/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.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-b030c9e [2022-03-20 19:17:55,994 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-03-20 19:17:55,995 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-03-20 19:17:56,017 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-03-20 19:17:56,017 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-03-20 19:17:56,018 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-03-20 19:17:56,019 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-03-20 19:17:56,020 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-03-20 19:17:56,021 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-03-20 19:17:56,021 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-03-20 19:17:56,022 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-03-20 19:17:56,022 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-03-20 19:17:56,023 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-03-20 19:17:56,023 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-03-20 19:17:56,024 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-03-20 19:17:56,024 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-03-20 19:17:56,025 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-03-20 19:17:56,025 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-03-20 19:17:56,026 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-03-20 19:17:56,028 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-03-20 19:17:56,028 INFO L181 SettingsManager]: Resetting HornVerifier preferences to default values [2022-03-20 19:17:56,043 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-03-20 19:17:56,044 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-03-20 19:17:56,045 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-03-20 19:17:56,045 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-03-20 19:17:56,047 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2022-03-20 19:17:56,052 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-03-20 19:17:56,052 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-03-20 19:17:56,053 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-03-20 19:17:56,053 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationQvasr_64.epf [2022-03-20 19:17:56,058 INFO L113 SettingsManager]: Loading preferences was successful [2022-03-20 19:17:56,059 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-03-20 19:17:56,059 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-03-20 19:17:56,060 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-03-20 19:17:56,060 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-03-20 19:17:56,060 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-03-20 19:17:56,060 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-03-20 19:17:56,060 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-03-20 19:17:56,060 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-03-20 19:17:56,060 INFO L138 SettingsManager]: * Use constant arrays=true [2022-03-20 19:17:56,060 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-03-20 19:17:56,060 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-03-20 19:17:56,060 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-03-20 19:17:56,060 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-03-20 19:17:56,060 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-03-20 19:17:56,061 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-20 19:17:56,061 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-03-20 19:17:56,061 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=Craig_NestedInterpolation [2022-03-20 19:17:56,061 INFO L138 SettingsManager]: * Trace refinement strategy=ACCELERATED_INTERPOLATION [2022-03-20 19:17:56,061 INFO L138 SettingsManager]: * Trace refinement strategy used in Accelerated Interpolation=CAMEL [2022-03-20 19:17:56,061 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-03-20 19:17:56,061 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=QVASR [2022-03-20 19:17:56,061 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-03-20 19:17:56,247 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-03-20 19:17:56,263 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-03-20 19:17:56,266 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-03-20 19:17:56,267 INFO L271 PluginConnector]: Initializing CDTParser... [2022-03-20 19:17:56,268 INFO L275 PluginConnector]: CDTParser initialized [2022-03-20 19:17:56,269 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/verifythis/tree_del_iter.c [2022-03-20 19:17:56,331 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/95969ed6a/d6eb19c4a63a48538b2e56156fbeccd7/FLAGa330cf10f [2022-03-20 19:17:56,636 INFO L306 CDTParser]: Found 1 translation units. [2022-03-20 19:17:56,637 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/verifythis/tree_del_iter.c [2022-03-20 19:17:56,641 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/95969ed6a/d6eb19c4a63a48538b2e56156fbeccd7/FLAGa330cf10f [2022-03-20 19:17:56,649 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/95969ed6a/d6eb19c4a63a48538b2e56156fbeccd7 [2022-03-20 19:17:56,650 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-03-20 19:17:56,651 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-03-20 19:17:56,652 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-03-20 19:17:56,652 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-03-20 19:17:56,654 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-03-20 19:17:56,654 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.03 07:17:56" (1/1) ... [2022-03-20 19:17:56,655 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@599d32d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 07:17:56, skipping insertion in model container [2022-03-20 19:17:56,655 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.03 07:17:56" (1/1) ... [2022-03-20 19:17:56,664 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-03-20 19:17:56,680 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-03-20 19:17:56,805 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] [2022-03-20 19:17:56,818 WARN L1550 CHandler]: Possible shadowing of function min [2022-03-20 19:17:56,825 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-20 19:17:56,832 INFO L203 MainTranslator]: Completed pre-run [2022-03-20 19:17:56,839 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] [2022-03-20 19:17:56,844 WARN L1550 CHandler]: Possible shadowing of function min [2022-03-20 19:17:56,852 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-20 19:17:56,862 INFO