/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/acceleratedInterpolationJordan_32.epf -i ../../../trunk/examples/svcomp/verifythis/tree_del_iter.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-34549b5 [2022-04-06 15:06:07,236 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-04-06 15:06:07,238 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-04-06 15:06:07,272 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-04-06 15:06:07,273 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-04-06 15:06:07,274 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-04-06 15:06:07,277 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-04-06 15:06:07,283 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-04-06 15:06:07,284 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-04-06 15:06:07,289 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-04-06 15:06:07,290 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-04-06 15:06:07,291 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-04-06 15:06:07,292 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-04-06 15:06:07,295 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-04-06 15:06:07,296 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-04-06 15:06:07,299 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-04-06 15:06:07,300 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-04-06 15:06:07,301 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-04-06 15:06:07,303 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-04-06 15:06:07,308 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-04-06 15:06:07,310 INFO L181 SettingsManager]: Resetting HornVerifier preferences to default values [2022-04-06 15:06:07,312 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-04-06 15:06:07,313 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-04-06 15:06:07,313 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-04-06 15:06:07,315 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-04-06 15:06:07,321 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2022-04-06 15:06:07,331 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-04-06 15:06:07,331 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-04-06 15:06:07,333 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-04-06 15:06:07,334 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf [2022-04-06 15:06:07,346 INFO L113 SettingsManager]: Loading preferences was successful [2022-04-06 15:06:07,346 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-04-06 15:06:07,348 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-04-06 15:06:07,348 INFO L138 SettingsManager]: * sizeof long=4 [2022-04-06 15:06:07,348 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-04-06 15:06:07,348 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-04-06 15:06:07,348 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-04-06 15:06:07,348 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-04-06 15:06:07,348 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-04-06 15:06:07,349 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-04-06 15:06:07,349 INFO L138 SettingsManager]: * sizeof long double=12 [2022-04-06 15:06:07,349 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-04-06 15:06:07,350 INFO L138 SettingsManager]: * Use constant arrays=true [2022-04-06 15:06:07,350 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-04-06 15:06:07,350 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-04-06 15:06:07,350 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-04-06 15:06:07,350 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-04-06 15:06:07,350 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-04-06 15:06:07,350 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-04-06 15:06:07,350 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-04-06 15:06:07,350 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=Craig_NestedInterpolation [2022-04-06 15:06:07,351 INFO L138 SettingsManager]: * Trace refinement strategy=ACCELERATED_INTERPOLATION [2022-04-06 15:06:07,351 INFO L138 SettingsManager]: * Trace refinement strategy used in Accelerated Interpolation=CAMEL [2022-04-06 15:06:07,351 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-04-06 15:06:07,351 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2022-04-06 15:06:07,351 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-04-06 15:06:07,602 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-04-06 15:06:07,631 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-04-06 15:06:07,633 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-04-06 15:06:07,634 INFO L271 PluginConnector]: Initializing CDTParser... [2022-04-06 15:06:07,635 INFO L275 PluginConnector]: CDTParser initialized [2022-04-06 15:06:07,636 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/verifythis/tree_del_iter.c [2022-04-06 15:06:07,701 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f2af66436/284294210fb34bbeb08f6c73c24f9e6b/FLAGe455dc1d8 [2022-04-06 15:06:08,158 INFO L306 CDTParser]: Found 1 translation units. [2022-04-06 15:06:08,158 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/verifythis/tree_del_iter.c [2022-04-06 15:06:08,165 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f2af66436/284294210fb34bbeb08f6c73c24f9e6b/FLAGe455dc1d8 [2022-04-06 15:06:08,183 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f2af66436/284294210fb34bbeb08f6c73c24f9e6b [2022-04-06 15:06:08,185 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-04-06 15:06:08,186 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-04-06 15:06:08,189 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-04-06 15:06:08,189 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-04-06 15:06:08,193 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-04-06 15:06:08,194 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.04 03:06:08" (1/1) ... [2022-04-06 15:06:08,196 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@17e1f104 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 03:06:08, skipping insertion in model container [2022-04-06 15:06:08,196 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.04 03:06:08" (1/1) ... [2022-04-06 15:06:08,203 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-04-06 15:06:08,219 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-04-06 15:06:08,420 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.c[586,599] [2022-04-06 15:06:08,457 WARN L1550 CHandler]: Possible shadowing of function min [2022-04-06 15:06:08,481 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-04-06 15:06:08,495 INFO L203 MainTranslator]: Completed pre-run [2022-04-06 15:06:08,510 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.c[586,599] [2022-04-06 15:06:08,533 WARN L1550 CHandler]: Possible shadowing of function min [2022-04-06 15:06:08,540 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-04-06 15:06:08,557 INFO L208 MainTranslator]: Completed translation [2022-04-06 15:06:08,557 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 03:06:08 WrapperNode [2022-04-06 15:06:08,557 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-04-06 15:06:08,559 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-04-06 15:06:08,560 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-04-06 15:06:08,560 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-04-06 15:06:08,571 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 03:06:08" (1/1) ... [2022-04-06 15:06:08,572 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 03:06:08" (1/1) ... [2022-04-06 15:06:08,593 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 03:06:08" (1/1) ... [2022-04-06 15:06:08,594 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 03:06:08" (1/1) ... [2022-04-06 15:06:08,624 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 03:06:08" (1/1) ... [2022-04-06 15:06:08,632 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 03:06:08" (1/1) ... [2022-04-06 15:06:08,637 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 03:06:08" (1/1) ... [2022-04-06 15:06:08,639 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-04-06 15:06:08,640 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-04-06 15:06:08,640 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-04-06 15:06:08,640 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-04-06 15:06:08,648 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 03:06:08" (1/1) ... [2022-04-06 15:06:08,655 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-04-06 15:06:08,665 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 15:06:08,685 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) [2022-04-06 15:06:08,715 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 [2022-04-06 15:06:08,739 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-04-06 15:06:08,739 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-04-06 15:06:08,739 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_cycle_if_not [2022-04-06 15:06:08,739 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-04-06 15:06:08,740 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-04-06 15:06:08,740 INFO L138 BoogieDeclarations]: Found implementation of procedure nondet_tree [2022-04-06 15:06:08,741 INFO L138 BoogieDeclarations]: Found implementation of procedure min [2022-04-06 15:06:08,741 INFO L138 BoogieDeclarations]: Found implementation of procedure tree_del [2022-04-06 15:06:08,741 INFO L138 BoogieDeclarations]: Found implementation of procedure tree_inorder [2022-04-06 15:06:08,742 INFO L138 BoogieDeclarations]: Found implementation of procedure size [2022-04-06 15:06:08,742 INFO L138 BoogieDeclarations]: Found implementation of procedure task [2022-04-06 15:06:08,742 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-04-06 15:06:08,743 INFO L138 BoogieDeclarations]: Found implementation of procedure #Ultimate.meminit [2022-04-06 15:06:08,743 INFO L130 BoogieDeclarations]: Found specification of procedure calloc [2022-04-06 15:06:08,743 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2022-04-06 15:06:08,743 INFO L130 BoogieDeclarations]: Found specification of procedure free [2022-04-06 15:06:08,743 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2022-04-06 15:06:08,743 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2022-04-06 15:06:08,743 INFO L130 BoogieDeclarations]: Found specification of procedure assume_cycle_if_not [2022-04-06 15:06:08,743 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-04-06 15:06:08,744 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-04-06 15:06:08,744 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-04-06 15:06:08,744 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-04-06 15:06:08,744 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-04-06 15:06:08,744 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_tree [2022-04-06 15:06:08,744 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2022-04-06 15:06:08,744 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-04-06 15:06:08,744 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2022-04-06 15:06:08,744 INFO L130 BoogieDeclarations]: Found specification of procedure min [2022-04-06 15:06:08,745 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-04-06 15:06:08,745 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2022-04-06 15:06:08,745 INFO L130 BoogieDeclarations]: Found specification of procedure tree_del [2022-04-06 15:06:08,745 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-04-06 15:06:08,745 INFO L130 BoogieDeclarations]: Found specification of procedure tree_inorder [2022-04-06 15:06:08,745 INFO L130 BoogieDeclarations]: Found specification of procedure size [2022-04-06 15:06:08,745 INFO L130 BoogieDeclarations]: Found specification of procedure task [2022-04-06 15:06:08,745 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-04-06 15:06:08,745 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.meminit [2022-04-06 15:06:08,745 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-04-06 15:06:08,746 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-04-06 15:06:08,746 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-04-06 15:06:08,746 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-04-06 15:06:08,881 INFO L234 CfgBuilder]: Building ICFG [2022-04-06 15:06:08,883 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-04-06 15:06:09,264 INFO L275 CfgBuilder]: Performing block encoding [2022-04-06 15:06:09,275 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-04-06 15:06:09,275 INFO L299 CfgBuilder]: Removed 3 assume(true) statements. [2022-04-06 15:06:09,278 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.04 03:06:09 BoogieIcfgContainer [2022-04-06 15:06:09,278 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-04-06 15:06:09,281 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-04-06 15:06:09,281 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-04-06 15:06:09,284 