276 IsEmpty]: Start isEmpty. Operand has 84 states, 53 states have (on average 1.2075471698113207) internal successors, (64), 54 states have internal predecessors, (64), 22 states have call successors, (22), 7 states have call predecessors, (22), 7 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2021-12-22 11:42:26,962 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-12-22 11:42:26,962 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 11:42:26,962 INFO L514 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] [2021-12-22 11:42:26,963 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 11:42:26,967 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 11:42:26,967 INFO L85 PathProgramCache]: Analyzing trace with hash -1201346449, now seen corresponding path program 1 times [2021-12-22 11:42:26,973 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 11:42:26,974 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [657705221] [2021-12-22 11:42:26,974 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 11:42:26,975 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 11:42:27,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 11:42:27,134 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-22 11:42:27,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 11:42:27,147 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-12-22 11:42:27,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 11:42:27,156 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2021-12-22 11:42:27,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 11:42:27,187 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2021-12-22 11:42:27,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 11:42:27,198 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 26 [2021-12-22 11:42:27,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 11:42:27,206 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 11:42:27,207 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 11:42:27,207 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [657705221] [2021-12-22 11:42:27,207 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [657705221] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 11:42:27,208 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 11:42:27,208 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-12-22 11:42:27,209 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1002684125] [2021-12-22 11:42:27,209 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 11:42:27,212 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-12-22 11:42:27,213 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 11:42:27,233 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-12-22 11:42:27,234 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-12-22 11:42:27,236 INFO L87 Difference]: Start difference. First operand has 84 states, 53 states have (on average 1.2075471698113207) internal successors, (64), 54 states have internal predecessors, (64), 22 states have call successors, (22), 7 states have call predecessors, (22), 7 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) Second operand has 5 states, 5 states have (on average 5.0) internal successors, (25), 2 states have internal predecessors, (25), 2 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-12-22 11:42:27,430 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 11:42:27,431 INFO L93 Difference]: Finished difference Result 148 states and 196 transitions. [2021-12-22 11:42:27,432 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-12-22 11:42:27,433 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 5.0) internal successors, (25), 2 states have internal predecessors, (25), 2 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 36 [2021-12-22 11:42:27,433 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 11:42:27,439 INFO L225 Difference]: With dead ends: 148 [2021-12-22 11:42:27,439 INFO L226 Difference]: Without dead ends: 84 [2021-12-22 11:42:27,441 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-12-22 11:42:27,444 INFO L933 BasicCegarLoop]: 89 mSDtfsCounter, 27 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 76 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 137 SdHoareTripleChecker+Invalid, 100 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 76 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-12-22 11:42:27,444 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [31 Valid, 137 Invalid, 100 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 76 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-12-22 11:42:27,454 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2021-12-22 11:42:27,473 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 79. [2021-12-22 11:42:27,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 49 states have (on average 1.1428571428571428) internal successors, (56), 49 states have internal predecessors, (56), 22 states have call successors, (22), 7 states have call predecessors, (22), 7 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2021-12-22 11:42:27,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 100 transitions. [2021-12-22 11:42:27,476 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 100 transitions. Word has length 36 [2021-12-22 11:42:27,477 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 11:42:27,477 INFO L470 AbstractCegarLoop]: Abstraction has 79 states and 100 transitions. [2021-12-22 11:42:27,477 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 5.0) internal successors, (25), 2 states have internal predecessors, (25), 2 states have call successors, (6), 5 states have call predecessors, (6), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-12-22 