/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/verifythis/tree_max_incorrect.c -------------------------------------------------------------------------------- This is Ultimate 0.2.0-b8ad66e [2020-10-23 18:21:27,451 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-23 18:21:27,454 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-23 18:21:27,498 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-10-23 18:21:27,499 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-10-23 18:21:27,503 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-10-23 18:21:27,506 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-10-23 18:21:27,515 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-10-23 18:21:27,519 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-10-23 18:21:27,526 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-10-23 18:21:27,527 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-10-23 18:21:27,529 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-10-23 18:21:27,529 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-23 18:21:27,532 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-23 18:21:27,534 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-23 18:21:27,536 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-23 18:21:27,537 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-23 18:21:27,541 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-23 18:21:27,548 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-23 18:21:27,556 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-23 18:21:27,558 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-23 18:21:27,560 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-23 18:21:27,561 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-23 18:21:27,564 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-23 18:21:27,572 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-10-23 18:21:27,589 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-10-23 18:21:27,591 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-10-23 18:21:27,591 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-10-23 18:21:27,592 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-10-23 18:21:27,653 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-23 18:21:27,653 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-23 18:21:27,657 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-10-23 18:21:27,658 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-10-23 18:21:27,658 INFO L138 SettingsManager]: * Use SBE=true [2020-10-23 18:21:27,658 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-23 18:21:27,658 INFO L138 SettingsManager]: * sizeof long=4 [2020-10-23 18:21:27,658 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-23 18:21:27,659 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-10-23 18:21:27,659 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-23 18:21:27,660 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-10-23 18:21:27,661 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-10-23 18:21:27,661 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-10-23 18:21:27,661 INFO L138 SettingsManager]: * sizeof long double=12 [2020-10-23 18:21:27,661 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-23 18:21:27,661 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-23 18:21:27,661 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-10-23 18:21:27,662 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-23 18:21:27,662 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-10-23 18:21:27,662 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-10-23 18:21:27,663 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-10-23 18:21:27,663 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-23 18:21:27,663 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-23 18:21:27,663 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-10-23 18:21:27,663 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-10-23 18:21:27,664 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-10-23 18:21:27,664 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-10-23 18:21:27,664 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-10-23 18:21:27,664 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-10-23 18:21:27,664 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-10-23 18:21:28,110 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-23 18:21:28,138 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-23 18:21:28,141 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-23 18:21:28,142 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-23 18:21:28,148 INFO L275 PluginConnector]: CDTParser initialized [2020-10-23 18:21:28,149 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/verifythis/tree_max_incorrect.c [2020-10-23 18:21:28,236 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0af900380/56b0684368474833b8b0c4b126e9ae51/FLAG2d9d03223 [2020-10-23 18:21:28,935 INFO L306 CDTParser]: Found 1 translation units. [2020-10-23 18:21:28,935 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/verifythis/tree_max_incorrect.c [2020-10-23 18:21:28,946 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0af900380/56b0684368474833b8b0c4b126e9ae51/FLAG2d9d03223 [2020-10-23 18:21:29,265 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0af900380/56b0684368474833b8b0c4b126e9ae51 [2020-10-23 18:21:29,268 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-23 