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-04-06 15:06:09,285 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.04 03:06:08" (1/3) ... [2022-04-06 15:06:09,285 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7dd275a7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.04 03:06:09, skipping insertion in model container [2022-04-06 15:06:09,285 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 03:06:08" (2/3) ... [2022-04-06 15:06:09,287 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7dd275a7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.04 03:06:09, skipping insertion in model container [2022-04-06 15:06:09,287 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.04 03:06:09" (3/3) ... [2022-04-06 15:06:09,288 INFO L111 eAbstractionObserver]: Analyzing ICFG tree_del_iter.c [2022-04-06 15:06:09,294 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-04-06 15:06:09,294 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-04-06 15:06:09,343 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-04-06 15:06:09,350 INFO L340 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=Craig_NestedInterpolation, 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 [2022-04-06 15:06:09,351 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-04-06 15:06:09,377 INFO L276 IsEmpty]: Start isEmpty. Operand has 98 states, 60 states have (on average 1.2666666666666666) internal successors, (76), 61 states have internal predecessors, (76), 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) [2022-04-06 15:06:09,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-04-06 15:06:09,390 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 15:06:09,390 INFO L499 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] [2022-04-06 15:06:09,391 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 15:06:09,397 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 15:06:09,398 INFO L85 PathProgramCache]: Analyzing trace with hash -738616471, now seen corresponding path program 1 times [2022-04-06 15:06:09,406 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 15:06:09,406 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [780713783] [2022-04-06 15:06:09,418 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 15:06:09,418 INFO L85 PathProgramCache]: Analyzing trace with hash -738616471, now seen corresponding path program 2 times [2022-04-06 15:06:09,420 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 15:06:09,421 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1855716575] [2022-04-06 15:06:09,421 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 15:06:09,422 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 15:06:09,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 15:06:09,727 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 15:06:09,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 15:06:09,759 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2022-04-06 15:06:09,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 15:06:09,772 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2022-04-06 15:06:09,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 15:06:09,787 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-04-06 15:06:09,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 15:06:09,811 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2022-04-06 15:06:09,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 15:06:09,858 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2022-04-06 15:06:09,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 15:06:09,881 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 34 [2022-04-06 15:06:09,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 15:06:09,894 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-04-06 15:06:09,895 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 15:06:09,895 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1855716575] [2022-04-06 15:06:09,896 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1855716575] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 15:06:09,896 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 15:06:09,897 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-04-06 15:06:09,899 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 15:06:09,899 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [780713783] [2022-04-06 15:06:09,899 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [780713783] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 15:06:09,900 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 15:06:09,900 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-04-06 15:06:09,900 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [751615315] [2022-04-06 15:06:09,901 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 15:06:09,919 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-04-06 15:06:09,919 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 15:06:09,952 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-04-06 15:06:09,953 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2022-04-06 15:06:09,956 INFO L87 Difference]: Start difference. First operand has 98 states, 60 states have (on average 1.2666666666666666) internal successors, (76), 61 states have internal predecessors, (76), 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 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) [2022-04-06 15:06:10,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 15:06:10,711 INFO L93 Difference]: Finished difference Result 174 states and 235 transitions. [2022-04-06 15:06:10,714 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-04-06 15:06:10,715 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 [2022-04-06 15:06:10,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 15:06:10,729 INFO L225 Difference]: With dead ends: 174 [2022-04-06 15:06:10,729 INFO L226 Difference]: Without dead ends: 98 [2022-04-06 15:06:10,735 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=77, Invalid=229, Unknown=0, NotChecked=0, Total=306 [2022-04-06 15:06:10,740 INFO L913 BasicCegarLoop]: 79 mSDtfsCounter, 150 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 736 mSolverCounterSat, 129 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 169 SdHoareTripleChecker+Valid, 97 SdHoareTripleChecker+Invalid, 865 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 129 IncrementalHoareTripleChecker+Valid, 736 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-04-06 15:06:10,745 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [169 Valid, 97 Invalid, 865 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [129 Valid, 736 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-04-06 15:06:10,763 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2022-04-06 15:06:10,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 91. [2022-04-06 15:06:10,808 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 55 states have (on average 1.1636363636363636) internal successors, (64), 56 states have internal predecessors, (64), 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) [2022-04-06 15:06:10,810 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 115 transitions. [2022-04-06 15:06:10,812 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 115 transitions. Word has length 44 [2022-04-06 15:06:10,813 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 15:06:10,813 INFO L478 AbstractCegarLoop]: Abstraction has 91 states and 115 transitions. [2022-04-06 15:06:10,814 INFO L479 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) [2022-04-06 15:06:10,814 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 115 transitions. [2022-04-06 15:06:10,818 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2022-04-06 15:06:10,818 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 15:06:10,819 INFO L499 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] [2022-04-06 15:06:10,820 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-04-06 15:06:10,820 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 15:06:10,821 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 15:06:10,824 INFO L85 PathProgramCache]: Analyzing trace with hash -1232690542, now seen corresponding path program 1 times [2022-04-06 15:06:10,824 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 15:06:10,829 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [662989984] [2022-04-06 15:06:10,830 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 15:06:10,830 INFO L85 PathProgramCache]: Analyzing trace with hash -1232690542, now seen corresponding path program 2 times [2022-04-06 15:06:10,830 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 15:06:10,830 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1629072709] [2022-04-06 15:06:10,831 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 15:06:10,831 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 15:06:10,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 15:06:10,961 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 15:06:10,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 15:06:10,978 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2022-04-06 15:06:10,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 15:06:11,024 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2022-04-06 15:06:11,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 15:06:11,030 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-04-06 15:06:11,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 15:06:11,118 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-04-06 15:06:11,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 15:06:11,124 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2022-04-06 15:06:11,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 15:06:11,129 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 35 [2022-04-06 15:06:11,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 15:06:11,142 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2022-04-06 15:06:11,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 15:06:11,161 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 46 [2022-04-06 15:06:11,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 15:06:11,166 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-04-06 15:06:11,166 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 15:06:11,167 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1629072709] [2022-04-06 15:06:11,167 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1629072709] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 15:06:11,167 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1661858958] [2022-04-06 15:06:11,167 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 15:06:11,167 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 15:06:11,168 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 15:06:11,169 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 15:06:11,170 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-04-06 15:06:11,268 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 15:06:11,268 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 15:06:11,271 INFO L263 TraceCheckSpWp]: Trace formula consists of 280 conjuncts, 25 conjunts are in the unsatisfiable core [2022-04-06 15:06:11,277 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 15:06:11,487 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-04-06 15:06:11,488 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 15:06:11,788 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-04-06 15:06:11,788 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1661858958] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 15:06:11,788 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 15:06:11,788 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 8, 8] total 15 [2022-04-06 15:06:11,789 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 15:06:11,789 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [662989984] [2022-04-06 15:06:11,789 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [662989984] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 15:06:11,790 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 15:06:11,790 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2022-04-06 15:06:11,790 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [524254971] [2022-04-06 15:06:11,790 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 15:06:11,791 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-04-06 15:06:11,791 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 15:06:11,791 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-04-06 15:06:11,792 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=174, Unknown=0, NotChecked=0, Total=210 [2022-04-06 15:06:11,792 INFO L87 Difference]: Start difference. First operand 91 states and 115 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) [2022-04-06 15:06:12,564 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 15:06:12,564 INFO L93 Difference]: Finished difference Result 165 states and 211 transitions. [2022-04-06 15:06:12,564 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-04-06 15:06:12,565 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 [2022-04-06 15:06:12,565 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 15:06:12,568 INFO L225 Difference]: With dead ends: 165 [2022-04-06 15:06:12,568 INFO L226 Difference]: Without dead ends: 97 [2022-04-06 15:06:12,569 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 122 SyntacticMatches, 3 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=118, Invalid=434, Unknown=0, NotChecked=0, Total=552 [2022-04-06 15:06:12,570 INFO L913 BasicCegarLoop]: 72 mSDtfsCounter, 183 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 756 mSolverCounterSat, 175 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 200 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 931 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 175 IncrementalHoareTripleChecker+Valid, 756 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-04-06 15:06:12,570 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [200 Valid, 84 Invalid, 931 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [175 Valid, 756 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-04-06 15:06:12,571 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2022-04-06 15:06:12,586 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 93. [2022-04-06 15:06:12,586 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 56 states have (on average 1.1607142857142858) internal successors, (65), 58 states have internal predecessors, (65), 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) [2022-04-06 15:06:12,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 118 transitions. [2022-04-06 15:06:12,588 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 118 transitions. Word has length 56 [2022-04-06 15:06:12,588 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 15:06:12,588 INFO L478 AbstractCegarLoop]: Abstraction has 93 states and 118 transitions. [2022-04-06 15:06:12,589 INFO L479 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) [2022-04-06 15:06:12,589 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 118 transitions. [2022-04-06 15:06:12,590 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2022-04-06 15:06:12,591 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 15:06:12,591 INFO L499 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] [2022-04-06 15:06:12,623 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-04-06 15:06:12,819 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 15:06:12,820 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 15:06:12,820 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 15:06:12,821 INFO L85 PathProgramCache]: Analyzing trace with hash -1976466705, now seen corresponding path program 1 times [2022-04-06 15:06:12,821 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 15:06:12,821 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [271399942] [2022-04-06 15:06:12,821 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 15:06:12,822 INFO L85 PathProgramCache]: Analyzing trace with hash -1976466705, now seen corresponding path program 2 times [2022-04-06 15:06:12,822 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 15:06:12,822 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1046118997] [2022-04-06 15:06:12,822 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 15:06:12,822 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 15:06:12,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 15:06:12,882 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 15:06:12,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 15:06:12,899 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2022-04-06 15:06:12,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 15:06:12,945 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2022-04-06 15:06:12,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 15:06:12,953 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-04-06 15:06:12,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 15:06:12,963 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2022-04-06 15:06:12,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 15:06:12,985 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2022-04-06 15:06:12,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 15:06:12,995 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-04-06 15:06:12,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 15:06:12,998 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2022-04-06 15:06:12,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 15:06:13,002 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 45 [2022-04-06 15:06:13,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 15:06:13,014 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 51 [2022-04-06 15:06:13,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 15:06:13,033 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 56 [2022-04-06 15:06:13,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 15:06:13,038 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2022-04-06 15:06:13,038 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 15:06:13,038 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1046118997] [2022-04-06 15:06:13,039 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1046118997] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 15:06:13,039 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 15:06:13,039 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2022-04-06 15:06:13,039 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 15:06:13,039 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [271399942] [2022-04-06 15:06:13,039 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [271399942] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 15:06:13,039 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 15:06:13,040 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2022-04-06 15:06:13,040 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [536228390] [2022-04-06 15:06:13,040 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 15:06:13,040 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-04-06 15:06:13,040 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 15:06:13,041 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-04-06 15:06:13,041 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=130, Unknown=0, NotChecked=0, Total=156 [2022-04-06 15:06:13,041 INFO L87 Difference]: Start difference. First operand 93 states and 118 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) [2022-04-06 15:06:13,760 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 15:06:13,761 INFO L93 Difference]: Finished difference Result 164 states and 210 transitions. [2022-04-06 15:06:13,761 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-04-06 15:06:13,761 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 [2022-04-06 15:06:13,762 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 15:06:13,763 INFO L225 Difference]: With dead ends: 164 [2022-04-06 15:06:13,763 INFO L226 Difference]: Without dead ends: 99 [2022-04-06 15:06:13,764 INFO L912 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 [2022-04-06 15:06:13,765 INFO L913 BasicCegarLoop]: 70 mSDtfsCounter, 178 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 796 mSolverCounterSat, 171 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 180 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 967 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 171 IncrementalHoareTripleChecker+Valid, 796 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-04-06 15:06:13,765 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [180 Valid, 84 Invalid, 967 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [171 Valid, 796 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-04-06 15:06:13,766 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2022-04-06 15:06:13,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 95. [2022-04-06 15:06:13,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 57 states have (on average 1.1578947368421053) internal successors, (66), 60 states have internal predecessors, (66), 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) [2022-04-06 15:06:13,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 121 transitions. [2022-04-06 15:06:13,782 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 121 transitions. Word has length 66 [2022-04-06 15:06:13,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 15:06:13,782 INFO L478 AbstractCegarLoop]: Abstraction has 95 states and 121 transitions. [2022-04-06 15:06:13,782 INFO L479 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) [2022-04-06 15:06:13,782 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 121 transitions. [2022-04-06 15:06:13,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-04-06 15:06:13,784 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 15:06:13,784 INFO L499 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] [2022-04-06 15:06:13,785 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-04-06 15:06:13,785 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 15:06:13,785 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 15:06:13,785 INFO L85 PathProgramCache]: Analyzing trace with hash -1818938389, now seen corresponding path program 1 times [2022-04-06 15:06:13,785 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 15:06:13,785 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [676285543] [2022-04-06 15:06:13,786 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 15:06:13,786 INFO L85 PathProgramCache]: Analyzing trace with hash -1818938389, now seen corresponding path program 2 times [2022-04-06 15:06:13,786 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 15:06:13,786 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1466792146] [2022-04-06 15:06:13,786 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 15:06:13,787 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 15:06:13,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 15:06:13,873 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 15:06:13,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 15:06:13,888 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2022-04-06 15:06:13,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 15:06:13,916 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2022-04-06 15:06:13,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 15:06:13,921 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-04-06 15:06:13,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 15:06:13,926 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2022-04-06 15:06:13,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 15:06:13,981 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-04-06 15:06:13,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 15:06:13,986 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2022-04-06 15:06:13,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 15:06:13,999 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 40 [2022-04-06 15:06:14,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 15:06:14,007 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-04-06 15:06:14,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 15:06:14,018 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2022-04-06 15:06:14,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 15:06:14,022 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 58 [2022-04-06 15:06:14,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 15:06:14,040 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 64 [2022-04-06 15:06:14,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 15:06:14,057 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 69 [2022-04-06 15:06:14,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 15:06:14,086 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2022-04-06 15:06:14,087 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 15:06:14,087 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1466792146] [2022-04-06 15:06:14,087 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1466792146] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 15:06:14,087 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1723761253] [2022-04-06 15:06:14,087 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 15:06:14,090 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 15:06:14,090 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 15:06:14,091 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 15:06:14,092 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-04-06 15:06:14,209 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 15:06:14,209 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 