11:42:27,477 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 100 transitions. [2021-12-22 11:42:27,479 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-12-22 11:42:27,479 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 11:42:27,479 INFO L514 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] [2021-12-22 11:42:27,479 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-12-22 11:42:27,479 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 11:42:27,480 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 11:42:27,480 INFO L85 PathProgramCache]: Analyzing trace with hash 1505272945, now seen corresponding path program 1 times [2021-12-22 11:42:27,480 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 11:42:27,480 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [984991282] [2021-12-22 11:42:27,480 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 11:42:27,480 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 11:42:27,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 11:42:27,571 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-22 11:42:27,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 11:42:27,580 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-12-22 11:42:27,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 11:42:27,583 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2021-12-22 11:42:27,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 11:42:27,606 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2021-12-22 11:42:27,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 11:42:27,618 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 26 [2021-12-22 11:42:27,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 11:42:27,623 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-12-22 11:42:27,629 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 11:42:27,629 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [984991282] [2021-12-22 11:42:27,630 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [984991282] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 11:42:27,630 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 11:42:27,630 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-12-22 11:42:27,630 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1212482353] [2021-12-22 11:42:27,630 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 11:42:27,631 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-12-22 11:42:27,631 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 11:42:27,632 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-12-22 11:42:27,632 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2021-12-22 11:42:27,632 INFO L87 Difference]: Start difference. First operand 79 states and 100 transitions. Second operand has 8 states, 8 states have (on average 3.125) internal successors, (25), 4 states have internal predecessors, (25), 2 states have call successors, (6), 5 states have call predecessors, (6), 2 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) [2021-12-22 11:42:27,816 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 11:42:27,816 INFO L93 Difference]: Finished difference Result 142 states and 184 transitions. [2021-12-22 11:42:27,816 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-12-22 11:42:27,817 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.125) internal successors, (25), 4 states have internal predecessors, (25), 2 states have call successors, (6), 5 states have call predecessors, (6), 2 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) Word has length 36 [2021-12-22 11:42:27,817 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 11:42:27,821 INFO L225 Difference]: With dead ends: 142 [2021-12-22 11:42:27,821 INFO L226 Difference]: Without dead ends: 86 [2021-12-22 11:42:27,825 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2021-12-22 11:42:27,826 INFO L933 BasicCegarLoop]: 83 mSDtfsCounter, 28 mSDsluCounter, 227 mSDsCounter, 0 mSdLazyCounter, 187 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 310 SdHoareTripleChecker+Invalid, 211 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 187 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-22 11:42:27,827 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [34 Valid, 310 Invalid, 211 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 187 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-22 11:42:27,827 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2021-12-22 11:42:27,834 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 81. [2021-12-22 11:42:27,834 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 50 states have (on average 1.14) internal successors, (57), 51 states have internal predecessors, (57), 22 states have call successors, (22), 7 states have call predecessors, (22), 8 states have return successors, (25), 22 states have call predecessors, (25), 22 states have call successors, (25) [2021-12-22 11:42:27,835 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 104 transitions. [2021-12-22 11:42:27,835 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 104 transitions. Word has length 36 [2021-12-22 11:42:27,835 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 11:42:27,836 INFO L470 AbstractCegarLoop]: Abstraction has 81 states and 104 transitions. [2021-12-22 11:42:27,836 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 3.125) internal successors, (25), 4 states have internal predecessors, (25), 2 states have call successors, (6), 5 states have call predecessors, (6), 2 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) [2021-12-22 11:42:27,836 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 104 