L208 MainTranslator]: Completed translation [2022-03-20 19:17:56,862 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 07:17:56 WrapperNode [2022-03-20 19:17:56,862 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-03-20 19:17:56,863 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-03-20 19:17:56,863 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-03-20 19:17:56,863 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-03-20 19:17:56,872 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 07:17:56" (1/1) ... [2022-03-20 19:17:56,872 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 07:17:56" (1/1) ... [2022-03-20 19:17:56,880 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 07:17:56" (1/1) ... [2022-03-20 19:17:56,880 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 07:17:56" (1/1) ... [2022-03-20 19:17:56,889 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 07:17:56" (1/1) ... [2022-03-20 19:17:56,892 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 07:17:56" (1/1) ... [2022-03-20 19:17:56,894 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 07:17:56" (1/1) ... [2022-03-20 19:17:56,896 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-03-20 19:17:56,896 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-03-20 19:17:56,896 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-03-20 19:17:56,896 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-03-20 19:17:56,897 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 07:17:56" (1/1) ... [2022-03-20 19:17:56,917 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-20 19:17:56,923 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 19:17:56,936 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) [2022-03-20 19:17:56,939 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 [2022-03-20 19:17:56,960 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-03-20 19:17:56,960 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-03-20 19:17:56,960 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_cycle_if_not [2022-03-20 19:17:56,960 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-03-20 19:17:56,960 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-03-20 19:17:56,960 INFO L138 BoogieDeclarations]: Found implementation of procedure nondet_tree [2022-03-20 19:17:56,960 INFO L138 BoogieDeclarations]: Found implementation of procedure min [2022-03-20 19:17:56,960 INFO L138 BoogieDeclarations]: Found implementation of procedure tree_del [2022-03-20 19:17:56,960 INFO L138 BoogieDeclarations]: Found implementation of procedure tree_inorder [2022-03-20 19:17:56,961 INFO L138 BoogieDeclarations]: Found implementation of procedure size [2022-03-20 19:17:56,961 INFO L138 BoogieDeclarations]: Found implementation of procedure task [2022-03-20 19:17:56,961 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-03-20 19:17:56,961 INFO L138 BoogieDeclarations]: Found implementation of procedure #Ultimate.meminit [2022-03-20 19:17:56,961 INFO L130 BoogieDeclarations]: Found specification of procedure calloc [2022-03-20 19:17:56,961 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2022-03-20 19:17:56,961 INFO L130 BoogieDeclarations]: Found specification of procedure free [2022-03-20 19:17:56,961 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2022-03-20 19:17:56,961 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2022-03-20 19:17:56,961 INFO L130 BoogieDeclarations]: Found specification of procedure assume_cycle_if_not [2022-03-20 19:17:56,961 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-03-20 19:17:56,961 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-03-20 19:17:56,961 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-03-20 19:17:56,962 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-03-20 19:17:56,962 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-03-20 19:17:56,962 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_tree [2022-03-20 19:17:56,962 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2022-03-20 19:17:56,962 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-03-20 19:17:56,962 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2022-03-20 19:17:56,962 INFO L130 BoogieDeclarations]: Found specification of procedure min [2022-03-20 19:17:56,962 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-03-20 19:17:56,962 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2022-03-20 19:17:56,962 INFO L130 BoogieDeclarations]: Found specification of procedure tree_del [2022-03-20 19:17:56,962 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-03-20 19:17:56,962 INFO L130 BoogieDeclarations]: Found specification of procedure tree_inorder [2022-03-20 19:17:56,962 INFO L130 BoogieDeclarations]: Found specification of procedure size [2022-03-20 19:17:56,963 INFO L130 BoogieDeclarations]: Found specification of procedure task [2022-03-20 19:17:56,963 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-03-20 19:17:56,963 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.meminit [2022-03-20 19:17:56,963 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-03-20 19:17:56,963 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-03-20 19:17:56,963 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-03-20 19:17:56,963 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-03-20 19:17:57,063 INFO L234 CfgBuilder]: Building ICFG [2022-03-20 19:17:57,064 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-03-20 19:17:57,286 INFO L275 CfgBuilder]: Performing block encoding [2022-03-20 19:17:57,292 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-03-20 19:17:57,292 INFO L299 CfgBuilder]: Removed 3 assume(true) statements. [2022-03-20 19:17:57,294 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.03 07:17:57 BoogieIcfgContainer [2022-03-20 19:17:57,294 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-03-20 19:17:57,295 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-03-20 19:17:57,295 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-03-20 19:17:57,297 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-03-20 19:17:57,297 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.03 07:17:56" (1/3) ... [2022-03-20 19:17:57,298 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5e6e3f7c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.03 07:17:57, skipping insertion in model container [2022-03-20 19:17:57,298 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.03 07:17:56" (2/3) ... [2022-03-20 19:17:57,298 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5e6e3f7c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.03 