15:06:14,212 INFO L263 TraceCheckSpWp]: Trace formula consists of 428 conjuncts, 15 conjunts are in the unsatisfiable core [2022-04-06 15:06:14,221 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 15:06:14,400 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2022-04-06 15:06:14,401 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-04-06 15:06:14,401 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1723761253] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 15:06:14,401 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-04-06 15:06:14,401 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [16] total 20 [2022-04-06 15:06:14,402 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 15:06:14,402 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [676285543] [2022-04-06 15:06:14,402 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [676285543] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 15:06:14,402 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 15:06:14,402 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-04-06 15:06:14,402 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [521046683] [2022-04-06 15:06:14,402 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 15:06:14,403 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-04-06 15:06:14,403 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 15:06:14,403 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-04-06 15:06:14,403 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=340, Unknown=0, NotChecked=0, Total=380 [2022-04-06 15:06:14,404 INFO L87 Difference]: Start difference. First operand 95 states and 121 transitions. Second operand has 9 states, 8 states have (on average 4.75) internal successors, (38), 7 states have internal predecessors, (38), 5 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (13), 5 states have call predecessors, (13), 3 states have call successors, (13) [2022-04-06 15:06:14,536 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 15:06:14,536 INFO L93 Difference]: Finished difference Result 150 states and 192 transitions. [2022-04-06 15:06:14,537 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-04-06 15:06:14,537 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 4.75) internal successors, (38), 7 states have internal predecessors, (38), 5 states have call successors, (16), 3 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 [2022-04-06 15:06:14,537 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 15:06:14,539 INFO L225 Difference]: With dead ends: 150 [2022-04-06 15:06:14,539 INFO L226 Difference]: Without dead ends: 97 [2022-04-06 15:06:14,540 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 96 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=52, Invalid=454, Unknown=0, NotChecked=0, Total=506 [2022-04-06 15:06:14,541 INFO L913 BasicCegarLoop]: 104 mSDtfsCounter, 35 mSDsluCounter, 602 mSDsCounter, 0 mSdLazyCounter, 127 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 706 SdHoareTripleChecker+Invalid, 151 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 127 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-06 15:06:14,541 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [39 Valid, 706 Invalid, 151 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 127 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-06 15:06:14,542 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2022-04-06 15:06:14,556 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 97. [2022-04-06 15:06:14,556 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 58 states have (on average 1.1551724137931034) internal successors, (67), 62 states have internal predecessors, (67), 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) [2022-04-06 15:06:14,557 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 125 transitions. [2022-04-06 15:06:14,558 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 125 transitions. Word has length 79 [2022-04-06 15:06:14,558 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 15:06:14,558 INFO L478 AbstractCegarLoop]: Abstraction has 97 states and 125 transitions. [2022-04-06 15:06:14,558 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 4.75) internal successors, (38), 7 states have internal predecessors, (38), 5 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (13), 5 states have call predecessors, (13), 3 states have call successors, (13) [2022-04-06 15:06:14,558 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 125 transitions. [2022-04-06 15:06:14,560 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2022-04-06 15:06:14,561 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 15:06:14,561 INFO L499 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] [2022-04-06 15:06:14,591 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-04-06 15:06:14,786 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3 [2022-04-06 15:06:14,786 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 15:06:14,787 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 15:06:14,787 INFO L85 PathProgramCache]: Analyzing trace with hash -1854783018, now seen corresponding path program 1 times [2022-04-06 15:06:14,787 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 15:06:14,787 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2081965396] [2022-04-06 15:06:14,787 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 15:06:14,788 INFO L85 PathProgramCache]: Analyzing trace with hash -1854783018, now seen corresponding path program 2 times [2022-04-06 15:06:14,788 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 15:06:14,788 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [585627293] [2022-04-06 15:06:14,788 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 15:06:14,788 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 15:06:14,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-04-06 15:06:14,826 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-04-06 15:06:14,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-04-06 15:06:14,896 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-04-06 15:06:14,897 INFO L130 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found a feasible trace [2022-04-06 15:06:14,897 INFO L618 BasicCegarLoop]: Counterexample is feasible [2022-04-06 15:06:14,900 INFO L788 garLoopResultBuilder]: Registering result UNSAFE for location __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2022-04-06 15:06:14,902 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-04-06 15:06:14,904 INFO L719 BasicCegarLoop]: Path program histogram: [2, 2, 2, 2, 2] [2022-04-06 15:06:14,907 INFO L178 ceAbstractionStarter]: Computing trace abstraction results [2022-04-06 15:06:14,936 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 06.04 03:06:14 BoogieIcfgContainer [2022-04-06 15:06:14,936 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2022-04-06 15:06:14,937 INFO L158 Benchmark]: Toolchain (without parser) took 6750.50ms. Allocated memory was 185.6MB in the beginning and 223.3MB in the end (delta: 37.7MB). Free memory was 134.1MB in the beginning and 107.1MB in the end (delta: 27.0MB). Peak memory consumption was 64.1MB. Max. memory is 8.0GB. [2022-04-06 15:06:14,937 INFO L158 Benchmark]: CDTParser took 0.15ms. Allocated memory is still 185.6MB. Free memory was 150.9MB in the beginning and 150.8MB in the end (delta: 136.4kB). There was no memory consumed. Max. memory is 8.0GB. [2022-04-06 15:06:14,938 INFO L158 Benchmark]: CACSL2BoogieTranslator took 369.11ms. Allocated memory is still 185.6MB. Free memory was 133.8MB in the beginning and 158.3MB in the end (delta: -24.5MB). Peak memory consumption was 11.5MB. Max. memory is 8.0GB. [2022-04-06 15:06:14,938 INFO L158 Benchmark]: Boogie Preprocessor took 80.91ms. Allocated memory is still 185.6MB. Free memory was 158.3MB in the beginning and 156.2MB in the end (delta: 2.1MB). Peak memory consumption was 2.1MB. Max. memory is 8.0GB. [2022-04-06 15:06:14,938 INFO L158 Benchmark]: RCFGBuilder took 638.13ms. Allocated memory is still 185.6MB. Free memory was 156.2MB in the beginning and 136.9MB in the end (delta: 19.3MB). Peak memory consumption was 18.9MB. Max. memory is 8.0GB. [2022-04-06 15:06:14,938 INFO L158 Benchmark]: TraceAbstraction took 5655.12ms. Allocated memory was 185.6MB in the beginning and 223.3MB in the end (delta: 37.7MB). Free memory was 136.7MB in the beginning and 107.1MB in the end (delta: 29.6MB). Peak memory consumption was 68.4MB. Max. memory is 8.0GB. [2022-04-06 15:06:14,940 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.15ms. Allocated memory is still 185.6MB. Free memory was 150.9MB in the beginning and 150.8MB in the end (delta: 136.4kB). There was no memory consumed. Max. memory is 8.0GB. * CACSL2BoogieTranslator took 369.11ms. Allocated memory is still 185.6MB. Free memory was 133.8MB in the beginning and 158.3MB in the end (delta: -24.5MB). Peak memory consumption was 11.5MB. Max. memory is 8.0GB. * Boogie Preprocessor took 80.91ms. Allocated memory is still 185.6MB. Free memory was 158.3MB in the beginning and 156.2MB in the end (delta: 2.1MB). Peak memory consumption was 2.1MB. Max. memory is 8.0GB. * RCFGBuilder took 638.13ms. Allocated memory is still 185.6MB. Free memory was 156.2MB in the beginning and 136.9MB in the end (delta: 19.3MB). Peak memory consumption was 18.9MB. Max. memory is 8.0GB. * TraceAbstraction took 5655.12ms. Allocated memory was 185.6MB in the beginning and 223.3MB in the end (delta: 37.7MB). Free memory was 136.7MB in the beginning and 107.1MB in the end (delta: 29.6MB). Peak memory consumption was 68.4MB. 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: [L110] 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; [L110] RET, EXPR nondet_tree() [L110] CALL task(nondet_tree()) [L86] CALL, EXPR min(t) [L37] COND FALSE !(!n) [L40] EXPR n->data [L40] int a = n->data; [L41] EXPR n->left [L41] CALL, EXPR min(n->left) [L37] COND TRUE !n [L38] return 2147483647; [L41] RET, EXPR min(n->left) [L41] int b = min(n->left); [L42] EXPR n->right [L42] CALL, EXPR min(n->right) [L37] COND TRUE !n [L38] return 2147483647; [L42] RET, EXPR min(n->right) [L42] int c = min(n->right); [L43] COND TRUE b <= a && b <= c [L43] return b; [L86] RET, EXPR min(t) [L86] int a = min(t); [L87] int b; [L89] CALL, EXPR size(t) [L81] COND FALSE !(!t) [L82] EXPR t->left [L82] CALL, EXPR size(t->left) [L81] COND TRUE !t [L81] return 0; [L82] RET, EXPR size(t->left) [L82] EXPR t->right [L82] CALL, EXPR size(t->right) [L81] COND TRUE !t [L81] return 0; [L82] RET, EXPR size(t->right) [L82] return size(t->left) + size(t->right) + 1; [L89] RET, EXPR size(t) [L89] int n = size(t); [L90] CALL assume_cycle_if_not(n != 0) [L9] COND FALSE !(!cond) [L90] RET assume_cycle_if_not(n != 0) [L91] EXPR, FCALL calloc(n, sizeof(int)) [L91] int *x = calloc(n, sizeof(int)); [L92] CALL tree_inorder(t, x, n) [L70] COND FALSE !(!t) [L73] EXPR t->left [L73] CALL, EXPR tree_inorder(t->left, a, i) [L70] COND TRUE !t [L71] return i; [L73] RET, EXPR tree_inorder(t->left, a, i) [L73] i = tree_inorder(t->left, a, i) [L74] EXPR i++ [L74] EXPR t->data [L74] a[i++] = t->data [L75] EXPR t->right [L75] CALL, EXPR tree_inorder(t->right, a, i) [L70] COND TRUE !t [L71] return i; [L75] RET, EXPR tree_inorder(t->right, a, i) [L75] i = tree_inorder(t->right, a, i) [L76] return i; [L92] RET tree_inorder(t, x, n) [L93] EXPR x[0] [L93] CALL __VERIFIER_assert(a == x[0]) [L16] COND TRUE !cond [L16] reach_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 13 procedures, 101 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 5.6s, OverallIterations: 5, TraceHistogramMax: 3, PathProgramHistogramMax: 2, EmptinessCheckTime: 0.0s, AutomataDifference: 2.5s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, PartialOrderReductionTime: 0.0s, HoareTripleCheckerStatistics: 0 mSolverCounterUnknown, 588 SdHoareTripleChecker+Valid, 1.6s IncrementalHoareTripleChecker+Time, 0 mSdLazyCounter, 546 mSDsluCounter, 971 SdHoareTripleChecker+Invalid, 1.3s Time, 0 mProtectedAction, 0 SdHoareTripleChecker+Unchecked, 0 IncrementalHoareTripleChecker+Unchecked, 646 mSDsCounter, 499 IncrementalHoareTripleChecker+Valid, 0 mProtectedPredicate, 2415 IncrementalHoareTripleChecker+Invalid, 2914 SdHoareTripleChecker+Unknown, 0 mSolverCounterNotChecked, 499 mSolverCounterUnsat, 325 mSDtfsCounter, 2415 mSolverCounterSat, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Unknown, PredicateUnifierStatistics: 0 DeclaredPredicates, 335 GetRequests, 251 SyntacticMatches, 3 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 151 ImplicationChecksByTransitivity, 1.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=98occurred in iteration=0, InterpolantAutomatonStates: 48, 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, 4 MinimizatonAttempts, 15 StatesRemovedByMinimization, 3 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! [2022-04-06 15:06:14,974 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...