transitions. [2021-12-22 11:42:27,837 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-12-22 11:42:27,837 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 11:42:27,837 INFO L514 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] [2021-12-22 11:42:27,837 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-12-22 11:42:27,838 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 11:42:27,838 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 11:42:27,838 INFO L85 PathProgramCache]: Analyzing trace with hash 1392403970, now seen corresponding path program 1 times [2021-12-22 11:42:27,838 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 11:42:27,838 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [692079740] [2021-12-22 11:42:27,838 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 11:42:27,839 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 11:42:27,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 11:42:27,891 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-22 11:42:27,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 11:42:27,916 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-12-22 11:42:27,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 11:42:27,926 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2021-12-22 11:42:27,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 11:42:27,968 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-22 11:42:27,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 11:42:27,973 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-12-22 11:42:27,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 11:42:28,001 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2021-12-22 11:42:28,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 11:42:28,014 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 38 [2021-12-22 11:42:28,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 11:42:28,026 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-12-22 11:42:28,028 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 11:42:28,028 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [692079740] [2021-12-22 11:42:28,029 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [692079740] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 11:42:28,029 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1999666791] [2021-12-22 11:42:28,030 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 11:42:28,030 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 11:42:28,030 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 11:42:28,032 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-22 11:42:28,032 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-12-22 11:42:28,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 11:42:28,120 INFO L263 TraceCheckSpWp]: Trace formula consists of 245 conjuncts, 25 conjunts are in the unsatisfiable core [2021-12-22 11:42:28,124 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 11:42:28,317 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-12-22 11:42:28,317 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-12-22 11:42:28,533 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-12-22 11:42:28,534 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1999666791] provided 0 perfect and 2 imperfect interpolant sequences [2021-12-22 11:42:28,534 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-12-22 11:42:28,534 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 7, 7] total 11 [2021-12-22 11:42:28,534 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [473522934] [2021-12-22 11:42:28,534 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-12-22 11:42:28,534 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-12-22 11:42:28,535 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 11:42:28,535 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-12-22 11:42:28,535 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=86, Unknown=0, NotChecked=0, Total=110 [2021-12-22 11:42:28,535 INFO L87 Difference]: Start difference. First operand 81 states and 104 transitions. Second operand has 11 states, 11 states have (on average 3.6363636363636362) internal successors, (40), 7 states have internal predecessors, (40), 4 states have call successors, (13), 5 states have call predecessors, (13), 4 states have return successors, (9), 4 states have call predecessors, (9), 4 states have call successors, (9) [2021-12-22 11:42:28,837 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 11:42:28,838 INFO L93 Difference]: Finished difference Result 148 states and 193 transitions. [2021-12-22 11:42:28,838 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-12-22 11:42:28,838 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 3.6363636363636362) internal successors, (40), 7 states have internal predecessors, (40), 4 states have call successors, (13), 5 states have call predecessors, (13), 4 states have return successors, (9), 4 states have call predecessors, (9), 4 states have call successors, (9) Word has length 48 [2021-12-22 11:42:28,839 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 11:42:28,839 INFO L225 Difference]: With dead ends: 148 [2021-12-22 11:42:28,840 INFO L226 Difference]: Without dead ends: 86 [2021-12-22 11:42:28,840 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 102 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=50, Invalid=160, Unknown=0, NotChecked=0, Total=210 [2021-12-22 11:42:28,841 INFO L933 BasicCegarLoop]: 82 mSDtfsCounter, 34 mSDsluCounter, 398 mSDsCounter, 0 mSdLazyCounter, 324 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 480 SdHoareTripleChecker+Invalid, 355 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 