18:21:29,275 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-10-23 18:21:29,276 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-23 18:21:29,277 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-23 18:21:29,281 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-23 18:21:29,283 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.10 06:21:29" (1/1) ... [2020-10-23 18:21:29,288 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2b0b65ee and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:21:29, skipping insertion in model container [2020-10-23 18:21:29,289 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.10 06:21:29" (1/1) ... [2020-10-23 18:21:29,297 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-23 18:21:29,315 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-23 18:21:29,482 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-23 18:21:29,494 INFO L203 MainTranslator]: Completed pre-run [2020-10-23 18:21:29,517 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-23 18:21:29,537 INFO L208 MainTranslator]: Completed translation [2020-10-23 18:21:29,538 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:21:29 WrapperNode [2020-10-23 18:21:29,538 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-23 18:21:29,539 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-23 18:21:29,539 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-23 18:21:29,540 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-23 18:21:29,551 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:21:29" (1/1) ... [2020-10-23 18:21:29,552 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:21:29" (1/1) ... [2020-10-23 18:21:29,561 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:21:29" (1/1) ... [2020-10-23 18:21:29,561 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:21:29" (1/1) ... [2020-10-23 18:21:29,571 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:21:29" (1/1) ... [2020-10-23 18:21:29,573 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:21:29" (1/1) ... [2020-10-23 18:21:29,575 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:21:29" (1/1) ... [2020-10-23 18:21:29,579 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-23 18:21:29,580 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-23 18:21:29,580 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-23 18:21:29,580 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-23 18:21:29,581 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:21:29" (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 [2020-10-23 18:21:29,657 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-10-23 18:21:29,657 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-23 18:21:29,657 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2020-10-23 18:21:29,657 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-10-23 18:21:29,657 INFO L138 BoogieDeclarations]: Found implementation of procedure nondet_tree [2020-10-23 18:21:29,657 INFO L138 BoogieDeclarations]: Found implementation of procedure max [2020-10-23 18:21:29,658 INFO L138 BoogieDeclarations]: Found implementation of procedure check [2020-10-23 18:21:29,658 INFO L138 BoogieDeclarations]: Found implementation of procedure task [2020-10-23 18:21:29,658 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-10-23 18:21:29,658 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-10-23 18:21:29,658 INFO L130 BoogieDeclarations]: Found specification of procedure free [2020-10-23 18:21:29,658 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-10-23 18:21:29,659 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2020-10-23 18:21:29,659 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-10-23 18:21:29,659 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2020-10-23 18:21:29,659 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2020-10-23 18:21:29,659 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-10-23 18:21:29,659 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-10-23 18:21:29,659 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_tree [2020-10-23 18:21:29,660 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-10-23 18:21:29,660 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-10-23 18:21:29,660 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-10-23 18:21:29,660 INFO L130 BoogieDeclarations]: Found specification of procedure max [2020-10-23 18:21:29,660 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-10-23 18:21:29,660 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-10-23 18:21:29,661 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-10-23 18:21:29,661 INFO L130 BoogieDeclarations]: Found specification of procedure task [2020-10-23 18:21:29,661 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-10-23 18:21:29,661 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-10-23 18:21:29,661 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-10-23 18:21:29,661 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-23 18:21:29,661 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-10-23 18:21:30,046 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-23 18:21:30,046 INFO L298 CfgBuilder]: Removed 0 assume(true) statements. [2020-10-23 18:21:30,051 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.10 06:21:30 BoogieIcfgContainer [2020-10-23 18:21:30,054 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-23 18:21:30,058 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-10-23 18:21:30,061 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-10-23 18:21:30,068 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-10-23 18:21:30,069 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.10 06:21:29" (1/3) ... [2020-10-23 18:21:30,070 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@a46a61e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.10 06:21:30, skipping insertion in model container [2020-10-23 18:21:30,070 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:21:29" (2/3) ... [2020-10-23 18:21:30,072 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@a46a61e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.10 06:21:30, skipping insertion in model container [2020-10-23 18:21:30,073 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.10 06:21:30" (3/3) ... [2020-10-23 18:21:30,078 INFO L111 eAbstractionObserver]: Analyzing ICFG tree_max_incorrect.c [2020-10-23 18:21:30,105 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-10-23 18:21:30,116 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-10-23 18:21:30,141 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-10-23 18:21:30,207 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-10-23 18:21:30,207 INFO L378 AbstractCegarLoop]: Hoare is true [2020-10-23 18:21:30,207 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-10-23 18:21:30,208 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-23 18:21:30,208 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-23 18:21:30,208 INFO L382 AbstractCegarLoop]: Difference is false [2020-10-23 18:21:30,208 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-23 18:21:30,208 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-10-23 18:21:30,244 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states. [2020-10-23 18:21:30,253 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-10-23 18:21:30,253 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:21:30,254 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] [2020-10-23 18:21:30,255 INFO L429 AbstractCegarLoop]: === Iteration 1 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:21:30,267 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:21:30,267 INFO L82 PathProgramCache]: Analyzing trace with hash -1479956305, now seen corresponding path program 1 times [2020-10-23 18:21:30,281 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:21:30,282 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [991094257] [2020-10-23 18:21:30,282 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:21:30,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:21:30,750 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 18:21:30,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:21:30,794 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-10-23 18:21:30,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:21:30,841 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-10-23 18:21:30,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:21:30,859 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 18:21:30,860 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [991094257] [2020-10-23 18:21:30,861 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 18:21:30,861 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2020-10-23 18:21:30,862 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [310441420] [2020-10-23 18:21:30,866 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-10-23 18:21:30,867 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 18:21:30,880 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-10-23 18:21:30,882 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2020-10-23 18:21:30,884 INFO L87 Difference]: Start difference. First operand 55 states. Second operand 10 states. [2020-10-23 18:21:31,823 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 18:21:31,824 INFO L93 Difference]: Finished difference Result 98 states and 125 transitions. [2020-10-23 18:21:31,824 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-10-23 18:21:31,826 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 25 [2020-10-23 18:21:31,826 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 18:21:31,837 INFO L225 Difference]: With dead ends: 98 [2020-10-23 18:21:31,837 INFO L226 Difference]: Without dead ends: 43 [2020-10-23 18:21:31,842 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=68, Invalid=238, Unknown=0, NotChecked=0, Total=306 [2020-10-23 18:21:31,861 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-10-23 18:21:31,891 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-10-23 18:21:31,893 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-10-23 18:21:31,895 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 52 transitions. [2020-10-23 18:21:31,897 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 52 transitions. Word has length 25 [2020-10-23 18:21:31,897 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 18:21:31,897 INFO L481 AbstractCegarLoop]: Abstraction has 43 states and 52 transitions. [2020-10-23 18:21:31,897 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-10-23 18:21:31,898 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 52 transitions. [2020-10-23 18:21:31,900 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-10-23 18:21:31,901 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:21:31,901 INFO L422 BasicCegarLoop]: trace histogram [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] [2020-10-23 18:21:31,901 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-10-23 18:21:31,901 INFO L429 AbstractCegarLoop]: === Iteration 2 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:21:31,902 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:21:31,902 INFO L82 PathProgramCache]: Analyzing trace with hash -2109190382, now seen corresponding path program 1 times [2020-10-23 18:21:31,903 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:21:31,903 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [351794003] [2020-10-23 18:21:31,903 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:21:31,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:21:32,029 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 18:21:32,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:21:32,054 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-10-23 18:21:32,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:21:32,125 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2020-10-23 18:21:32,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:21:32,133 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-10-23 18:21:32,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:21:32,141 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2020-10-23 18:21:32,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:21:32,175 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-10-23 18:21:32,176 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [351794003] [2020-10-23 18:21:32,176 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 18:21:32,176 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2020-10-23 18:21:32,176 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1931692914] [2020-10-23 18:21:32,178 INFO L461 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-10-23 18:21:32,178 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 18:21:32,179 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-10-23 18:21:32,179 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2020-10-23 18:21:32,180 INFO L87 Difference]: Start difference. First operand 43 states and 52 transitions. Second operand 11 states. [2020-10-23 18:21:32,703 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 18:21:32,703 INFO L93 Difference]: Finished difference Result 61 states and 73 transitions. [2020-10-23 18:21:32,704 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-10-23 18:21:32,704 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 35 [2020-10-23 18:21:32,705 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 18:21:32,707 INFO L225 Difference]: With dead ends: 61 [2020-10-23 18:21:32,707 INFO L226 Difference]: Without dead ends: 45 [2020-10-23 18:21:32,708 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-10-23 18:21:32,709 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-10-23 18:21:32,721 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-10-23 18:21:32,721 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-10-23 18:21:32,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 55 transitions. [2020-10-23 18:21:32,723 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 55 transitions. Word has length 35 [2020-10-23 18:21:32,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 18:21:32,724 INFO L481 AbstractCegarLoop]: Abstraction has 45 states and 55 transitions. [2020-10-23 18:21:32,724 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-10-23 18:21:32,724 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 55 transitions. [2020-10-23 18:21:32,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-10-23 18:21:32,726 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:21:32,727 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 18:21:32,727 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-10-23 18:21:32,727 INFO L429 AbstractCegarLoop]: === Iteration 3 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:21:32,728 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:21:32,728 INFO L82 PathProgramCache]: Analyzing trace with hash 841718904, now seen corresponding path program 1 times [2020-10-23 18:21:32,728 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:21:32,728 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1763773389] [2020-10-23 18:21:32,729 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:21:32,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-23 18:21:32,769 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-23 18:21:32,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-23 18:21:32,802 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-23 18:21:32,845 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-23 18:21:32,846 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-10-23 18:21:32,846 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-10-23 18:21:32,895 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 23.10 06:21:32 BoogieIcfgContainer [2020-10-23 18:21:32,895 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-10-23 18:21:32,898 INFO L168 Benchmark]: Toolchain (without parser) took 3627.21 ms. Allocated memory was 125.8 MB in the beginning and 201.3 MB in the end (delta: 75.5 MB). Free memory was 101.4 MB in the beginning and 159.2 MB in the end (delta: -57.8 MB). Peak memory consumption was 19.2 MB. Max. memory is 8.0 GB. [2020-10-23 18:21:32,899 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 125.8 MB. Free memory was 100.9 MB in the beginning and 100.9 MB in the end (delta: 66.7 kB). There was no memory consumed. Max. memory is 8.0 GB. [2020-10-23 18:21:32,900 INFO L168 Benchmark]: CACSL2BoogieTranslator took 262.11 ms. Allocated memory is still 125.8 MB. Free memory was 100.8 MB in the beginning and 90.9 MB in the end (delta: 9.9 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2020-10-23 18:21:32,901 INFO L168 Benchmark]: Boogie Preprocessor took 39.76 ms. Allocated memory is still 125.8 MB. Free memory was 90.9 MB in the beginning and 89.1 MB in the end (delta: 1.8 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2020-10-23 18:21:32,902 INFO L168 Benchmark]: RCFGBuilder took 473.86 ms. Allocated memory was 125.8 MB in the beginning and 167.8 MB in the end (delta: 41.9 MB). Free memory was 89.1 MB in the beginning and 143.3 MB in the end (delta: -54.2 MB). Peak memory consumption was 15.3 MB. Max. memory is 8.0 GB. [2020-10-23 18:21:32,903 INFO L168 Benchmark]: TraceAbstraction took 2837.60 ms. Allocated memory was 167.8 MB in the beginning and 201.3 MB in the end (delta: 33.6 MB). Free memory was 142.8 MB in the beginning and 159.2 MB in the end (delta: -16.4 MB). Peak memory consumption was 17.5 MB. Max. memory is 8.0 GB. [2020-10-23 18:21:32,908 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 125.8 MB. Free memory was 100.9 MB in the beginning and 100.9 MB in the end (delta: 66.7 kB). There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 262.11 ms. Allocated memory is still 125.8 MB. Free memory was 100.8 MB in the beginning and 90.9 MB in the end (delta: 9.9 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 39.76 ms. Allocated memory is still 125.8 MB. Free memory was 90.9 MB in the beginning and 89.1 MB in the end (delta: 1.8 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * RCFGBuilder took 473.86 ms. Allocated memory was 125.8 MB in the beginning and 167.8 MB in the end (delta: 41.9 MB). Free memory was 89.1 MB in the beginning and 143.3 MB in the end (delta: -54.2 MB). Peak memory consumption was 15.3 MB. Max. memory is 8.0 GB. * TraceAbstraction took 2837.60 ms. Allocated memory was 167.8 MB in the beginning and 201.3 MB in the end (delta: 33.6 MB). Free memory was 142.8 MB in the beginning and 159.2 MB in the end (delta: -16.4 MB). Peak memory consumption was 17.5 MB. Max. memory is 8.0 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: [L60] CALL, EXPR nondet_tree() [L20] COND FALSE !(__VERIFIER_nondet_bool()) [L23] struct node *n = (struct node *)malloc(sizeof(struct node)); [L24] n->data = __VERIFIER_nondet_int() [L25] CALL, EXPR nondet_tree() [L20] COND TRUE __VERIFIER_nondet_bool() [L21] return 0; VAL [\result={0:0}] [L25] RET, EXPR nondet_tree() VAL [malloc(sizeof(struct node))={-1:0}, n={-1:0}, nondet_tree()={0:0}] [L25] n->left = nondet_tree() [L26] CALL, EXPR nondet_tree() [L20] COND TRUE __VERIFIER_nondet_bool() [L21] return 0; VAL [\result={0:0}] [L26] RET, EXPR nondet_tree() VAL [malloc(sizeof(struct node))={-1:0}, n={-1:0}, nondet_tree()={0:0}] [L26] n->right = nondet_tree() [L27] return n; VAL [\result={-1:0}, malloc(sizeof(struct node))={-1:0}, n={-1:0}] [L60] RET, EXPR nondet_tree() VAL [nondet_tree()={-1:0}] [L60] CALL task(nondet_tree()) VAL [n={-1:0}] [L55] CALL, EXPR max(n) VAL [n={-1:0}] [L32] COND FALSE !(!n) [L35] EXPR n->left VAL [n={-1:0}, n={-1:0}, n->left={0:0}] [L35] CALL, EXPR max(n->left) VAL [n={0:0}] [L32] COND TRUE !n [L33] return -2147483648; VAL [\result=-2147483648, n={0:0}, n={0:0}] [L35] RET, EXPR max(n->left) VAL [max(n->left)=-2147483648, n={-1:0}, n={-1:0}, n->left={0:0}] [L35] int a = max(n->left); [L36] EXPR n->right VAL [a=-2147483648, n={-1:0}, n={-1:0}, n->right={0:0}] [L36] CALL, EXPR max(n->right) VAL [n={0:0}] [L32] COND TRUE !n [L33] return -2147483648; VAL [\result=-2147483648, n={0:0}, n={0:0}] [L36] RET, EXPR max(n->right) VAL [a=-2147483648, max(n->right)=-2147483648, n={-1:0}, n={-1:0}, n->right={0:0}] [L36] int b = max(n->right); [L37] COND TRUE a >= b [L37] return a; VAL [\result=-2147483648, a=-2147483648, b=-2147483648, n={-1:0}, n={-1:0}] [L55] RET, EXPR max(n) VAL [max(n)=-2147483648, n={-1:0}, n={-1:0}] [L55] int a = max(n); [L56] CALL check(n, a) VAL [\old(a)=-2147483648, n={-1:0}] [L43] COND TRUE \read(*n) [L44] EXPR n->data VAL [\old(a)=-2147483648, a=-2147483648, n={-1:0}, n={-1:0}, n->data=-2147483647] [L44] CALL __VERIFIER_assert(n->data <= a) VAL [\old(cond)=0] [L11] COND TRUE !cond VAL [\old(cond)=0, cond=0] [L11] CALL reach_error() [L9] __assert_fail("0", "tree_max_incorrect.c", 9, "reach_error") - StatisticsResult: Ultimate Automizer benchmark data CFG has 9 procedures, 55 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 2.6s, OverallIterations: 3, TraceHistogramMax: 3, AutomataDifference: 1.5s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 81 SDtfs, 141 SDslu, 281 SDs, 0 SdLazy, 527 SolverSat, 107 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.6s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 47 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.8s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=55occurred 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, 108 NumberOfCodeBlocks, 108 NumberOfCodeBlocksAsserted, 3 NumberOfCheckSat, 58 ConstructedInterpolants, 0 QuantifiedInterpolants, 9088 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 2 InterpolantComputations, 2 PerfectInterpolantSequences, 9/9 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...