/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/loops/invert_string-3.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-34549b5 [2022-04-06 14:19:10,888 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-04-06 14:19:10,890 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-04-06 14:19:10,915 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-04-06 14:19:10,915 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-04-06 14:19:10,916 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-04-06 14:19:10,917 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-04-06 14:19:10,919 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-04-06 14:19:10,920 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-04-06 14:19:10,920 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-04-06 14:19:10,921 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-04-06 14:19:10,922 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-04-06 14:19:10,923 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-04-06 14:19:10,924 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-04-06 14:19:10,924 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-04-06 14:19:10,925 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-04-06 14:19:10,926 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-04-06 14:19:10,927 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-04-06 14:19:10,929 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-04-06 14:19:10,930 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-04-06 14:19:10,931 INFO L181 SettingsManager]: Resetting HornVerifier preferences to default values [2022-04-06 14:19:10,931 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-04-06 14:19:10,932 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-04-06 14:19:10,933 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-04-06 14:19:10,933 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-04-06 14:19:10,935 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-04-06 14:19:10,935 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-04-06 14:19:10,936 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-04-06 14:19:10,936 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-04-06 14:19:10,936 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-04-06 14:19:10,937 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-04-06 14:19:10,937 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-04-06 14:19:10,938 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-04-06 14:19:10,938 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-04-06 14:19:10,939 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-04-06 14:19:10,939 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-04-06 14:19:10,940 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-04-06 14:19:10,940 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-04-06 14:19:10,940 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-04-06 14:19:10,941 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-04-06 14:19:10,941 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-04-06 14:19:10,942 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-04-06 14:19:10,943 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 14:19:10,948 INFO L113 SettingsManager]: Loading preferences was successful [2022-04-06 14:19:10,949 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-04-06 14:19:10,949 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-04-06 14:19:10,950 INFO L138 SettingsManager]: * sizeof long=4 [2022-04-06 14:19:10,950 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-04-06 14:19:10,950 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-04-06 14:19:10,950 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-04-06 14:19:10,950 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-04-06 14:19:10,950 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-04-06 14:19:10,950 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-04-06 14:19:10,950 INFO L138 SettingsManager]: * sizeof long double=12 [2022-04-06 14:19:10,951 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-04-06 14:19:10,951 INFO L138 SettingsManager]: * Use constant arrays=true [2022-04-06 14:19:10,951 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-04-06 14:19:10,951 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-04-06 14:19:10,951 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-04-06 14:19:10,951 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-04-06 14:19:10,951 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-04-06 14:19:10,951 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-04-06 14:19:10,951 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-04-06 14:19:10,951 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=Craig_NestedInterpolation [2022-04-06 14:19:10,951 INFO L138 SettingsManager]: * Trace refinement strategy=ACCELERATED_INTERPOLATION [2022-04-06 14:19:10,952 INFO L138 SettingsManager]: * Trace refinement strategy used in Accelerated Interpolation=CAMEL [2022-04-06 14:19:10,952 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-04-06 14:19:10,952 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2022-04-06 14:19:10,952 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-04-06 14:19:11,109 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-04-06 14:19:11,122 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-04-06 14:19:11,124 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-04-06 14:19:11,125 INFO L271 PluginConnector]: Initializing CDTParser... [2022-04-06 14:19:11,128 INFO L275 PluginConnector]: CDTParser initialized [2022-04-06 14:19:11,129 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/invert_string-3.c [2022-04-06 14:19:11,172 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/45d2d84c9/959d86e546fc42518ce677984b3c7223/FLAG524ab75d1 [2022-04-06 14:19:11,462 INFO L306 CDTParser]: Found 1 translation units. [2022-04-06 14:19:11,463 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/invert_string-3.c [2022-04-06 14:19:11,466 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/45d2d84c9/959d86e546fc42518ce677984b3c7223/FLAG524ab75d1 [2022-04-06 14:19:11,905 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/45d2d84c9/959d86e546fc42518ce677984b3c7223 [2022-04-06 14:19:11,906 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-04-06 14:19:11,907 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-04-06 14:19:11,910 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-04-06 14:19:11,911 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-04-06 14:19:11,913 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-04-06 14:19:11,913 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.04 02:19:11" (1/1) ... [2022-04-06 14:19:11,914 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@34ef5522 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 02:19:11, skipping insertion in model container [2022-04-06 14:19:11,914 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.04 02:19:11" (1/1) ... [2022-04-06 14:19:11,919 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-04-06 14:19:11,930 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-04-06 14:19:12,074 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops/invert_string-3.c[327,340] [2022-04-06 14:19:12,095 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-04-06 14:19:12,100 INFO L203 MainTranslator]: Completed pre-run [2022-04-06 14:19:12,109 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops/invert_string-3.c[327,340] [2022-04-06 14:19:12,124 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-04-06 14:19:12,134 INFO L208 MainTranslator]: Completed translation [2022-04-06 14:19:12,134 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 02:19:12 WrapperNode [2022-04-06 14:19:12,134 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-04-06 14:19:12,135 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-04-06 14:19:12,135 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-04-06 14:19:12,135 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-04-06 14:19:12,143 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 02:19:12" (1/1) ... [2022-04-06 14:19:12,143 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 02:19:12" (1/1) ... [2022-04-06 14:19:12,153 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 02:19:12" (1/1) ... [2022-04-06 14:19:12,154 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 02:19:12" (1/1) ... [2022-04-06 14:19:12,165 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 02:19:12" (1/1) ... [2022-04-06 14:19:12,169 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 02:19:12" (1/1) ... [2022-04-06 14:19:12,174 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 02:19:12" (1/1) ... [2022-04-06 14:19:12,177 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-04-06 14:19:12,178 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-04-06 14:19:12,178 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-04-06 14:19:12,178 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-04-06 14:19:12,180 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 02:19:12" (1/1) ... [2022-04-06 14:19:12,185 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-04-06 14:19:12,194 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 14:19:12,236 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 14:19:12,240 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 14:19:12,263 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-04-06 14:19:12,263 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-04-06 14:19:12,264 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-04-06 14:19:12,264 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-04-06 14:19:12,264 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-04-06 14:19:12,265 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-04-06 14:19:12,265 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-04-06 14:19:12,265 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-04-06 14:19:12,265 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-04-06 14:19:12,266 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-04-06 14:19:12,266 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2022-04-06 14:19:12,266 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-04-06 14:19:12,267 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-04-06 14:19:12,267 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-04-06 14:19:12,267 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-04-06 14:19:12,267 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-04-06 14:19:12,268 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-04-06 14:19:12,268 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-04-06 14:19:12,268 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-04-06 14:19:12,314 INFO L234 CfgBuilder]: Building ICFG [2022-04-06 14:19:12,315 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-04-06 14:19:12,402 INFO L275 CfgBuilder]: Performing block encoding [2022-04-06 14:19:12,406 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-04-06 14:19:12,406 INFO L299 CfgBuilder]: Removed 3 assume(true) statements. [2022-04-06 14:19:12,407 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.04 02:19:12 BoogieIcfgContainer [2022-04-06 14:19:12,407 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-04-06 14:19:12,408 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-04-06 14:19:12,408 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-04-06 14:19:12,411 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-04-06 14:19:12,411 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.04 02:19:11" (1/3) ... [2022-04-06 14:19:12,411 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2d770153 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.04 02:19:12, skipping insertion in model container [2022-04-06 14:19:12,411 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.04 02:19:12" (2/3) ... [2022-04-06 14:19:12,412 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2d770153 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.04 02:19:12, skipping insertion in model container [2022-04-06 14:19:12,412 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.04 02:19:12" (3/3) ... [2022-04-06 14:19:12,412 INFO L111 eAbstractionObserver]: Analyzing ICFG invert_string-3.c [2022-04-06 14:19:12,415 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-04-06 14:19:12,415 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-04-06 14:19:12,440 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-04-06 14:19:12,446 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 14:19:12,447 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-04-06 14:19:12,458 INFO L276 IsEmpty]: Start isEmpty. Operand has 27 states, 19 states have (on average 1.4210526315789473) internal successors, (27), 20 states have internal predecessors, (27), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-04-06 14:19:12,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-04-06 14:19:12,467 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 14:19:12,467 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 14:19:12,468 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 14:19:12,471 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 14:19:12,471 INFO L85 PathProgramCache]: Analyzing trace with hash 1728321422, now seen corresponding path program 1 times [2022-04-06 14:19:12,478 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 14:19:12,478 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1089925954] [2022-04-06 14:19:12,486 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-04-06 14:19:12,486 INFO L85 PathProgramCache]: Analyzing trace with hash 1728321422, now seen corresponding path program 2 times [2022-04-06 14:19:12,488 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 14:19:12,488 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2119882206] [2022-04-06 14:19:12,488 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 14:19:12,489 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 14:19:12,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 14:19:12,775 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 14:19:12,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 14:19:12,784 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 14:19:12,784 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 14:19:12,784 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2119882206] [2022-04-06 14:19:12,785 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2119882206] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 14:19:12,785 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 14:19:12,785 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-04-06 14:19:12,787 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 14:19:12,787 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1089925954] [2022-04-06 14:19:12,787 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1089925954] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 14:19:12,787 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 14:19:12,787 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-04-06 14:19:12,787 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [553851815] [2022-04-06 14:19:12,788 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 14:19:12,790 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-04-06 14:19:12,791 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 14:19:12,806 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-04-06 14:19:12,806 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-04-06 14:19:12,808 INFO L87 Difference]: Start difference. First operand has 27 states, 19 states have (on average 1.4210526315789473) internal successors, (27), 20 states have internal predecessors, (27), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 14:19:12,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 14:19:12,910 INFO L93 Difference]: Finished difference Result 48 states and 61 transitions. [2022-04-06 14:19:12,911 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-04-06 14:19:12,912 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2022-04-06 14:19:12,912 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 14:19:12,916 INFO L225 Difference]: With dead ends: 48 [2022-04-06 14:19:12,917 INFO L226 Difference]: Without dead ends: 24 [2022-04-06 14:19:12,921 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2022-04-06 14:19:12,926 INFO L913 BasicCegarLoop]: 20 mSDtfsCounter, 36 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-06 14:19:12,927 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [36 Valid, 35 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-06 14:19:12,937 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2022-04-06 14:19:12,952 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2022-04-06 14:19:12,953 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 17 states have (on average 