324 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-22 11:42:28,841 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [36 Valid, 480 Invalid, 355 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 324 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-22 11:42:28,842 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2021-12-22 11:42:28,847 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 83. [2021-12-22 11:42:28,848 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 51 states have (on average 1.1372549019607843) internal successors, (58), 53 states have internal predecessors, (58), 22 states have call successors, (22), 7 states have call predecessors, (22), 9 states have return successors, (27), 22 states have call predecessors, (27), 22 states have call successors, (27) [2021-12-22 11:42:28,849 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 107 transitions. [2021-12-22 11:42:28,849 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 107 transitions. Word has length 48 [2021-12-22 11:42:28,849 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 11:42:28,849 INFO L470 AbstractCegarLoop]: Abstraction has 83 states and 107 transitions. [2021-12-22 11:42:28,849 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 3.6363636363636362) internal successors, (40), 7 states have internal predecessors, (40), 4 states have call successors, (13), 5 states have call predecessors, (13), 4 states have return successors, (9), 4 states have call predecessors, (9), 4 states have call successors, (9) [2021-12-22 11:42:28,850 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 107 transitions. [2021-12-22 11:42:28,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-12-22 11:42:28,851 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 11:42:28,851 INFO L514 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] [2021-12-22 11:42:28,870 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-12-22 11:42:29,067 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 11:42:29,068 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 11:42:29,068 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 11:42:29,068 INFO L85 PathProgramCache]: Analyzing trace with hash 164705413, now seen corresponding path program 1 times [2021-12-22 11:42:29,068 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 11:42:29,068 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1528132643] [2021-12-22 11:42:29,068 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 11:42:29,069 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 11:42:29,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 11:42:29,110 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-22 11:42:29,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 11:42:29,158 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-12-22 11:42:29,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 11:42:29,170 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-12-22 11:42:29,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 11:42:29,174 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-12-22 11:42:29,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 11:42:29,187 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-12-22 11:42:29,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 11:42:29,194 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-22 11:42:29,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 11:42:29,197 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-12-22 11:42:29,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 11:42:29,205 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 43 [2021-12-22 11:42:29,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 11:42:29,216 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 48 [2021-12-22 11:42:29,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 11:42:29,219 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-12-22 11:42:29,219 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 11:42:29,219 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1528132643] [2021-12-22 11:42:29,219 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1528132643] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 11:42:29,220 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-12-22 11:42:29,220 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-12-22 11:42:29,220 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1296606487] [2021-12-22 11:42:29,220 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 11:42:29,220 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-12-22 11:42:29,220 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 11:42:29,221 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-12-22 11:42:29,221 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2021-12-22 11:42:29,221 INFO L87 Difference]: Start difference. First operand 83 states and 107 transitions. Second operand has 11 states, 10 states have (on average 3.2) internal successors, (32), 7 states have internal predecessors, (32), 4 states have call successors, (10), 5 states have call predecessors, (10), 3 states have return successors, (9), 4 states have call predecessors, (9), 4 states have call successors, (9) [2021-12-22 11:42:29,461 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 11:42:29,461 INFO L93 Difference]: Finished difference Result 148 states and 193 transitions. [2021-12-22 11:42:29,462 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-12-22 11:42:29,462 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 3.2) internal successors, (32), 7 states have internal predecessors, (32), 4 states have call successors, (10), 5 states have