/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationQvasr_64.epf -i ../../../trunk/examples/svcomp/verifythis/tree_del_iter_incorrect.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-6c470ae [2022-02-15 04:05:00,718 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-02-15 04:05:00,727 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-02-15 04:05:00,777 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-02-15 04:05:00,778 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-02-15 04:05:00,780 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-02-15 04:05:00,783 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-02-15 04:05:00,788 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-02-15 04:05:00,791 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-02-15 04:05:00,796 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-02-15 04:05:00,796 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-02-15 04:05:00,797 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-02-15 04:05:00,797 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-02-15 04:05:00,798 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-02-15 04:05:00,798 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-02-15 04:05:00,799 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-02-15 04:05:00,799 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-02-15 04:05:00,800 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-02-15 04:05:00,801 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-02-15 04:05:00,802 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-02-15 04:05:00,802 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-02-15 04:05:00,805 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-02-15 04:05:00,807 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-02-15 04:05:00,808 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-02-15 04:05:00,814 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-02-15 04:05:00,814 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-02-15 04:05:00,814 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-02-15 04:05:00,815 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-02-15 04:05:00,815 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-02-15 04:05:00,816 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... 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[2022-02-15 04:05:00,819 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-02-15 04:05:00,819 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-02-15 04:05:00,820 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-02-15 04:05:00,822 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationQvasr_64.epf [2022-02-15 04:05:00,835 INFO L113 SettingsManager]: Loading preferences was successful [2022-02-15 04:05:00,835 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-02-15 04:05:00,836 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-02-15 04:05:00,836 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-02-15 04:05:00,836 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-02-15 04:05:00,836 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-02-15 04:05:00,836 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-02-15 04:05:00,836 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-02-15 04:05:00,836 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-02-15 04:05:00,836 INFO L138 SettingsManager]: * Use constant arrays=true [2022-02-15 04:05:00,836 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-02-15 04:05:00,837 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-02-15 04:05:00,837 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-02-15 04:05:00,837 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-02-15 04:05:00,837 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-02-15 04:05:00,837 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-02-15 04:05:00,837 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-02-15 04:05:00,837 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2022-02-15 04:05:00,837 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-02-15 04:05:00,837 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=QVASR [2022-02-15 04:05:00,837 INFO L138 SettingsManager]: * Use separate solver for trace checks=false 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-02-15 04:05:01,040 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-02-15 04:05:01,054 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-02-15 04:05:01,056 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-02-15 04:05:01,057 INFO L271 PluginConnector]: Initializing CDTParser... [2022-02-15 04:05:01,057 INFO L275 PluginConnector]: CDTParser initialized [2022-02-15 04:05:01,058 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/verifythis/tree_del_iter_incorrect.c [2022-02-15 04:05:01,100 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/cb1913792/bb4f6b84de9346e2bcffbcd88cdab702/FLAGd16f7529f [2022-02-15 04:05:01,484 INFO L306 CDTParser]: Found 1 translation units. [2022-02-15 04:05:01,485 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/verifythis/tree_del_iter_incorrect.c [2022-02-15 04:05:01,494 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/cb1913792/bb4f6b84de9346e2bcffbcd88cdab702/FLAGd16f7529f [2022-02-15 04:05:01,858 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/cb1913792/bb4f6b84de9346e2bcffbcd88cdab702 [2022-02-15 04:05:01,860 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-02-15 04:05:01,862 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-02-15 04:05:01,863 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-02-15 04:05:01,863 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-02-15 04:05:01,866 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-02-15 04:05:01,866 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.02 04:05:01" (1/1) ... [2022-02-15 04:05:01,868 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3e4b116e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.02 04:05:01, skipping insertion in model container [2022-02-15 04:05:01,868 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.02 04:05:01" (1/1) ... [2022-02-15 04:05:01,872 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-02-15 04:05:01,889 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-02-15 04:05:02,051 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/verifythis/tree_del_iter_incorrect.c[619,632] [2022-02-15 04:05:02,116 WARN L1545 CHandler]: Possible shadowing of function min [2022-02-15 04:05:02,126 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-02-15 04:05:02,144 INFO L203 MainTranslator]: Completed pre-run [2022-02-15 04:05:02,174 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/verifythis/tree_del_iter_incorrect.c[619,632] [2022-02-15 04:05:02,189 WARN L1545 CHandler]: Possible shadowing of function min [2022-02-15 04:05:02,194 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-02-15 04:05:02,207 INFO L208 MainTranslator]: Completed translation [2022-02-15 04:05:02,208 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.02 