1.1764705882352942) internal successors, (20), 17 states have internal predecessors, (20), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-04-06 14:19:12,954 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2022-04-06 14:19:12,957 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 15 [2022-04-06 14:19:12,957 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 14:19:12,957 INFO L478 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2022-04-06 14:19:12,957 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 14:19:12,958 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2022-04-06 14:19:12,959 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-04-06 14:19:12,959 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 14:19:12,959 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 14:19:12,959 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-04-06 14:19:12,959 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 14:19:12,962 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 14:19:12,962 INFO L85 PathProgramCache]: Analyzing trace with hash -1238871028, now seen corresponding path program 1 times [2022-04-06 14:19:12,963 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 14:19:12,963 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [169851909] [2022-04-06 14:19:12,974 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 3 HavocedVariables, 3 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 14:19:12,974 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-04-06 14:19:12,975 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 14:19:12,975 INFO L85 PathProgramCache]: Analyzing trace with hash -1238871028, now seen corresponding path program 2 times [2022-04-06 14:19:12,975 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 14:19:12,975 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1810222607] [2022-04-06 14:19:12,975 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 14:19:12,975 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 14:19:13,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 14:19:13,077 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 14:19:13,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 14:19:13,082 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-04-06 14:19:13,082 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 14:19:13,083 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1810222607] [2022-04-06 14:19:13,083 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1810222607] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 14:19:13,083 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 14:19:13,083 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-04-06 14:19:13,083 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 14:19:13,083 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [169851909] [2022-04-06 14:19:13,084 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [169851909] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 14:19:13,084 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 14:19:13,084 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-04-06 14:19:13,084 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1418177197] [2022-04-06 14:19:13,084 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 14:19:13,085 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-04-06 14:19:13,085 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 14:19:13,085 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-04-06 14:19:13,085 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-04-06 14:19:13,085 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand has 4 states, 4 states have (on average 3.25) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 14:19:13,125 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 14:19:13,125 INFO L93 Difference]: Finished difference Result 40 states and 44 transitions. [2022-04-06 14:19:13,125 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-04-06 14:19:13,126 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.25) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2022-04-06 14:19:13,126 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 14:19:13,126 INFO L225 Difference]: With dead ends: 40 [2022-04-06 14:19:13,126 INFO L226 Difference]: Without dead ends: 25 [2022-04-06 14:19:13,127 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-04-06 14:19:13,128 INFO L913 BasicCegarLoop]: 21 mSDtfsCounter, 19 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-06 14:19:13,128 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 28 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-06 14:19:13,129 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2022-04-06 14:19:13,134 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 24. [2022-04-06 14:19:13,134 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 18 states have internal predecessors, (21), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-04-06 14:19:13,134 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2022-04-06 14:19:13,134 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 17 [2022-04-06 14:19:13,134 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 14:19:13,135 INFO L478 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2022-04-06 14:19:13,135 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.25) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 14:19:13,135 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2022-04-06 14:19:13,135 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-04-06 14:19:13,135 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 14:19:13,135 INFO L499 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 14:19:13,136 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-04-06 14:19:13,136 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 14:19:13,136 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 14:19:13,136 INFO L85 PathProgramCache]: Analyzing trace with hash -1304082102, now seen corresponding path program 1 times [2022-04-06 14:19:13,136 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 14:19:13,136 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [598924694] [2022-04-06 14:19:13,138 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 14:19:13,138 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-04-06 14:19:13,138 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 14:19:13,138 INFO L85 PathProgramCache]: Analyzing trace with hash -1304082102, now seen corresponding path program 2 times [2022-04-06 14:19:13,138 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 14:19:13,138 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [603805357] [2022-04-06 14:19:13,139 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 14:19:13,139 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 14:19:13,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 14:19:13,259 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 14:19:13,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 14:19:13,271 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-04-06 14:19:13,271 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 14:19:13,271 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [603805357] [2022-04-06 14:19:13,271 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [603805357] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 14:19:13,271 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1926418642] [2022-04-06 14:19:13,271 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 14:19:13,272 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 14:19:13,272 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 14:19:13,292 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 14:19:13,311 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 14:19:13,351 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 14:19:13,351 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 14:19:13,363 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 33 conjunts are in the unsatisfiable core [2022-04-06 14:19:13,368 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 14:19:13,427 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-04-06 14:19:13,577 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 17 [2022-04-06 14:19:13,802 INFO L173 IndexEqualityManager]: detected equality via solver [2022-04-06 14:19:13,803 INFO L173 IndexEqualityManager]: detected equality via solver [2022-04-06 14:19:13,805 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 10 [2022-04-06 14:19:13,845 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-04-06 14:19:13,846 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 14:19:14,056 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-04-06 14:19:14,057 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 82 treesize of output 78 [2022-04-06 14:19:14,080 INFO L356 Elim1Store]: treesize reduction 26, result has 39.5 percent of original size [2022-04-06 14:19:14,081 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 116 treesize of output 102 [2022-04-06 14:19:14,111 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-04-06 14:19:14,112 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 17 [2022-04-06 14:19:14,118 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 30 [2022-04-06 14:19:14,142 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-04-06 14:19:14,142 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 80 treesize of output 76 [2022-04-06 14:19:14,154 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-04-06 14:19:14,155 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 16 [2022-04-06 14:19:14,159 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 28 [2022-04-06 14:19:14,172 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-04-06 14:19:14,177 INFO L356 Elim1Store]: treesize reduction 5, result has 68.8 percent of original size [2022-04-06 14:19:14,179 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 110 treesize of output 89 [2022-04-06 14:19:14,380 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-04-06 14:19:14,383 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1926418642] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 14:19:14,383 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 14:19:14,383 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 11, 10] total 20 [2022-04-06 14:19:14,383 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 14:19:14,386 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [598924694] [2022-04-06 14:19:14,386 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [598924694] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 14:19:14,386 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 14:19:14,386 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-04-06 14:19:14,386 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [593072435] [2022-04-06 14:19:14,386 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 14:19:14,386 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-04-06 14:19:14,387 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 14:19:14,387 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-04-06 14:19:14,388 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=321, Unknown=0, NotChecked=0, Total=380 [2022-04-06 14:19:14,388 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand has 6 states, 6 states have (on average 2.5) internal successors, (15), 5 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 14:19:14,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 14:19:14,464 INFO L93 Difference]: Finished difference Result 42 states and 46 transitions. [2022-04-06 14:19:14,464 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-04-06 14:19:14,464 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 5 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 19 [2022-04-06 14:19:14,464 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 14:19:14,465 INFO L225 Difference]: With dead ends: 42 [2022-04-06 14:19:14,466 INFO L226 Difference]: Without dead ends: 27 [2022-04-06 14:19:14,466 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 95 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=71, Invalid=391, Unknown=0, NotChecked=0, Total=462 [2022-04-06 14:19:14,468 INFO L913 BasicCegarLoop]: 21 mSDtfsCounter, 21 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-06 14:19:14,469 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 33 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-06 14:19:14,470 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2022-04-06 14:19:14,476 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2022-04-06 14:19:14,476 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 20 states have (on average 1.15) internal successors, (23), 20 states have internal predecessors, (23), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-04-06 14:19:14,477 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2022-04-06 14:19:14,477 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 19 [2022-04-06 14:19:14,477 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 14:19:14,477 INFO L478 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2022-04-06 14:19:14,478 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 5 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 14:19:14,478 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2022-04-06 14:19:14,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-04-06 14:19:14,479 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 14:19:14,479 INFO L499 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 14:19:14,510 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 14:19:14,695 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 14:19:14,695 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 14:19:14,696 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 14:19:14,696 INFO L85 PathProgramCache]: Analyzing trace with hash 452585224, now seen corresponding path program 3 times [2022-04-06 14:19:14,696 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 14:19:14,696 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [667281331] [2022-04-06 14:19:14,697 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 14:19:14,697 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-04-06 14:19:14,697 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 14:19:14,698 INFO L85 PathProgramCache]: Analyzing trace with hash 452585224, now seen corresponding path program 4 times [2022-04-06 14:19:14,698 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 14:19:14,698 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [949689266] [2022-04-06 14:19:14,698 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 14:19:14,698 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 14:19:14,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 14:19:14,779 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 14:19:14,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 14:19:14,783 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-04-06 14:19:14,783 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 14:19:14,784 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [949689266] [2022-04-06 14:19:14,784 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [949689266] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 14:19:14,784 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1222794974] [2022-04-06 14:19:14,784 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-04-06 14:19:14,784 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 14:19:14,784 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 14:19:14,812 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 14:19:14,813 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 14:19:14,852 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-04-06 14:19:14,852 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 14:19:14,853 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 30 conjunts are in the unsatisfiable core [2022-04-06 14:19:14,855 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 14:19:14,876 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-04-06 14:19:14,970 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 17 [2022-04-06 14:19:15,166 INFO L173 IndexEqualityManager]: detected equality via solver [2022-04-06 14:19:15,167 INFO L173 IndexEqualityManager]: detected equality via solver [2022-04-06 14:19:15,167 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 10 [2022-04-06 14:19:15,198 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-04-06 14:19:15,199 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 14:19:15,349 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-04-06 14:19:15,349 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 82 treesize of output 78 [2022-04-06 14:19:15,369 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-04-06 14:19:15,374 INFO L356 Elim1Store]: treesize reduction 5, result has 70.6 percent of original size [2022-04-06 14:19:15,374 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 51 treesize of output 42 [2022-04-06 14:19:15,380 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-04-06 14:19:15,381 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 17 [2022-04-06 14:19:15,385 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 30 [2022-04-06 14:19:15,399 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-04-06 14:19:15,400 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 49 treesize of output 17 [2022-04-06 14:19:15,404 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 30 [2022-04-06 14:19:15,412 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-04-06 14:19:15,416 INFO L356 Elim1Store]: treesize reduction 5, result has 70.6 percent of original size [2022-04-06 14:19:15,417 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 93 treesize of output 42 [2022-04-06 14:19:15,430 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-04-06 14:19:15,431 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 17 [2022-04-06 14:19:15,434 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-04-06 14:19:15,449 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-04-06 14:19:15,468 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-04-06 14:19:15,468 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 80 treesize of output 76 [2022-04-06 14:19:15,484 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-04-06 14:19:15,484 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 16 [2022-04-06 14:19:15,489 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 28 [2022-04-06 14:19:15,499 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-04-06 14:19:15,504 INFO L356 Elim1Store]: treesize reduction 5, result has 68.8 percent of original size [2022-04-06 14:19:15,504 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 87 treesize of output 39 [2022-04-06 14:19:15,523 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-04-06 14:19:15,524 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 16 [2022-04-06 14:19:15,526 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-04-06 14:19:15,535 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-04-06 14:19:15,539 INFO L356 Elim1Store]: treesize reduction 15, result has 6.3 percent of original size [2022-04-06 14:19:15,539 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 48 treesize of output 1 [2022-04-06 14:19:15,547 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-04-06 14:19:15,547 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 16 [2022-04-06 14:19:15,550 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-04-06 14:19:15,561 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-04-06 14:19:15,711 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-04-06 14:19:15,711 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1222794974] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 14:19:15,711 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 14:19:15,712 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 11, 10] total 21 [2022-04-06 14:19:15,712 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 14:19:15,712 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [667281331] [2022-04-06 14:19:15,712 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [667281331] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 14:19:15,712 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 14:19:15,712 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-04-06 14:19:15,712 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [871415212] [2022-04-06 14:19:15,712 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 14:19:15,713 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-04-06 14:19:15,713 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 14:19:15,714 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-04-06 14:19:15,714 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=354, Unknown=0, NotChecked=0, Total=420 [2022-04-06 14:19:15,714 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 6 states have internal predecessors, (17), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 14:19:15,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 14:19:15,783 INFO L93 Difference]: Finished difference Result 44 states and 48 transitions. [2022-04-06 14:19:15,783 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-04-06 14:19:15,784 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 6 states have internal predecessors, (17), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 21 [2022-04-06 14:19:15,784 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 14:19:15,784 INFO L225 Difference]: With dead ends: 44 [2022-04-06 14:19:15,785 INFO L226 Difference]: Without dead ends: 29 [2022-04-06 14:19:15,786 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 29 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 112 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=87, Invalid=465, Unknown=0, NotChecked=0, Total=552 [2022-04-06 14:19:15,787 INFO L913 BasicCegarLoop]: 21 mSDtfsCounter, 24 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-06 14:19:15,787 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 28 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-06 14:19:15,788 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2022-04-06 14:19:15,793 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 28. [2022-04-06 14:19:15,793 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 22 states have (on average 1.1363636363636365) internal successors, (25), 22 states have internal predecessors, (25), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-04-06 14:19:15,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2022-04-06 14:19:15,798 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 21 [2022-04-06 14:19:15,798 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 14:19:15,798 INFO L478 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2022-04-06 14:19:15,798 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 6 states have internal predecessors, (17), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 14:19:15,798 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2022-04-06 14:19:15,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-04-06 14:19:15,798 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 14:19:15,799 INFO L499 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 14:19:15,816 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2022-04-06 14:19:16,016 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 14:19:16,017 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 14:19:16,017 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 14:19:16,017 INFO L85 PathProgramCache]: Analyzing trace with hash 687738182, now seen corresponding path program 5 times [2022-04-06 14:19:16,017 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 14:19:16,018 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1166767446] [2022-04-06 14:19:16,019 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 14:19:16,019 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-04-06 14:19:16,019 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 14:19:16,019 INFO L85 PathProgramCache]: Analyzing trace with hash 687738182, now seen corresponding path program 6 times [2022-04-06 14:19:16,019 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 14:19:16,019 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1661370495] [2022-04-06 14:19:16,019 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 14:19:16,019 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 14:19:16,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 14:19:16,151 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 14:19:16,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 14:19:16,160 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-04-06 14:19:16,160 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 14:19:16,160 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1661370495] [2022-04-06 14:19:16,160 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1661370495] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 14:19:16,160 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [873319018] [2022-04-06 14:19:16,160 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-04-06 14:19:16,160 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 14:19:16,161 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 14:19:16,176 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 14:19:16,177 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-04-06 14:19:16,254 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2022-04-06 14:19:16,254 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 14:19:16,255 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 37 conjunts are in the unsatisfiable core [2022-04-06 14:19:16,257 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 14:19:16,271 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-04-06 14:19:16,381 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 54 treesize of output 49 [2022-04-06 14:19:16,387 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 14 [2022-04-06 14:19:16,406 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 13 [2022-04-06 14:19:16,499 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-04-06 14:19:16,503 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-04-06 14:19:16,504 INFO L173 IndexEqualityManager]: detected equality via solver [2022-04-06 14:19:16,505 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 63 treesize of output 59 [2022-04-06 14:19:16,799 INFO L173 IndexEqualityManager]: detected equality via solver [2022-04-06 14:19:16,800 INFO L173 IndexEqualityManager]: detected equality via solver [2022-04-06 14:19:16,800 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 13 [2022-04-06 14:19:16,855 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-04-06 14:19:16,856 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 14:19:17,156 INFO L356 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-04-06 14:19:17,156 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 330 treesize of output 1 [2022-04-06 14:19:17,170 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-04-06 14:19:17,170 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [873319018] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 14:19:17,170 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 14:19:17,170 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11, 10] total 23 [2022-04-06 14:19:17,170 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 14:19:17,170 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1166767446] [2022-04-06 14:19:17,170 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1166767446] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 14:19:17,170 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 14:19:17,171 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-04-06 14:19:17,171 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1963928788] [2022-04-06 14:19:17,171 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 14:19:17,171 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-04-06 14:19:17,171 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 14:19:17,171 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-04-06 14:19:17,172 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=428, Unknown=0, NotChecked=0, Total=506 [2022-04-06 14:19:17,172 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 14:19:17,263 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 14:19:17,264 INFO L93 Difference]: Finished difference Result 46 states and 50 transitions. [2022-04-06 14:19:17,264 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-04-06 14:19:17,264 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 23 [2022-04-06 14:19:17,264 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 14:19:17,265 INFO L225 Difference]: With dead ends: 46 [2022-04-06 14:19:17,265 INFO L226 Difference]: Without dead ends: 31 [2022-04-06 14:19:17,265 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 32 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 122 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=108, Invalid=594, Unknown=0, NotChecked=0, Total=702 [2022-04-06 14:19:17,266 INFO L913 BasicCegarLoop]: 21 mSDtfsCounter, 26 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-06 14:19:17,266 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 28 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-06 14:19:17,266 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2022-04-06 14:19:17,273 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 30. [2022-04-06 14:19:17,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 24 states have (on average 1.125) internal successors, (27), 24 states have internal predecessors, (27), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-04-06 14:19:17,274 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2022-04-06 14:19:17,274 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 23 [2022-04-06 14:19:17,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 14:19:17,274 INFO L478 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2022-04-06 14:19:17,274 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 14:19:17,274 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2022-04-06 14:19:17,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-04-06 14:19:17,275 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 14:19:17,275 INFO L499 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 14:19:17,309 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-04-06 14:19:17,491 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 14:19:17,491 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 14:19:17,492 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 14:19:17,492 INFO L85 PathProgramCache]: Analyzing trace with hash -963535868, now seen corresponding path program 7 times [2022-04-06 14:19:17,492 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 14:19:17,492 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1875002659] [2022-04-06 14:19:17,493 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 14:19:17,493 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-04-06 14:19:17,494 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 14:19:17,494 INFO L85 PathProgramCache]: Analyzing trace with hash -963535868, now seen corresponding path program 8 times [2022-04-06 14:19:17,494 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 14:19:17,494 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2105861771] [2022-04-06 14:19:17,494 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 14:19:17,494 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 14:19:17,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 14:19:17,591 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 14:19:17,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 14:19:17,595 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-04-06 14:19:17,596 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 14:19:17,596 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2105861771] [2022-04-06 14:19:17,596 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2105861771] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 14:19:17,596 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1263196742] [2022-04-06 14:19:17,596 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 14:19:17,596 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 14:19:17,596 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 14:19:17,612 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 14:19:17,644 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-04-06 14:19:17,659 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 14:19:17,659 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 14:19:17,660 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 33 conjunts are in the unsatisfiable core [2022-04-06 14:19:17,664 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 14:19:17,676 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-04-06 14:19:17,773 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 17 [2022-04-06 14:19:17,924 INFO L173 IndexEqualityManager]: detected equality via solver [2022-04-06 14:19:17,924 INFO L173 IndexEqualityManager]: detected equality via solver [2022-04-06 14:19:17,925 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 10 [2022-04-06 14:19:17,958 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-04-06 14:19:17,959 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 14:19:18,117 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-04-06 14:19:18,118 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 82 treesize of output 78 [2022-04-06 14:19:18,127 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-04-06 14:19:18,127 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 17 [2022-04-06 14:19:18,132 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 30 [2022-04-06 14:19:18,143 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-04-06 14:19:18,143 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 17 [2022-04-06 14:19:18,145 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-04-06 14:19:18,152 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-04-06 14:19:18,157 INFO L356 Elim1Store]: treesize reduction 5, result has 70.6 percent of original size [2022-04-06 14:19:18,157 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 51 treesize of output 42 [2022-04-06 14:19:18,176 INFO L356 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2022-04-06 14:19:18,176 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 43 treesize of output 30 [2022-04-06 14:19:18,186 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-04-06 14:19:18,189 INFO L356 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2022-04-06 14:19:18,189 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 93 treesize of output 1 [2022-04-06 14:19:18,195 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-04-06 14:19:18,196 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 49 treesize of output 17 [2022-04-06 14:19:18,220 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-04-06 14:19:18,246 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-04-06 14:19:18,246 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 80 treesize of output 76 [2022-04-06 14:19:18,257 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-04-06 14:19:18,261 INFO L356 Elim1Store]: treesize reduction 5, result has 68.8 percent of original size [2022-04-06 14:19:18,262 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 48 treesize of output 39 [2022-04-06 14:19:18,272 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-04-06 14:19:18,273 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 16 [2022-04-06 14:19:18,276 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 28 [2022-04-06 14:19:18,292 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-04-06 14:19:18,293 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 16 [2022-04-06 14:19:18,297 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 28 [2022-04-06 14:19:18,304 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-04-06 14:19:18,305 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 59 treesize of output 45 [2022-04-06 14:19:18,307 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-04-06 14:19:18,315 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-04-06 14:19:18,319 INFO L356 Elim1Store]: treesize reduction 5, result has 68.8 percent of original size [2022-04-06 14:19:18,319 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 100 treesize of output 79 [2022-04-06 14:19:18,451 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-04-06 14:19:18,451 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1263196742] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 14:19:18,451 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 14:19:18,452 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11, 10] total 23 [2022-04-06 14:19:18,452 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 14:19:18,452 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1875002659] [2022-04-06 14:19:18,452 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1875002659] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 14:19:18,452 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 14:19:18,452 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-04-06 14:19:18,452 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [929405969] [2022-04-06 14:19:18,452 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 14:19:18,453 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-04-06 14:19:18,453 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 14:19:18,453 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-04-06 14:19:18,453 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=435, Unknown=0, NotChecked=0, Total=506 [2022-04-06 14:19:18,453 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 14:19:18,729 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 14:19:18,729 INFO L93 Difference]: Finished difference Result 48 states and 52 transitions. [2022-04-06 14:19:18,729 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-04-06 14:19:18,729 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 25 [2022-04-06 14:19:18,730 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 14:19:18,730 INFO L225 Difference]: With dead ends: 48 [2022-04-06 14:19:18,730 INFO L226 Difference]: Without dead ends: 33 [2022-04-06 14:19:18,730 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 37 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 167 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=113, Invalid=643, Unknown=0, NotChecked=0, Total=756 [2022-04-06 14:19:18,731 INFO L913 BasicCegarLoop]: 21 mSDtfsCounter, 28 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 80 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 92 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 80 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-06 14:19:18,731 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 43 Invalid, 92 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 80 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-06 14:19:18,731 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2022-04-06 14:19:18,735 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 32. [2022-04-06 14:19:18,736 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 26 states have (on average 1.1153846153846154) internal successors, (29), 26 states have internal predecessors, (29), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-04-06 14:19:18,736 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2022-04-06 14:19:18,736 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 25 [2022-04-06 14:19:18,736 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 14:19:18,736 INFO L478 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2022-04-06 14:19:18,737 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 14:19:18,737 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2022-04-06 14:19:18,737 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-04-06 14:19:18,737 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 14:19:18,737 INFO L499 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 14:19:18,771 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-04-06 14:19:18,951 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 14:19:18,951 INFO L403 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 14:19:18,952 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 14:19:18,952 INFO L85 PathProgramCache]: Analyzing trace with hash 1300001602, now seen corresponding path program 9 times [2022-04-06 14:19:18,952 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 14:19:18,952 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [90089873] [2022-04-06 14:19:18,953 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 14:19:18,953 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-04-06 14:19:18,953 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 14:19:18,953 INFO L85 PathProgramCache]: Analyzing trace with hash 1300001602, now seen corresponding path program 10 times [2022-04-06 14:19:18,953 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 14:19:18,953 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1423391480] [2022-04-06 14:19:18,954 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 14:19:18,954 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 14:19:18,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 14:19:19,059 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 14:19:19,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 14:19:19,065 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-04-06 14:19:19,065 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 14:19:19,065 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1423391480] [2022-04-06 14:19:19,065 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1423391480] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 14:19:19,066 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [778507227] [2022-04-06 14:19:19,066 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-04-06 14:19:19,066 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 14:19:19,066 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 14:19:19,067 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 14:19:19,094 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-04-06 14:19:19,136 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-04-06 14:19:19,137 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 14:19:19,138 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 30 conjunts are in the unsatisfiable core [2022-04-06 14:19:19,140 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 14:19:19,150 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-04-06 14:19:19,266 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 17 [2022-04-06 14:19:19,406 INFO L173 IndexEqualityManager]: detected equality via solver [2022-04-06 14:19:19,406 INFO L173 IndexEqualityManager]: detected equality via solver [2022-04-06 14:19:19,407 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 10 [2022-04-06 14:19:19,435 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-04-06 14:19:19,435 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 14:19:19,598 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-04-06 14:19:19,598 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 82 treesize of output 78 [2022-04-06 14:19:19,606 INFO L356 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2022-04-06 14:19:19,606 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 43 treesize of output 30 [2022-04-06 14:19:19,618 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-04-06 14:19:19,623 INFO L356 Elim1Store]: treesize reduction 5, result has 70.6 percent of original size [2022-04-06 14:19:19,623 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 103 treesize of output 81 [2022-04-06 14:19:19,642 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-04-06 14:19:19,643 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 17 [2022-04-06 14:19:19,646 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 30 [2022-04-06 14:19:19,673 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-04-06 14:19:19,674 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 80 treesize of output 76 [2022-04-06 14:19:19,680 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-04-06 14:19:19,681 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 16 [2022-04-06 14:19:19,684 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 28 [2022-04-06 14:19:19,693 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-04-06 14:19:19,697 INFO L356 Elim1Store]: treesize reduction 5, result has 68.8 percent of original size [2022-04-06 14:19:19,698 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 110 treesize of output 89 [2022-04-06 14:19:19,827 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-04-06 14:19:19,827 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [778507227] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 14:19:19,827 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 14:19:19,827 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 11, 10] total 20 [2022-04-06 14:19:19,827 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 14:19:19,827 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [90089873] [2022-04-06 14:19:19,828 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [90089873] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 14:19:19,828 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 14:19:19,828 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-04-06 14:19:19,828 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1966633450] [2022-04-06 14:19:19,828 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 14:19:19,828 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-04-06 14:19:19,828 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 14:19:19,828 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-04-06 14:19:19,828 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=318, Unknown=0, NotChecked=0, Total=380 [2022-04-06 14:19:19,829 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand has 6 states, 6 states have (on average 2.5) internal successors, (15), 5 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 14:19:19,918 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 14:19:19,918 INFO L93 Difference]: Finished difference Result 46 states and 49 transitions. [2022-04-06 14:19:19,918 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-04-06 14:19:19,919 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 5 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 27 [2022-04-06 14:19:19,919 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 14:19:19,919 INFO L225 Difference]: With dead ends: 46 [2022-04-06 14:19:19,919 INFO L226 Difference]: Without dead ends: 35 [2022-04-06 14:19:19,920 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=86, Invalid=420, Unknown=0, NotChecked=0, Total=506 [2022-04-06 14:19:19,920 INFO L913 BasicCegarLoop]: 16 mSDtfsCounter, 31 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 60 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-04-06 14:19:19,920 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [31 Valid, 33 Invalid, 60 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-04-06 14:19:19,920 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2022-04-06 14:19:19,924 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 34. [2022-04-06 14:19:19,924 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 28 states have (on average 1.1071428571428572) internal successors, (31), 28 states have internal predecessors, (31), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-04-06 14:19:19,924 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 36 transitions. [2022-04-06 14:19:19,924 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 36 transitions. Word has length 27 [2022-04-06 14:19:19,924 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 14:19:19,925 INFO L478 AbstractCegarLoop]: Abstraction has 34 states and 36 transitions. [2022-04-06 14:19:19,925 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 5 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 14:19:19,925 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 36 transitions. [2022-04-06 14:19:19,925 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-04-06 14:19:19,925 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 14:19:19,925 INFO L499 BasicCegarLoop]: trace histogram [5, 5, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 14:19:19,961 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2022-04-06 14:19:20,142 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 14:19:20,142 INFO L403 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 14:19:20,142 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 14:19:20,143 INFO L85 PathProgramCache]: Analyzing trace with hash -537357632, now seen corresponding path program 11 times [2022-04-06 14:19:20,143 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 14:19:20,143 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [412018960] [2022-04-06 14:19:20,144 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 14:19:20,144 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-04-06 14:19:20,144 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 14:19:20,144 INFO L85 PathProgramCache]: Analyzing trace with hash -537357632, now seen corresponding path program 12 times [2022-04-06 14:19:20,144 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 14:19:20,144 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [86480593] [2022-04-06 14:19:20,144 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 14:19:20,144 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 14:19:20,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 14:19:20,274 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 14:19:20,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 14:19:20,277 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-04-06 14:19:20,277 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 14:19:20,277 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [86480593] [2022-04-06 14:19:20,277 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [86480593] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 14:19:20,278 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1253963733] [2022-04-06 14:19:20,278 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-04-06 14:19:20,278 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 14:19:20,278 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 14:19:20,279 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 14:19:20,295 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-04-06 14:19:20,371 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2022-04-06 14:19:20,372 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 14:19:20,373 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 12 conjunts are in the unsatisfiable core [2022-04-06 14:19:20,374 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 14:19:20,448 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-04-06 14:19:20,449 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 14:19:20,589 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-04-06 14:19:20,589 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1253963733] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 14:19:20,589 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 14:19:20,589 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 6, 7] total 17 [2022-04-06 14:19:20,590 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 14:19:20,590 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [412018960] [2022-04-06 14:19:20,590 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [412018960] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 14:19:20,590 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 14:19:20,590 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-04-06 14:19:20,590 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [896689950] [2022-04-06 14:19:20,590 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 14:19:20,590 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-04-06 14:19:20,590 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 14:19:20,590 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-04-06 14:19:20,591 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=205, Unknown=0, NotChecked=0, Total=272 [2022-04-06 14:19:20,591 INFO L87 Difference]: Start difference. First operand 34 states and 36 transitions. Second operand has 8 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 14:19:20,770 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 14:19:20,770 INFO L93 Difference]: Finished difference Result 48 states and 51 transitions. [2022-04-06 14:19:20,770 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-04-06 14:19:20,770 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 29 [2022-04-06 14:19:20,771 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 14:19:20,771 INFO L225 Difference]: With dead ends: 48 [2022-04-06 14:19:20,771 INFO L226 Difference]: Without dead ends: 37 [2022-04-06 14:19:20,771 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 50 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=126, Invalid=336, Unknown=0, NotChecked=0, Total=462 [2022-04-06 14:19:20,772 INFO L913 BasicCegarLoop]: 16 mSDtfsCounter, 34 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 91 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 103 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 91 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-06 14:19:20,772 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [34 Valid, 43 Invalid, 103 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 91 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-06 14:19:20,772 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2022-04-06 14:19:20,776 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 36. [2022-04-06 14:19:20,776 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 30 states have (on average 1.1) internal successors, (33), 30 states have internal predecessors, (33), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-04-06 14:19:20,777 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2022-04-06 14:19:20,777 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 29 [2022-04-06 14:19:20,777 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 14:19:20,777 INFO L478 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2022-04-06 14:19:20,777 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 14:19:20,777 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2022-04-06 14:19:20,778 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-04-06 14:19:20,778 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 14:19:20,778 INFO L499 BasicCegarLoop]: trace histogram [5, 5, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 14:19:20,807 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-04-06 14:19:20,987 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 14:19:20,987 INFO L403 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 14:19:20,988 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 14:19:20,988 INFO L85 PathProgramCache]: Analyzing trace with hash -1008022850, now seen corresponding path program 13 times [2022-04-06 14:19:20,988 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 14:19:20,988 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1845762562] [2022-04-06 14:19:20,989 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 14:19:20,989 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-04-06 14:19:20,989 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 14:19:20,989 INFO L85 PathProgramCache]: Analyzing trace with hash -1008022850, now seen corresponding path program 14 times [2022-04-06 14:19:20,989 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 14:19:20,990 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [305135182] [2022-04-06 14:19:20,990 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 14:19:20,990 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 14:19:21,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 14:19:21,243 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 14:19:21,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 14:19:21,247 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-04-06 14:19:21,247 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 14:19:21,247 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [305135182] [2022-04-06 14:19:21,247 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [305135182] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 14:19:21,247 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1986268470] [2022-04-06 14:19:21,247 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 14:19:21,248 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 14:19:21,248 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 14:19:21,249 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 14:19:21,250 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-04-06 14:19:21,302 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 14:19:21,302 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 14:19:21,303 INFO L263 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 39 conjunts are in the unsatisfiable core [2022-04-06 14:19:21,306 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 14:19:21,315 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-04-06 14:19:21,590 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 19 [2022-04-06 14:19:21,951 INFO L173 IndexEqualityManager]: detected equality via solver [2022-04-06 14:19:21,957 INFO L356 Elim1Store]: treesize reduction 15, result has 16.7 percent of original size [2022-04-06 14:19:21,957 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 44 treesize of output 13 [2022-04-06 14:19:22,033 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-04-06 14:19:22,034 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 14:19:22,194 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-04-06 14:19:22,194 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 80 treesize of output 76 [2022-04-06 14:19:22,228 INFO L356 Elim1Store]: treesize reduction 27, result has 34.1 percent of original size [2022-04-06 14:19:22,228 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 48 treesize of output 45 [2022-04-06 14:19:22,234 INFO L356 Elim1Store]: treesize reduction 9, result has 10.0 percent of original size [2022-04-06 14:19:22,235 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 22 treesize of output 1 [2022-04-06 14:19:22,241 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-04-06 14:19:22,241 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 82 treesize of output 78 [2022-04-06 14:19:22,273 INFO L356 Elim1Store]: treesize reduction 27, result has 37.2 percent of original size [2022-04-06 14:19:22,273 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 51 treesize of output 49 [2022-04-06 14:19:22,280 INFO L356 Elim1Store]: treesize reduction 9, result has 10.0 percent of original size [2022-04-06 14:19:22,280 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 1 [2022-04-06 14:19:22,461 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-04-06 14:19:22,461 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1986268470] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 14:19:22,461 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 14:19:22,461 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 15, 14] total 31 [2022-04-06 14:19:22,463 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 14:19:22,464 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1845762562] [2022-04-06 14:19:22,464 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1845762562] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 14:19:22,464 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 14:19:22,464 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-04-06 14:19:22,464 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [16312542] [2022-04-06 14:19:22,464 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 14:19:22,464 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-04-06 14:19:22,464 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 14:19:22,464 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-04-06 14:19:22,465 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=811, Unknown=0, NotChecked=0, Total=930 [2022-04-06 14:19:22,466 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 8 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 14:19:22,632 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 14:19:22,632 INFO L93 Difference]: Finished difference Result 50 states and 53 transitions. [2022-04-06 14:19:22,632 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-04-06 14:19:22,633 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 8 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 31 [2022-04-06 14:19:22,633 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 14:19:22,633 INFO L225 Difference]: With dead ends: 50 [2022-04-06 14:19:22,633 INFO L226 Difference]: Without dead ends: 39 [2022-04-06 14:19:22,634 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 266 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=196, Invalid=1136, Unknown=0, NotChecked=0, Total=1332 [2022-04-06 14:19:22,634 INFO L913 BasicCegarLoop]: 16 mSDtfsCounter, 38 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 91 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 109 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 91 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-06 14:19:22,634 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 43 Invalid, 109 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 91 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-06 14:19:22,635 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2022-04-06 14:19:22,639 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 38. [2022-04-06 14:19:22,639 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 32 states have (on average 1.09375) internal successors, (35), 32 states have internal predecessors, (35), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-04-06 14:19:22,639 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2022-04-06 14:19:22,639 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 31 [2022-04-06 14:19:22,639 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 14:19:22,639 INFO L478 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2022-04-06 14:19:22,639 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 8 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 14:19:22,640 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2022-04-06 14:19:22,640 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-04-06 14:19:22,640 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 14:19:22,640 INFO L499 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 14:19:22,672 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2022-04-06 14:19:22,840 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 14:19:22,841 INFO L403 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 14:19:22,841 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 14:19:22,841 INFO L85 PathProgramCache]: Analyzing trace with hash 1949236028, now seen corresponding path program 15 times [2022-04-06 14:19:22,841 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 14:19:22,841 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [421431948] [2022-04-06 14:19:22,842 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 14:19:22,842 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-04-06 14:19:22,842 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 14:19:22,842 INFO L85 PathProgramCache]: Analyzing trace with hash 1949236028, now seen corresponding path program 16 times [2022-04-06 14:19:22,843 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 14:19:22,843 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1326261284] [2022-04-06 14:19:22,843 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 14:19:22,843 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 14:19:22,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 14:19:22,983 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 14:19:22,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 14:19:22,985 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-04-06 14:19:22,985 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 14:19:22,985 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1326261284] [2022-04-06 14:19:22,985 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1326261284] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 14:19:22,985 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1958462587] [2022-04-06 14:19:22,986 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-04-06 14:19:22,986 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 14:19:22,986 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 14:19:22,986 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 14:19:22,995 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-04-06 14:19:23,053 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-04-06 14:19:23,053 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 14:19:23,054 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 42 conjunts are in the unsatisfiable core [2022-04-06 14:19:23,057 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 14:19:23,068 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-04-06 14:19:23,405 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 19 [2022-04-06 14:19:23,662 INFO L173 IndexEqualityManager]: detected equality via solver [2022-04-06 14:19:23,666 INFO L356 Elim1Store]: treesize reduction 15, result has 16.7 percent of original size [2022-04-06 14:19:23,667 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 40 treesize of output 13 [2022-04-06 14:19:23,721 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-04-06 14:19:23,721 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 14:19:23,912 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-04-06 14:19:23,912 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 80 treesize of output 76 [2022-04-06 14:19:23,956 INFO L356 Elim1Store]: treesize reduction 5, result has 68.8 percent of original size [2022-04-06 14:19:23,957 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 40 treesize of output 39 [2022-04-06 14:19:23,961 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 16 [2022-04-06 14:19:23,964 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 28 [2022-04-06 14:19:23,973 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-04-06 14:19:23,974 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 82 treesize of output 78 [2022-04-06 14:19:24,022 INFO L356 Elim1Store]: treesize reduction 5, result has 70.6 percent of original size [2022-04-06 14:19:24,023 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 43 treesize of output 42 [2022-04-06 14:19:24,041 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 17 [2022-04-06 14:19:24,044 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 30 [2022-04-06 14:19:24,392 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-04-06 14:19:24,393 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1958462587] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 14:19:24,393 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 14:19:24,393 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 17, 16] total 36 [2022-04-06 14:19:24,393 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 14:19:24,393 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [421431948] [2022-04-06 14:19:24,393 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [421431948] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 14:19:24,393 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 14:19:24,393 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2022-04-06 14:19:24,393 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1304618787] [2022-04-06 14:19:24,393 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 14:19:24,394 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-04-06 14:19:24,394 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 14:19:24,394 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-04-06 14:19:24,394 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=145, Invalid=1115, Unknown=0, NotChecked=0, Total=1260 [2022-04-06 14:19:24,395 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand has 10 states, 10 states have (on average 2.1) internal successors, (21), 9 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 14:19:24,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 14:19:24,740 INFO L93 Difference]: Finished difference Result 63 states and 69 transitions. [2022-04-06 14:19:24,740 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-04-06 14:19:24,740 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.1) internal successors, (21), 9 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 33 [2022-04-06 14:19:24,740 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 14:19:24,741 INFO L225 Difference]: With dead ends: 63 [2022-04-06 14:19:24,741 INFO L226 Difference]: Without dead ends: 52 [2022-04-06 14:19:24,742 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 384 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=242, Invalid=1564, Unknown=0, NotChecked=0, Total=1806 [2022-04-06 14:19:24,742 INFO L913 BasicCegarLoop]: 20 mSDtfsCounter, 55 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 162 mSolverCounterSat, 59 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 221 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 59 IncrementalHoareTripleChecker+Valid, 162 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-06 14:19:24,742 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [55 Valid, 52 Invalid, 221 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [59 Valid, 162 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-06 14:19:24,743 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2022-04-06 14:19:24,749 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 40. [2022-04-06 14:19:24,750 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 34 states have (on average 1.088235294117647) internal successors, (37), 34 states have internal predecessors, (37), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-04-06 14:19:24,750 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2022-04-06 14:19:24,750 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 33 [2022-04-06 14:19:24,750 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 14:19:24,750 INFO L478 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2022-04-06 14:19:24,750 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.1) internal successors, (21), 9 states have internal predecessors, (21), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 14:19:24,750 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2022-04-06 14:19:24,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-04-06 14:19:24,751 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 14:19:24,751 INFO L499 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 14:19:24,767 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-04-06 14:19:24,968 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-04-06 14:19:24,969 INFO L403 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 14:19:24,969 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 14:19:24,969 INFO L85 PathProgramCache]: Analyzing trace with hash 606667834, now seen corresponding path program 17 times [2022-04-06 14:19:24,969 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 14:19:24,969 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [770438777] [2022-04-06 14:19:24,970 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 14:19:24,970 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-04-06 14:19:24,970 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 14:19:24,970 INFO L85 PathProgramCache]: Analyzing trace with hash 606667834, now seen corresponding path program 18 times [2022-04-06 14:19:24,970 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 14:19:24,970 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1844582513] [2022-04-06 14:19:24,970 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 14:19:24,971 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 14:19:24,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 14:19:25,816 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 14:19:25,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 14:19:25,819 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 44 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-04-06 14:19:25,820 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 14:19:25,820 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1844582513] [2022-04-06 14:19:25,820 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1844582513] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 14:19:25,820 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1372324619] [2022-04-06 14:19:25,821 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-04-06 14:19:25,821 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 14:19:25,821 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 14:19:25,831 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 14:19:25,832 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-04-06 14:19:25,961 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 6 check-sat command(s) [2022-04-06 14:19:25,961 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 14:19:25,963 INFO L263 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 56 conjunts are in the unsatisfiable core [2022-04-06 14:19:25,965 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 14:19:25,977 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-04-06 14:19:26,569 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 19 [2022-04-06 14:19:26,863 INFO L173 IndexEqualityManager]: detected equality via solver [2022-04-06 14:19:26,868 INFO L356 Elim1Store]: treesize reduction 15, result has 16.7 percent of original size [2022-04-06 14:19:26,868 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 44 treesize of output 13 [2022-04-06 14:19:26,908 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-04-06 14:19:26,908 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 14:19:27,061 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-04-06 14:19:27,062 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 80 treesize of output 76 [2022-04-06 14:19:27,091 INFO L356 Elim1Store]: treesize reduction 6, result has 40.0 percent of original size [2022-04-06 14:19:27,092 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 22 treesize of output 21 [2022-04-06 14:19:27,094 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 28 [2022-04-06 14:19:27,104 INFO L356 Elim1Store]: treesize reduction 25, result has 39.0 percent of original size [2022-04-06 14:19:27,104 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 48 treesize of output 47 [2022-04-06 14:19:27,113 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-04-06 14:19:27,113 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 82 treesize of output 78 [2022-04-06 14:19:27,146 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 17 [2022-04-06 14:19:27,148 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 30 [2022-04-06 14:19:27,155 INFO L356 Elim1Store]: treesize reduction 5, result has 70.6 percent of original size [2022-04-06 14:19:27,155 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 43 treesize of output 42 [2022-04-06 14:19:27,651 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-04-06 14:19:27,651 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1372324619] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 14:19:27,652 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 14:19:27,652 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 23, 18] total 54 [2022-04-06 14:19:27,652 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 14:19:27,652 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [770438777] [2022-04-06 14:19:27,652 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [770438777] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 14:19:27,652 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 14:19:27,652 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2022-04-06 14:19:27,652 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1767967805] [2022-04-06 14:19:27,652 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 14:19:27,653 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-04-06 14:19:27,653 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 14:19:27,653 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-04-06 14:19:27,654 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=358, Invalid=2504, Unknown=0, NotChecked=0, Total=2862 [2022-04-06 14:19:27,654 INFO L87 Difference]: Start difference. First operand 40 states and 42 transitions. Second operand has 21 states, 20 states have (on average 1.4) internal successors, (28), 19 states have internal predecessors, (28), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 14:19:29,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 14:19:29,336 INFO L93 Difference]: Finished difference Result 70 states and 77 transitions. [2022-04-06 14:19:29,336 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-04-06 14:19:29,336 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 1.4) internal successors, (28), 19 states have internal predecessors, (28), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 35 [2022-04-06 14:19:29,336 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 14:19:29,337 INFO L225 Difference]: With dead ends: 70 [2022-04-06 14:19:29,337 INFO L226 Difference]: Without dead ends: 68 [2022-04-06 14:19:29,338 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 38 SyntacticMatches, 5 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1563 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=849, Invalid=5471, Unknown=0, NotChecked=0, Total=6320 [2022-04-06 14:19:29,339 INFO L913 BasicCegarLoop]: 18 mSDtfsCounter, 90 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 557 mSolverCounterSat, 127 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 90 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 684 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 127 IncrementalHoareTripleChecker+Valid, 557 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-04-06 14:19:29,339 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [90 Valid, 63 Invalid, 684 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [127 Valid, 557 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-04-06 14:19:29,339 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2022-04-06 14:19:29,355 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 46. [2022-04-06 14:19:29,355 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 38 states have (on average 1.0789473684210527) internal successors, (41), 39 states have internal predecessors, (41), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2022-04-06 14:19:29,358 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 48 transitions. [2022-04-06 14:19:29,358 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 48 transitions. Word has length 35 [2022-04-06 14:19:29,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 14:19:29,360 INFO L478 AbstractCegarLoop]: Abstraction has 46 states and 48 transitions. [2022-04-06 14:19:29,360 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 20 states have (on average 1.4) internal successors, (28), 19 states have internal predecessors, (28), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-04-06 14:19:29,360 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 48 transitions. [2022-04-06 14:19:29,360 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-04-06 14:19:29,360 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 14:19:29,360 INFO L499 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 14:19:29,377 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-04-06 14:19:29,575 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 14:19:29,575 INFO L403 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 14:19:29,576 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 14:19:29,576 INFO L85 PathProgramCache]: Analyzing trace with hash 758259348, now seen corresponding path program 1 times [2022-04-06 14:19:29,576 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 14:19:29,576 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1305680748] [2022-04-06 14:19:29,577 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 14:19:29,577 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-04-06 14:19:29,577 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 14:19:29,577 INFO L85 PathProgramCache]: Analyzing trace with hash 758259348, now seen corresponding path program 2 times [2022-04-06 14:19:29,577 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 14:19:29,577 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2045467038] [2022-04-06 14:19:29,577 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 14:19:29,578 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 14:19:29,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 14:19:30,621 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 14:19:30,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 14:19:30,632 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2022-04-06 14:19:30,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 14:19:30,650 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 2 proven. 36 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-04-06 14:19:30,651 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 14:19:30,651 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2045467038] [2022-04-06 14:19:30,651 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2045467038] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 14:19:30,651 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [733316699] [2022-04-06 14:19:30,651 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 14:19:30,651 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 14:19:30,651 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 14:19:30,652 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 14:19:30,678 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-04-06 14:19:30,724 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 14:19:30,724 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 14:19:30,725 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 53 conjunts are in the unsatisfiable core [2022-04-06 14:19:30,735 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 14:19:30,749 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-04-06 14:19:31,121 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 20 [2022-04-06 14:19:31,288 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-04-06 14:19:32,231 WARN L855 $PredicateComparison]: unable to prove that (exists ((|v_main_~#str2~0.base_BEFORE_CALL_1| Int) (|v_main_~#str1~0.base_BEFORE_CALL_1| Int)) (and (not (= |v_main_~#str2~0.base_BEFORE_CALL_1| |v_main_~#str1~0.base_BEFORE_CALL_1|)) (= (select (select |c_#memory_int| |v_main_~#str2~0.base_BEFORE_CALL_1|) 3) (select (select |c_#memory_int| |v_main_~#str1~0.base_BEFORE_CALL_1|) 1)))) is different from true [2022-04-06 14:19:32,579 INFO L173 IndexEqualityManager]: detected equality via solver [2022-04-06 14:19:32,580 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 10 [2022-04-06 14:19:32,652 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 25 trivial. 2 not checked. [2022-04-06 14:19:32,652 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 14:19:33,049 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-04-06 14:19:33,050 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 218 treesize of output 206 [2022-04-06 14:19:33,302 INFO L356 Elim1Store]: treesize reduction 31, result has 34.0 percent of original size [2022-04-06 14:19:33,303 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 505 treesize of output 436 [2022-04-06 14:19:33,403 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-04-06 14:19:33,404 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 71 treesize of output 59 [2022-04-06 14:19:33,412 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 218 treesize of output 200 [2022-04-06 14:19:33,466 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-04-06 14:19:33,467 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 23 [2022-04-06 14:19:33,470 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 105 treesize of output 96 [2022-04-06 14:19:33,485 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-04-06 14:19:33,490 INFO L356 Elim1Store]: treesize reduction 5, result has 70.6 percent of original size [2022-04-06 14:19:33,491 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 284 treesize of output 230 [2022-04-06 14:19:33,533 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-04-06 14:19:33,534 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 23 [2022-04-06 14:19:33,538 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 105 treesize of output 96 [2022-04-06 14:19:33,587 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-04-06 14:19:33,587 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 218 treesize of output 206 [2022-04-06 14:19:33,786 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-04-06 14:19:33,790 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-04-06 14:19:33,790 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 515 treesize of output 440 [2022-04-06 14:19:34,117 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-04-06 14:19:34,118 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 23 [2022-04-06 14:19:34,121 INFO L173 IndexEqualityManager]: detected equality via solver [2022-04-06 14:19:34,122 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 30 [2022-04-06 14:19:35,054 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 2 proven. 27 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-04-06 14:19:35,054 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [733316699] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 14:19:35,054 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 14:19:35,054 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22, 21] total 50 [2022-04-06 14:19:35,054 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 14:19:35,054 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1305680748] [2022-04-06 14:19:35,054 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1305680748] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 14:19:35,054 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 14:19:35,055 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2022-04-06 14:19:35,055 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [476908693] [2022-04-06 14:19:35,055 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 14:19:35,055 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-04-06 14:19:35,055 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 14:19:35,055 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-04-06 14:19:35,056 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=310, Invalid=2045, Unknown=1, NotChecked=94, Total=2450 [2022-04-06 14:19:35,056 INFO L87 Difference]: Start difference. First operand 46 states and 48 transitions. Second operand has 23 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 21 states have internal predecessors, (31), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-04-06 14:19:36,871 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 14:19:36,871 INFO L93 Difference]: Finished difference Result 72 states and 78 transitions. [2022-04-06 14:19:36,871 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-04-06 14:19:36,871 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 21 states have internal predecessors, (31), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 43 [2022-04-06 14:19:36,872 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 14:19:36,872 INFO L225 Difference]: With dead ends: 72 [2022-04-06 14:19:36,872 INFO L226 Difference]: Without dead ends: 70 [2022-04-06 14:19:36,873 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 57 SyntacticMatches, 7 SemanticMatches, 76 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 1653 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=755, Invalid=5100, Unknown=1, NotChecked=150, Total=6006 [2022-04-06 14:19:36,874 INFO L913 BasicCegarLoop]: 14 mSDtfsCounter, 51 mSDsluCounter, 59 mSDsCounter, 0 mSdLazyCounter, 600 mSolverCounterSat, 136 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 736 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 136 IncrementalHoareTripleChecker+Valid, 600 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-04-06 14:19:36,874 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [51 Valid, 73 Invalid, 736 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [136 Valid, 600 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-04-06 14:19:36,874 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2022-04-06 14:19:36,896 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 59. [2022-04-06 14:19:36,897 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 48 states have (on average 1.0833333333333333) internal successors, (52), 50 states have internal predecessors, (52), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (5), 3 states have call predecessors, (5), 5 states have call successors, (5) [2022-04-06 14:19:36,898 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 63 transitions. [2022-04-06 14:19:36,898 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 63 transitions. Word has length 43 [2022-04-06 14:19:36,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 14:19:36,898 INFO L478 AbstractCegarLoop]: Abstraction has 59 states and 63 transitions. [2022-04-06 14:19:36,898 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 21 states have internal predecessors, (31), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-04-06 14:19:36,898 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 63 transitions. [2022-04-06 14:19:36,904 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-04-06 14:19:36,904 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 14:19:36,904 INFO L499 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 14:19:36,923 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-04-06 14:19:37,120 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-04-06 14:19:37,121 INFO L403 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 14:19:37,121 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 14:19:37,121 INFO L85 PathProgramCache]: Analyzing trace with hash -1926528494, now seen corresponding path program 3 times [2022-04-06 14:19:37,121 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 14:19:37,121 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2116371282] [2022-04-06 14:19:37,122 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 14:19:37,122 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-04-06 14:19:37,122 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 14:19:37,122 INFO L85 PathProgramCache]: Analyzing trace with hash -1926528494, now seen corresponding path program 4 times [2022-04-06 14:19:37,122 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 14:19:37,122 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [406545188] [2022-04-06 14:19:37,122 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 14:19:37,122 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 14:19:37,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 14:19:37,298 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 14:19:37,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 14:19:37,314 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2022-04-06 14:19:37,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 14:19:37,316 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 29 proven. 9 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2022-04-06 14:19:37,317 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 14:19:37,317 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [406545188] [2022-04-06 14:19:37,317 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [406545188] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 14:19:37,317 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [861615704] [2022-04-06 14:19:37,317 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-04-06 14:19:37,317 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 14:19:37,317 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 14:19:37,318 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 14:19:37,319 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-04-06 14:19:37,410 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-04-06 14:19:37,410 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 14:19:37,417 INFO L263 TraceCheckSpWp]: Trace formula consists of 216 conjuncts, 56 conjunts are in the unsatisfiable core [2022-04-06 14:19:37,420 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 14:19:37,427 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-04-06 14:19:37,775 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 19 [2022-04-06 14:19:37,866 INFO L356 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2022-04-06 14:19:37,866 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 32 [2022-04-06 14:19:40,165 WARN L855 $PredicateComparison]: unable to prove that (exists ((aux_mod_aux_mod_aux_mod_aux_mod_v_main_~j~0_BEFORE_CALL_3_56_119_154_172 Int) (|v_main_~#str2~0.base_BEFORE_CALL_3| Int) (aux_div_aux_mod_aux_mod_aux_mod_v_main_~j~0_BEFORE_CALL_3_56_119_154_172 Int) (aux_div_aux_mod_v_main_~j~0_BEFORE_CALL_3_56_119 Int) (aux_div_aux_mod_aux_mod_v_main_~j~0_BEFORE_CALL_3_56_119_154 Int) (|v_main_~#str2~0.offset_BEFORE_CALL_3| Int) (|v_main_~#str1~0.base_BEFORE_CALL_3| Int) (aux_div_v_main_~j~0_BEFORE_CALL_3_56 Int)) (let ((.cse1 (* aux_div_aux_mod_aux_mod_aux_mod_v_main_~j~0_BEFORE_CALL_3_56_119_154_172 4294967296))) (let ((.cse0 (+ .cse1 aux_mod_aux_mod_aux_mod_aux_mod_v_main_~j~0_BEFORE_CALL_3_56_119_154_172))) (and (<= .cse0 (+ (* 4294967296 aux_div_aux_mod_v_main_~j~0_BEFORE_CALL_3_56_119) 5)) (<= .cse0 (* aux_div_v_main_~j~0_BEFORE_CALL_3_56 4294967296)) (< 0 (+ 4294967291 .cse1 aux_mod_aux_mod_aux_mod_aux_mod_v_main_~j~0_BEFORE_CALL_3_56_119_154_172)) (< aux_div_v_main_~j~0_BEFORE_CALL_3_56 (+ aux_div_aux_mod_aux_mod_v_main_~j~0_BEFORE_CALL_3_56_119_154 1)) (= (select (select |c_#memory_int| |v_main_~#str1~0.base_BEFORE_CALL_3|) (+ (mod (+ (* 4294967295 aux_mod_aux_mod_aux_mod_aux_mod_v_main_~j~0_BEFORE_CALL_3_56_119_154_172) 5) 4294967296) (- 4))) (select (select |c_#memory_int| |v_main_~#str2~0.base_BEFORE_CALL_3|) (+ |v_main_~#str2~0.offset_BEFORE_CALL_3| 4))) (<= .cse0 5) (not (= |v_main_~#str2~0.base_BEFORE_CALL_3| |v_main_~#str1~0.base_BEFORE_CALL_3|)) (< aux_div_aux_mod_v_main_~j~0_BEFORE_CALL_3_56_119 (+ aux_div_aux_mod_aux_mod_aux_mod_v_main_~j~0_BEFORE_CALL_3_56_119_154_172 1)) (<= 0 aux_mod_aux_mod_aux_mod_aux_mod_v_main_~j~0_BEFORE_CALL_3_56_119_154_172) (<= (* aux_div_aux_mod_aux_mod_v_main_~j~0_BEFORE_CALL_3_56_119_154 4294967296) (+ 4294967290 .cse1 aux_mod_aux_mod_aux_mod_aux_mod_v_main_~j~0_BEFORE_CALL_3_56_119_154_172)))))) is different from true [2022-04-06 14:19:41,049 INFO L173 IndexEqualityManager]: detected equality via solver [2022-04-06 14:19:41,061 INFO L356 Elim1Store]: treesize reduction 15, result has 16.7 percent of original size [2022-04-06 14:19:41,061 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 44 treesize of output 13 [2022-04-06 14:19:41,143 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 25 trivial. 2 not checked. [2022-04-06 14:19:41,143 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 14:19:41,657 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-04-06 14:19:41,657 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 218 treesize of output 206 [2022-04-06 14:19:42,012 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 59 treesize of output 47 [2022-04-06 14:19:42,015 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 436 treesize of output 400 [2022-04-06 14:19:42,041 INFO L356 Elim1Store]: treesize reduction 5, result has 70.6 percent of original size [2022-04-06 14:19:42,041 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 221 treesize of output 199 [2022-04-06 14:19:42,070 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 23 [2022-04-06 14:19:42,075 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 236 treesize of output 218 [2022-04-06 14:19:42,118 INFO L356 Elim1Store]: treesize reduction 16, result has 5.9 percent of original size [2022-04-06 14:19:42,119 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 117 treesize of output 96 [2022-04-06 14:19:42,147 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 23 [2022-04-06 14:19:42,152 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 105 treesize of output 96 [2022-04-06 14:19:42,200 INFO L356 Elim1Store]: treesize reduction 19, result has 5.0 percent of original size [2022-04-06 14:19:42,200 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 233 treesize of output 201 [2022-04-06 14:19:42,220 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-04-06 14:19:42,221 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 218 treesize of output 206 [2022-04-06 14:19:42,614 INFO L356 Elim1Store]: treesize reduction 8, result has 33.3 percent of original size [2022-04-06 14:19:42,615 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 70 treesize of output 58 [2022-04-06 14:19:42,618 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 105 treesize of output 96 [2022-04-06 14:19:42,643 INFO L356 Elim1Store]: treesize reduction 30, result has 36.2 percent of original size [2022-04-06 14:19:42,643 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 373 treesize of output 326 [2022-04-06 14:19:43,363 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 2 proven. 38 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-04-06 14:19:43,363 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [861615704] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 14:19:43,363 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 14:19:43,363 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 24, 23] total 50 [2022-04-06 14:19:43,364 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 14:19:43,365 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2116371282] [2022-04-06 14:19:43,365 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2116371282] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 14:19:43,365 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 14:19:43,365 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2022-04-06 14:19:43,365 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1304312169] [2022-04-06 14:19:43,365 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 14:19:43,365 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-04-06 14:19:43,365 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 14:19:43,365 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-04-06 14:19:43,366 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=282, Invalid=2073, Unknown=1, NotChecked=94, Total=2450 [2022-04-06 14:19:43,367 INFO L87 Difference]: Start difference. First operand 59 states and 63 transitions. Second operand has 10 states, 10 states have (on average 3.0) internal successors, (30), 9 states have internal predecessors, (30), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-04-06 14:19:43,661 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 14:19:43,661 INFO L93 Difference]: Finished difference Result 83 states and 88 transitions. [2022-04-06 14:19:43,662 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-04-06 14:19:43,662 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.0) internal successors, (30), 9 states have internal predecessors, (30), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 45 [2022-04-06 14:19:43,662 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 14:19:43,662 INFO L225 Difference]: With dead ends: 83 [2022-04-06 14:19:43,662 INFO L226 Difference]: Without dead ends: 64 [2022-04-06 14:19:43,663 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 53 SyntacticMatches, 2 SemanticMatches, 55 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 877 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=384, Invalid=2699, Unknown=1, NotChecked=108, Total=3192 [2022-04-06 14:19:43,663 INFO L913 BasicCegarLoop]: 13 mSDtfsCounter, 71 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 109 mSolverCounterSat, 59 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 71 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 168 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 59 IncrementalHoareTripleChecker+Valid, 109 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-04-06 14:19:43,664 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [71 Valid, 30 Invalid, 168 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [59 Valid, 109 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-04-06 14:19:43,664 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2022-04-06 14:19:43,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 54. [2022-04-06 14:19:43,684 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 44 states have (on average 1.0454545454545454) internal successors, (46), 45 states have internal predecessors, (46), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2022-04-06 14:19:43,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 55 transitions. [2022-04-06 14:19:43,686 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 55 transitions. Word has length 45 [2022-04-06 14:19:43,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 14:19:43,686 INFO L478 AbstractCegarLoop]: Abstraction has 54 states and 55 transitions. [2022-04-06 14:19:43,686 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 3.0) internal successors, (30), 9 states have internal predecessors, (30), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-04-06 14:19:43,686 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 55 transitions. [2022-04-06 14:19:43,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2022-04-06 14:19:43,689 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 14:19:43,689 INFO L499 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 14:19:43,705 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-04-06 14:19:43,905 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-04-06 14:19:43,906 INFO L403 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 14:19:43,906 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 14:19:43,906 INFO L85 PathProgramCache]: Analyzing trace with hash 814759662, now seen corresponding path program 5 times [2022-04-06 14:19:43,906 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 14:19:43,906 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1981794658] [2022-04-06 14:19:43,907 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 14:19:43,907 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-04-06 14:19:43,907 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 14:19:43,907 INFO L85 PathProgramCache]: Analyzing trace with hash 814759662, now seen corresponding path program 6 times [2022-04-06 14:19:43,907 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 14:19:43,907 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1049549747] [2022-04-06 14:19:43,908 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 14:19:43,908 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 14:19:43,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 14:19:45,005 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 14:19:45,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 14:19:45,009 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2022-04-06 14:19:45,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 14:19:45,016 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 39 [2022-04-06 14:19:45,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 14:19:45,019 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 4 proven. 33 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2022-04-06 14:19:45,019 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 14:19:45,019 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1049549747] [2022-04-06 14:19:45,019 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1049549747] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 14:19:45,020 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1813939136] [2022-04-06 14:19:45,020 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-04-06 14:19:45,020 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 14:19:45,020 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 14:19:45,036 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 14:19:45,037 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-04-06 14:19:45,208 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 6 check-sat command(s) [2022-04-06 14:19:45,208 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 14:19:45,220 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 63 conjunts are in the unsatisfiable core [2022-04-06 14:19:45,222 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 14:19:45,239 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-04-06 14:19:45,530 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 20 [2022-04-06 14:19:45,700 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-04-06 14:19:45,701 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-04-06 14:19:45,967 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-04-06 14:19:45,968 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-04-06 14:19:46,951 WARN L855 $PredicateComparison]: unable to prove that (exists ((|v_main_~#str2~0.base_BEFORE_CALL_5| Int) (|v_main_~#str1~0.base_BEFORE_CALL_5| Int)) (and (= (select (select |c_#memory_int| |v_main_~#str1~0.base_BEFORE_CALL_5|) 2) (select (select |c_#memory_int| |v_main_~#str2~0.base_BEFORE_CALL_5|) 2)) (not (= |v_main_~#str2~0.base_BEFORE_CALL_5| |v_main_~#str1~0.base_BEFORE_CALL_5|)))) is different from true [2022-04-06 14:19:47,641 WARN L855 $PredicateComparison]: unable to prove that (exists ((|v_main_~#str1~0.base_BEFORE_CALL_6| Int) (|v_main_~#str2~0.base_BEFORE_CALL_6| Int)) (and (not (= |v_main_~#str2~0.base_BEFORE_CALL_6| |v_main_~#str1~0.base_BEFORE_CALL_6|)) (= (select (select |c_#memory_int| |v_main_~#str1~0.base_BEFORE_CALL_6|) 2) (select (select |c_#memory_int| |v_main_~#str2~0.base_BEFORE_CALL_6|) 2)))) is different from true [2022-04-06 14:19:47,802 INFO L173 IndexEqualityManager]: detected equality via solver [2022-04-06 14:19:47,802 INFO L173 IndexEqualityManager]: detected equality via solver [2022-04-06 14:19:47,803 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 10 [2022-04-06 14:19:47,840 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 9 trivial. 8 not checked. [2022-04-06 14:19:47,840 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 14:19:50,603 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-04-06 14:19:50,603 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 988 treesize of output 925 [2022-04-06 14:19:56,054 INFO L356 Elim1Store]: treesize reduction 8, result has 33.3 percent of original size [2022-04-06 14:19:56,055 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 154 treesize of output 142 [2022-04-06 14:19:56,060 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5688 treesize of output 5472 [2022-04-06 14:21:04,577 INFO L356 Elim1Store]: treesize reduction 8, result has 33.3 percent of original size [2022-04-06 14:21:04,577 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 154 treesize of output 142 [2022-04-06 14:21:04,583 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 1446 treesize of output 1392 [2022-04-06 14:21:08,516 INFO L356 Elim1Store]: treesize reduction 31, result has 34.0 percent of original size [2022-04-06 14:21:08,516 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 3087 treesize of output 2818 [2022-04-06 14:21:10,854 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-04-06 14:21:10,860 INFO L356 Elim1Store]: treesize reduction 5, result has 70.6 percent of original size [2022-04-06 14:21:10,861 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 1542 treesize of output 1404 [2022-04-06 14:21:16,559 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 4 proven. 33 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2022-04-06 14:21:16,559 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1813939136] provided 0 perfect and 2 imperfect interpolant sequences [2022-04-06 14:21:16,559 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-04-06 14:21:16,559 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 27, 23] total 57 [2022-04-06 14:21:16,560 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-04-06 14:21:16,561 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1981794658] [2022-04-06 14:21:16,561 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1981794658] provided 1 perfect and 0 imperfect interpolant sequences [2022-04-06 14:21:16,561 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-04-06 14:21:16,561 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2022-04-06 14:21:16,561 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [336548486] [2022-04-06 14:21:16,561 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-04-06 14:21:16,562 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-04-06 14:21:16,562 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-04-06 14:21:16,562 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-04-06 14:21:16,563 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=342, Invalid=2634, Unknown=2, NotChecked=214, Total=3192 [2022-04-06 14:21:16,563 INFO L87 Difference]: Start difference. First operand 54 states and 55 transitions. Second operand has 24 states, 23 states have (on average 1.391304347826087) internal successors, (32), 22 states have internal predecessors, (32), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-04-06 14:21:18,071 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-04-06 14:21:18,071 INFO L93 Difference]: Finished difference Result 65 states and 66 transitions. [2022-04-06 14:21:18,071 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-04-06 14:21:18,072 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 1.391304347826087) internal successors, (32), 22 states have internal predecessors, (32), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 51 [2022-04-06 14:21:18,072 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-04-06 14:21:18,072 INFO L225 Difference]: With dead ends: 65 [2022-04-06 14:21:18,072 INFO L226 Difference]: Without dead ends: 63 [2022-04-06 14:21:18,073 INFO L912 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 66 SyntacticMatches, 9 SemanticMatches, 76 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 1598 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=716, Invalid=4990, Unknown=2, NotChecked=298, Total=6006 [2022-04-06 14:21:18,074 INFO L913 BasicCegarLoop]: 15 mSDtfsCounter, 38 mSDsluCounter, 51 mSDsCounter, 0 mSdLazyCounter, 646 mSolverCounterSat, 97 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 66 SdHoareTripleChecker+Invalid, 743 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 97 IncrementalHoareTripleChecker+Valid, 646 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-04-06 14:21:18,074 INFO L914 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 66 Invalid, 743 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [97 Valid, 646 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-04-06 14:21:18,074 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2022-04-06 14:21:18,092 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 62. [2022-04-06 14:21:18,092 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 50 states have (on average 1.04) internal successors, (52), 51 states have internal predecessors, (52), 6 states have call successors, (6), 6 states have call predecessors, (6), 5 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2022-04-06 14:21:18,092 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 63 transitions. [2022-04-06 14:21:18,092 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 63 transitions. Word has length 51 [2022-04-06 14:21:18,093 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-04-06 14:21:18,093 INFO L478 AbstractCegarLoop]: Abstraction has 62 states and 63 transitions. [2022-04-06 14:21:18,093 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 23 states have (on average 1.391304347826087) internal successors, (32), 22 states have internal predecessors, (32), 4 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-04-06 14:21:18,093 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 63 transitions. [2022-04-06 14:21:18,094 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-04-06 14:21:18,094 INFO L491 BasicCegarLoop]: Found error trace [2022-04-06 14:21:18,094 INFO L499 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-04-06 14:21:18,112 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-04-06 14:21:18,310 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-04-06 14:21:18,310 INFO L403 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-04-06 14:21:18,310 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-04-06 14:21:18,310 INFO L85 PathProgramCache]: Analyzing trace with hash -1545771704, now seen corresponding path program 7 times [2022-04-06 14:21:18,310 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-04-06 14:21:18,311 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [978615965] [2022-04-06 14:21:18,311 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, -1 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2022-04-06 14:21:18,311 WARN L91 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2022-04-06 14:21:18,311 INFO L274 tedInterpolationCore]: Could not compute an accelerate. [2022-04-06 14:21:18,312 INFO L85 PathProgramCache]: Analyzing trace with hash -1545771704, now seen corresponding path program 8 times [2022-04-06 14:21:18,312 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-04-06 14:21:18,312 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1075420796] [2022-04-06 14:21:18,312 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-04-06 14:21:18,312 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-04-06 14:21:18,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 14:21:19,704 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-04-06 14:21:19,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 14:21:19,707 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2022-04-06 14:21:19,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 14:21:19,711 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 39 [2022-04-06 14:21:19,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 14:21:19,719 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 47 [2022-04-06 14:21:19,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-04-06 14:21:19,725 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 6 proven. 68 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-04-06 14:21:19,726 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-04-06 14:21:19,726 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1075420796] [2022-04-06 14:21:19,726 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1075420796] provided 0 perfect and 1 imperfect interpolant sequences [2022-04-06 14:21:19,726 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1001666945] [2022-04-06 14:21:19,726 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-04-06 14:21:19,726 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-04-06 14:21:19,726 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-04-06 14:21:19,727 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-04-06 14:21:19,742 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-04-06 14:21:19,812 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-04-06 14:21:19,813 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-04-06 14:21:19,814 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 64 conjunts are in the unsatisfiable core [2022-04-06 14:21:19,816 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-04-06 14:21:19,827 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-04-06 14:21:19,995 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 19 [2022-04-06 14:21:20,132 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-04-06 14:21:20,134 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2022-04-06 14:21:20,257 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-04-06 14:21:20,258 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 32 [2022-04-06 14:21:20,371 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-04-06 14:21:20,372 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 32 [2022-04-06 14:21:27,056 WARN L855 $PredicateComparison]: unable to prove that (exists ((|v_main_~#str2~0.base_BEFORE_CALL_10| Int) (|v_main_~#str1~0.base_BEFORE_CALL_10| Int)) (and (not (= |v_main_~#str1~0.base_BEFORE_CALL_10| |v_main_~#str2~0.base_BEFORE_CALL_10|)) (= (select (select |c_#memory_int| |v_main_~#str1~0.base_BEFORE_CALL_10|) 3) (select (select |c_#memory_int| |v_main_~#str2~0.base_BEFORE_CALL_10|) 1)))) is different from true [2022-04-06 14:21:27,615 WARN L855 $PredicateComparison]: unable to prove that (exists ((|v_main_~#str1~0.base_BEFORE_CALL_11| Int) (|v_main_~#str2~0.base_BEFORE_CALL_11| Int)) (and (not (= |v_main_~#str1~0.base_BEFORE_CALL_11| |v_main_~#str2~0.base_BEFORE_CALL_11|)) (= (select (select |c_#memory_int| |v_main_~#str2~0.base_BEFORE_CALL_11|) 1) (select (select |c_#memory_int| |v_main_~#str1~0.base_BEFORE_CALL_11|) 3)))) is different from true [2022-04-06 14:21:27,768 INFO L173 IndexEqualityManager]: detected equality via solver [2022-04-06 14:21:27,769 INFO L173 IndexEqualityManager]: detected equality via solver [2022-04-06 14:21:27,770 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 10 [2022-04-06 14:21:27,817 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 25 trivial. 16 not checked. [2022-04-06 14:21:27,817 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-04-06 14:21:31,256 INFO L356 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-04-06 14:21:31,256 INFO L390 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 4562 treesize of output 4298