call predecessors, (10), 3 states have return successors, (9), 4 states have call predecessors, (9), 4 states have call successors, (9) Word has length 58 [2021-12-22 11:42:29,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 11:42:29,463 INFO L225 Difference]: With dead ends: 148 [2021-12-22 11:42:29,463 INFO L226 Difference]: Without dead ends: 88 [2021-12-22 11:42:29,464 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=44, Invalid=166, Unknown=0, NotChecked=0, Total=210 [2021-12-22 11:42:29,464 INFO L933 BasicCegarLoop]: 82 mSDtfsCounter, 71 mSDsluCounter, 380 mSDsCounter, 0 mSdLazyCounter, 332 mSolverCounterSat, 59 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 462 SdHoareTripleChecker+Invalid, 391 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 59 IncrementalHoareTripleChecker+Valid, 332 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-12-22 11:42:29,465 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [73 Valid, 462 Invalid, 391 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [59 Valid, 332 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-12-22 11:42:29,465 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2021-12-22 11:42:29,470 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 85. [2021-12-22 11:42:29,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 52 states have (on average 1.1346153846153846) internal successors, (59), 55 states have internal predecessors, (59), 22 states have call successors, (22), 7 states have call predecessors, (22), 10 states have return successors, (29), 22 states have call predecessors, (29), 22 states have call successors, (29) [2021-12-22 11:42:29,471 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 110 transitions. [2021-12-22 11:42:29,472 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 110 transitions. Word has length 58 [2021-12-22 11:42:29,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 11:42:29,472 INFO L470 AbstractCegarLoop]: Abstraction has 85 states and 110 transitions. [2021-12-22 11:42:29,472 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 3.2) internal successors, (32), 7 states have internal predecessors, (32), 4 states have call successors, (10), 5 states have call predecessors, (10), 3 states have return successors, (9), 4 states have call predecessors, (9), 4 states have call successors, (9) [2021-12-22 11:42:29,472 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 110 transitions. [2021-12-22 11:42:29,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-12-22 11:42:29,474 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 11:42:29,474 INFO L514 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] [2021-12-22 11:42:29,474 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-12-22 11:42:29,474 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 11:42:29,474 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 11:42:29,474 INFO L85 PathProgramCache]: Analyzing trace with hash 159940150, now seen corresponding path program 1 times [2021-12-22 11:42:29,475 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 11:42:29,475 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [418790276] [2021-12-22 11:42:29,475 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 11:42:29,475 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 11:42:29,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 11:42:29,526 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-22 11:42:29,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 11:42:29,558 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-12-22 11:42:29,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 11:42:29,570 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-12-22 11:42:29,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 11:42:29,575 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-12-22 11:42:29,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 11:42:29,631 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-22 11:42:29,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 11:42:29,643 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-12-22 11:42:29,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 11:42:29,648 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 36 [2021-12-22 11:42:29,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 11:42:29,655 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-12-22 11:42:29,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 11:42:29,658 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-12-22 11:42:29,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 11:42:29,666 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 56 [2021-12-22 11:42:29,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 11:42:29,678 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 61 [2021-12-22 11:42:29,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 11:42:29,706 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-12-22 11:42:29,707 INFO L139 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-12-22 11:42:29,707 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [418790276] [2021-12-22 11:42:29,707 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [418790276] provided 0 perfect and 1 imperfect interpolant sequences [2021-12-22 11:42:29,707 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [744971202] [2021-12-22 11:42:29,707 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 11:42:29,707 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 11:42:29,707 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2021-12-22 11:42:29,708 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-12-22 11:42:29,709 