04:05:02 WrapperNode [2022-02-15 04:05:02,208 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-02-15 04:05:02,208 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-02-15 04:05:02,209 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-02-15 04:05:02,209 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-02-15 04:05:02,216 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.02 04:05:02" (1/1) ... [2022-02-15 04:05:02,216 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.02 04:05:02" (1/1) ... [2022-02-15 04:05:02,225 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.02 04:05:02" (1/1) ... [2022-02-15 04:05:02,225 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.02 04:05:02" (1/1) ... [2022-02-15 04:05:02,237 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.02 04:05:02" (1/1) ... [2022-02-15 04:05:02,239 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.02 04:05:02" (1/1) ... [2022-02-15 04:05:02,241 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.02 04:05:02" (1/1) ... [2022-02-15 04:05:02,243 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-02-15 04:05:02,243 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-02-15 04:05:02,243 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-02-15 04:05:02,244 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-02-15 04:05:02,244 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.02 04:05:02" (1/1) ... [2022-02-15 04:05:02,249 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-02-15 04:05:02,257 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-02-15 04:05:02,266 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) [2022-02-15 04:05:02,276 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 [2022-02-15 04:05:02,291 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-02-15 04:05:02,292 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-02-15 04:05:02,292 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-02-15 04:05:02,292 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-02-15 04:05:02,292 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-02-15 04:05:02,292 INFO L138 BoogieDeclarations]: Found implementation of procedure nondet_tree [2022-02-15 04:05:02,292 INFO L138 BoogieDeclarations]: Found implementation of procedure min [2022-02-15 04:05:02,292 INFO L138 BoogieDeclarations]: Found implementation of procedure tree_del [2022-02-15 04:05:02,292 INFO L138 BoogieDeclarations]: Found implementation of procedure tree_inorder [2022-02-15 04:05:02,292 INFO L138 BoogieDeclarations]: Found implementation of procedure size [2022-02-15 04:05:02,292 INFO L138 BoogieDeclarations]: Found implementation of procedure task [2022-02-15 04:05:02,292 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-02-15 04:05:02,292 INFO L138 BoogieDeclarations]: Found implementation of procedure #Ultimate.meminit [2022-02-15 04:05:02,292 INFO L130 BoogieDeclarations]: Found specification of procedure calloc [2022-02-15 04:05:02,292 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2022-02-15 04:05:02,293 INFO L130 BoogieDeclarations]: Found specification of procedure free [2022-02-15 04:05:02,293 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2022-02-15 04:05:02,293 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2022-02-15 04:05:02,293 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-02-15 04:05:02,293 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-02-15 04:05:02,293 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-02-15 04:05:02,293 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-02-15 04:05:02,293 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-02-15 04:05:02,293 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-02-15 04:05:02,293 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_tree [2022-02-15 04:05:02,293 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2022-02-15 04:05:02,293 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-02-15 04:05:02,293 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2022-02-15 04:05:02,294 INFO L130 BoogieDeclarations]: Found specification of procedure min [2022-02-15 04:05:02,294 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2022-02-15 04:05:02,294 INFO L130 BoogieDeclarations]: Found specification of procedure tree_del [2022-02-15 04:05:02,294 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-02-15 04:05:02,294 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-02-15 04:05:02,294 INFO L130 BoogieDeclarations]: Found specification of procedure tree_inorder [2022-02-15 04:05:02,294 INFO L130 BoogieDeclarations]: Found specification of procedure size [2022-02-15 04:05:02,294 INFO L130 BoogieDeclarations]: Found specification of procedure task [2022-02-15 04:05:02,294 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-02-15 04:05:02,294 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.meminit [2022-02-15 04:05:02,294 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-02-15 04:05:02,294 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-02-15 04:05:02,294 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-02-15 04:05:02,294 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-02-15 04:05:02,361 INFO L234 CfgBuilder]: Building ICFG [2022-02-15 04:05:02,363 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-02-15 04:05:02,571 INFO L275 CfgBuilder]: Performing block encoding [2022-02-15 04:05:02,576 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-02-15 04:05:02,576 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2022-02-15 04:05:02,577 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.02 04:05:02 BoogieIcfgContainer [2022-02-15 04:05:02,577 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-02-15 04:05:02,579 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-02-15 04:05:02,579 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-02-15 04:05:02,605 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-02-15 04:05:02,605 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 15.02 04:05:01" (1/3) ... [2022-02-15 04:05:02,605 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@48dbe32b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.02 04:05:02, skipping insertion in model container [2022-02-15 04:05:02,605 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.02 04:05:02" (2/3) ... [2022-02-15 04:05:02,606 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@48dbe32b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.02 04:05:02, skipping insertion in model container [2022-02-15 04:05:02,606 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.02 04:05:02" (3/3) ... [2022-02-15 04:05:02,607 INFO L111 eAbstractionObserver]: Analyzing ICFG tree_del_iter_incorrect.c [2022-02-15 04:05:02,610 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-02-15 04:05:02,610 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-02-15 04:05:02,636 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-02-15 04:05:02,640 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=AcceleratedInterpolation, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, 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=QVASR [2022-02-15 04:05:02,640 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-02-15 04:05:02,650 INFO L276 IsEmpty]: Start isEmpty. Operand has 96 states, 58 states have (on average 1.2241379310344827) internal successors, (71), 59 states have internal predecessors, (71), 25 states have call successors, (25), 11 states have call predecessors, (25), 11 states have return successors, (25), 25 states have call predecessors, (25), 25 states have call successors, (25) [2022-02-15 04:05:02,657 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-02-15 04:05:02,657 INFO L506 BasicCegarLoop]: Found error trace [2022-02-15 04:05:02,657 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, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-15 04:05:02,658 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-15 04:05:02,661 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-15 04:05:02,661 INFO L85 PathProgramCache]: Analyzing trace with hash 1536185801, now seen corresponding path program 1 times [2022-02-15 04:05:02,666 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-15 04:05:02,666 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [624019107] [2022-02-15 04:05:02,666 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-15 04:05:02,675 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-15 04:05:02,708 INFO L274 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-02-15 04:05:02,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 04:05:02,797 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-15 04:05:02,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 04:05:02,813 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2022-02-15 04:05:02,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 04:05:02,820 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2022-02-15 04:05:02,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 04:05:02,824 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-02-15 04:05:02,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 04:05:02,828 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2022-02-15 04:05:02,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 04:05:02,837 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2022-02-15 04:05:02,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 04:05:02,853 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 34 [2022-02-15 04:05:02,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 04:05:02,865 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-15 04:05:02,867 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-15 04:05:02,867 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [624019107] [2022-02-15 04:05:02,868 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [624019107] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-15 04:05:02,868 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-15 04:05:02,868 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-02-15 04:05:02,869 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [667068961] [2022-02-15 04:05:02,870 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-15 04:05:02,873 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-02-15 04:05:02,873 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-15 04:05:02,894 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-02-15 04:05:02,894 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2022-02-15 04:05:02,897 INFO L87 Difference]: Start difference. First operand has 96 states, 58 states have (on average 1.2241379310344827) internal successors, (71), 59 states have internal predecessors, (71), 25 states have call successors, (25), 11 states have call predecessors, (25), 11 states have return successors, (25), 25 states have call predecessors, (25), 25 states have call successors, (25) Second operand has 6 states, 6 states have (on average 4.5) internal successors, (27), 2 states have internal predecessors, (27), 2 states have call successors, (10), 6 states have call predecessors, (10), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-02-15 04:05:03,237 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-15 04:05:03,238 INFO L93 Difference]: Finished difference Result 168 states and 221 transitions. [2022-02-15 04:05:03,239 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-02-15 04:05:03,240 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.5) internal successors, (27), 2 states have internal predecessors, (27), 2 states have call successors, (10), 6 states have call predecessors, (10), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 44 [2022-02-15 04:05:03,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-15 04:05:03,259 INFO L225 Difference]: With dead ends: 168 [2022-02-15 04:05:03,259 INFO L226 Difference]: Without dead ends: 95 [2022-02-15 04:05:03,262 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=24, Invalid=32, Unknown=0, NotChecked=0, Total=56 [2022-02-15 04:05:03,264 INFO L933 BasicCegarLoop]: 78 mSDtfsCounter, 167 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 98 mSolverCounterSat, 154 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 185 SdHoareTripleChecker+Valid, 80 SdHoareTripleChecker+Invalid, 252 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 154 IncrementalHoareTripleChecker+Valid, 98 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-02-15 04:05:03,265 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [185 Valid, 80 Invalid, 252 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [154 Valid, 98 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-02-15 04:05:03,277 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2022-02-15 04:05:03,298 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 88. [2022-02-15 04:05:03,299 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 53 states have (on average 1.150943396226415) internal successors, (61), 53 states have internal predecessors, (61), 25 states have call successors, (25), 11 states have call predecessors, (25), 9 states have return successors, (23), 23 states have call predecessors, (23), 23 states have call successors, (23) [2022-02-15 04:05:03,301 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 109 transitions. [2022-02-15 04:05:03,302 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 109 transitions. Word has length 44 [2022-02-15 04:05:03,302 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-15 04:05:03,302 INFO L470 AbstractCegarLoop]: Abstraction has 88 states and 109 transitions. [2022-02-15 04:05:03,302 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 4.5) internal successors, (27), 2 states have internal predecessors, (27), 2 states have call successors, (10), 6 states have call predecessors, (10), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2022-02-15 04:05:03,303 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 109 transitions. [2022-02-15 04:05:03,304 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-02-15 04:05:03,304 INFO L506 BasicCegarLoop]: Found error trace [2022-02-15 04:05:03,304 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, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-15 04:05:03,305 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-02-15 04:05:03,305 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-15 04:05:03,305 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-15 04:05:03,306 INFO L85 PathProgramCache]: Analyzing trace with hash -152757941, now seen corresponding path program 1 times [2022-02-15 04:05:03,306 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-15 04:05:03,306 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1418419626] [2022-02-15 04:05:03,306 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-15 04:05:03,307 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-15 04:05:03,308 INFO L274 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-02-15 04:05:03,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 04:05:03,370 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-15 04:05:03,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 04:05:03,383 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2022-02-15 04:05:03,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 04:05:03,387 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2022-02-15 04:05:03,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 04:05:03,391 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-02-15 04:05:03,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 04:05:03,401 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2022-02-15 04:05:03,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 04:05:03,424 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2022-02-15 04:05:03,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 04:05:03,438 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 34 [2022-02-15 04:05:03,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 04:05:03,443 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-15 04:05:03,443 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-15 04:05:03,443 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1418419626] [2022-02-15 04:05:03,443 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1418419626] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-15 04:05:03,444 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-15 04:05:03,444 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-02-15 04:05:03,444 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1318848067] [2022-02-15 04:05:03,444 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-15 04:05:03,444 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-02-15 04:05:03,445 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-15 04:05:03,445 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-02-15 04:05:03,445 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2022-02-15 04:05:03,445 INFO L87 Difference]: Start difference. First operand 88 states and 109 transitions. Second operand has 11 states, 10 states have (on average 2.7) internal successors, (27), 6 states have internal predecessors, (27), 3 states have call successors, (10), 6 states have call predecessors, (10), 3 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2022-02-15 04:05:03,887 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-15 04:05:03,887 INFO L93 Difference]: Finished difference Result 154 states and 197 transitions. [2022-02-15 04:05:03,887 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-02-15 04:05:03,888 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 2.7) internal successors, (27), 6 states have internal predecessors, (27), 3 states have call successors, (10), 6 states have call predecessors, (10), 3 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) Word has length 44 [2022-02-15 04:05:03,888 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-15 04:05:03,890 INFO L225 Difference]: With dead ends: 154 [2022-02-15 04:05:03,890 INFO L226 Difference]: Without dead ends: 97 [2022-02-15 04:05:03,891 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=77, Invalid=229, Unknown=0, NotChecked=0, Total=306 [2022-02-15 04:05:03,891 INFO L933 BasicCegarLoop]: 69 mSDtfsCounter, 98 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 658 mSolverCounterSat, 99 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 116 SdHoareTripleChecker+Valid, 79 SdHoareTripleChecker+Invalid, 757 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 99 IncrementalHoareTripleChecker+Valid, 658 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-02-15 04:05:03,892 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [116 Valid, 79 Invalid, 757 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [99 Valid, 658 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-02-15 04:05:03,893 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2022-02-15 04:05:03,917 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 90. [2022-02-15 04:05:03,931 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 54 states have (on average 1.1481481481481481) internal successors, (62), 55 states have internal predecessors, (62), 25 states have call successors, (25), 11 states have call predecessors, (25), 10 states have return successors, (26), 23 states have call predecessors, (26), 23 states have call successors, (26) [2022-02-15 04:05:03,932 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 113 transitions. [2022-02-15 04:05:03,932 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 113 transitions. Word has length 44 [2022-02-15 04:05:03,932 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-15 04:05:03,933 INFO L470 AbstractCegarLoop]: Abstraction has 90 states and 113 transitions. [2022-02-15 04:05:03,933 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 2.7) internal successors, (27), 6 states have internal predecessors, (27), 3 states have call successors, (10), 6 states have call predecessors, (10), 3 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2022-02-15 04:05:03,933 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 113 transitions. [2022-02-15 04:05:03,934 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2022-02-15 04:05:03,934 INFO L506 BasicCegarLoop]: Found error trace [2022-02-15 04:05:03,934 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, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-15 04:05:03,934 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-02-15 04:05:03,935 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-15 04:05:03,935 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-15 04:05:03,935 INFO L85 PathProgramCache]: Analyzing trace with hash 2001282500, now seen corresponding path program 1 times [2022-02-15 04:05:03,935 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-15 04:05:03,935 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [594893462] [2022-02-15 04:05:03,935 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-15 04:05:03,936 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-15 04:05:03,938 INFO L274 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-02-15 04:05:03,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 04:05:03,996 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-15 04:05:03,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 04:05:04,008 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2022-02-15 04:05:04,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 04:05:04,030 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2022-02-15 04:05:04,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 04:05:04,034 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-02-15 04:05:04,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 04:05:04,080 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-02-15 04:05:04,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 04:05:04,084 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2022-02-15 04:05:04,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 04:05:04,087 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 35 [2022-02-15 04:05:04,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 04:05:04,096 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2022-02-15 04:05:04,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 04:05:04,109 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 46 [2022-02-15 04:05:04,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 04:05:04,113 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-02-15 04:05:04,113 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-15 04:05:04,113 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [594893462] [2022-02-15 04:05:04,113 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [594893462] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-15 04:05:04,113 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-15 04:05:04,113 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2022-02-15 04:05:04,113 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1774690926] [2022-02-15 04:05:04,113 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-15 04:05:04,114 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-02-15 04:05:04,114 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-15 04:05:04,114 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-02-15 04:05:04,114 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=129, Unknown=0, NotChecked=0, Total=156 [2022-02-15 04:05:04,114 INFO L87 Difference]: Start difference. First operand 90 states and 113 transitions. Second operand has 13 states, 12 states have (on average 2.6666666666666665) internal successors, (32), 7 states have internal predecessors, (32), 6 states have call successors, (12), 7 states have call predecessors, (12), 3 states have return successors, (9), 6 states have call predecessors, (9), 5 states have call successors, (9) [2022-02-15 04:05:04,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-15 04:05:04,710 INFO L93 Difference]: Finished difference Result 164 states and 209 transitions. [2022-02-15 04:05:04,710 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-02-15 04:05:04,710 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 2.6666666666666665) internal successors, (32), 7 states have internal predecessors, (32), 6 states have call successors, (12), 7 states have call predecessors, (12), 3 states have return successors, (9), 6 states have call predecessors, (9), 5 states have call successors, (9) Word has length 56 [2022-02-15 04:05:04,710 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-15 04:05:04,713 INFO L225 Difference]: With dead ends: 164 [2022-02-15 04:05:04,713 INFO L226 Difference]: Without dead ends: 96 [2022-02-15 04:05:04,714 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=107, Invalid=355, Unknown=0, NotChecked=0, Total=462 [2022-02-15 04:05:04,716 INFO L933 BasicCegarLoop]: 70 mSDtfsCounter, 175 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 848 mSolverCounterSat, 175 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 192 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 1023 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 175 IncrementalHoareTripleChecker+Valid, 848 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-02-15 04:05:04,716 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [192 Valid, 84 Invalid, 1023 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [175 Valid, 848 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-02-15 04:05:04,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2022-02-15 04:05:04,726 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 92. [2022-02-15 04:05:04,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 55 states have (on average 1.1454545454545455) internal successors, (63), 57 states have internal predecessors, (63), 25 states have call successors, (25), 11 states have call predecessors, (25), 11 states have return successors, (28), 23 states have call predecessors, (28), 23 states have call successors, (28) [2022-02-15 04:05:04,727 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 116 transitions. [2022-02-15 04:05:04,727 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 116 transitions. Word has length 56 [2022-02-15 04:05:04,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-15 04:05:04,728 INFO L470 AbstractCegarLoop]: Abstraction has 92 states and 116 transitions. [2022-02-15 04:05:04,728 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 2.6666666666666665) internal successors, (32), 7 states have internal predecessors, (32), 6 states have call successors, (12), 7 states have call predecessors, (12), 3 states have return successors, (9), 6 states have call predecessors, (9), 5 states have call successors, (9) [2022-02-15 04:05:04,728 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 116 transitions. [2022-02-15 04:05:04,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2022-02-15 04:05:04,729 INFO L506 BasicCegarLoop]: Found error trace [2022-02-15 04:05:04,729 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, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-15 04:05:04,729 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-02-15 04:05:04,730 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-15 04:05:04,730 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-15 04:05:04,730 INFO L85 PathProgramCache]: Analyzing trace with hash 921875361, now seen corresponding path program 1 times [2022-02-15 04:05:04,730 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-15 04:05:04,730 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2111309436] [2022-02-15 04:05:04,730 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-15 04:05:04,731 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-15 04:05:04,732 INFO L274 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-02-15 04:05:04,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 04:05:04,772 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-15 04:05:04,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 04:05:04,783 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2022-02-15 04:05:04,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 04:05:04,807 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2022-02-15 04:05:04,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 04:05:04,811 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-15 04:05:04,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 04:05:04,814 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2022-02-15 04:05:04,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 04:05:04,829 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2022-02-15 04:05:04,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 04:05:04,835 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-02-15 04:05:04,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 04:05:04,837 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2022-02-15 04:05:04,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 04:05:04,839 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 45 [2022-02-15 04:05:04,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 04:05:04,848 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 51 [2022-02-15 04:05:04,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 04:05:04,861 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 56 [2022-02-15 04:05:04,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 04:05:04,876 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-02-15 04:05:04,876 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-15 04:05:04,876 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2111309436] [2022-02-15 04:05:04,876 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [2111309436] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-15 04:05:04,877 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-15 04:05:04,877 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2022-02-15 04:05:04,877 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [227909903] [2022-02-15 04:05:04,877 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-15 04:05:04,877 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-02-15 04:05:04,877 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-15 04:05:04,877 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-02-15 04:05:04,878 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=130, Unknown=0, NotChecked=0, Total=156 [2022-02-15 04:05:04,878 INFO L87 Difference]: Start difference. First operand 92 states and 116 transitions. Second operand has 13 states, 11 states have (on average 3.090909090909091) internal successors, (34), 7 states have internal predecessors, (34), 5 states have call successors, (14), 7 states have call predecessors, (14), 3 states have return successors, (11), 4 states have call predecessors, (11), 4 states have call successors, (11) [2022-02-15 04:05:05,386 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-15 04:05:05,386 INFO L93 Difference]: Finished difference Result 163 states and 208 transitions. [2022-02-15 04:05:05,386 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-02-15 04:05:05,386 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 11 states have (on average 3.090909090909091) internal successors, (34), 7 states have internal predecessors, (34), 5 states have call successors, (14), 7 states have call predecessors, (14), 3 states have return successors, (11), 4 states have call predecessors, (11), 4 states have call successors, (11) Word has length 66 [2022-02-15 04:05:05,387 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-15 04:05:05,388 INFO L225 Difference]: With dead ends: 163 [2022-02-15 04:05:05,388 INFO L226 Difference]: Without dead ends: 98 [2022-02-15 04:05:05,388 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=108, Invalid=444, Unknown=0, NotChecked=0, Total=552 [2022-02-15 04:05:05,389 INFO L933 BasicCegarLoop]: 68 mSDtfsCounter, 168 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 826 mSolverCounterSat, 164 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 170 SdHoareTripleChecker+Valid, 82 SdHoareTripleChecker+Invalid, 990 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 164 IncrementalHoareTripleChecker+Valid, 826 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-02-15 04:05:05,389 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [170 Valid, 82 Invalid, 990 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [164 Valid, 826 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-02-15 04:05:05,390 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2022-02-15 04:05:05,398 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 94. [2022-02-15 04:05:05,398 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 56 states have (on average 1.1428571428571428) internal successors, (64), 59 states have internal predecessors, (64), 25 states have call successors, (25), 11 states have call predecessors, (25), 12 states have return successors, (30), 23 states have call predecessors, (30), 23 states have call successors, (30) [2022-02-15 04:05:05,399 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 119 transitions. [2022-02-15 04:05:05,399 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 119 transitions. Word has length 66 [2022-02-15 04:05:05,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-15 04:05:05,400 INFO L470 AbstractCegarLoop]: Abstraction has 94 states and 119 transitions. [2022-02-15 04:05:05,400 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 11 states have (on average 3.090909090909091) internal successors, (34), 7 states have internal predecessors, (34), 5 states have call successors, (14), 7 states have call predecessors, (14), 3 states have return successors, (11), 4 states have call predecessors, (11), 4 states have call successors, (11) [2022-02-15 04:05:05,400 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 119 transitions. [2022-02-15 04:05:05,401 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-02-15 04:05:05,401 INFO L506 BasicCegarLoop]: Found error trace [2022-02-15 04:05:05,401 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, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-15 04:05:05,402 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-02-15 04:05:05,402 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-15 04:05:05,402 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-15 04:05:05,402 INFO L85 PathProgramCache]: Analyzing trace with hash 940648973, now seen corresponding path program 1 times [2022-02-15 04:05:05,402 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-15 04:05:05,402 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [810986600] [2022-02-15 04:05:05,402 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-15 04:05:05,403 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-15 04:05:05,404 INFO L274 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-02-15 04:05:05,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 04:05:05,448 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-15 04:05:05,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 04:05:05,459 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2022-02-15 04:05:05,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 04:05:05,481 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2022-02-15 04:05:05,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 04:05:05,485 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-15 04:05:05,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 04:05:05,488 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2022-02-15 04:05:05,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 04:05:05,494 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-02-15 04:05:05,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 04:05:05,496 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2022-02-15 04:05:05,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 04:05:05,498 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 40 [2022-02-15 04:05:05,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 04:05:05,503 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-02-15 04:05:05,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 04:05:05,505 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2022-02-15 04:05:05,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 04:05:05,507 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 58 [2022-02-15 04:05:05,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 04:05:05,514 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 64 [2022-02-15 04:05:05,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 04:05:05,526 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 69 [2022-02-15 04:05:05,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 04:05:05,544 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-02-15 04:05:05,544 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-15 04:05:05,544 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [810986600] [2022-02-15 04:05:05,544 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [810986600] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-15 04:05:05,544 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-15 04:05:05,544 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2022-02-15 04:05:05,544 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2113189982] [2022-02-15 04:05:05,544 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-15 04:05:05,545 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-02-15 04:05:05,545 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-15 04:05:05,545 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-02-15 04:05:05,545 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=130, Unknown=0, NotChecked=0, Total=156 [2022-02-15 04:05:05,546 INFO L87 Difference]: Start difference. First operand 94 states and 119 transitions. Second operand has 13 states, 12 states have (on average 3.1666666666666665) internal successors, (38), 7 states have internal predecessors, (38), 5 states have call successors, (16), 7 states have call predecessors, (16), 3 states have return successors, (13), 5 states have call predecessors, (13), 3 states have call successors, (13) [2022-02-15 04:05:06,047 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-15 04:05:06,047 INFO L93 Difference]: Finished difference Result 151 states and 192 transitions. [2022-02-15 04:05:06,047 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-02-15 04:05:06,047 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 3.1666666666666665) internal successors, (38), 7 states have internal predecessors, (38), 5 states have call successors, (16), 7 states have call predecessors, (16), 3 states have return successors, (13), 5 states have call predecessors, (13), 3 states have call successors, (13) Word has length 79 [2022-02-15 04:05:06,048 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-15 04:05:06,049 INFO L225 Difference]: With dead ends: 151 [2022-02-15 04:05:06,049 INFO L226 Difference]: Without dead ends: 98 [2022-02-15 04:05:06,049 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 75 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=114, Invalid=486, Unknown=0, NotChecked=0, Total=600 [2022-02-15 04:05:06,050 INFO L933 BasicCegarLoop]: 68 mSDtfsCounter, 196 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 786 mSolverCounterSat, 187 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 196 SdHoareTripleChecker+Valid, 82 SdHoareTripleChecker+Invalid, 973 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 187 IncrementalHoareTripleChecker+Valid, 786 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-02-15 04:05:06,050 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [196 Valid, 82 Invalid, 973 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [187 Valid, 786 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-02-15 04:05:06,051 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2022-02-15 04:05:06,058 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 96. [2022-02-15 04:05:06,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 57 states have (on average 1.1403508771929824) internal successors, (65), 61 states have internal predecessors, (65), 25 states have call successors, (25), 11 states have call predecessors, (25), 13 states have return successors, (33), 23 states have call predecessors, (33), 23 states have call successors, (33) [2022-02-15 04:05:06,060 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 123 transitions. [2022-02-15 04:05:06,060 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 123 transitions. Word has length 79 [2022-02-15 04:05:06,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-15 04:05:06,060 INFO L470 AbstractCegarLoop]: Abstraction has 96 states and 123 transitions. [2022-02-15 04:05:06,060 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 3.1666666666666665) internal successors, (38), 7 states have internal predecessors, (38), 5 states have call successors, (16), 7 states have call predecessors, (16), 3 states have return successors, (13), 5 states have call predecessors, (13), 3 states have call successors, (13) [2022-02-15 04:05:06,060 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 123 transitions. [2022-02-15 04:05:06,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2022-02-15 04:05:06,061 INFO L506 BasicCegarLoop]: Found error trace [2022-02-15 04:05:06,061 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, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-15 04:05:06,062 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-02-15 04:05:06,062 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-15 04:05:06,062 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-15 04:05:06,062 INFO L85 PathProgramCache]: Analyzing trace with hash 1677199096, now seen corresponding path program 1 times [2022-02-15 04:05:06,062 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-15 04:05:06,062 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2054951745] [2022-02-15 04:05:06,062 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-15 04:05:06,063 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-15 04:05:06,064 INFO L274 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-02-15 04:05:06,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-02-15 04:05:06,088 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-02-15 04:05:06,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-02-15 04:05:06,161 INFO L138 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2022-02-15 04:05:06,161 INFO L628 BasicCegarLoop]: Counterexample is feasible [2022-02-15 04:05:06,163 INFO L764 garLoopResultBuilder]: Registering result UNSAFE for location __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2022-02-15 04:05:06,164 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2022-02-15 04:05:06,167 INFO L732 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1, 1, 1] [2022-02-15 04:05:06,169 INFO L180 ceAbstractionStarter]: Computing trace abstraction results [2022-02-15 04:05:06,179 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 15.02 04:05:06 BoogieIcfgContainer [2022-02-15 04:05:06,179 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2022-02-15 04:05:06,180 INFO L158 Benchmark]: Toolchain (without parser) took 4318.22ms. Allocated memory was 228.6MB in the beginning and 299.9MB in the end (delta: 71.3MB). Free memory was 174.2MB in the beginning and 122.3MB in the end (delta: 51.9MB). Peak memory consumption was 124.2MB. Max. memory is 8.0GB. [2022-02-15 04:05:06,180 INFO L158 Benchmark]: CDTParser took 0.10ms. Allocated memory is still 228.6MB. Free memory is still 190.8MB. There was no memory consumed. Max. memory is 8.0GB. [2022-02-15 04:05:06,180 INFO L158 Benchmark]: CACSL2BoogieTranslator took 345.23ms. Allocated memory is still 228.6MB. Free memory was 173.9MB in the beginning and 197.8MB in the end (delta: -23.9MB). Peak memory consumption was 10.9MB. Max. memory is 8.0GB. [2022-02-15 04:05:06,180 INFO L158 Benchmark]: Boogie Preprocessor took 34.36ms. Allocated memory is still 228.6MB. Free memory was 197.8MB in the beginning and 195.2MB in the end (delta: 2.6MB). Peak memory consumption was 2.1MB. Max. memory is 8.0GB. [2022-02-15 04:05:06,180 INFO L158 Benchmark]: RCFGBuilder took 334.19ms. Allocated memory is still 228.6MB. Free memory was 195.2MB in the beginning and 176.4MB in the end (delta: 18.9MB). Peak memory consumption was 18.9MB. Max. memory is 8.0GB. [2022-02-15 04:05:06,181 INFO L158 Benchmark]: TraceAbstraction took 3600.83ms. Allocated memory was 228.6MB in the beginning and 299.9MB in the end (delta: 71.3MB). Free memory was 175.8MB in the beginning and 122.3MB in the end (delta: 53.5MB). Peak memory consumption was 125.8MB. Max. memory is 8.0GB. [2022-02-15 04:05:06,182 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.10ms. Allocated memory is still 228.6MB. Free memory is still 190.8MB. There was no memory consumed. Max. memory is 8.0GB. * CACSL2BoogieTranslator took 345.23ms. Allocated memory is still 228.6MB. Free memory was 173.9MB in the beginning and 197.8MB in the end (delta: -23.9MB). Peak memory consumption was 10.9MB. Max. memory is 8.0GB. * Boogie Preprocessor took 34.36ms. Allocated memory is still 228.6MB. Free memory was 197.8MB in the beginning and 195.2MB in the end (delta: 2.6MB). Peak memory consumption was 2.1MB. Max. memory is 8.0GB. * RCFGBuilder took 334.19ms. Allocated memory is still 228.6MB. Free memory was 195.2MB in the beginning and 176.4MB in the end (delta: 18.9MB). Peak memory consumption was 18.9MB. Max. memory is 8.0GB. * TraceAbstraction took 3600.83ms. Allocated memory was 228.6MB in the beginning and 299.9MB in the end (delta: 71.3MB). Free memory was 175.8MB in the beginning and 122.3MB in the end (delta: 53.5MB). Peak memory consumption was 125.8MB. Max. memory is 8.0GB. * 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: [L105] 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; [L30] RET, EXPR nondet_tree() [L30] n->left = nondet_tree() [L31] CALL, EXPR nondet_tree() [L25] COND TRUE __VERIFIER_nondet_bool() [L26] return 0; [L31] RET, EXPR nondet_tree() [L31] n->right = nondet_tree() [L32] return n; [L105] RET, EXPR nondet_tree() [L105] CALL task(nondet_tree()) [L83] CALL, EXPR min(t) [L37] COND FALSE !(!n) [L40] EXPR n->left [L40] CALL, EXPR min(n->left) [L37] COND TRUE !n [L38] return 2147483647; [L40] RET, EXPR min(n->left) [L40] int a = min(n->left); [L41] EXPR n->right [L41] CALL, EXPR min(n->right) [L37] COND TRUE !n [L38] return 2147483647; [L41] RET, EXPR min(n->right) [L41] int b = min(n->right); [L42] COND TRUE a <= b [L42] return a; [L83] RET, EXPR min(t) [L83] int a = min(t); [L84] int b; [L86] CALL, EXPR size(t) [L78] COND FALSE !(!t) [L79] EXPR t->left [L79] CALL, EXPR size(t->left) [L78] COND TRUE !t [L78] return 0; [L79] RET, EXPR size(t->left) [L79] EXPR t->right [L79] CALL, EXPR size(t->right) [L78] COND TRUE !t [L78] return 0; [L79] RET, EXPR size(t->right) [L79] return size(t->left) + size(t->right) + 1; [L86] RET, EXPR size(t) [L86] int n = size(t); [L87] CALL assume_abort_if_not(n != 0) [L10] COND FALSE !(!cond) [L87] RET assume_abort_if_not(n != 0) [L88] EXPR, FCALL calloc(n, sizeof(int)) [L88] int *x = calloc(n, sizeof(int)); [L89] CALL tree_inorder(t, x, n) [L67] COND FALSE !(!t) [L70] EXPR t->left [L70] CALL, EXPR tree_inorder(t->left, a, i) [L67] COND TRUE !t [L68] return i; [L70] RET, EXPR tree_inorder(t->left, a, i) [L70] i = tree_inorder(t->left, a, i) [L71] EXPR i++ [L71] EXPR t->data [L71] a[i++] = t->data [L72] EXPR t->right [L72] CALL, EXPR tree_inorder(t->right, a, i) [L67] COND TRUE !t [L68] return i; [L72] RET, EXPR tree_inorder(t->right, a, i) [L72] i = tree_inorder(t->right, a, i) [L73] return i; [L89] RET tree_inorder(t, x, n) [L90] EXPR x[0] [L90] CALL __VERIFIER_assert(a == x[0]) [L16] COND TRUE !cond [L16] reach_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 13 procedures, 99 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 3.5s, OverallIterations: 6, TraceHistogramMax: 3, PathProgramHistogramMax: 1, EmptinessCheckTime: 0.0s, AutomataDifference: 2.5s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, PartialOrderReductionTime: 0.0s, HoareTripleCheckerStatistics: 0 mSolverCounterUnknown, 859 SdHoareTripleChecker+Valid, 1.7s IncrementalHoareTripleChecker+Time, 0 mSdLazyCounter, 804 mSDsluCounter, 407 SdHoareTripleChecker+Invalid, 1.4s Time, 0 mProtectedAction, 0 SdHoareTripleChecker+Unchecked, 0 IncrementalHoareTripleChecker+Unchecked, 54 mSDsCounter, 779 IncrementalHoareTripleChecker+Valid, 0 mProtectedPredicate, 3216 IncrementalHoareTripleChecker+Invalid, 3995 SdHoareTripleChecker+Unknown, 0 mSolverCounterNotChecked, 779 mSolverCounterUnsat, 353 mSDtfsCounter, 3216 mSolverCounterSat, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Unknown, PredicateUnifierStatistics: 0 DeclaredPredicates, 175 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 183 ImplicationChecksByTransitivity, 0.7s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=96occurred in iteration=0, InterpolantAutomatonStates: 61, 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, 24 StatesRemovedByMinimization, 5 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: No data available, 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! [2022-02-15 04:05:06,204 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...