07:17:57, skipping insertion in model container [2022-03-20 19:17:57,298 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.03 07:17:57" (3/3) ... [2022-03-20 19:17:57,299 INFO L111 eAbstractionObserver]: Analyzing ICFG tree_del_iter.c [2022-03-20 19:17:57,302 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-03-20 19:17:57,302 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-03-20 19:17:57,345 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-03-20 19:17:57,350 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 [2022-03-20 19:17:57,351 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-03-20 19:17:57,374 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) [2022-03-20 19:17:57,383 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-03-20 19:17:57,384 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:17:57,384 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] [2022-03-20 19:17:57,385 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:17:57,388 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:17:57,389 INFO L85 PathProgramCache]: Analyzing trace with hash -738616471, now seen corresponding path program 1 times [2022-03-20 19:17:57,395 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:17:57,395 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1367707221] [2022-03-20 19:17:57,403 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 19:17:57,403 INFO L85 PathProgramCache]: Analyzing trace with hash -738616471, now seen corresponding path program 2 times [2022-03-20 19:17:57,405 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:17:57,405 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1382384133] [2022-03-20 19:17:57,406 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:17:57,407 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:17:57,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:17:57,588 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:17:57,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:17:57,607 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2022-03-20 19:17:57,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:17:57,614 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2022-03-20 19:17:57,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:17:57,620 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-03-20 19:17:57,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:17:57,636 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2022-03-20 19:17:57,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:17:57,684 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2022-03-20 19:17:57,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:17:57,706 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 34 [2022-03-20 19:17:57,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:17:57,725 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-20 19:17:57,725 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:17:57,725 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1382384133] [2022-03-20 19:17:57,726 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1382384133] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:17:57,726 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:17:57,726 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-03-20 19:17:57,728 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:17:57,728 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1367707221] [2022-03-20 19:17:57,728 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1367707221] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:17:57,728 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:17:57,728 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-03-20 19:17:57,729 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [12790437] [2022-03-20 19:17:57,729 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:17:57,732 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-03-20 19:17:57,732 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:17:57,756 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-03-20 19:17:57,756 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2022-03-20 19:17:57,758 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) [2022-03-20 19:17:58,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:17:58,342 INFO L93 Difference]: Finished difference Result 174 states and 235 transitions. [2022-03-20 19:17:58,343 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-03-20 19:17:58,348 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 [2022-03-20 19:17:58,349 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:17:58,359 INFO L225 Difference]: With dead ends: 174 [2022-03-20 19:17:58,359 INFO L226 Difference]: Without dead ends: 98 [2022-03-20 19:17:58,365 INFO L912 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 [2022-03-20 19:17:58,368 INFO L913 BasicCegarLoop]: 79 mSDtfsCounter, 150 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 736 mSolverCounterSat, 129 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s 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, 0.4s IncrementalHoareTripleChecker+Time [2022-03-20 19:17:58,372 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [169 Valid, 97 Invalid, 865 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [129 Valid, 736 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-03-20 19:17:58,384 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2022-03-20 19:17:58,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 91. [2022-03-20 19:17:58,431 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) [2022-03-20 19:17:58,439 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 115 transitions. [2022-03-20 19:17:58,441 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 115 transitions. Word has length 44 [2022-03-20 19:17:58,442 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:17:58,442 INFO L478 AbstractCegarLoop]: Abstraction has 91 states and 115 transitions. [2022-03-20 19:17:58,442 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) [2022-03-20 19:17:58,442 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 115 transitions. [2022-03-20 19:17:58,446 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2022-03-20 19:17:58,446 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:17:58,446 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] [2022-03-20 19:17:58,446 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-03-20 19:17:58,446 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:17:58,447 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:17:58,447 INFO L85 PathProgramCache]: Analyzing trace with hash -1232690542, now seen corresponding path program 1 times [2022-03-20 19:17:58,448 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:17:58,448 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1165399954] [2022-03-20 19:17:58,451 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 19:17:58,451 INFO L85 PathProgramCache]: Analyzing trace with hash -1232690542, now seen corresponding path program 2 times [2022-03-20 19:17:58,455 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:17:58,455 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1676616954] [2022-03-20 19:17:58,455 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:17:58,456 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:17:58,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:17:58,547 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:17:58,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:17:58,562 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2022-03-20 19:17:58,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:17:58,588 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2022-03-20 19:17:58,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:17:58,597 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2022-03-20 19:17:58,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:17:58,656 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-03-20 19:17:58,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:17:58,661 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2022-03-20 19:17:58,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:17:58,671 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 35 [2022-03-20 19:17:58,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:17:58,686 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2022-03-20 19:17:58,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:17:58,701 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 46 [2022-03-20 19:17:58,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:17:58,706 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-20 19:17:58,707 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:17:58,707 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1676616954] [2022-03-20 19:17:58,707 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1676616954] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 19:17:58,707 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1755874282] [2022-03-20 19:17:58,707 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 19:17:58,708 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:17:58,708 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 19:17:58,712 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) [2022-03-20 19:17:58,739 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-03-20 19:17:58,811 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 19:17:58,811 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 19:17:58,820 INFO L263 TraceCheckSpWp]: Trace formula consists of 280 conjuncts, 25 conjunts are in the unsatisfiable core [2022-03-20 19:17:58,824 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 19:17:59,070 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-20 19:17:59,070 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-20 19:17:59,271 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-20 19:17:59,272 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1755874282] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-20 19:17:59,272 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-20 19:17:59,272 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 8, 8] total 15 [2022-03-20 19:17:59,273 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:17:59,273 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1165399954] [2022-03-20 19:17:59,273 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1165399954] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:17:59,273 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:17:59,273 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2022-03-20 19:17:59,273 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1836823529] [2022-03-20 19:17:59,273 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:17:59,274 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-03-20 19:17:59,274 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:17:59,274 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-03-20 19:17:59,274 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=174, Unknown=0, NotChecked=0, Total=210 [2022-03-20 19:17:59,275 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) [2022-03-20 19:17:59,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:17:59,870 INFO L93 Difference]: Finished difference Result 165 states and 211 transitions. [2022-03-20 19:17:59,870 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-03-20 19:17:59,870 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 [2022-03-20 19:17:59,870 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:17:59,872 INFO L225 Difference]: With dead ends: 165 [2022-03-20 19:17:59,872 INFO L226 Difference]: Without dead ends: 97 [2022-03-20 19:17:59,872 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 [2022-03-20 19:17:59,873 INFO L913 BasicCegarLoop]: 72 mSDtfsCounter, 183 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 756 mSolverCounterSat, 175 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s 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, 0.4s IncrementalHoareTripleChecker+Time [2022-03-20 19:17:59,888 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [200 Valid, 84 Invalid, 931 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [175 Valid, 756 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-03-20 19:17:59,891 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2022-03-20 19:17:59,912 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 93. [2022-03-20 19:17:59,913 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) [2022-03-20 19:17:59,914 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 118 transitions. [2022-03-20 19:17:59,914 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 118 transitions. Word has length 56 [2022-03-20 19:17:59,914 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:17:59,914 INFO L478 AbstractCegarLoop]: Abstraction has 93 states and 118 transitions. [2022-03-20 19:17:59,914 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) [2022-03-20 19:17:59,914 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 118 transitions. [2022-03-20 19:17:59,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2022-03-20 19:17:59,916 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:17:59,916 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] [2022-03-20 19:17:59,936 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-03-20 19:18:00,135 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 [2022-03-20 19:18:00,135 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:18:00,136 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:18:00,136 INFO L85 PathProgramCache]: Analyzing trace with hash -1976466705, now seen corresponding path program 1 times [2022-03-20 19:18:00,136 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:18:00,136 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1098888900] [2022-03-20 19:18:00,137 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 19:18:00,137 INFO L85 PathProgramCache]: Analyzing trace with hash -1976466705, now seen corresponding path program 2 times [2022-03-20 19:18:00,137 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:18:00,137 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [639407453] [2022-03-20 19:18:00,137 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:18:00,137 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:18:00,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:18:00,181 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:18:00,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:18:00,193 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2022-03-20 19:18:00,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:18:00,243 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2022-03-20 19:18:00,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:18:00,251 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-03-20 19:18:00,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:18:00,256 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2022-03-20 19:18:00,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:18:00,273 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2022-03-20 19:18:00,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:18:00,285 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-03-20 19:18:00,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:18:00,290 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2022-03-20 19:18:00,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:18:00,292 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 45 [2022-03-20 19:18:00,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:18:00,301 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 51 [2022-03-20 19:18:00,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:18:00,314 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 56 [2022-03-20 19:18:00,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:18:00,319 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2022-03-20 19:18:00,319 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:18:00,319 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [639407453] [2022-03-20 19:18:00,319 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [639407453] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:18:00,320 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:18:00,320 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2022-03-20 19:18:00,320 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:18:00,320 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1098888900] [2022-03-20 19:18:00,320 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1098888900] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:18:00,320 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:18:00,320 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2022-03-20 19:18:00,321 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1991894623] [2022-03-20 19:18:00,323 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:18:00,323 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-03-20 19:18:00,324 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:18:00,324 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-03-20 19:18:00,325 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=130, Unknown=0, NotChecked=0, Total=156 [2022-03-20 19:18:00,325 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) [2022-03-20 19:18:00,832 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:18:00,832 INFO L93 Difference]: Finished difference Result 164 states and 210 transitions. [2022-03-20 19:18:00,832 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-03-20 19:18:00,832 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 [2022-03-20 19:18:00,833 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:18:00,834 INFO L225 Difference]: With dead ends: 164 [2022-03-20 19:18:00,834 INFO L226 Difference]: Without dead ends: 99 [2022-03-20 19:18:00,835 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 [2022-03-20 19:18:00,835 INFO L913 BasicCegarLoop]: 70 mSDtfsCounter, 178 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 796 mSolverCounterSat, 171 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s 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, 0.4s IncrementalHoareTripleChecker+Time [2022-03-20 19:18:00,835 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [180 Valid, 84 Invalid, 967 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [171 Valid, 796 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-03-20 19:18:00,836 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2022-03-20 19:18:00,844 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 95. [2022-03-20 19:18:00,845 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) [2022-03-20 19:18:00,845 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 121 transitions. [2022-03-20 19:18:00,846 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 121 transitions. Word has length 66 [2022-03-20 19:18:00,846 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:18:00,846 INFO L478 AbstractCegarLoop]: Abstraction has 95 states and 121 transitions. [2022-03-20 19:18:00,846 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) [2022-03-20 19:18:00,846 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 121 transitions. [2022-03-20 19:18:00,855 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-03-20 19:18:00,855 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:18:00,855 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] [2022-03-20 19:18:00,855 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-03-20 19:18:00,855 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:18:00,856 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:18:00,856 INFO L85 PathProgramCache]: Analyzing trace with hash -1818938389, now seen corresponding path program 1 times [2022-03-20 19:18:00,856 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:18:00,856 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1391422661] [2022-03-20 19:18:00,856 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 19:18:00,856 INFO L85 PathProgramCache]: Analyzing trace with hash -1818938389, now seen corresponding path program 2 times [2022-03-20 19:18:00,857 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:18:00,857 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1968992493] [2022-03-20 19:18:00,857 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:18:00,857 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:18:00,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:18:00,933 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-20 19:18:00,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:18:00,944 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2022-03-20 19:18:00,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:18:00,969 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2022-03-20 19:18:00,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:18:00,977 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-03-20 19:18:00,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:18:00,981 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2022-03-20 19:18:00,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:18:01,008 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-03-20 19:18:01,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:18:01,011 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2022-03-20 19:18:01,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:18:01,014 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 40 [2022-03-20 19:18:01,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:18:01,018 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2022-03-20 19:18:01,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:18:01,020 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2022-03-20 19:18:01,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:18:01,023 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 58 [2022-03-20 19:18:01,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:18:01,034 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 64 [2022-03-20 19:18:01,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:18:01,049 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 69 [2022-03-20 19:18:01,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-20 19:18:01,068 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2022-03-20 19:18:01,068 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-20 19:18:01,068 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1968992493] [2022-03-20 19:18:01,069 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1968992493] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-20 19:18:01,069 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [623301958] [2022-03-20 19:18:01,069 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-20 19:18:01,069 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-20 19:18:01,069 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-20 19:18:01,070 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) [2022-03-20 19:18:01,091 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-03-20 19:18:01,172 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-20 19:18:01,172 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-20 19:18:01,174 INFO L263 TraceCheckSpWp]: Trace formula consists of 428 conjuncts, 15 conjunts are in the unsatisfiable core [2022-03-20 19:18:01,176 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-20 19:18:01,350 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2022-03-20 19:18:01,350 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-03-20 19:18:01,350 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [623301958] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:18:01,350 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-03-20 19:18:01,350 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [16] total 20 [2022-03-20 19:18:01,350 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-20 19:18:01,351 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1391422661] [2022-03-20 19:18:01,351 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1391422661] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-20 19:18:01,351 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-20 19:18:01,351 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-03-20 19:18:01,351 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1651682349] [2022-03-20 19:18:01,351 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-20 19:18:01,351 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-03-20 19:18:01,351 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-20 19:18:01,352 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-03-20 19:18:01,352 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=340, Unknown=0, NotChecked=0, Total=380 [2022-03-20 19:18:01,352 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) [2022-03-20 19:18:01,437 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-20 19:18:01,438 INFO L93 Difference]: Finished difference Result 150 states and 192 transitions. [2022-03-20 19:18:01,438 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-03-20 19:18:01,438 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 [2022-03-20 19:18:01,439 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-20 19:18:01,451 INFO L225 Difference]: With dead ends: 150 [2022-03-20 19:18:01,451 INFO L226 Difference]: Without dead ends: 97 [2022-03-20 19:18:01,452 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 96 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=52, Invalid=454, Unknown=0, NotChecked=0, Total=506 [2022-03-20 19:18:01,452 INFO L913 BasicCegarLoop]: 104 mSDtfsCounter, 35 mSDsluCounter, 644 mSDsCounter, 0 mSdLazyCounter, 85 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 748 SdHoareTripleChecker+Invalid, 109 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 85 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-20 19:18:01,453 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [39 Valid, 748 Invalid, 109 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 85 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-20 19:18:01,453 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2022-03-20 19:18:01,464 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 97. [2022-03-20 19:18:01,464 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) [2022-03-20 19:18:01,465 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 125 transitions. [2022-03-20 19:18:01,465 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 125 transitions. Word has length 79 [2022-03-20 19:18:01,465 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-20 19:18:01,465 INFO L478 AbstractCegarLoop]: Abstraction has 97 states and 125 transitions. [2022-03-20 19:18:01,466 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) [2022-03-20 19:18:01,466 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 125 transitions. [2022-03-20 19:18:01,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2022-03-20 19:18:01,467 INFO L491 BasicCegarLoop]: Found error trace [2022-03-20 19:18:01,467 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] [2022-03-20 19:18:01,488 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-03-20 19:18:01,677 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 [2022-03-20 19:18:01,678 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-20 19:18:01,678 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-20 19:18:01,678 INFO L85 PathProgramCache]: Analyzing trace with hash -1854783018, now seen corresponding path program 1 times [2022-03-20 19:18:01,678 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-20 19:18:01,678 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1101888798] [2022-03-20 19:18:01,679 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-20 19:18:01,679 INFO L85 PathProgramCache]: Analyzing trace with hash -1854783018, now seen corresponding path program 2 times [2022-03-20 19:18:01,679 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-20 19:18:01,679 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1036769592] [2022-03-20 19:18:01,679 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-20 19:18:01,679 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-20 19:18:01,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 19:18:01,717 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-20 19:18:01,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-20 19:18:01,764 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-20 19:18:01,764 INFO L130 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found a feasible trace [2022-03-20 19:18:01,764 INFO L618 BasicCegarLoop]: Counterexample is feasible [2022-03-20 19:18:01,766 INFO L788 garLoopResultBuilder]: Registering result UNSAFE for location __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2022-03-20 19:18:01,767 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-03-20 19:18:01,771 INFO L719 BasicCegarLoop]: Path program histogram: [2, 2, 2, 2, 2] [2022-03-20 19:18:01,772 INFO L180 ceAbstractionStarter]: Computing trace abstraction results [2022-03-20 19:18:01,794 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.03 07:18:01 BoogieIcfgContainer [2022-03-20 19:18:01,794 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2022-03-20 19:18:01,795 INFO L158 Benchmark]: Toolchain (without parser) took 5143.22ms. Allocated memory was 196.1MB in the beginning and 235.9MB in the end (delta: 39.8MB). Free memory was 145.2MB in the beginning and 165.1MB in the end (delta: -20.0MB). Peak memory consumption was 20.2MB. Max. memory is 8.0GB. [2022-03-20 19:18:01,795 INFO L158 Benchmark]: CDTParser took 0.26ms. Allocated memory is still 196.1MB. Free memory is still 161.8MB. There was no memory consumed. Max. memory is 8.0GB. [2022-03-20 19:18:01,795 INFO L158 Benchmark]: CACSL2BoogieTranslator took 210.49ms. Allocated memory was 196.1MB in the beginning and 235.9MB in the end (delta: 39.8MB). Free memory was 145.0MB in the beginning and 210.1MB in the end (delta: -65.0MB). Peak memory consumption was 10.2MB. Max. memory is 8.0GB. [2022-03-20 19:18:01,795 INFO L158 Benchmark]: Boogie Preprocessor took 32.91ms. Allocated memory is still 235.9MB. Free memory was 210.1MB in the beginning and 208.0MB in the end (delta: 2.1MB). Peak memory consumption was 2.1MB. Max. memory is 8.0GB. [2022-03-20 19:18:01,796 INFO L158 Benchmark]: RCFGBuilder took 397.48ms. Allocated memory is still 235.9MB. Free memory was 208.0MB in the beginning and 188.1MB in the end (delta: 19.9MB). Peak memory consumption was 19.9MB. Max. memory is 8.0GB. [2022-03-20 19:18:01,796 INFO L158 Benchmark]: TraceAbstraction took 4499.11ms. Allocated memory is still 235.9MB. Free memory was 187.6MB in the beginning and 165.1MB in the end (delta: 22.4MB). Peak memory consumption was 23.4MB. Max. memory is 8.0GB. [2022-03-20 19:18:01,797 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.26ms. Allocated memory is still 196.1MB. Free memory is still 161.8MB. There was no memory consumed. Max. memory is 8.0GB. * CACSL2BoogieTranslator took 210.49ms. Allocated memory was 196.1MB in the beginning and 235.9MB in the end (delta: 39.8MB). Free memory was 145.0MB in the beginning and 210.1MB in the end (delta: -65.0MB). Peak memory consumption was 10.2MB. Max. memory is 8.0GB. * Boogie Preprocessor took 32.91ms. Allocated memory is still 235.9MB. Free memory was 210.1MB in the beginning and 208.0MB in the end (delta: 2.1MB). Peak memory consumption was 2.1MB. Max. memory is 8.0GB. * RCFGBuilder took 397.48ms. Allocated memory is still 235.9MB. Free memory was 208.0MB in the beginning and 188.1MB in the end (delta: 19.9MB). Peak memory consumption was 19.9MB. Max. memory is 8.0GB. * TraceAbstraction took 4499.11ms. Allocated memory is still 235.9MB. Free memory was 187.6MB in the beginning and 165.1MB in the end (delta: 22.4MB). Peak memory consumption was 23.4MB. 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: 4.4s, OverallIterations: 5, TraceHistogramMax: 3, PathProgramHistogramMax: 2, EmptinessCheckTime: 0.0s, AutomataDifference: 1.9s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, PartialOrderReductionTime: 0.0s, HoareTripleCheckerStatistics: 0 mSolverCounterUnknown, 588 SdHoareTripleChecker+Valid, 1.2s IncrementalHoareTripleChecker+Time, 0 mSdLazyCounter, 546 mSDsluCounter, 1013 SdHoareTripleChecker+Invalid, 1.0s Time, 0 mProtectedAction, 0 SdHoareTripleChecker+Unchecked, 0 IncrementalHoareTripleChecker+Unchecked, 688 mSDsCounter, 499 IncrementalHoareTripleChecker+Valid, 0 mProtectedPredicate, 2373 IncrementalHoareTripleChecker+Invalid, 2872 SdHoareTripleChecker+Unknown, 0 mSolverCounterNotChecked, 499 mSolverCounterUnsat, 325 mSDtfsCounter, 2373 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, 0.7s 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! [2022-03-20 19:18:01,820 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...