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-12-22 11:42:29,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-12-22 11:42:29,800 INFO L263 TraceCheckSpWp]: Trace formula consists of 390 conjuncts, 15 conjunts are in the unsatisfiable core [2021-12-22 11:42:29,805 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-12-22 11:42:29,922 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2021-12-22 11:42:29,922 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-12-22 11:42:29,922 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [744971202] provided 1 perfect and 0 imperfect interpolant sequences [2021-12-22 11:42:29,922 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-12-22 11:42:29,922 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [15] total 18 [2021-12-22 11:42:29,923 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [567454367] [2021-12-22 11:42:29,923 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-12-22 11:42:29,923 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-12-22 11:42:29,923 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-12-22 11:42:29,924 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-12-22 11:42:29,924 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=269, Unknown=0, NotChecked=0, Total=306 [2021-12-22 11:42:29,924 INFO L87 Difference]: Start difference. First operand 85 states and 110 transitions. Second operand has 8 states, 8 states have (on average 4.5) internal successors, (36), 7 states have internal predecessors, (36), 4 states have call successors, (12), 2 states have call predecessors, (12), 3 states have return successors, (11), 5 states have call predecessors, (11), 3 states have call successors, (11) [2021-12-22 11:42:30,004 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-12-22 11:42:30,005 INFO L93 Difference]: Finished difference Result 139 states and 180 transitions. [2021-12-22 11:42:30,005 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-12-22 11:42:30,005 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.5) internal successors, (36), 7 states have internal predecessors, (36), 4 states have call successors, (12), 2 states have call predecessors, (12), 3 states have return successors, (11), 5 states have call predecessors, (11), 3 states have call successors, (11) Word has length 71 [2021-12-22 11:42:30,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-12-22 11:42:30,008 INFO L225 Difference]: With dead ends: 139 [2021-12-22 11:42:30,008 INFO L226 Difference]: Without dead ends: 87 [2021-12-22 11:42:30,009 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 86 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=371, Unknown=0, NotChecked=0, Total=420 [2021-12-22 11:42:30,010 INFO L933 BasicCegarLoop]: 93 mSDtfsCounter, 36 mSDsluCounter, 476 mSDsCounter, 0 mSdLazyCounter, 74 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 569 SdHoareTripleChecker+Invalid, 96 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 74 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-12-22 11:42:30,011 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 569 Invalid, 96 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 74 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-12-22 11:42:30,013 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2021-12-22 11:42:30,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 87. [2021-12-22 11:42:30,022 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 53 states have (on average 1.1320754716981132) internal successors, (60), 57 states have internal predecessors, (60), 22 states have call successors, (22), 7 states have call predecessors, (22), 11 states have return successors, (31), 22 states have call predecessors, (31), 22 states have call successors, (31) [2021-12-22 11:42:30,023 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 113 transitions. [2021-12-22 11:42:30,023 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 113 transitions. Word has length 71 [2021-12-22 11:42:30,023 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-12-22 11:42:30,024 INFO L470 AbstractCegarLoop]: Abstraction has 87 states and 113 transitions. [2021-12-22 11:42:30,024 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 4.5) internal successors, (36), 7 states have internal predecessors, (36), 4 states have call successors, (12), 2 states have call predecessors, (12), 3 states have return successors, (11), 5 states have call predecessors, (11), 3 states have call successors, (11) [2021-12-22 11:42:30,024 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 113 transitions. [2021-12-22 11:42:30,026 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-12-22 11:42:30,026 INFO L506 BasicCegarLoop]: Found error trace [2021-12-22 11:42:30,026 INFO L514 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] [2021-12-22 11:42:30,049 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-12-22 11:42:30,244 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-12-22 11:42:30,244 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-12-22 11:42:30,244 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-12-22 11:42:30,245 INFO L85 PathProgramCache]: Analyzing trace with hash 661772809, now seen corresponding path program 1 times [2021-12-22 11:42:30,245 INFO L121 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-12-22 11:42:30,245 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [768158150] [2021-12-22 11:42:30,245 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-12-22 11:42:30,247 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-12-22 11:42:30,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-12-22 11:42:30,281 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-12-22 