/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.use.separate.solver.for.trace.checks true -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf -i ../../../trunk/examples/svcomp/verifythis/tree_max_incorrect.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-267fbe0 [2020-07-17 17:23:16,224 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-17 17:23:16,228 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-17 17:23:16,248 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-17 17:23:16,248 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-17 17:23:16,250 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-17 17:23:16,252 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-17 17:23:16,263 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-17 17:23:16,266 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-17 17:23:16,269 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-17 17:23:16,272 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-17 17:23:16,274 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-17 17:23:16,275 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-17 17:23:16,277 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-17 17:23:16,278 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-17 17:23:16,279 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-17 17:23:16,279 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-17 17:23:16,280 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-17 17:23:16,282 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-17 17:23:16,283 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-17 17:23:16,285 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-17 17:23:16,286 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-17 17:23:16,287 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-17 17:23:16,287 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-17 17:23:16,289 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-07-17 17:23:16,290 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-07-17 17:23:16,290 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-07-17 17:23:16,291 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-07-17 17:23:16,291 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-07-17 17:23:16,292 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-07-17 17:23:16,292 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-07-17 17:23:16,293 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-07-17 17:23:16,294 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-07-17 17:23:16,295 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-07-17 17:23:16,296 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-07-17 17:23:16,296 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-07-17 17:23:16,297 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-07-17 17:23:16,297 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-07-17 17:23:16,297 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-17 17:23:16,298 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-17 17:23:16,299 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-17 17:23:16,299 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf [2020-07-17 17:23:16,309 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-17 17:23:16,309 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-17 17:23:16,311 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-17 17:23:16,311 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-17 17:23:16,311 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-17 17:23:16,311 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-17 17:23:16,311 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-17 17:23:16,312 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-17 17:23:16,312 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-17 17:23:16,312 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-17 17:23:16,312 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-17 17:23:16,312 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-17 17:23:16,312 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-17 17:23:16,313 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-17 17:23:16,313 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-17 17:23:16,313 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-07-17 17:23:16,313 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-17 17:23:16,313 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-17 17:23:16,314 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-17 17:23:16,314 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-17 17:23:16,314 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-07-17 17:23:16,314 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-17 17:23:16,314 INFO L138 SettingsManager]: * Use separate solver for trace checks=false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use separate solver for trace checks -> true [2020-07-17 17:23:16,613 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-17 17:23:16,624 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-17 17:23:16,628 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-17 17:23:16,629 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-17 17:23:16,630 INFO L275 PluginConnector]: CDTParser initialized [2020-07-17 17:23:16,630 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/verifythis/tree_max_incorrect.c [2020-07-17 17:23:16,693 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2d64257d4/e32d078a0c7d452c934de8325ce031f7/FLAGa15a0678a [2020-07-17 17:23:17,155 INFO L306 CDTParser]: Found 1 translation units. [2020-07-17 17:23:17,155 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/verifythis/tree_max_incorrect.c [2020-07-17 17:23:17,163 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2d64257d4/e32d078a0c7d452c934de8325ce031f7/FLAGa15a0678a [2020-07-17 17:23:17,513 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2d64257d4/e32d078a0c7d452c934de8325ce031f7 [2020-07-17 17:23:17,524 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-17 17:23:17,530 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-17 17:23:17,534 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-17 17:23:17,534 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-17 17:23:17,538 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-17 17:23:17,539 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.07 05:23:17" (1/1) ... [2020-07-17 17:23:17,543 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3c699f3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 05:23:17, skipping insertion in model container [2020-07-17 17:23:17,543 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.07 05:23:17" (1/1) ... [2020-07-17 17:23:17,552 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-17 17:23:17,576 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-17 17:23:17,779 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-17 17:23:17,791 INFO L203 MainTranslator]: Completed pre-run [2020-07-17 17:23:17,813 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-17 17:23:17,832 INFO L208 MainTranslator]: Completed translation [2020-07-17 17:23:17,833 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 05:23:17 WrapperNode [2020-07-17 17:23:17,833 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-17 17:23:17,834 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-17 17:23:17,834 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-17 17:23:17,834 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-17 17:23:17,933 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 05:23:17" (1/1) ... [2020-07-17 17:23:17,934 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 05:23:17" (1/1) ... [2020-07-17 17:23:17,946 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 05:23:17" (1/1) ... [2020-07-17 17:23:17,947 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 05:23:17" (1/1) ... [2020-07-17 17:23:17,958 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 05:23:17" (1/1) ... [2020-07-17 17:23:17,961 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 05:23:17" (1/1) ... [2020-07-17 17:23:17,963 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 05:23:17" (1/1) ... [2020-07-17 17:23:17,966 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-17 17:23:17,966 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-17 17:23:17,966 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-17 17:23:17,967 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-17 17:23:17,968 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 05:23:17" (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 [2020-07-17 17:23:18,033 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-17 17:23:18,034 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-17 17:23:18,034 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-17 17:23:18,034 INFO L138 BoogieDeclarations]: Found implementation of procedure nondet_tree [2020-07-17 17:23:18,034 INFO L138 BoogieDeclarations]: Found implementation of procedure max [2020-07-17 17:23:18,034 INFO L138 BoogieDeclarations]: Found implementation of procedure check [2020-07-17 17:23:18,034 INFO L138 BoogieDeclarations]: Found implementation of procedure task [2020-07-17 17:23:18,034 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-17 17:23:18,035 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-07-17 17:23:18,035 INFO L130 BoogieDeclarations]: Found specification of procedure free [2020-07-17 17:23:18,035 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-17 17:23:18,035 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2020-07-17 17:23:18,035 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-17 17:23:18,035 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-17 17:23:18,036 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_tree [2020-07-17 17:23:18,036 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-07-17 17:23:18,036 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-07-17 17:23:18,036 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-07-17 17:23:18,036 INFO L130 BoogieDeclarations]: Found specification of procedure max [2020-07-17 17:23:18,036 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-07-17 17:23:18,037 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-07-17 17:23:18,037 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-07-17 17:23:18,037 INFO L130 BoogieDeclarations]: Found specification of procedure task [2020-07-17 17:23:18,037 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-17 17:23:18,038 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-17 17:23:18,038 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-17 17:23:18,038 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-07-17 17:23:18,364 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-17 17:23:18,365 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-17 17:23:18,371 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 17.07 05:23:18 BoogieIcfgContainer [2020-07-17 17:23:18,371 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-17 17:23:18,373 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-17 17:23:18,373 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-17 17:23:18,377 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-17 17:23:18,377 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 17.07 05:23:17" (1/3) ... [2020-07-17 17:23:18,378 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2266312b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 17.07 05:23:18, skipping insertion in model container [2020-07-17 17:23:18,379 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.07 05:23:17" (2/3) ... [2020-07-17 17:23:18,379 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2266312b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 17.07 05:23:18, skipping insertion in model container [2020-07-17 17:23:18,379 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 17.07 05:23:18" (3/3) ... [2020-07-17 17:23:18,382 INFO L109 eAbstractionObserver]: Analyzing ICFG tree_max_incorrect.c [2020-07-17 17:23:18,395 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-07-17 17:23:18,404 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-17 17:23:18,433 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-17 17:23:18,468 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-17 17:23:18,468 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-17 17:23:18,468 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-07-17 17:23:18,468 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-17 17:23:18,469 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-17 17:23:18,469 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-17 17:23:18,469 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-17 17:23:18,469 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-17 17:23:18,504 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states. [2020-07-17 17:23:18,526 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-07-17 17:23:18,526 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 17:23:18,528 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] [2020-07-17 17:23:18,528 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 17:23:18,534 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 17:23:18,534 INFO L82 PathProgramCache]: Analyzing trace with hash -1509507830, now seen corresponding path program 1 times [2020-07-17 17:23:18,543 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 17:23:18,543 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [526936697] [2020-07-17 17:23:18,544 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 17:23:18,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:23:18,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:23:18,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:23:19,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:23:19,034 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-17 17:23:19,040 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [526936697] [2020-07-17 17:23:19,043 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-17 17:23:19,044 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2020-07-17 17:23:19,046 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1269487656] [2020-07-17 17:23:19,056 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-17 17:23:19,056 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 17:23:19,072 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-17 17:23:19,074 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2020-07-17 17:23:19,077 INFO L87 Difference]: Start difference. First operand 83 states. Second operand 10 states. [2020-07-17 17:23:19,994 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 17:23:19,994 INFO L93 Difference]: Finished difference Result 134 states and 160 transitions. [2020-07-17 17:23:19,995 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-17 17:23:19,996 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 33 [2020-07-17 17:23:19,997 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 17:23:20,012 INFO L225 Difference]: With dead ends: 134 [2020-07-17 17:23:20,012 INFO L226 Difference]: Without dead ends: 74 [2020-07-17 17:23:20,018 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=68, Invalid=238, Unknown=0, NotChecked=0, Total=306 [2020-07-17 17:23:20,036 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2020-07-17 17:23:20,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 74. [2020-07-17 17:23:20,081 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2020-07-17 17:23:20,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 83 transitions. [2020-07-17 17:23:20,090 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 83 transitions. Word has length 33 [2020-07-17 17:23:20,091 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 17:23:20,091 INFO L479 AbstractCegarLoop]: Abstraction has 74 states and 83 transitions. [2020-07-17 17:23:20,091 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-17 17:23:20,091 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 83 transitions. [2020-07-17 17:23:20,098 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-07-17 17:23:20,099 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 17:23:20,099 INFO L422 BasicCegarLoop]: trace histogram [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] [2020-07-17 17:23:20,100 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-07-17 17:23:20,100 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 17:23:20,100 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 17:23:20,101 INFO L82 PathProgramCache]: Analyzing trace with hash -1181568947, now seen corresponding path program 1 times [2020-07-17 17:23:20,101 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 17:23:20,101 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1009458065] [2020-07-17 17:23:20,101 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 17:23:20,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:23:20,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:23:20,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:23:20,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:23:20,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:23:20,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-17 17:23:20,513 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-07-17 17:23:20,514 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1009458065] [2020-07-17 17:23:20,514 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-17 17:23:20,514 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2020-07-17 17:23:20,515 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [601258529] [2020-07-17 17:23:20,517 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-17 17:23:20,517 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-17 17:23:20,518 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-17 17:23:20,518 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2020-07-17 17:23:20,518 INFO L87 Difference]: Start difference. First operand 74 states and 83 transitions. Second operand 12 states. [2020-07-17 17:23:21,100 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-17 17:23:21,101 INFO L93 Difference]: Finished difference Result 99 states and 111 transitions. [2020-07-17 17:23:21,102 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-17 17:23:21,102 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 54 [2020-07-17 17:23:21,103 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-17 17:23:21,105 INFO L225 Difference]: With dead ends: 99 [2020-07-17 17:23:21,105 INFO L226 Difference]: Without dead ends: 76 [2020-07-17 17:23:21,107 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=63, Invalid=279, Unknown=0, NotChecked=0, Total=342 [2020-07-17 17:23:21,108 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-07-17 17:23:21,123 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 76. [2020-07-17 17:23:21,123 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-17 17:23:21,125 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 86 transitions. [2020-07-17 17:23:21,126 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 86 transitions. Word has length 54 [2020-07-17 17:23:21,126 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-17 17:23:21,127 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 86 transitions. [2020-07-17 17:23:21,127 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-17 17:23:21,127 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 86 transitions. [2020-07-17 17:23:21,130 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2020-07-17 17:23:21,130 INFO L414 BasicCegarLoop]: Found error trace [2020-07-17 17:23:21,131 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 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] [2020-07-17 17:23:21,131 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-07-17 17:23:21,131 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-17 17:23:21,131 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-17 17:23:21,131 INFO L82 PathProgramCache]: Analyzing trace with hash 2103557100, now seen corresponding path program 1 times [2020-07-17 17:23:21,132 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-17 17:23:21,132 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1276547684] [2020-07-17 17:23:21,132 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-07-17 17:23:21,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-17 17:23:21,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-17 17:23:21,290 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-17 17:23:21,291 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-17 17:23:21,291 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-07-17 17:23:21,357 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 17.07 05:23:21 BoogieIcfgContainer [2020-07-17 17:23:21,357 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-17 17:23:21,360 INFO L168 Benchmark]: Toolchain (without parser) took 3830.88 ms. Allocated memory was 146.3 MB in the beginning and 244.3 MB in the end (delta: 98.0 MB). Free memory was 102.6 MB in the beginning and 125.2 MB in the end (delta: -22.5 MB). Peak memory consumption was 75.5 MB. Max. memory is 7.1 GB. [2020-07-17 17:23:21,361 INFO L168 Benchmark]: CDTParser took 0.19 ms. Allocated memory is still 146.3 MB. Free memory was 121.7 MB in the beginning and 121.5 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-07-17 17:23:21,362 INFO L168 Benchmark]: CACSL2BoogieTranslator took 299.52 ms. Allocated memory is still 146.3 MB. Free memory was 102.4 MB in the beginning and 91.9 MB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. [2020-07-17 17:23:21,363 INFO L168 Benchmark]: Boogie Preprocessor took 132.23 ms. Allocated memory was 146.3 MB in the beginning and 204.5 MB in the end (delta: 58.2 MB). Free memory was 91.9 MB in the beginning and 182.3 MB in the end (delta: -90.5 MB). Peak memory consumption was 10.2 MB. Max. memory is 7.1 GB. [2020-07-17 17:23:21,364 INFO L168 Benchmark]: RCFGBuilder took 405.25 ms. Allocated memory is still 204.5 MB. Free memory was 181.7 MB in the beginning and 159.5 MB in the end (delta: 22.2 MB). Peak memory consumption was 22.2 MB. Max. memory is 7.1 GB. [2020-07-17 17:23:21,365 INFO L168 Benchmark]: TraceAbstraction took 2984.85 ms. Allocated memory was 204.5 MB in the beginning and 244.3 MB in the end (delta: 39.8 MB). Free memory was 158.9 MB in the beginning and 125.2 MB in the end (delta: 33.7 MB). Peak memory consumption was 73.6 MB. Max. memory is 7.1 GB. [2020-07-17 17:23:21,370 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.19 ms. Allocated memory is still 146.3 MB. Free memory was 121.7 MB in the beginning and 121.5 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 299.52 ms. Allocated memory is still 146.3 MB. Free memory was 102.4 MB in the beginning and 91.9 MB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 132.23 ms. Allocated memory was 146.3 MB in the beginning and 204.5 MB in the end (delta: 58.2 MB). Free memory was 91.9 MB in the beginning and 182.3 MB in the end (delta: -90.5 MB). Peak memory consumption was 10.2 MB. Max. memory is 7.1 GB. * RCFGBuilder took 405.25 ms. Allocated memory is still 204.5 MB. Free memory was 181.7 MB in the beginning and 159.5 MB in the end (delta: 22.2 MB). Peak memory consumption was 22.2 MB. Max. memory is 7.1 GB. * TraceAbstraction took 2984.85 ms. Allocated memory was 204.5 MB in the beginning and 244.3 MB in the end (delta: 39.8 MB). Free memory was 158.9 MB in the beginning and 125.2 MB in the end (delta: 33.7 MB). Peak memory consumption was 73.6 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 9]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L58] CALL, EXPR nondet_tree() [L18] COND FALSE !(__VERIFIER_nondet_bool()) VAL [__VERIFIER_nondet_bool()=0] [L21] struct node *n = (struct node *)malloc(sizeof(struct node)); VAL [malloc(sizeof(struct node))={-1:0}, n={-1:0}] [L22] n->data = __VERIFIER_nondet_int() VAL [__VERIFIER_nondet_int()=-2147483647, malloc(sizeof(struct node))={-1:0}, n={-1:0}] [L23] CALL, EXPR nondet_tree() [L18] COND TRUE __VERIFIER_nondet_bool() VAL [__VERIFIER_nondet_bool()=1] [L19] return 0; VAL [\result={0:0}] [L23] RET, EXPR nondet_tree() VAL [malloc(sizeof(struct node))={-1:0}, n={-1:0}, nondet_tree()={0:0}] [L23] n->left = nondet_tree() VAL [malloc(sizeof(struct node))={-1:0}, n={-1:0}, nondet_tree()={0:0}] [L24] CALL, EXPR nondet_tree() [L18] COND TRUE __VERIFIER_nondet_bool() VAL [__VERIFIER_nondet_bool()=1] [L19] return 0; VAL [\result={0:0}] [L24] RET, EXPR nondet_tree() VAL [malloc(sizeof(struct node))={-1:0}, n={-1:0}, nondet_tree()={0:0}] [L24] n->right = nondet_tree() VAL [malloc(sizeof(struct node))={-1:0}, n={-1:0}, nondet_tree()={0:0}] [L25] return n; VAL [\result={-1:0}, malloc(sizeof(struct node))={-1:0}, n={-1:0}] [L58] RET, EXPR nondet_tree() VAL [nondet_tree()={-1:0}] [L58] CALL task(nondet_tree()) VAL [n={-1:0}] [L53] CALL, EXPR max(n) VAL [n={-1:0}] [L30] COND FALSE !(!n) VAL [n={-1:0}, n={-1:0}] [L33] EXPR n->left VAL [n={-1:0}, n={-1:0}, n->left={0:0}] [L33] CALL, EXPR max(n->left) VAL [n={0:0}] [L30] COND TRUE !n VAL [n={0:0}, n={0:0}] [L31] return -2147483648; VAL [\result=-2147483648, n={0:0}, n={0:0}] [L33] RET, EXPR max(n->left) VAL [max(n->left)=-2147483648, n={-1:0}, n={-1:0}, n->left={0:0}] [L33] int a = max(n->left); VAL [a=-2147483648, max(n->left)=-2147483648, n={-1:0}, n={-1:0}, n->left={0:0}] [L34] EXPR n->right VAL [a=-2147483648, n={-1:0}, n={-1:0}, n->right={0:0}] [L34] CALL, EXPR max(n->right) VAL [n={0:0}] [L30] COND TRUE !n VAL [n={0:0}, n={0:0}] [L31] return -2147483648; VAL [\result=-2147483648, n={0:0}, n={0:0}] [L34] RET, EXPR max(n->right) VAL [a=-2147483648, max(n->right)=-2147483648, n={-1:0}, n={-1:0}, n->right={0:0}] [L34] int b = max(n->right); VAL [a=-2147483648, b=-2147483648, max(n->right)=-2147483648, n={-1:0}, n={-1:0}, n->right={0:0}] [L35] COND TRUE a >= b VAL [a=-2147483648, b=-2147483648, n={-1:0}, n={-1:0}] [L35] return a; VAL [\result=-2147483648, a=-2147483648, b=-2147483648, n={-1:0}, n={-1:0}] [L53] RET, EXPR max(n) VAL [max(n)=-2147483648, n={-1:0}, n={-1:0}] [L53] int a = max(n); VAL [a=-2147483648, max(n)=-2147483648, n={-1:0}, n={-1:0}] [L54] CALL check(n, a) VAL [\old(a)=-2147483648, n={-1:0}] [L41] COND TRUE \read(*n) VAL [\old(a)=-2147483648, a=-2147483648, n={-1:0}, n={-1:0}] [L42] EXPR n->data VAL [\old(a)=-2147483648, a=-2147483648, n={-1:0}, n={-1:0}, n->data=-2147483647] [L42] CALL __VERIFIER_assert(n->data <= a) VAL [\old(cond)=0] [L9] COND TRUE !cond VAL [\old(cond)=0, cond=0] [L9] __VERIFIER_error() VAL [\old(cond)=0, cond=0] - StatisticsResult: Ultimate Automizer benchmark data CFG has 8 procedures, 83 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 2.8s, OverallIterations: 3, TraceHistogramMax: 3, AutomataDifference: 1.5s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 139 SDtfs, 269 SDslu, 374 SDs, 0 SdLazy, 921 SolverSat, 107 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.7s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 51 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.6s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=83occurred in iteration=0, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 2 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 0.6s InterpolantComputationTime, 164 NumberOfCodeBlocks, 164 NumberOfCodeBlocksAsserted, 3 NumberOfCheckSat, 85 ConstructedInterpolants, 0 QuantifiedInterpolants, 13119 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 2 InterpolantComputations, 2 PerfectInterpolantSequences, 11/11 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...