11:42:30,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-12-22 11:42:30,332 INFO L133 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-12-22 11:42:30,332 INFO L628 BasicCegarLoop]: Counterexample is feasible [2021-12-22 11:42:30,332 INFO L764 garLoopResultBuilder]: Registering result UNSAFE for location __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2021-12-22 11:42:30,333 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-12-22 11:42:30,338 INFO L732 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1, 1, 1] [2021-12-22 11:42:30,342 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-12-22 11:42:30,386 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.12 11:42:30 BoogieIcfgContainer [2021-12-22 11:42:30,386 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-12-22 11:42:30,387 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-12-22 11:42:30,387 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-12-22 11:42:30,387 INFO L275 PluginConnector]: Witness Printer initialized [2021-12-22 11:42:30,387 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.12 11:42:26" (3/4) ... [2021-12-22 11:42:30,390 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2021-12-22 11:42:30,434 INFO L141 WitnessManager]: Wrote witness to /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/witness.graphml [2021-12-22 11:42:30,436 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-12-22 11:42:30,436 INFO L158 Benchmark]: Toolchain (without parser) took 4269.90ms. Allocated memory was 117.4MB in the beginning and 142.6MB in the end (delta: 25.2MB). Free memory was 92.2MB in the beginning and 61.0MB in the end (delta: 31.2MB). Peak memory consumption was 58.2MB. Max. memory is 16.1GB. [2021-12-22 11:42:30,437 INFO L158 Benchmark]: CDTParser took 0.14ms. Allocated memory is still 83.9MB. Free memory is still 59.1MB. There was no memory consumed. Max. memory is 16.1GB. [2021-12-22 11:42:30,437 INFO L158 Benchmark]: CACSL2BoogieTranslator took 191.48ms. Allocated memory is still 117.4MB. Free memory was 92.0MB in the beginning and 80.5MB in the end (delta: 11.5MB). Peak memory consumption was 12.6MB. Max. memory is 16.1GB. [2021-12-22 11:42:30,437 INFO L158 Benchmark]: Boogie Procedure Inliner took 42.88ms. Allocated memory is still 117.4MB. Free memory was 80.3MB in the beginning and 78.7MB in the end (delta: 1.6MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-12-22 11:42:30,437 INFO L158 Benchmark]: Boogie Preprocessor took 46.35ms. Allocated memory is still 117.4MB. Free memory was 78.7MB in the beginning and 76.9MB in the end (delta: 1.8MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-12-22 11:42:30,438 INFO L158 Benchmark]: RCFGBuilder took 430.55ms. Allocated memory is still 117.4MB. Free memory was 76.9MB in the beginning and 94.2MB in the end (delta: -17.2MB). Peak memory consumption was 21.0MB. Max. memory is 16.1GB. [2021-12-22 11:42:30,438 INFO L158 Benchmark]: TraceAbstraction took 3505.07ms. Allocated memory was 117.4MB in the beginning and 142.6MB in the end (delta: 25.2MB). Free memory was 93.7MB in the beginning and 65.2MB in the end (delta: 28.5MB). Peak memory consumption was 53.0MB. Max. memory is 16.1GB. [2021-12-22 11:42:30,438 INFO L158 Benchmark]: Witness Printer took 49.36ms. Allocated memory is still 142.6MB. Free memory was 65.2MB in the beginning and 61.0MB in the end (delta: 4.2MB). Peak memory consumption was 4.2MB. Max. memory is 16.1GB. [2021-12-22 11:42:30,439 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.14ms. Allocated memory is still 83.9MB. Free memory is still 59.1MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 191.48ms. Allocated memory is still 117.4MB. Free memory was 92.0MB in the beginning and 80.5MB in the end (delta: 11.5MB). Peak memory consumption was 12.6MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 42.88ms. Allocated memory is still 117.4MB. Free memory was 80.3MB in the beginning and 78.7MB in the end (delta: 1.6MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 46.35ms. Allocated memory is still 117.4MB. Free memory was 78.7MB in the beginning and 76.9MB in the end (delta: 1.8MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * RCFGBuilder took 430.55ms. Allocated memory is still 117.4MB. Free memory was 76.9MB in the beginning and 94.2MB in the end (delta: -17.2MB). Peak memory consumption was 21.0MB. Max. memory is 16.1GB. * TraceAbstraction took 3505.07ms. Allocated memory was 117.4MB in the beginning and 142.6MB in the end (delta: 25.2MB). Free memory was 93.7MB in the beginning and 65.2MB in the end (delta: 28.5MB). Peak memory consumption was 53.0MB. Max. memory is 16.1GB. * Witness Printer took 49.36ms. Allocated memory is still 142.6MB. Free memory was 65.2MB in the beginning and 61.0MB in the end (delta: 4.2MB). Peak memory consumption was 4.2MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - CounterExampleResult [Line: 16]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L98] CALL, EXPR nondet_tree() [L25] COND FALSE !(__VERIFIER_nondet_bool()) [L28] struct node *n = (struct node *)malloc(sizeof(struct node)); [L29] n->data = __VERIFIER_nondet_int() [L30] CALL, EXPR nondet_tree() [L25] COND TRUE __VERIFIER_nondet_bool() [L26] return 0; VAL [\result={0:0}] [L30] RET, EXPR nondet_tree() VAL [n={-2:0}, nondet_tree()={0:0}] [L30] n->left = nondet_tree() [L31] CALL, EXPR nondet_tree() [L25] COND TRUE __VERIFIER_nondet_bool() [L26] return 0; VAL [\result={0:0}] [L31] RET, EXPR nondet_tree() VAL [n={-2:0}, nondet_tree()={0:0}] [L31] n->right = nondet_tree() [L32] return n; VAL [\result={-2:0}, n={-2:0}] [L98] RET, EXPR nondet_tree() VAL [nondet_tree()={-2:0}] [L98] CALL task(nondet_tree()) [L76] CALL, EXPR min(t) VAL [n={-2:0}] [L37] COND FALSE !(!n) [L40] EXPR n->left VAL [n={-2:0}, n={-2:0}, n->left={0:0}] [L40] CALL, EXPR min(n->left) VAL [n={0:0}] [L37] COND TRUE !n [L38] return 2147483647; VAL [\result=2147483647, n={0:0}, n={0:0}] [L40] RET, EXPR min(n->left) VAL [min(n->left)=2147483647, n={-2:0}, n={-2:0}, n->left={0:0}] [L40] int a = min(n->left); [L41] EXPR n->right VAL [a=2147483647, n={-2:0}, n={-2:0}, n->right={0:0}] [L41] CALL, EXPR min(n->right) VAL [n={0:0}] [L37] COND TRUE !n [L38] return 2147483647; VAL [\result=2147483647, n={0:0}, n={0:0}] [L41] RET, EXPR min(n->right) VAL [a=2147483647, min(n->right)=2147483647, n={-2:0}, n={-2:0}, n->right={0:0}] [L41] int b = min(n->right); [L42] COND TRUE a <= b [L42] return a; VAL [\result=2147483647, a=2147483647, b=2147483647, n={-2:0}, n={-2:0}] [L76] RET, EXPR min(t) VAL [min(t)=2147483647, t={-2:0}, t={-2:0}] [L76] int a = min(t); [L77] int b; VAL [a=2147483647, b={5:0}, t={-2:0}, t={-2:0}] [L79] CALL, EXPR size(t) VAL [t={-2:0}] [L71] COND FALSE !(!t) [L72] EXPR t->left VAL [t={-2:0}, t={-2:0}, t->left={0:0}] [L72] CALL, EXPR size(t->left) VAL [t={0:0}] [L71] COND TRUE !t [L71] return 0; VAL [\result=0, t={0:0}, t={0:0}] [L72] RET, EXPR size(t->left) VAL [size(t->left)=0, t={-2:0}, t={-2:0}, t->left={0:0}] [L72] EXPR t->right VAL [size(t->left)=0, t={-2:0}, t={-2:0}, t->left={0:0}, t->right={0:0}] [L72] CALL, EXPR size(t->right) VAL [t={0:0}] [L71] COND TRUE !t [L71] return 0; VAL [\result=0, t={0:0}, t={0:0}] [L72] RET, EXPR size(t->right) VAL [size(t->left)=0, size(t->right)=0, t={-2:0}, t={-2:0}, t->left={0:0}, t->right={0:0}] [L72] return size(t->left) + size(t->right) + 1; [L79] RET, EXPR size(t) VAL [a=2147483647, b={5:0}, size(t)=1, t={-2:0}, t={-2:0}] [L79] int n = size(t); [L80] CALL assume_abort_if_not(n != 0) [L10] COND FALSE !(!cond) VAL [\old(cond)=1, cond=1] [L80] RET assume_abort_if_not(n != 0) [L81] EXPR, FCALL calloc(n, sizeof(int)) VAL [a=2147483647, b={5:0}, calloc(n, sizeof(int))={-3:0}, n=1, t={-2:0}, t={-2:0}] [L81] int *x = calloc(n, sizeof(int)); VAL [a=2147483647, b={5:0}, calloc(n, sizeof(int))={-3:0}, n=1, t={-2:0}, t={-2:0}, x={-3:0}] [L82] CALL tree_inorder(t, x, n) VAL [\old(i)=1, a={-3:0}, t={-2:0}] [L60] COND FALSE !(!t) [L63] EXPR t->left VAL [\old(i)=1, a={-3:0}, a={-3:0}, i=1, t={-2:0}, t={-2:0}, t->left={0:0}] [L63] CALL, EXPR tree_inorder(t->left, a, i) VAL [\old(i)=1, a={-3:0}, t={0:0}] [L60] COND TRUE !t [L61] return i; VAL [\old(i)=1, \result=1, a={-3:0}, a={-3:0}, i=1, t={0:0}, t={0:0}] [L63] RET, EXPR tree_inorder(t->left, a, i) VAL [\old(i)=1, a={-3:0}, a={-3:0}, i=1, t={-2:0}, t={-2:0}, t->left={0:0}, tree_inorder(t->left, a, i)=1] [L63] i = tree_inorder(t->left, a, i) [L64] EXPR i++ [L64] EXPR t->data [L64] a[i++] = t->data [L65] EXPR t->right VAL [\old(i)=1, a={-3:0}, a={-3:0}, i=2, t={-2:0}, t={-2:0}, t->right={0:0}] [L65] CALL, EXPR tree_inorder(t->right, a, i) VAL [\old(i)=2, a={-3:0}, t={0:0}] [L60] COND TRUE !t [L61] return i; VAL [\old(i)=2, \result=2, a={-3:0}, a={-3:0}, i=2, t={0:0}, t={0:0}] [L65] RET, EXPR tree_inorder(t->right, a, i) VAL [\old(i)=1, a={-3:0}, a={-3:0}, i=2, t={-2:0}, t={-2:0}, t->right={0:0}, tree_inorder(t->right, a, i)=2] [L65] i = tree_inorder(t->right, a, i) [L66] return i; VAL [\old(i)=1, \result=2, a={-3:0}, a={-3:0}, i=2, t={-2:0}, t={-2:0}] [L82] RET tree_inorder(t, x, n) VAL [a=2147483647, b={5:0}, calloc(n, sizeof(int))={-3:0}, n=1, t={-2:0}, t={-2:0}, tree_inorder(t, x, n)=2, x={-3:0}] [L83] EXPR x[0] VAL [a=2147483647, b={5:0}, calloc(n, sizeof(int))={-3:0}, n=1, t={-2:0}, t={-2:0}, x={-3:0}, x[0]=0] [L83] CALL __VERIFIER_assert(a == x[0]) VAL [\old(cond)=0] [L16] COND TRUE !cond VAL [\old(cond)=0, cond=0] [L16] reach_error() VAL [\old(cond)=0, cond=0] - StatisticsResult: Ultimate Automizer benchmark data CFG has 8 procedures, 84 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 3.4s, OverallIterations: 6, TraceHistogramMax: 3, PathProgramHistogramMax: 1, EmptinessCheckTime: 0.0s, AutomataDifference: 1.1s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, PartialOrderReductionTime: 0.0s, HoareTripleCheckerStatistics: 0 mSolverCounterUnknown, 214 SdHoareTripleChecker+Valid, 0.8s IncrementalHoareTripleChecker+Time, 0 mSdLazyCounter, 196 mSDsluCounter, 1958 SdHoareTripleChecker+Invalid, 0.6s Time, 0 mProtectedAction, 0 SdHoareTripleChecker+Unchecked, 0 IncrementalHoareTripleChecker+Unchecked, 1529 mSDsCounter, 160 IncrementalHoareTripleChecker+Valid, 0 mProtectedPredicate, 993 IncrementalHoareTripleChecker+Invalid, 1153 SdHoareTripleChecker+Unknown, 0 mSolverCounterNotChecked, 160 mSolverCounterUnsat, 429 mSDtfsCounter, 993 mSolverCounterSat, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Unknown, PredicateUnifierStatistics: 0 DeclaredPredicates, 280 GetRequests, 222 SyntacticMatches, 3 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 0.4s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=87occurred in iteration=5, InterpolantAutomatonStates: 34, 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, 16 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 1.3s InterpolantComputationTime, 451 NumberOfCodeBlocks, 451 NumberOfCodeBlocksAsserted, 8 NumberOfCheckSat, 408 ConstructedInterpolants, 0 QuantifiedInterpolants, 1167 SizeOfPredicates, 10 NumberOfNonLiveVariables, 635 ConjunctsInSsa, 40 ConjunctsInUnsatCore, 8 InterpolantComputations, 4 PerfectInterpolantSequences, 115/123 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! [2021-12-22 11:42:30,471 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request... --- End real Ultimate output --- Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE