/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationQvasr_64.epf -i ../../../trunk/examples/svcomp/loops-crafted-1/Mono1_1-2.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-5d317bd [2022-03-19 08:11:55,252 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-03-19 08:11:55,281 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-03-19 08:11:55,310 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-03-19 08:11:55,310 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-03-19 08:11:55,311 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-03-19 08:11:55,313 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-03-19 08:11:55,318 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-03-19 08:11:55,319 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-03-19 08:11:55,323 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-03-19 08:11:55,323 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-03-19 08:11:55,325 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-03-19 08:11:55,325 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-03-19 08:11:55,326 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-03-19 08:11:55,327 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-03-19 08:11:55,329 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-03-19 08:11:55,330 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-03-19 08:11:55,331 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-03-19 08:11:55,332 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-03-19 08:11:55,336 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-03-19 08:11:55,338 INFO L181 SettingsManager]: Resetting HornVerifier preferences to default values [2022-03-19 08:11:55,339 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-03-19 08:11:55,339 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-03-19 08:11:55,340 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-03-19 08:11:55,341 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-03-19 08:11:55,346 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-03-19 08:11:55,346 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-03-19 08:11:55,346 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-03-19 08:11:55,347 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-03-19 08:11:55,347 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-03-19 08:11:55,348 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-03-19 08:11:55,349 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-03-19 08:11:55,350 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-03-19 08:11:55,350 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-03-19 08:11:55,351 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-03-19 08:11:55,351 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-03-19 08:11:55,351 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-03-19 08:11:55,352 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-03-19 08:11:55,352 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-03-19 08:11:55,352 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-03-19 08:11:55,353 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-03-19 08:11:55,354 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-03-19 08:11:55,355 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationQvasr_64.epf [2022-03-19 08:11:55,362 INFO L113 SettingsManager]: Loading preferences was successful [2022-03-19 08:11:55,362 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-03-19 08:11:55,363 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-03-19 08:11:55,363 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-03-19 08:11:55,363 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-03-19 08:11:55,363 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-03-19 08:11:55,363 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-03-19 08:11:55,364 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-03-19 08:11:55,364 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-03-19 08:11:55,364 INFO L138 SettingsManager]: * Use constant arrays=true [2022-03-19 08:11:55,364 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-03-19 08:11:55,365 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-03-19 08:11:55,365 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-03-19 08:11:55,365 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-03-19 08:11:55,365 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-03-19 08:11:55,365 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-19 08:11:55,365 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-03-19 08:11:55,365 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=Craig_NestedInterpolation [2022-03-19 08:11:55,365 INFO L138 SettingsManager]: * Trace refinement strategy=ACCELERATED_INTERPOLATION [2022-03-19 08:11:55,366 INFO L138 SettingsManager]: * Trace refinement strategy used in Accelerated Interpolation=CAMEL [2022-03-19 08:11:55,366 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-03-19 08:11:55,366 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=QVASR [2022-03-19 08:11:55,366 INFO L138 SettingsManager]: * Use separate solver for trace checks=false WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-03-19 08:11:55,571 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-03-19 08:11:55,589 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-03-19 08:11:55,591 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-03-19 08:11:55,592 INFO L271 PluginConnector]: Initializing CDTParser... [2022-03-19 08:11:55,593 INFO L275 PluginConnector]: CDTParser initialized [2022-03-19 08:11:55,593 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/Mono1_1-2.c [2022-03-19 08:11:55,636 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8205e0318/ced5ab501ef94dd18482bfe4acd04c9d/FLAG8ae8fe446 [2022-03-19 08:11:55,947 INFO L306 CDTParser]: Found 1 translation units. [2022-03-19 08:11:55,947 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/Mono1_1-2.c [2022-03-19 08:11:55,954 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8205e0318/ced5ab501ef94dd18482bfe4acd04c9d/FLAG8ae8fe446 [2022-03-19 08:11:56,373 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8205e0318/ced5ab501ef94dd18482bfe4acd04c9d [2022-03-19 08:11:56,375 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-03-19 08:11:56,376 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-03-19 08:11:56,377 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-03-19 08:11:56,377 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-03-19 08:11:56,379 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-03-19 08:11:56,379 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.03 08:11:56" (1/1) ... [2022-03-19 08:11:56,380 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1d8d079c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 08:11:56, skipping insertion in model container [2022-03-19 08:11:56,380 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.03 08:11:56" (1/1) ... [2022-03-19 08:11:56,387 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-03-19 08:11:56,397 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-03-19 08:11:56,509 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-crafted-1/Mono1_1-2.c[313,326] [2022-03-19 08:11:56,524 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-19 08:11:56,532 INFO L203 MainTranslator]: Completed pre-run [2022-03-19 08:11:56,541 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-crafted-1/Mono1_1-2.c[313,326] [2022-03-19 08:11:56,543 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-03-19 08:11:56,551 INFO L208 MainTranslator]: Completed translation [2022-03-19 08:11:56,552 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 08:11:56 WrapperNode [2022-03-19 08:11:56,552 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-03-19 08:11:56,554 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-03-19 08:11:56,554 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-03-19 08:11:56,554 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-03-19 08:11:56,562 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 08:11:56" (1/1) ... [2022-03-19 08:11:56,562 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 08:11:56" (1/1) ... [2022-03-19 08:11:56,568 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 08:11:56" (1/1) ... [2022-03-19 08:11:56,568 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 08:11:56" (1/1) ... [2022-03-19 08:11:56,572 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 08:11:56" (1/1) ... [2022-03-19 08:11:56,575 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 08:11:56" (1/1) ... [2022-03-19 08:11:56,583 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 08:11:56" (1/1) ... [2022-03-19 08:11:56,585 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-03-19 08:11:56,585 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-03-19 08:11:56,585 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-03-19 08:11:56,585 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-03-19 08:11:56,586 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 08:11:56" (1/1) ... [2022-03-19 08:11:56,592 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-03-19 08:11:56,599 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:11:56,614 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-03-19 08:11:56,643 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-03-19 08:11:56,673 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-03-19 08:11:56,673 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-03-19 08:11:56,673 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-03-19 08:11:56,674 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-03-19 08:11:56,674 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-03-19 08:11:56,674 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-03-19 08:11:56,674 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-03-19 08:11:56,674 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-03-19 08:11:56,674 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-03-19 08:11:56,674 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-03-19 08:11:56,674 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-03-19 08:11:56,674 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-03-19 08:11:56,675 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-03-19 08:11:56,675 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-03-19 08:11:56,675 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-03-19 08:11:56,676 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-03-19 08:11:56,676 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-03-19 08:11:56,723 INFO L234 CfgBuilder]: Building ICFG [2022-03-19 08:11:56,724 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-03-19 08:11:56,803 INFO L275 CfgBuilder]: Performing block encoding [2022-03-19 08:11:56,807 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-03-19 08:11:56,807 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2022-03-19 08:11:56,808 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.03 08:11:56 BoogieIcfgContainer [2022-03-19 08:11:56,808 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-03-19 08:11:56,814 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-03-19 08:11:56,814 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-03-19 08:11:56,816 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-03-19 08:11:56,816 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.03 08:11:56" (1/3) ... [2022-03-19 08:11:56,817 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@53631d6a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.03 08:11:56, skipping insertion in model container [2022-03-19 08:11:56,817 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.03 08:11:56" (2/3) ... [2022-03-19 08:11:56,817 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@53631d6a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.03 08:11:56, skipping insertion in model container [2022-03-19 08:11:56,818 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.03 08:11:56" (3/3) ... [2022-03-19 08:11:56,819 INFO L111 eAbstractionObserver]: Analyzing ICFG Mono1_1-2.c [2022-03-19 08:11:56,823 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-03-19 08:11:56,823 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-03-19 08:11:56,851 INFO L339 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-03-19 08:11:56,856 INFO L340 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=Craig_NestedInterpolation, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP [2022-03-19 08:11:56,856 INFO L341 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-03-19 08:11:56,868 INFO L276 IsEmpty]: Start isEmpty. Operand has 19 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 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) [2022-03-19 08:11:56,884 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-03-19 08:11:56,884 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:11:56,884 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:11:56,885 INFO L403 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:11:56,888 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:11:56,888 INFO L85 PathProgramCache]: Analyzing trace with hash 491760044, now seen corresponding path program 1 times [2022-03-19 08:11:56,894 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:11:56,894 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [818128797] [2022-03-19 08:11:56,901 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-19 08:11:56,901 INFO L85 PathProgramCache]: Analyzing trace with hash 491760044, now seen corresponding path program 2 times [2022-03-19 08:11:56,903 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:11:56,903 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [737827067] [2022-03-19 08:11:56,903 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:11:56,904 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:11:56,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:11:57,022 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:11:57,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:11:57,030 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:11:57,031 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:11:57,031 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [737827067] [2022-03-19 08:11:57,031 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [737827067] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:11:57,032 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:11:57,032 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-19 08:11:57,033 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:11:57,034 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [818128797] [2022-03-19 08:11:57,034 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [818128797] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:11:57,034 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:11:57,034 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-03-19 08:11:57,034 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [379969786] [2022-03-19 08:11:57,048 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:11:57,051 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-03-19 08:11:57,051 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:11:57,074 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-03-19 08:11:57,075 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-03-19 08:11:57,076 INFO L87 Difference]: Start difference. First operand has 19 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 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 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 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) [2022-03-19 08:11:57,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:11:57,134 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2022-03-19 08:11:57,148 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-03-19 08:11:57,149 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 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 11 [2022-03-19 08:11:57,149 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:11:57,153 INFO L225 Difference]: With dead ends: 30 [2022-03-19 08:11:57,153 INFO L226 Difference]: Without dead ends: 13 [2022-03-19 08:11:57,157 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-03-19 08:11:57,159 INFO L912 BasicCegarLoop]: 19 mSDtfsCounter, 11 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 5 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-19 08:11:57,160 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 22 Invalid, 5 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-19 08:11:57,170 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2022-03-19 08:11:57,184 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2022-03-19 08:11:57,185 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 8 states have (on average 1.25) internal successors, (10), 8 states have internal predecessors, (10), 3 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) [2022-03-19 08:11:57,186 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2022-03-19 08:11:57,187 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 11 [2022-03-19 08:11:57,188 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:11:57,188 INFO L478 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2022-03-19 08:11:57,188 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 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) [2022-03-19 08:11:57,189 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2022-03-19 08:11:57,189 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-03-19 08:11:57,189 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:11:57,190 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:11:57,190 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-03-19 08:11:57,190 INFO L403 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:11:57,191 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:11:57,191 INFO L85 PathProgramCache]: Analyzing trace with hash 482524834, now seen corresponding path program 1 times [2022-03-19 08:11:57,191 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:11:57,192 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [112492092] [2022-03-19 08:11:57,194 INFO L202 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-03-19 08:11:57,194 INFO L85 PathProgramCache]: Analyzing trace with hash 482524834, now seen corresponding path program 2 times [2022-03-19 08:11:57,195 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:11:57,195 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [821546039] [2022-03-19 08:11:57,195 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:11:57,196 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:11:57,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:11:57,305 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:11:57,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:11:57,315 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:11:57,316 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:11:57,316 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [821546039] [2022-03-19 08:11:57,316 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [821546039] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:11:57,316 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:11:57,316 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-19 08:11:57,317 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:11:57,317 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [112492092] [2022-03-19 08:11:57,317 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [112492092] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:11:57,317 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:11:57,317 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-03-19 08:11:57,317 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [62566883] [2022-03-19 08:11:57,317 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:11:57,318 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-03-19 08:11:57,318 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:11:57,319 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-03-19 08:11:57,319 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-03-19 08:11:57,319 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 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) [2022-03-19 08:11:57,350 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:11:57,350 INFO L93 Difference]: Finished difference Result 22 states and 26 transitions. [2022-03-19 08:11:57,351 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-03-19 08:11:57,351 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 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 11 [2022-03-19 08:11:57,351 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:11:57,352 INFO L225 Difference]: With dead ends: 22 [2022-03-19 08:11:57,352 INFO L226 Difference]: Without dead ends: 15 [2022-03-19 08:11:57,352 INFO L911 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 [2022-03-19 08:11:57,355 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 10 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-19 08:11:57,355 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 19 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-19 08:11:57,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2022-03-19 08:11:57,364 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2022-03-19 08:11:57,366 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 10 states have (on average 1.2) internal successors, (12), 10 states have internal predecessors, (12), 3 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) [2022-03-19 08:11:57,367 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2022-03-19 08:11:57,372 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 11 [2022-03-19 08:11:57,372 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:11:57,372 INFO L478 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2022-03-19 08:11:57,373 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 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) [2022-03-19 08:11:57,373 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2022-03-19 08:11:57,373 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-03-19 08:11:57,373 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:11:57,373 INFO L500 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:11:57,373 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-03-19 08:11:57,373 INFO L403 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:11:57,374 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:11:57,374 INFO L85 PathProgramCache]: Analyzing trace with hash 925229631, now seen corresponding path program 1 times [2022-03-19 08:11:57,374 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:11:57,391 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [794446959] [2022-03-19 08:11:57,476 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-03-19 08:11:57,477 INFO L85 PathProgramCache]: Analyzing trace with hash -1303175503, now seen corresponding path program 1 times [2022-03-19 08:11:57,477 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:11:57,477 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [196540349] [2022-03-19 08:11:57,477 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:11:57,478 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:11:57,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:11:57,585 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:11:57,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:11:57,604 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:11:57,604 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:11:57,604 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [196540349] [2022-03-19 08:11:57,605 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [196540349] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:11:57,605 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:11:57,605 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-19 08:11:57,707 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:11:57,707 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [794446959] [2022-03-19 08:11:57,707 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [794446959] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:11:57,707 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:11:57,707 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-19 08:11:57,707 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [123897652] [2022-03-19 08:11:57,708 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:11:57,708 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-19 08:11:57,708 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:11:57,709 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-19 08:11:57,709 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2022-03-19 08:11:57,709 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 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) [2022-03-19 08:11:57,804 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:11:57,805 INFO L93 Difference]: Finished difference Result 22 states and 24 transitions. [2022-03-19 08:11:57,805 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-19 08:11:57,805 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 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 13 [2022-03-19 08:11:57,805 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:11:57,805 INFO L225 Difference]: With dead ends: 22 [2022-03-19 08:11:57,806 INFO L226 Difference]: Without dead ends: 17 [2022-03-19 08:11:57,806 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 7 SyntacticMatches, 2 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=47, Unknown=0, NotChecked=0, Total=72 [2022-03-19 08:11:57,809 INFO L912 BasicCegarLoop]: 11 mSDtfsCounter, 11 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 30 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-19 08:11:57,814 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 23 Invalid, 30 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-19 08:11:57,815 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2022-03-19 08:11:57,820 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2022-03-19 08:11:57,821 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 12 states have (on average 1.25) internal successors, (15), 12 states have internal predecessors, (15), 3 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) [2022-03-19 08:11:57,822 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2022-03-19 08:11:57,823 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 13 [2022-03-19 08:11:57,823 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:11:57,823 INFO L478 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2022-03-19 08:11:57,823 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 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) [2022-03-19 08:11:57,824 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2022-03-19 08:11:57,824 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-03-19 08:11:57,824 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:11:57,825 INFO L500 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:11:57,825 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-03-19 08:11:57,826 INFO L403 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:11:57,827 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:11:57,827 INFO L85 PathProgramCache]: Analyzing trace with hash 1220035546, now seen corresponding path program 1 times [2022-03-19 08:11:57,827 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:11:57,831 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1758844525] [2022-03-19 08:11:58,082 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-19 08:11:58,082 INFO L85 PathProgramCache]: Analyzing trace with hash -1244070159, now seen corresponding path program 1 times [2022-03-19 08:11:58,083 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:11:58,083 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1990656890] [2022-03-19 08:11:58,083 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:11:58,083 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:11:58,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:11:58,099 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 08:11:58,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:11:58,122 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 08:11:58,122 INFO L85 PathProgramCache]: Analyzing trace with hash 1220035546, now seen corresponding path program 2 times [2022-03-19 08:11:58,123 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:11:58,123 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [327541760] [2022-03-19 08:11:58,123 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:11:58,123 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:11:58,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:11:58,174 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:11:58,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:11:58,186 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:11:58,186 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:11:58,187 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [327541760] [2022-03-19 08:11:58,187 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [327541760] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:11:58,187 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1257790449] [2022-03-19 08:11:58,187 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-19 08:11:58,187 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:11:58,187 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:11:58,189 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:11:58,191 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-03-19 08:11:58,222 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-19 08:11:58,222 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 08:11:58,223 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 6 conjunts are in the unsatisfiable core [2022-03-19 08:11:58,225 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:11:58,268 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:11:58,268 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:11:58,346 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:11:58,346 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1257790449] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:11:58,347 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:11:58,347 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 5] total 9 [2022-03-19 08:11:58,347 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:11:58,347 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1758844525] [2022-03-19 08:11:58,347 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1758844525] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:11:58,347 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:11:58,348 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-03-19 08:11:58,348 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1726372067] [2022-03-19 08:11:58,348 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:11:58,348 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-03-19 08:11:58,348 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:11:58,348 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-03-19 08:11:58,349 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2022-03-19 08:11:58,349 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. 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) [2022-03-19 08:11:58,380 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:11:58,380 INFO L93 Difference]: Finished difference Result 26 states and 30 transitions. [2022-03-19 08:11:58,380 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-03-19 08:11:58,381 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 [2022-03-19 08:11:58,381 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:11:58,381 INFO L225 Difference]: With dead ends: 26 [2022-03-19 08:11:58,381 INFO L226 Difference]: Without dead ends: 19 [2022-03-19 08:11:58,381 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 27 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=43, Invalid=67, Unknown=0, NotChecked=0, Total=110 [2022-03-19 08:11:58,382 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 10 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-19 08:11:58,382 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 24 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-19 08:11:58,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2022-03-19 08:11:58,386 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2022-03-19 08:11:58,386 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 14 states have internal predecessors, (17), 3 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) [2022-03-19 08:11:58,386 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2022-03-19 08:11:58,386 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 15 [2022-03-19 08:11:58,387 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:11:58,387 INFO L478 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2022-03-19 08:11:58,387 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) [2022-03-19 08:11:58,387 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2022-03-19 08:11:58,387 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-03-19 08:11:58,387 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:11:58,387 INFO L500 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:11:58,407 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-03-19 08:11:58,588 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,SelfDestructingSolverStorable3,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:11:58,588 INFO L403 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:11:58,589 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:11:58,589 INFO L85 PathProgramCache]: Analyzing trace with hash 1870024951, now seen corresponding path program 3 times [2022-03-19 08:11:58,589 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:11:58,589 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1023660934] [2022-03-19 08:11:58,823 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-19 08:11:58,823 INFO L85 PathProgramCache]: Analyzing trace with hash -1184964815, now seen corresponding path program 1 times [2022-03-19 08:11:58,823 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:11:58,824 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1001192053] [2022-03-19 08:11:58,824 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:11:58,824 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:11:58,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:11:58,854 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 08:11:58,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:11:58,890 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 08:11:58,890 INFO L85 PathProgramCache]: Analyzing trace with hash 1870024951, now seen corresponding path program 4 times [2022-03-19 08:11:58,890 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:11:58,891 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [335377406] [2022-03-19 08:11:58,891 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:11:58,891 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:11:58,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:11:58,959 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:11:58,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:11:58,963 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:11:58,963 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:11:58,963 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [335377406] [2022-03-19 08:11:58,964 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [335377406] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:11:58,964 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [245701119] [2022-03-19 08:11:58,964 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-19 08:11:58,964 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:11:58,964 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:11:58,967 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:11:58,969 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-03-19 08:11:58,998 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-19 08:11:58,998 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 08:11:58,999 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 8 conjunts are in the unsatisfiable core [2022-03-19 08:11:59,000 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:11:59,070 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:11:59,070 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:11:59,168 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:11:59,168 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [245701119] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:11:59,168 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:11:59,168 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 6] total 11 [2022-03-19 08:11:59,168 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:11:59,169 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1023660934] [2022-03-19 08:11:59,169 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1023660934] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:11:59,169 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:11:59,169 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-03-19 08:11:59,170 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [945347511] [2022-03-19 08:11:59,170 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:11:59,170 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-03-19 08:11:59,170 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:11:59,171 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-03-19 08:11:59,171 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=71, Unknown=0, NotChecked=0, Total=110 [2022-03-19 08:11:59,171 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 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) [2022-03-19 08:11:59,224 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:11:59,225 INFO L93 Difference]: Finished difference Result 28 states and 32 transitions. [2022-03-19 08:11:59,225 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-03-19 08:11:59,225 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 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 [2022-03-19 08:11:59,226 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:11:59,226 INFO L225 Difference]: With dead ends: 28 [2022-03-19 08:11:59,226 INFO L226 Difference]: Without dead ends: 21 [2022-03-19 08:11:59,226 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 30 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=67, Invalid=115, Unknown=0, NotChecked=0, Total=182 [2022-03-19 08:11:59,227 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 11 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-19 08:11:59,227 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 29 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-19 08:11:59,228 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2022-03-19 08:11:59,234 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2022-03-19 08:11:59,234 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 16 states have (on average 1.1875) internal successors, (19), 16 states have internal predecessors, (19), 3 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) [2022-03-19 08:11:59,235 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2022-03-19 08:11:59,236 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 17 [2022-03-19 08:11:59,236 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:11:59,236 INFO L478 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2022-03-19 08:11:59,236 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 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) [2022-03-19 08:11:59,236 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2022-03-19 08:11:59,237 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-03-19 08:11:59,237 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:11:59,237 INFO L500 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:11:59,256 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-03-19 08:11:59,447 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,SelfDestructingSolverStorable6,SelfDestructingSolverStorable5 [2022-03-19 08:11:59,448 INFO L403 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:11:59,448 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:11:59,448 INFO L85 PathProgramCache]: Analyzing trace with hash -555382060, now seen corresponding path program 5 times [2022-03-19 08:11:59,448 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:11:59,448 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [371343158] [2022-03-19 08:11:59,617 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-19 08:11:59,618 INFO L85 PathProgramCache]: Analyzing trace with hash -1125859471, now seen corresponding path program 1 times [2022-03-19 08:11:59,618 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:11:59,618 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1364126007] [2022-03-19 08:11:59,618 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:11:59,618 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:11:59,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:11:59,638 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 08:11:59,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:11:59,646 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 08:11:59,646 INFO L85 PathProgramCache]: Analyzing trace with hash -555382060, now seen corresponding path program 6 times [2022-03-19 08:11:59,646 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:11:59,646 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [686887924] [2022-03-19 08:11:59,647 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:11:59,647 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:11:59,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:11:59,709 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:11:59,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:11:59,720 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:11:59,720 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:11:59,720 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [686887924] [2022-03-19 08:11:59,720 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [686887924] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:11:59,720 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [786094297] [2022-03-19 08:11:59,721 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-19 08:11:59,721 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:11:59,722 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:11:59,726 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) [2022-03-19 08:11:59,727 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-03-19 08:11:59,769 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2022-03-19 08:11:59,769 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 08:11:59,770 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 12 conjunts are in the unsatisfiable core [2022-03-19 08:11:59,771 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:11:59,860 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 12 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-03-19 08:11:59,860 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:11:59,958 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 9 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-03-19 08:11:59,958 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [786094297] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:11:59,959 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:11:59,959 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 5, 7] total 15 [2022-03-19 08:11:59,959 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:11:59,959 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [371343158] [2022-03-19 08:11:59,959 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [371343158] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:11:59,959 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:11:59,959 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-03-19 08:11:59,959 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1597479206] [2022-03-19 08:11:59,959 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:11:59,961 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-03-19 08:11:59,961 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:11:59,961 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-03-19 08:11:59,961 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2022-03-19 08:11:59,961 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 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) [2022-03-19 08:12:00,035 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:12:00,036 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2022-03-19 08:12:00,036 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-03-19 08:12:00,036 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 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 [2022-03-19 08:12:00,036 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:12:00,037 INFO L225 Difference]: With dead ends: 30 [2022-03-19 08:12:00,037 INFO L226 Difference]: Without dead ends: 23 [2022-03-19 08:12:00,037 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 32 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=82, Invalid=260, Unknown=0, NotChecked=0, Total=342 [2022-03-19 08:12:00,037 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 12 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-19 08:12:00,038 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 29 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-19 08:12:00,038 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2022-03-19 08:12:00,041 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2022-03-19 08:12:00,041 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 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), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:12:00,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2022-03-19 08:12:00,042 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 19 [2022-03-19 08:12:00,042 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:12:00,042 INFO L478 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2022-03-19 08:12:00,042 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 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) [2022-03-19 08:12:00,042 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2022-03-19 08:12:00,042 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-03-19 08:12:00,043 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:12:00,043 INFO L500 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:12:00,055 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-03-19 08:12:00,251 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,SelfDestructingSolverStorable7,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:12:00,251 INFO L403 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:12:00,252 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:12:00,252 INFO L85 PathProgramCache]: Analyzing trace with hash 795722097, now seen corresponding path program 7 times [2022-03-19 08:12:00,252 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:12:00,252 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [202026945] [2022-03-19 08:12:00,421 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-19 08:12:00,422 INFO L85 PathProgramCache]: Analyzing trace with hash -1066754127, now seen corresponding path program 1 times [2022-03-19 08:12:00,422 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:12:00,422 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1909333641] [2022-03-19 08:12:00,422 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:12:00,422 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:12:00,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:12:00,430 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 08:12:00,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:12:00,437 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 08:12:00,437 INFO L85 PathProgramCache]: Analyzing trace with hash 795722097, now seen corresponding path program 8 times [2022-03-19 08:12:00,438 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:12:00,438 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2112162688] [2022-03-19 08:12:00,438 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:12:00,438 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:12:00,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:12:00,506 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:12:00,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:12:00,521 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 5 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:12:00,521 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:12:00,521 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2112162688] [2022-03-19 08:12:00,521 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2112162688] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:12:00,521 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [63891204] [2022-03-19 08:12:00,521 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-19 08:12:00,521 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:12:00,522 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:12:00,523 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) [2022-03-19 08:12:00,524 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-03-19 08:12:00,553 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-19 08:12:00,553 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 08:12:00,554 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 16 conjunts are in the unsatisfiable core [2022-03-19 08:12:00,555 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:12:00,640 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:12:00,640 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:12:00,844 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:12:00,845 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [63891204] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:12:00,845 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:12:00,845 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 11] total 19 [2022-03-19 08:12:00,845 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:12:00,845 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [202026945] [2022-03-19 08:12:00,845 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [202026945] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:12:00,845 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:12:00,845 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-03-19 08:12:00,845 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1428378891] [2022-03-19 08:12:00,845 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:12:00,845 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-03-19 08:12:00,846 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:12:00,846 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-03-19 08:12:00,846 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=259, Unknown=0, NotChecked=0, Total=342 [2022-03-19 08:12:00,846 INFO L87 Difference]: Start difference. First operand 23 states and 25 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) [2022-03-19 08:12:00,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:12:00,941 INFO L93 Difference]: Finished difference Result 32 states and 36 transitions. [2022-03-19 08:12:00,942 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-03-19 08:12:00,942 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 21 [2022-03-19 08:12:00,942 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:12:00,942 INFO L225 Difference]: With dead ends: 32 [2022-03-19 08:12:00,942 INFO L226 Difference]: Without dead ends: 25 [2022-03-19 08:12:00,943 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 32 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=141, Invalid=411, Unknown=0, NotChecked=0, Total=552 [2022-03-19 08:12:00,943 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 13 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 56 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-03-19 08:12:00,943 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 19 Invalid, 56 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 45 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-03-19 08:12:00,944 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2022-03-19 08:12:00,947 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2022-03-19 08:12:00,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 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), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:12:00,948 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2022-03-19 08:12:00,948 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 21 [2022-03-19 08:12:00,948 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:12:00,948 INFO L478 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2022-03-19 08:12:00,948 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) [2022-03-19 08:12:00,948 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2022-03-19 08:12:00,948 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-03-19 08:12:00,949 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:12:00,949 INFO L500 BasicCegarLoop]: trace histogram [6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:12:00,973 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-03-19 08:12:01,149 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,SelfDestructingSolverStorable9,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:12:01,149 INFO L403 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:12:01,150 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:12:01,150 INFO L85 PathProgramCache]: Analyzing trace with hash 2126693582, now seen corresponding path program 9 times [2022-03-19 08:12:01,150 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:12:01,150 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1527794710] [2022-03-19 08:12:01,285 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-19 08:12:01,286 INFO L85 PathProgramCache]: Analyzing trace with hash -1007648783, now seen corresponding path program 1 times [2022-03-19 08:12:01,286 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:12:01,286 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2122863143] [2022-03-19 08:12:01,286 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:12:01,286 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:12:01,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:12:01,304 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 08:12:01,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:12:01,319 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 08:12:01,319 INFO L85 PathProgramCache]: Analyzing trace with hash 2126693582, now seen corresponding path program 10 times [2022-03-19 08:12:01,319 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:12:01,319 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1944106255] [2022-03-19 08:12:01,319 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:12:01,319 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:12:01,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:12:01,400 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:12:01,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:12:01,403 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 6 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:12:01,404 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:12:01,404 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1944106255] [2022-03-19 08:12:01,404 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1944106255] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:12:01,404 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [26431842] [2022-03-19 08:12:01,404 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-19 08:12:01,404 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:12:01,404 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:12:01,405 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) [2022-03-19 08:12:01,406 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-03-19 08:12:01,430 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-19 08:12:01,431 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 08:12:01,431 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 14 conjunts are in the unsatisfiable core [2022-03-19 08:12:01,432 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:12:01,506 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 6 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:12:01,506 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:12:01,691 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 6 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:12:01,692 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [26431842] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:12:01,692 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:12:01,692 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 9] total 17 [2022-03-19 08:12:01,692 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:12:01,692 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1527794710] [2022-03-19 08:12:01,692 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1527794710] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:12:01,692 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:12:01,692 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-03-19 08:12:01,692 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1858902618] [2022-03-19 08:12:01,693 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:12:01,693 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-03-19 08:12:01,693 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:12:01,693 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-03-19 08:12:01,693 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=185, Unknown=0, NotChecked=0, Total=272 [2022-03-19 08:12:01,693 INFO L87 Difference]: Start difference. First operand 25 states and 27 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) [2022-03-19 08:12:01,795 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:12:01,796 INFO L93 Difference]: Finished difference Result 34 states and 38 transitions. [2022-03-19 08:12:01,796 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-03-19 08:12:01,796 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 23 [2022-03-19 08:12:01,796 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:12:01,797 INFO L225 Difference]: With dead ends: 34 [2022-03-19 08:12:01,797 INFO L226 Difference]: Without dead ends: 27 [2022-03-19 08:12:01,797 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 39 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=163, Invalid=343, Unknown=0, NotChecked=0, Total=506 [2022-03-19 08:12:01,797 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 14 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 76 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 89 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 76 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-19 08:12:01,798 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 29 Invalid, 89 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 76 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-19 08:12:01,798 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2022-03-19 08:12:01,801 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2022-03-19 08:12:01,802 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 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), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:12:01,802 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 29 transitions. [2022-03-19 08:12:01,802 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 29 transitions. Word has length 23 [2022-03-19 08:12:01,802 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:12:01,802 INFO L478 AbstractCegarLoop]: Abstraction has 27 states and 29 transitions. [2022-03-19 08:12:01,802 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) [2022-03-19 08:12:01,803 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 29 transitions. [2022-03-19 08:12:01,803 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-03-19 08:12:01,803 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:12:01,803 INFO L500 BasicCegarLoop]: trace histogram [7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:12:01,823 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-03-19 08:12:02,011 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11,SelfDestructingSolverStorable12 [2022-03-19 08:12:02,012 INFO L403 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:12:02,012 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:12:02,012 INFO L85 PathProgramCache]: Analyzing trace with hash 1290036459, now seen corresponding path program 11 times [2022-03-19 08:12:02,012 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:12:02,012 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [222681408] [2022-03-19 08:12:02,149 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-19 08:12:02,150 INFO L85 PathProgramCache]: Analyzing trace with hash -948543439, now seen corresponding path program 1 times [2022-03-19 08:12:02,150 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:12:02,150 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1676867075] [2022-03-19 08:12:02,150 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:12:02,150 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:12:02,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:12:02,157 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 08:12:02,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:12:02,162 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 08:12:02,162 INFO L85 PathProgramCache]: Analyzing trace with hash 1290036459, now seen corresponding path program 12 times [2022-03-19 08:12:02,163 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:12:02,163 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1832047529] [2022-03-19 08:12:02,163 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:12:02,163 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:12:02,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:12:02,249 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:12:02,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:12:02,253 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 7 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:12:02,253 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:12:02,253 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1832047529] [2022-03-19 08:12:02,253 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1832047529] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:12:02,253 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [276591852] [2022-03-19 08:12:02,254 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-19 08:12:02,254 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:12:02,254 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:12:02,255 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) [2022-03-19 08:12:02,261 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-03-19 08:12:02,308 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-03-19 08:12:02,308 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 08:12:02,309 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 14 conjunts are in the unsatisfiable core [2022-03-19 08:12:02,310 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:12:02,427 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 30 proven. 7 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-03-19 08:12:02,428 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:12:02,564 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 25 proven. 4 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-03-19 08:12:02,565 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [276591852] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:12:02,565 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:12:02,565 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 6, 8] total 20 [2022-03-19 08:12:02,565 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:12:02,565 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [222681408] [2022-03-19 08:12:02,565 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [222681408] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:12:02,565 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:12:02,565 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2022-03-19 08:12:02,565 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [918724416] [2022-03-19 08:12:02,565 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:12:02,566 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-03-19 08:12:02,566 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:12:02,566 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-03-19 08:12:02,566 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=289, Unknown=0, NotChecked=0, Total=380 [2022-03-19 08:12:02,566 INFO L87 Difference]: Start difference. First operand 27 states and 29 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) [2022-03-19 08:12:02,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:12:02,695 INFO L93 Difference]: Finished difference Result 36 states and 40 transitions. [2022-03-19 08:12:02,695 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-03-19 08:12:02,695 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 25 [2022-03-19 08:12:02,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:12:02,696 INFO L225 Difference]: With dead ends: 36 [2022-03-19 08:12:02,696 INFO L226 Difference]: Without dead ends: 29 [2022-03-19 08:12:02,696 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 62 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=165, Invalid=537, Unknown=0, NotChecked=0, Total=702 [2022-03-19 08:12:02,696 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 15 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 111 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 126 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 111 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-19 08:12:02,697 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 39 Invalid, 126 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 111 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-19 08:12:02,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2022-03-19 08:12:02,700 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2022-03-19 08:12:02,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 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), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:12:02,701 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2022-03-19 08:12:02,701 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 25 [2022-03-19 08:12:02,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:12:02,701 INFO L478 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2022-03-19 08:12:02,701 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) [2022-03-19 08:12:02,701 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2022-03-19 08:12:02,702 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-03-19 08:12:02,702 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:12:02,702 INFO L500 BasicCegarLoop]: trace histogram [8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:12:02,716 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-03-19 08:12:02,906 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-03-19 08:12:02,907 INFO L403 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:12:02,907 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:12:02,907 INFO L85 PathProgramCache]: Analyzing trace with hash 421425608, now seen corresponding path program 13 times [2022-03-19 08:12:02,907 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:12:02,907 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2096327031] [2022-03-19 08:12:03,058 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-19 08:12:03,058 INFO L85 PathProgramCache]: Analyzing trace with hash -889438095, now seen corresponding path program 1 times [2022-03-19 08:12:03,058 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:12:03,058 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1855040657] [2022-03-19 08:12:03,058 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:12:03,059 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:12:03,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:12:03,064 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 08:12:03,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:12:03,069 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 08:12:03,069 INFO L85 PathProgramCache]: Analyzing trace with hash 421425608, now seen corresponding path program 14 times [2022-03-19 08:12:03,069 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:12:03,069 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1210468603] [2022-03-19 08:12:03,069 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:12:03,069 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:12:03,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:12:03,155 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:12:03,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:12:03,158 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 8 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:12:03,159 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:12:03,159 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1210468603] [2022-03-19 08:12:03,159 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1210468603] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:12:03,159 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [980648136] [2022-03-19 08:12:03,159 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-19 08:12:03,159 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:12:03,159 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:12:03,160 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) [2022-03-19 08:12:03,175 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-03-19 08:12:03,192 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-19 08:12:03,192 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 08:12:03,193 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 22 conjunts are in the unsatisfiable core [2022-03-19 08:12:03,194 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:12:03,284 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:12:03,285 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:12:03,614 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:12:03,615 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [980648136] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:12:03,615 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:12:03,615 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 14] total 25 [2022-03-19 08:12:03,615 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:12:03,615 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2096327031] [2022-03-19 08:12:03,615 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2096327031] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:12:03,615 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:12:03,615 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-03-19 08:12:03,615 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1643926119] [2022-03-19 08:12:03,616 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:12:03,616 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-03-19 08:12:03,616 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:12:03,616 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-03-19 08:12:03,616 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=146, Invalid=454, Unknown=0, NotChecked=0, Total=600 [2022-03-19 08:12:03,616 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand has 11 states, 11 states have (on average 2.090909090909091) internal successors, (23), 10 states have internal predecessors, (23), 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) [2022-03-19 08:12:03,758 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:12:03,759 INFO L93 Difference]: Finished difference Result 38 states and 42 transitions. [2022-03-19 08:12:03,759 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-03-19 08:12:03,759 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.090909090909091) internal successors, (23), 10 states have internal predecessors, (23), 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 [2022-03-19 08:12:03,759 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:12:03,759 INFO L225 Difference]: With dead ends: 38 [2022-03-19 08:12:03,760 INFO L226 Difference]: Without dead ends: 31 [2022-03-19 08:12:03,760 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 41 SyntacticMatches, 2 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=264, Invalid=792, Unknown=0, NotChecked=0, Total=1056 [2022-03-19 08:12:03,760 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 16 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 120 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 137 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 120 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-19 08:12:03,761 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 24 Invalid, 137 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 120 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-19 08:12:03,761 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2022-03-19 08:12:03,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2022-03-19 08:12:03,765 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 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), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:12:03,765 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 33 transitions. [2022-03-19 08:12:03,765 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 33 transitions. Word has length 27 [2022-03-19 08:12:03,765 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:12:03,765 INFO L478 AbstractCegarLoop]: Abstraction has 31 states and 33 transitions. [2022-03-19 08:12:03,766 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.090909090909091) internal successors, (23), 10 states have internal predecessors, (23), 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) [2022-03-19 08:12:03,766 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 33 transitions. [2022-03-19 08:12:03,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-03-19 08:12:03,766 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:12:03,766 INFO L500 BasicCegarLoop]: trace histogram [9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:12:03,791 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-03-19 08:12:03,975 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,SelfDestructingSolverStorable16,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:12:03,975 INFO L403 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:12:03,976 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:12:03,976 INFO L85 PathProgramCache]: Analyzing trace with hash -1089946779, now seen corresponding path program 15 times [2022-03-19 08:12:03,976 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:12:03,976 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1062951352] [2022-03-19 08:12:04,117 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-19 08:12:04,117 INFO L85 PathProgramCache]: Analyzing trace with hash -830332751, now seen corresponding path program 1 times [2022-03-19 08:12:04,117 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:12:04,117 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1130054596] [2022-03-19 08:12:04,118 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:12:04,118 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:12:04,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:12:04,123 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 08:12:04,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:12:04,127 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 08:12:04,128 INFO L85 PathProgramCache]: Analyzing trace with hash -1089946779, now seen corresponding path program 16 times [2022-03-19 08:12:04,128 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:12:04,128 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [387979921] [2022-03-19 08:12:04,128 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:12:04,128 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:12:04,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:12:04,223 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:12:04,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:12:04,227 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 9 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:12:04,227 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:12:04,227 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [387979921] [2022-03-19 08:12:04,228 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [387979921] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:12:04,228 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1272886113] [2022-03-19 08:12:04,228 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-19 08:12:04,228 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:12:04,228 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:12:04,229 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) [2022-03-19 08:12:04,230 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-03-19 08:12:04,255 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-19 08:12:04,255 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 08:12:04,256 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 21 conjunts are in the unsatisfiable core [2022-03-19 08:12:04,256 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:12:04,366 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:12:04,366 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:12:04,609 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:12:04,609 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1272886113] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:12:04,609 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:12:04,609 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 24 [2022-03-19 08:12:04,610 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:12:04,610 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1062951352] [2022-03-19 08:12:04,610 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1062951352] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:12:04,610 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:12:04,610 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2022-03-19 08:12:04,610 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [666419645] [2022-03-19 08:12:04,610 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:12:04,610 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-03-19 08:12:04,610 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:12:04,610 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-03-19 08:12:04,611 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=164, Invalid=388, Unknown=0, NotChecked=0, Total=552 [2022-03-19 08:12:04,611 INFO L87 Difference]: Start difference. First operand 31 states and 33 transitions. Second operand has 12 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 11 states have internal predecessors, (25), 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) [2022-03-19 08:12:04,772 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:12:04,772 INFO L93 Difference]: Finished difference Result 40 states and 44 transitions. [2022-03-19 08:12:04,772 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-03-19 08:12:04,772 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 11 states have internal predecessors, (25), 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 [2022-03-19 08:12:04,773 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:12:04,773 INFO L225 Difference]: With dead ends: 40 [2022-03-19 08:12:04,773 INFO L226 Difference]: Without dead ends: 33 [2022-03-19 08:12:04,774 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 47 SyntacticMatches, 2 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 62 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=306, Invalid=750, Unknown=0, NotChecked=0, Total=1056 [2022-03-19 08:12:04,774 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 17 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 151 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 170 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 151 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-19 08:12:04,774 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 24 Invalid, 170 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 151 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-19 08:12:04,774 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2022-03-19 08:12:04,778 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2022-03-19 08:12:04,778 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 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), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:12:04,778 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 35 transitions. [2022-03-19 08:12:04,778 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 35 transitions. Word has length 29 [2022-03-19 08:12:04,778 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:12:04,779 INFO L478 AbstractCegarLoop]: Abstraction has 33 states and 35 transitions. [2022-03-19 08:12:04,779 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 11 states have internal predecessors, (25), 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) [2022-03-19 08:12:04,779 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 35 transitions. [2022-03-19 08:12:04,779 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-03-19 08:12:04,779 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:12:04,779 INFO L500 BasicCegarLoop]: trace histogram [10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:12:04,796 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-03-19 08:12:04,995 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-03-19 08:12:04,996 INFO L403 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:12:04,996 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:12:04,996 INFO L85 PathProgramCache]: Analyzing trace with hash -1819864638, now seen corresponding path program 17 times [2022-03-19 08:12:04,996 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:12:04,996 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1411087418] [2022-03-19 08:12:05,138 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-19 08:12:05,138 INFO L85 PathProgramCache]: Analyzing trace with hash -771227407, now seen corresponding path program 1 times [2022-03-19 08:12:05,138 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:12:05,138 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1926644334] [2022-03-19 08:12:05,138 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:12:05,139 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:12:05,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:12:05,143 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 08:12:05,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:12:05,148 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 08:12:05,149 INFO L85 PathProgramCache]: Analyzing trace with hash -1819864638, now seen corresponding path program 18 times [2022-03-19 08:12:05,149 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:12:05,149 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [341969068] [2022-03-19 08:12:05,149 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:12:05,149 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:12:05,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:12:05,273 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:12:05,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:12:05,281 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 10 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:12:05,281 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:12:05,281 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [341969068] [2022-03-19 08:12:05,281 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [341969068] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:12:05,281 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [836495333] [2022-03-19 08:12:05,281 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-19 08:12:05,281 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:12:05,282 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:12:05,282 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) [2022-03-19 08:12:05,303 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-03-19 08:12:05,333 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-03-19 08:12:05,333 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 08:12:05,334 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 11 conjunts are in the unsatisfiable core [2022-03-19 08:12:05,335 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:12:05,423 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 27 proven. 1 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2022-03-19 08:12:05,423 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:12:05,618 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 27 proven. 1 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2022-03-19 08:12:05,619 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [836495333] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:12:05,619 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:12:05,619 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 4, 8] total 21 [2022-03-19 08:12:05,619 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:12:05,619 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1411087418] [2022-03-19 08:12:05,619 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1411087418] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:12:05,619 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:12:05,619 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2022-03-19 08:12:05,619 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [104246158] [2022-03-19 08:12:05,619 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:12:05,619 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-03-19 08:12:05,620 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:12:05,620 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-03-19 08:12:05,620 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=325, Unknown=0, NotChecked=0, Total=420 [2022-03-19 08:12:05,620 INFO L87 Difference]: Start difference. First operand 33 states and 35 transitions. Second operand has 13 states, 13 states have (on average 2.076923076923077) internal successors, (27), 12 states have internal predecessors, (27), 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) [2022-03-19 08:12:05,838 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:12:05,838 INFO L93 Difference]: Finished difference Result 42 states and 46 transitions. [2022-03-19 08:12:05,839 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-03-19 08:12:05,839 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.076923076923077) internal successors, (27), 12 states have internal predecessors, (27), 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 [2022-03-19 08:12:05,839 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:12:05,839 INFO L225 Difference]: With dead ends: 42 [2022-03-19 08:12:05,839 INFO L226 Difference]: Without dead ends: 35 [2022-03-19 08:12:05,840 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 56 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=191, Invalid=739, Unknown=0, NotChecked=0, Total=930 [2022-03-19 08:12:05,840 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 18 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 180 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 201 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 180 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-19 08:12:05,840 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 19 Invalid, 201 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 180 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-19 08:12:05,841 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2022-03-19 08:12:05,844 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2022-03-19 08:12:05,844 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 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), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:12:05,845 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2022-03-19 08:12:05,845 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 31 [2022-03-19 08:12:05,845 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:12:05,845 INFO L478 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2022-03-19 08:12:05,845 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.076923076923077) internal successors, (27), 12 states have internal predecessors, (27), 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) [2022-03-19 08:12:05,845 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2022-03-19 08:12:05,846 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-03-19 08:12:05,846 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:12:05,846 INFO L500 BasicCegarLoop]: trace histogram [11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:12:05,852 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-03-19 08:12:06,050 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,SelfDestructingSolverStorable20,10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:12:06,050 INFO L403 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:12:06,050 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:12:06,051 INFO L85 PathProgramCache]: Analyzing trace with hash 1103709407, now seen corresponding path program 19 times [2022-03-19 08:12:06,051 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:12:06,051 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [245193254] [2022-03-19 08:12:06,191 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-19 08:12:06,192 INFO L85 PathProgramCache]: Analyzing trace with hash -712122063, now seen corresponding path program 1 times [2022-03-19 08:12:06,192 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:12:06,192 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1284225941] [2022-03-19 08:12:06,192 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:12:06,192 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:12:06,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:12:06,198 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 08:12:06,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:12:06,203 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 08:12:06,204 INFO L85 PathProgramCache]: Analyzing trace with hash 1103709407, now seen corresponding path program 20 times [2022-03-19 08:12:06,204 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:12:06,204 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [949849798] [2022-03-19 08:12:06,204 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:12:06,204 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:12:06,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:12:06,338 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:12:06,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:12:06,342 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 11 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:12:06,342 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:12:06,342 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [949849798] [2022-03-19 08:12:06,342 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [949849798] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:12:06,342 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1512925581] [2022-03-19 08:12:06,342 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-19 08:12:06,343 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:12:06,343 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:12:06,344 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) [2022-03-19 08:12:06,356 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-03-19 08:12:06,373 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-19 08:12:06,373 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 08:12:06,374 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 24 conjunts are in the unsatisfiable core [2022-03-19 08:12:06,375 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:12:06,478 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 11 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:12:06,479 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:12:06,892 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 11 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:12:06,892 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1512925581] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:12:06,892 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:12:06,892 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 14] total 27 [2022-03-19 08:12:06,892 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:12:06,892 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [245193254] [2022-03-19 08:12:06,892 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [245193254] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:12:06,893 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:12:06,893 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-03-19 08:12:06,893 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [615941621] [2022-03-19 08:12:06,893 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:12:06,893 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-03-19 08:12:06,893 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:12:06,893 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-03-19 08:12:06,893 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=207, Invalid=495, Unknown=0, NotChecked=0, Total=702 [2022-03-19 08:12:06,894 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 13 states have internal predecessors, (29), 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) [2022-03-19 08:12:07,120 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:12:07,120 INFO L93 Difference]: Finished difference Result 44 states and 48 transitions. [2022-03-19 08:12:07,120 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-03-19 08:12:07,120 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 13 states have internal predecessors, (29), 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 [2022-03-19 08:12:07,120 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:12:07,121 INFO L225 Difference]: With dead ends: 44 [2022-03-19 08:12:07,121 INFO L226 Difference]: Without dead ends: 37 [2022-03-19 08:12:07,121 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 54 SyntacticMatches, 2 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 93 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=403, Invalid=1003, Unknown=0, NotChecked=0, Total=1406 [2022-03-19 08:12:07,122 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 19 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 231 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 254 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 231 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-19 08:12:07,122 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 29 Invalid, 254 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 231 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-19 08:12:07,122 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2022-03-19 08:12:07,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2022-03-19 08:12:07,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 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), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:12:07,127 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 39 transitions. [2022-03-19 08:12:07,127 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 39 transitions. Word has length 33 [2022-03-19 08:12:07,128 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:12:07,128 INFO L478 AbstractCegarLoop]: Abstraction has 37 states and 39 transitions. [2022-03-19 08:12:07,128 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 13 states have internal predecessors, (29), 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) [2022-03-19 08:12:07,128 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 39 transitions. [2022-03-19 08:12:07,128 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-03-19 08:12:07,128 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:12:07,128 INFO L500 BasicCegarLoop]: trace histogram [12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:12:07,148 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-03-19 08:12:07,348 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,SelfDestructingSolverStorable21,SelfDestructingSolverStorable22 [2022-03-19 08:12:07,349 INFO L403 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:12:07,349 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:12:07,349 INFO L85 PathProgramCache]: Analyzing trace with hash 1749755068, now seen corresponding path program 21 times [2022-03-19 08:12:07,349 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:12:07,349 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [71372502] [2022-03-19 08:12:07,498 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-19 08:12:07,498 INFO L85 PathProgramCache]: Analyzing trace with hash -653016719, now seen corresponding path program 1 times [2022-03-19 08:12:07,500 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:12:07,500 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [159204433] [2022-03-19 08:12:07,500 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:12:07,500 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:12:07,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:12:07,517 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 08:12:07,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:12:07,522 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 08:12:07,522 INFO L85 PathProgramCache]: Analyzing trace with hash 1749755068, now seen corresponding path program 22 times [2022-03-19 08:12:07,522 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:12:07,522 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1184739241] [2022-03-19 08:12:07,523 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:12:07,523 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:12:07,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:12:07,655 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:12:07,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:12:07,658 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 12 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:12:07,658 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:12:07,659 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1184739241] [2022-03-19 08:12:07,659 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1184739241] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:12:07,659 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1212072413] [2022-03-19 08:12:07,659 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-19 08:12:07,659 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:12:07,659 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:12:07,660 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) [2022-03-19 08:12:07,661 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-03-19 08:12:07,686 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-19 08:12:07,687 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 08:12:07,687 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 27 conjunts are in the unsatisfiable core [2022-03-19 08:12:07,688 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:12:07,813 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:12:07,813 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:12:08,185 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:12:08,185 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1212072413] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:12:08,185 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:12:08,185 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 30 [2022-03-19 08:12:08,186 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:12:08,186 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [71372502] [2022-03-19 08:12:08,186 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [71372502] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:12:08,186 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:12:08,186 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-03-19 08:12:08,186 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [312689652] [2022-03-19 08:12:08,186 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:12:08,186 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-03-19 08:12:08,186 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:12:08,187 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-03-19 08:12:08,187 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=251, Invalid=619, Unknown=0, NotChecked=0, Total=870 [2022-03-19 08:12:08,187 INFO L87 Difference]: Start difference. First operand 37 states and 39 transitions. Second operand has 15 states, 15 states have (on average 2.066666666666667) internal successors, (31), 14 states have internal predecessors, (31), 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) [2022-03-19 08:12:08,460 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:12:08,460 INFO L93 Difference]: Finished difference Result 46 states and 50 transitions. [2022-03-19 08:12:08,460 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-03-19 08:12:08,461 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.066666666666667) internal successors, (31), 14 states have internal predecessors, (31), 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 [2022-03-19 08:12:08,461 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:12:08,461 INFO L225 Difference]: With dead ends: 46 [2022-03-19 08:12:08,461 INFO L226 Difference]: Without dead ends: 39 [2022-03-19 08:12:08,462 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 56 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=477, Invalid=1245, Unknown=0, NotChecked=0, Total=1722 [2022-03-19 08:12:08,462 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 20 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 316 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 64 SdHoareTripleChecker+Invalid, 341 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 316 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-19 08:12:08,463 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 64 Invalid, 341 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 316 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-19 08:12:08,463 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2022-03-19 08:12:08,467 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2022-03-19 08:12:08,467 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 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), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-03-19 08:12:08,467 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 41 transitions. [2022-03-19 08:12:08,467 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 41 transitions. Word has length 35 [2022-03-19 08:12:08,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:12:08,467 INFO L478 AbstractCegarLoop]: Abstraction has 39 states and 41 transitions. [2022-03-19 08:12:08,467 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 2.066666666666667) internal successors, (31), 14 states have internal predecessors, (31), 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) [2022-03-19 08:12:08,468 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 41 transitions. [2022-03-19 08:12:08,468 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-03-19 08:12:08,468 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:12:08,468 INFO L500 BasicCegarLoop]: trace histogram [13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:12:08,486 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2022-03-19 08:12:08,683 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,SelfDestructingSolverStorable23,SelfDestructingSolverStorable24 [2022-03-19 08:12:08,683 INFO L403 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:12:08,684 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:12:08,684 INFO L85 PathProgramCache]: Analyzing trace with hash -170622631, now seen corresponding path program 23 times [2022-03-19 08:12:08,684 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:12:08,684 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [410941737] [2022-03-19 08:12:08,846 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-19 08:12:08,846 INFO L85 PathProgramCache]: Analyzing trace with hash -593911375, now seen corresponding path program 1 times [2022-03-19 08:12:08,847 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:12:08,847 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [247245845] [2022-03-19 08:12:08,847 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:12:08,847 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:12:08,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:12:08,859 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 08:12:08,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:12:08,868 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 08:12:08,868 INFO L85 PathProgramCache]: Analyzing trace with hash -170622631, now seen corresponding path program 24 times [2022-03-19 08:12:08,868 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:12:08,868 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1912515949] [2022-03-19 08:12:08,868 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:12:08,868 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:12:08,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:12:09,029 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:12:09,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:12:09,033 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 13 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:12:09,033 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:12:09,033 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1912515949] [2022-03-19 08:12:09,034 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1912515949] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:12:09,034 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [701400632] [2022-03-19 08:12:09,034 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-19 08:12:09,034 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:12:09,034 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:12:09,035 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) [2022-03-19 08:12:09,036 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-03-19 08:12:09,080 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-03-19 08:12:09,080 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 08:12:09,081 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 11 conjunts are in the unsatisfiable core [2022-03-19 08:12:09,082 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:12:09,184 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 36 proven. 1 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2022-03-19 08:12:09,185 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:12:09,405 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 36 proven. 1 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2022-03-19 08:12:09,405 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [701400632] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:12:09,406 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:12:09,406 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 4, 8] total 24 [2022-03-19 08:12:09,406 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:12:09,406 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [410941737] [2022-03-19 08:12:09,406 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [410941737] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:12:09,406 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:12:09,406 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2022-03-19 08:12:09,406 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1572668108] [2022-03-19 08:12:09,406 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:12:09,407 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-03-19 08:12:09,407 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:12:09,407 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-03-19 08:12:09,407 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=436, Unknown=0, NotChecked=0, Total=552 [2022-03-19 08:12:09,407 INFO L87 Difference]: Start difference. First operand 39 states and 41 transitions. Second operand has 16 states, 16 states have (on average 2.0625) internal successors, (33), 15 states have internal predecessors, (33), 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) [2022-03-19 08:12:09,698 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:12:09,698 INFO L93 Difference]: Finished difference Result 48 states and 52 transitions. [2022-03-19 08:12:09,698 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-03-19 08:12:09,698 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.0625) internal successors, (33), 15 states have internal predecessors, (33), 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 37 [2022-03-19 08:12:09,699 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:12:09,699 INFO L225 Difference]: With dead ends: 48 [2022-03-19 08:12:09,699 INFO L226 Difference]: Without dead ends: 41 [2022-03-19 08:12:09,700 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 68 SyntacticMatches, 1 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=242, Invalid=1090, Unknown=0, NotChecked=0, Total=1332 [2022-03-19 08:12:09,700 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 21 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 357 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 59 SdHoareTripleChecker+Invalid, 384 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 357 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-19 08:12:09,700 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 59 Invalid, 384 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 357 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-19 08:12:09,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2022-03-19 08:12:09,709 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2022-03-19 08:12:09,709 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 36 states have (on average 1.0833333333333333) internal successors, (39), 36 states have internal predecessors, (39), 3 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) [2022-03-19 08:12:09,710 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 43 transitions. [2022-03-19 08:12:09,711 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 43 transitions. Word has length 37 [2022-03-19 08:12:09,711 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:12:09,711 INFO L478 AbstractCegarLoop]: Abstraction has 41 states and 43 transitions. [2022-03-19 08:12:09,711 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 2.0625) internal successors, (33), 15 states have internal predecessors, (33), 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) [2022-03-19 08:12:09,711 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 43 transitions. [2022-03-19 08:12:09,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-03-19 08:12:09,714 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:12:09,714 INFO L500 BasicCegarLoop]: trace histogram [14, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:12:09,721 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-03-19 08:12:09,919 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,SelfDestructingSolverStorable25,SelfDestructingSolverStorable26 [2022-03-19 08:12:09,919 INFO L403 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:12:09,919 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:12:09,919 INFO L85 PathProgramCache]: Analyzing trace with hash 1182345910, now seen corresponding path program 25 times [2022-03-19 08:12:09,920 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:12:09,920 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [537845121] [2022-03-19 08:12:10,078 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-19 08:12:10,081 INFO L85 PathProgramCache]: Analyzing trace with hash -534806031, now seen corresponding path program 1 times [2022-03-19 08:12:10,081 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:12:10,082 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1544201342] [2022-03-19 08:12:10,082 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:12:10,082 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:12:10,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:12:10,104 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 08:12:10,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:12:10,108 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 08:12:10,109 INFO L85 PathProgramCache]: Analyzing trace with hash 1182345910, now seen corresponding path program 26 times [2022-03-19 08:12:10,109 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:12:10,109 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1976383952] [2022-03-19 08:12:10,109 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:12:10,109 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:12:10,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:12:10,283 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:12:10,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:12:10,294 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 14 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:12:10,294 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:12:10,294 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1976383952] [2022-03-19 08:12:10,294 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1976383952] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:12:10,294 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [246677707] [2022-03-19 08:12:10,294 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-19 08:12:10,294 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:12:10,295 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:12:10,295 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) [2022-03-19 08:12:10,296 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-03-19 08:12:10,328 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-19 08:12:10,329 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 08:12:10,330 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 34 conjunts are in the unsatisfiable core [2022-03-19 08:12:10,330 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:12:10,451 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:12:10,452 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:12:11,122 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:12:11,122 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [246677707] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:12:11,122 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:12:11,122 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 20] total 37 [2022-03-19 08:12:11,123 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:12:11,123 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [537845121] [2022-03-19 08:12:11,123 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [537845121] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:12:11,123 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:12:11,123 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2022-03-19 08:12:11,123 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [736768850] [2022-03-19 08:12:11,123 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:12:11,123 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-03-19 08:12:11,123 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:12:11,123 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-03-19 08:12:11,124 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=326, Invalid=1006, Unknown=0, NotChecked=0, Total=1332 [2022-03-19 08:12:11,124 INFO L87 Difference]: Start difference. First operand 41 states and 43 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 16 states have internal predecessors, (35), 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) [2022-03-19 08:12:11,447 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:12:11,447 INFO L93 Difference]: Finished difference Result 50 states and 54 transitions. [2022-03-19 08:12:11,447 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-03-19 08:12:11,447 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 16 states have internal predecessors, (35), 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 39 [2022-03-19 08:12:11,447 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:12:11,448 INFO L225 Difference]: With dead ends: 50 [2022-03-19 08:12:11,448 INFO L226 Difference]: Without dead ends: 43 [2022-03-19 08:12:11,449 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 59 SyntacticMatches, 2 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 147 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=618, Invalid=1932, Unknown=0, NotChecked=0, Total=2550 [2022-03-19 08:12:11,449 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 22 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 402 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 54 SdHoareTripleChecker+Invalid, 431 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 402 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-03-19 08:12:11,449 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 54 Invalid, 431 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 402 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-03-19 08:12:11,450 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2022-03-19 08:12:11,454 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2022-03-19 08:12:11,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 38 states have (on average 1.0789473684210527) internal successors, (41), 38 states have internal predecessors, (41), 3 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) [2022-03-19 08:12:11,454 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 45 transitions. [2022-03-19 08:12:11,454 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 45 transitions. Word has length 39 [2022-03-19 08:12:11,454 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:12:11,454 INFO L478 AbstractCegarLoop]: Abstraction has 43 states and 45 transitions. [2022-03-19 08:12:11,454 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 16 states have internal predecessors, (35), 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) [2022-03-19 08:12:11,455 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 45 transitions. [2022-03-19 08:12:11,455 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-03-19 08:12:11,455 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:12:11,455 INFO L500 BasicCegarLoop]: trace histogram [15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:12:11,472 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-03-19 08:12:11,663 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27,SelfDestructingSolverStorable28 [2022-03-19 08:12:11,663 INFO L403 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:12:11,664 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:12:11,664 INFO L85 PathProgramCache]: Analyzing trace with hash 10023123, now seen corresponding path program 27 times [2022-03-19 08:12:11,664 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:12:11,664 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [370148660] [2022-03-19 08:12:11,789 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-19 08:12:11,790 INFO L85 PathProgramCache]: Analyzing trace with hash -475700687, now seen corresponding path program 1 times [2022-03-19 08:12:11,790 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:12:11,790 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1291178770] [2022-03-19 08:12:11,790 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:12:11,790 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:12:11,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:12:11,795 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 08:12:11,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:12:11,800 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 08:12:11,800 INFO L85 PathProgramCache]: Analyzing trace with hash 10023123, now seen corresponding path program 28 times [2022-03-19 08:12:11,800 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:12:11,800 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1951238668] [2022-03-19 08:12:11,800 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:12:11,800 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:12:11,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:12:12,007 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:12:12,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:12:12,011 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 15 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:12:12,011 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:12:12,011 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1951238668] [2022-03-19 08:12:12,011 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1951238668] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:12:12,011 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [981965914] [2022-03-19 08:12:12,011 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-19 08:12:12,011 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:12:12,012 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:12:12,013 INFO L229 MonitoredProcess]: Starting monitored process 15 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:12:12,014 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-03-19 08:12:12,046 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-19 08:12:12,046 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 08:12:12,047 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 33 conjunts are in the unsatisfiable core [2022-03-19 08:12:12,048 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:12:12,203 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:12:12,203 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:12:12,761 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:12:12,761 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [981965914] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:12:12,761 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:12:12,761 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 36 [2022-03-19 08:12:12,761 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:12:12,761 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [370148660] [2022-03-19 08:12:12,761 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [370148660] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:12:12,761 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:12:12,761 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2022-03-19 08:12:12,762 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1851168160] [2022-03-19 08:12:12,762 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:12:12,762 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-03-19 08:12:12,762 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:12:12,762 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-03-19 08:12:12,763 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=356, Invalid=904, Unknown=0, NotChecked=0, Total=1260 [2022-03-19 08:12:12,763 INFO L87 Difference]: Start difference. First operand 43 states and 45 transitions. Second operand has 18 states, 18 states have (on average 2.0555555555555554) internal successors, (37), 17 states have internal predecessors, (37), 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) [2022-03-19 08:12:13,119 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:12:13,119 INFO L93 Difference]: Finished difference Result 52 states and 56 transitions. [2022-03-19 08:12:13,119 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-03-19 08:12:13,120 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0555555555555554) internal successors, (37), 17 states have internal predecessors, (37), 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 41 [2022-03-19 08:12:13,120 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:12:13,120 INFO L225 Difference]: With dead ends: 52 [2022-03-19 08:12:13,120 INFO L226 Difference]: Without dead ends: 45 [2022-03-19 08:12:13,121 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 65 SyntacticMatches, 2 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 143 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=684, Invalid=1866, Unknown=0, NotChecked=0, Total=2550 [2022-03-19 08:12:13,121 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 23 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 475 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 69 SdHoareTripleChecker+Invalid, 506 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 475 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-19 08:12:13,121 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 69 Invalid, 506 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 475 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-19 08:12:13,122 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2022-03-19 08:12:13,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2022-03-19 08:12:13,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 40 states have (on average 1.075) internal successors, (43), 40 states have internal predecessors, (43), 3 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) [2022-03-19 08:12:13,126 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 47 transitions. [2022-03-19 08:12:13,126 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 47 transitions. Word has length 41 [2022-03-19 08:12:13,127 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:12:13,127 INFO L478 AbstractCegarLoop]: Abstraction has 45 states and 47 transitions. [2022-03-19 08:12:13,127 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 2.0555555555555554) internal successors, (37), 17 states have internal predecessors, (37), 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) [2022-03-19 08:12:13,127 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 47 transitions. [2022-03-19 08:12:13,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-03-19 08:12:13,127 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:12:13,127 INFO L500 BasicCegarLoop]: trace histogram [16, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:12:13,144 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-03-19 08:12:13,335 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,SelfDestructingSolverStorable30,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:12:13,335 INFO L403 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:12:13,336 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:12:13,336 INFO L85 PathProgramCache]: Analyzing trace with hash -1310743632, now seen corresponding path program 29 times [2022-03-19 08:12:13,336 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:12:13,336 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [769923585] [2022-03-19 08:12:13,450 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-19 08:12:13,451 INFO L85 PathProgramCache]: Analyzing trace with hash -416595343, now seen corresponding path program 1 times [2022-03-19 08:12:13,451 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:12:13,451 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1829357511] [2022-03-19 08:12:13,451 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:12:13,451 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:12:13,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:12:13,464 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 08:12:13,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:12:13,468 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 08:12:13,468 INFO L85 PathProgramCache]: Analyzing trace with hash -1310743632, now seen corresponding path program 30 times [2022-03-19 08:12:13,468 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:12:13,468 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [344554891] [2022-03-19 08:12:13,468 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:12:13,468 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:12:13,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:12:13,698 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:12:13,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:12:13,701 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 16 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:12:13,701 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:12:13,701 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [344554891] [2022-03-19 08:12:13,701 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [344554891] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:12:13,701 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [236740942] [2022-03-19 08:12:13,701 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-19 08:12:13,702 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:12:13,702 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:12:13,703 INFO L229 MonitoredProcess]: Starting monitored process 16 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:12:13,704 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-03-19 08:12:13,732 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-03-19 08:12:13,732 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 08:12:13,733 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 9 conjunts are in the unsatisfiable core [2022-03-19 08:12:13,734 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:12:13,836 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 45 proven. 1 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2022-03-19 08:12:13,836 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:12:14,032 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 45 proven. 1 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2022-03-19 08:12:14,033 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [236740942] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:12:14,033 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:12:14,033 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 4, 7] total 26 [2022-03-19 08:12:14,033 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:12:14,033 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [769923585] [2022-03-19 08:12:14,033 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [769923585] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:12:14,033 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:12:14,033 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2022-03-19 08:12:14,033 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1900062508] [2022-03-19 08:12:14,033 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:12:14,034 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-03-19 08:12:14,034 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:12:14,034 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-03-19 08:12:14,034 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=127, Invalid=523, Unknown=0, NotChecked=0, Total=650 [2022-03-19 08:12:14,034 INFO L87 Difference]: Start difference. First operand 45 states and 47 transitions. Second operand has 19 states, 19 states have (on average 2.0526315789473686) internal successors, (39), 18 states have internal predecessors, (39), 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) [2022-03-19 08:12:14,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:12:14,439 INFO L93 Difference]: Finished difference Result 54 states and 58 transitions. [2022-03-19 08:12:14,440 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-03-19 08:12:14,440 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.0526315789473686) internal successors, (39), 18 states have internal predecessors, (39), 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 43 [2022-03-19 08:12:14,440 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:12:14,440 INFO L225 Difference]: With dead ends: 54 [2022-03-19 08:12:14,440 INFO L226 Difference]: Without dead ends: 47 [2022-03-19 08:12:14,441 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 81 SyntacticMatches, 1 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 134 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=279, Invalid=1443, Unknown=0, NotChecked=0, Total=1722 [2022-03-19 08:12:14,441 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 24 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 552 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 585 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 552 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-19 08:12:14,441 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 84 Invalid, 585 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 552 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-19 08:12:14,442 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2022-03-19 08:12:14,447 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2022-03-19 08:12:14,447 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 42 states have (on average 1.0714285714285714) internal successors, (45), 42 states have internal predecessors, (45), 3 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) [2022-03-19 08:12:14,447 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 49 transitions. [2022-03-19 08:12:14,447 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 49 transitions. Word has length 43 [2022-03-19 08:12:14,447 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:12:14,448 INFO L478 AbstractCegarLoop]: Abstraction has 47 states and 49 transitions. [2022-03-19 08:12:14,448 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 2.0526315789473686) internal successors, (39), 18 states have internal predecessors, (39), 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) [2022-03-19 08:12:14,448 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 49 transitions. [2022-03-19 08:12:14,448 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-03-19 08:12:14,448 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:12:14,448 INFO L500 BasicCegarLoop]: trace histogram [17, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:12:14,467 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-03-19 08:12:14,653 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,SelfDestructingSolverStorable32,16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:12:14,654 INFO L403 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:12:14,654 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:12:14,654 INFO L85 PathProgramCache]: Analyzing trace with hash 742724429, now seen corresponding path program 31 times [2022-03-19 08:12:14,654 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:12:14,654 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1952038383] [2022-03-19 08:12:14,766 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-19 08:12:14,767 INFO L85 PathProgramCache]: Analyzing trace with hash -357489999, now seen corresponding path program 1 times [2022-03-19 08:12:14,767 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:12:14,767 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [13903078] [2022-03-19 08:12:14,767 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:12:14,767 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:12:14,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:12:14,772 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 08:12:14,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:12:14,784 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 08:12:14,784 INFO L85 PathProgramCache]: Analyzing trace with hash 742724429, now seen corresponding path program 32 times [2022-03-19 08:12:14,784 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:12:14,784 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2054136822] [2022-03-19 08:12:14,784 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:12:14,784 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:12:14,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:12:15,007 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:12:15,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:12:15,014 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 17 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:12:15,014 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:12:15,014 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2054136822] [2022-03-19 08:12:15,015 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2054136822] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:12:15,015 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [808771598] [2022-03-19 08:12:15,015 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-19 08:12:15,015 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:12:15,015 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:12:15,016 INFO L229 MonitoredProcess]: Starting monitored process 17 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:12:15,016 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-03-19 08:12:15,056 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-19 08:12:15,056 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 08:12:15,057 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 36 conjunts are in the unsatisfiable core [2022-03-19 08:12:15,058 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:12:15,188 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 17 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:12:15,189 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:12:16,187 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 17 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:12:16,187 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [808771598] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:12:16,187 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:12:16,187 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19, 20] total 39 [2022-03-19 08:12:16,187 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:12:16,187 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1952038383] [2022-03-19 08:12:16,188 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1952038383] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:12:16,188 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:12:16,188 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2022-03-19 08:12:16,188 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1123871745] [2022-03-19 08:12:16,188 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:12:16,188 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-03-19 08:12:16,188 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:12:16,188 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-03-19 08:12:16,189 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=417, Invalid=1065, Unknown=0, NotChecked=0, Total=1482 [2022-03-19 08:12:16,189 INFO L87 Difference]: Start difference. First operand 47 states and 49 transitions. Second operand has 20 states, 20 states have (on average 2.05) internal successors, (41), 19 states have internal predecessors, (41), 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) [2022-03-19 08:12:16,588 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:12:16,589 INFO L93 Difference]: Finished difference Result 56 states and 60 transitions. [2022-03-19 08:12:16,589 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-03-19 08:12:16,589 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.05) internal successors, (41), 19 states have internal predecessors, (41), 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 45 [2022-03-19 08:12:16,589 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:12:16,590 INFO L225 Difference]: With dead ends: 56 [2022-03-19 08:12:16,590 INFO L226 Difference]: Without dead ends: 49 [2022-03-19 08:12:16,590 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 72 SyntacticMatches, 2 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 192 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=823, Invalid=2257, Unknown=0, NotChecked=0, Total=3080 [2022-03-19 08:12:16,591 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 25 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 573 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 608 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 573 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-19 08:12:16,591 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 49 Invalid, 608 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 573 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-19 08:12:16,591 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2022-03-19 08:12:16,595 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2022-03-19 08:12:16,596 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 44 states have (on average 1.0681818181818181) internal successors, (47), 44 states have internal predecessors, (47), 3 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) [2022-03-19 08:12:16,596 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 51 transitions. [2022-03-19 08:12:16,596 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 51 transitions. Word has length 45 [2022-03-19 08:12:16,596 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:12:16,596 INFO L478 AbstractCegarLoop]: Abstraction has 49 states and 51 transitions. [2022-03-19 08:12:16,596 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.05) internal successors, (41), 19 states have internal predecessors, (41), 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) [2022-03-19 08:12:16,596 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 51 transitions. [2022-03-19 08:12:16,597 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-03-19 08:12:16,597 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:12:16,597 INFO L500 BasicCegarLoop]: trace histogram [18, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:12:16,617 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-03-19 08:12:16,806 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33,SelfDestructingSolverStorable34 [2022-03-19 08:12:16,806 INFO L403 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:12:16,806 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:12:16,807 INFO L85 PathProgramCache]: Analyzing trace with hash -1559425110, now seen corresponding path program 33 times [2022-03-19 08:12:16,807 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:12:16,807 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [821522307] [2022-03-19 08:12:16,922 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-19 08:12:16,922 INFO L85 PathProgramCache]: Analyzing trace with hash -298384655, now seen corresponding path program 1 times [2022-03-19 08:12:16,922 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:12:16,923 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1047071418] [2022-03-19 08:12:16,923 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:12:16,923 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:12:16,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:12:16,929 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 08:12:16,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:12:16,941 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 08:12:16,941 INFO L85 PathProgramCache]: Analyzing trace with hash -1559425110, now seen corresponding path program 34 times [2022-03-19 08:12:16,941 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:12:16,942 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [83303570] [2022-03-19 08:12:16,942 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:12:16,942 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:12:16,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:12:17,168 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:12:17,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:12:17,184 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 18 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:12:17,184 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:12:17,184 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [83303570] [2022-03-19 08:12:17,184 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [83303570] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:12:17,184 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [947285807] [2022-03-19 08:12:17,184 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-19 08:12:17,185 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:12:17,185 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:12:17,186 INFO L229 MonitoredProcess]: Starting monitored process 18 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:12:17,187 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-03-19 08:12:17,224 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-19 08:12:17,225 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 08:12:17,226 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 38 conjunts are in the unsatisfiable core [2022-03-19 08:12:17,226 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:12:17,356 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 18 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:12:17,357 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:12:18,429 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 18 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:12:18,430 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [947285807] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:12:18,430 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:12:18,430 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20, 21] total 41 [2022-03-19 08:12:18,430 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:12:18,430 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [821522307] [2022-03-19 08:12:18,430 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [821522307] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:12:18,430 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:12:18,430 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2022-03-19 08:12:18,430 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [933014484] [2022-03-19 08:12:18,430 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:12:18,431 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-03-19 08:12:18,431 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:12:18,431 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-03-19 08:12:18,431 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=459, Invalid=1181, Unknown=0, NotChecked=0, Total=1640 [2022-03-19 08:12:18,432 INFO L87 Difference]: Start difference. First operand 49 states and 51 transitions. Second operand has 21 states, 21 states have (on average 2.0476190476190474) internal successors, (43), 20 states have internal predecessors, (43), 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) [2022-03-19 08:12:18,865 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:12:18,865 INFO L93 Difference]: Finished difference Result 58 states and 62 transitions. [2022-03-19 08:12:18,865 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-03-19 08:12:18,865 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 2.0476190476190474) internal successors, (43), 20 states have internal predecessors, (43), 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 47 [2022-03-19 08:12:18,866 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:12:18,866 INFO L225 Difference]: With dead ends: 58 [2022-03-19 08:12:18,866 INFO L226 Difference]: Without dead ends: 51 [2022-03-19 08:12:18,867 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 75 SyntacticMatches, 2 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 212 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=907, Invalid=2515, Unknown=0, NotChecked=0, Total=3422 [2022-03-19 08:12:18,867 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 26 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 604 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 641 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 604 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-03-19 08:12:18,867 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 19 Invalid, 641 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 604 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-03-19 08:12:18,868 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2022-03-19 08:12:18,873 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2022-03-19 08:12:18,874 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 46 states have (on average 1.065217391304348) internal successors, (49), 46 states have internal predecessors, (49), 3 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) [2022-03-19 08:12:18,874 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 53 transitions. [2022-03-19 08:12:18,874 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 53 transitions. Word has length 47 [2022-03-19 08:12:18,874 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:12:18,874 INFO L478 AbstractCegarLoop]: Abstraction has 51 states and 53 transitions. [2022-03-19 08:12:18,875 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 2.0476190476190474) internal successors, (43), 20 states have internal predecessors, (43), 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) [2022-03-19 08:12:18,875 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 53 transitions. [2022-03-19 08:12:18,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-03-19 08:12:18,875 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:12:18,875 INFO L500 BasicCegarLoop]: trace histogram [19, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:12:18,895 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-03-19 08:12:19,087 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35,18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2022-03-19 08:12:19,088 INFO L403 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:12:19,088 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:12:19,088 INFO L85 PathProgramCache]: Analyzing trace with hash -2016974649, now seen corresponding path program 35 times [2022-03-19 08:12:19,088 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:12:19,088 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1215337879] [2022-03-19 08:12:19,225 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-19 08:12:19,226 INFO L85 PathProgramCache]: Analyzing trace with hash -239279311, now seen corresponding path program 1 times [2022-03-19 08:12:19,226 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:12:19,226 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2000417262] [2022-03-19 08:12:19,226 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:12:19,226 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:12:19,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:12:19,231 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 08:12:19,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:12:19,234 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 08:12:19,235 INFO L85 PathProgramCache]: Analyzing trace with hash -2016974649, now seen corresponding path program 36 times [2022-03-19 08:12:19,235 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:12:19,235 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [605430727] [2022-03-19 08:12:19,235 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:12:19,235 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:12:19,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:12:19,485 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:12:19,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:12:19,488 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 19 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:12:19,488 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:12:19,488 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [605430727] [2022-03-19 08:12:19,488 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [605430727] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:12:19,489 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [710824197] [2022-03-19 08:12:19,489 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-19 08:12:19,489 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:12:19,489 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:12:19,490 INFO L229 MonitoredProcess]: Starting monitored process 19 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:12:19,491 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-03-19 08:12:19,535 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-03-19 08:12:19,536 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 08:12:19,536 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 9 conjunts are in the unsatisfiable core [2022-03-19 08:12:19,537 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:12:19,646 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 54 proven. 1 refuted. 0 times theorem prover too weak. 306 trivial. 0 not checked. [2022-03-19 08:12:19,646 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:12:19,851 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 54 proven. 1 refuted. 0 times theorem prover too weak. 306 trivial. 0 not checked. [2022-03-19 08:12:19,852 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [710824197] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:12:19,852 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:12:19,852 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 4, 7] total 29 [2022-03-19 08:12:19,852 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:12:19,852 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1215337879] [2022-03-19 08:12:19,852 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1215337879] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:12:19,852 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:12:19,852 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2022-03-19 08:12:19,852 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1463310625] [2022-03-19 08:12:19,852 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:12:19,853 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-03-19 08:12:19,853 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:12:19,853 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-03-19 08:12:19,853 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=148, Invalid=664, Unknown=0, NotChecked=0, Total=812 [2022-03-19 08:12:19,853 INFO L87 Difference]: Start difference. First operand 51 states and 53 transitions. Second operand has 22 states, 22 states have (on average 2.0454545454545454) internal successors, (45), 21 states have internal predecessors, (45), 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) [2022-03-19 08:12:20,377 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:12:20,377 INFO L93 Difference]: Finished difference Result 60 states and 64 transitions. [2022-03-19 08:12:20,377 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-03-19 08:12:20,377 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0454545454545454) internal successors, (45), 21 states have internal predecessors, (45), 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 49 [2022-03-19 08:12:20,378 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:12:20,378 INFO L225 Difference]: With dead ends: 60 [2022-03-19 08:12:20,378 INFO L226 Difference]: Without dead ends: 53 [2022-03-19 08:12:20,379 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 93 SyntacticMatches, 1 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 185 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=330, Invalid=1926, Unknown=0, NotChecked=0, Total=2256 [2022-03-19 08:12:20,379 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 27 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 759 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 89 SdHoareTripleChecker+Invalid, 798 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 759 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-19 08:12:20,380 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 89 Invalid, 798 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 759 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-19 08:12:20,380 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2022-03-19 08:12:20,385 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2022-03-19 08:12:20,385 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 48 states have (on average 1.0625) internal successors, (51), 48 states have internal predecessors, (51), 3 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) [2022-03-19 08:12:20,386 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 55 transitions. [2022-03-19 08:12:20,386 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 55 transitions. Word has length 49 [2022-03-19 08:12:20,386 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:12:20,386 INFO L478 AbstractCegarLoop]: Abstraction has 53 states and 55 transitions. [2022-03-19 08:12:20,386 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 2.0454545454545454) internal successors, (45), 21 states have internal predecessors, (45), 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) [2022-03-19 08:12:20,386 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 55 transitions. [2022-03-19 08:12:20,387 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2022-03-19 08:12:20,387 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:12:20,387 INFO L500 BasicCegarLoop]: trace histogram [20, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:12:20,391 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-03-19 08:12:20,587 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37,SelfDestructingSolverStorable38 [2022-03-19 08:12:20,588 INFO L403 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:12:20,588 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:12:20,588 INFO L85 PathProgramCache]: Analyzing trace with hash 659549860, now seen corresponding path program 37 times [2022-03-19 08:12:20,588 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:12:20,588 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1285850104] [2022-03-19 08:12:20,712 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-19 08:12:20,712 INFO L85 PathProgramCache]: Analyzing trace with hash -180173967, now seen corresponding path program 1 times [2022-03-19 08:12:20,713 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:12:20,713 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1810883372] [2022-03-19 08:12:20,713 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:12:20,713 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:12:20,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:12:20,718 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 08:12:20,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:12:20,724 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 08:12:20,724 INFO L85 PathProgramCache]: Analyzing trace with hash 659549860, now seen corresponding path program 38 times [2022-03-19 08:12:20,724 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:12:20,724 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [826655216] [2022-03-19 08:12:20,724 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:12:20,725 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:12:20,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:12:21,070 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:12:21,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:12:21,074 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 20 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:12:21,074 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:12:21,074 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [826655216] [2022-03-19 08:12:21,074 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [826655216] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:12:21,074 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2084626342] [2022-03-19 08:12:21,074 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-19 08:12:21,074 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:12:21,075 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:12:21,092 INFO L229 MonitoredProcess]: Starting monitored process 20 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:12:21,119 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-03-19 08:12:21,143 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-19 08:12:21,143 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 08:12:21,144 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 42 conjunts are in the unsatisfiable core [2022-03-19 08:12:21,145 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:12:21,303 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 20 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:12:21,303 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:12:22,697 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 20 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:12:22,697 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2084626342] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:12:22,697 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:12:22,697 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22, 23] total 45 [2022-03-19 08:12:22,698 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:12:22,698 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1285850104] [2022-03-19 08:12:22,698 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1285850104] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:12:22,698 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:12:22,698 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2022-03-19 08:12:22,698 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [113714591] [2022-03-19 08:12:22,698 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:12:22,698 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-03-19 08:12:22,698 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:12:22,698 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-03-19 08:12:22,699 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=549, Invalid=1431, Unknown=0, NotChecked=0, Total=1980 [2022-03-19 08:12:22,699 INFO L87 Difference]: Start difference. First operand 53 states and 55 transitions. Second operand has 23 states, 23 states have (on average 2.0434782608695654) internal successors, (47), 22 states have internal predecessors, (47), 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) [2022-03-19 08:12:23,237 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:12:23,237 INFO L93 Difference]: Finished difference Result 62 states and 66 transitions. [2022-03-19 08:12:23,239 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-03-19 08:12:23,239 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.0434782608695654) internal successors, (47), 22 states have internal predecessors, (47), 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 51 [2022-03-19 08:12:23,239 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:12:23,239 INFO L225 Difference]: With dead ends: 62 [2022-03-19 08:12:23,239 INFO L226 Difference]: Without dead ends: 55 [2022-03-19 08:12:23,241 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 81 SyntacticMatches, 2 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 255 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1087, Invalid=3073, Unknown=0, NotChecked=0, Total=4160 [2022-03-19 08:12:23,241 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 28 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 786 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 827 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 786 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-19 08:12:23,241 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 49 Invalid, 827 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 786 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-19 08:12:23,241 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2022-03-19 08:12:23,248 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2022-03-19 08:12:23,249 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 50 states have (on average 1.06) internal successors, (53), 50 states have internal predecessors, (53), 3 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) [2022-03-19 08:12:23,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 57 transitions. [2022-03-19 08:12:23,251 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 57 transitions. Word has length 51 [2022-03-19 08:12:23,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:12:23,251 INFO L478 AbstractCegarLoop]: Abstraction has 55 states and 57 transitions. [2022-03-19 08:12:23,251 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 2.0434782608695654) internal successors, (47), 22 states have internal predecessors, (47), 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) [2022-03-19 08:12:23,251 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 57 transitions. [2022-03-19 08:12:23,251 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2022-03-19 08:12:23,251 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:12:23,251 INFO L500 BasicCegarLoop]: trace histogram [21, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:12:23,268 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-03-19 08:12:23,463 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,20 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2022-03-19 08:12:23,463 INFO L403 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:12:23,464 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:12:23,464 INFO L85 PathProgramCache]: Analyzing trace with hash 114192705, now seen corresponding path program 39 times [2022-03-19 08:12:23,464 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:12:23,464 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [616187900] [2022-03-19 08:12:23,578 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-19 08:12:23,578 INFO L85 PathProgramCache]: Analyzing trace with hash -121068623, now seen corresponding path program 1 times [2022-03-19 08:12:23,578 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:12:23,578 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1983266313] [2022-03-19 08:12:23,578 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:12:23,579 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:12:23,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:12:23,585 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 08:12:23,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:12:23,590 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 08:12:23,590 INFO L85 PathProgramCache]: Analyzing trace with hash 114192705, now seen corresponding path program 40 times [2022-03-19 08:12:23,590 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:12:23,590 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [660648963] [2022-03-19 08:12:23,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:12:23,590 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:12:23,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:12:23,963 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:12:23,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:12:23,966 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 21 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:12:23,966 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:12:23,966 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [660648963] [2022-03-19 08:12:23,966 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [660648963] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:12:23,966 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1647837665] [2022-03-19 08:12:23,966 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-19 08:12:23,967 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:12:23,967 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:12:23,968 INFO L229 MonitoredProcess]: Starting monitored process 21 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:12:23,968 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-03-19 08:12:24,012 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-19 08:12:24,012 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 08:12:24,013 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 45 conjunts are in the unsatisfiable core [2022-03-19 08:12:24,014 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:12:24,208 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:12:24,209 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:12:25,542 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:12:25,543 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1647837665] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:12:25,543 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:12:25,543 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 48 [2022-03-19 08:12:25,543 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:12:25,543 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [616187900] [2022-03-19 08:12:25,543 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [616187900] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:12:25,543 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:12:25,543 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2022-03-19 08:12:25,543 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1385296991] [2022-03-19 08:12:25,543 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:12:25,543 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-03-19 08:12:25,544 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:12:25,544 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-03-19 08:12:25,544 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=620, Invalid=1636, Unknown=0, NotChecked=0, Total=2256 [2022-03-19 08:12:25,545 INFO L87 Difference]: Start difference. First operand 55 states and 57 transitions. Second operand has 24 states, 24 states have (on average 2.0416666666666665) internal successors, (49), 23 states have internal predecessors, (49), 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) [2022-03-19 08:12:26,146 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:12:26,147 INFO L93 Difference]: Finished difference Result 64 states and 68 transitions. [2022-03-19 08:12:26,147 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-03-19 08:12:26,147 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.0416666666666665) internal successors, (49), 23 states have internal predecessors, (49), 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 53 [2022-03-19 08:12:26,148 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:12:26,148 INFO L225 Difference]: With dead ends: 64 [2022-03-19 08:12:26,148 INFO L226 Difference]: Without dead ends: 57 [2022-03-19 08:12:26,149 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 83 SyntacticMatches, 2 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 260 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1206, Invalid=3486, Unknown=0, NotChecked=0, Total=4692 [2022-03-19 08:12:26,150 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 29 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 925 mSolverCounterSat, 43 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 99 SdHoareTripleChecker+Invalid, 968 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 43 IncrementalHoareTripleChecker+Valid, 925 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-19 08:12:26,150 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 99 Invalid, 968 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [43 Valid, 925 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-19 08:12:26,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2022-03-19 08:12:26,155 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2022-03-19 08:12:26,155 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 52 states have (on average 1.0576923076923077) internal successors, (55), 52 states have internal predecessors, (55), 3 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) [2022-03-19 08:12:26,155 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 59 transitions. [2022-03-19 08:12:26,155 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 59 transitions. Word has length 53 [2022-03-19 08:12:26,155 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:12:26,156 INFO L478 AbstractCegarLoop]: Abstraction has 57 states and 59 transitions. [2022-03-19 08:12:26,156 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 2.0416666666666665) internal successors, (49), 23 states have internal predecessors, (49), 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) [2022-03-19 08:12:26,156 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 59 transitions. [2022-03-19 08:12:26,156 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-03-19 08:12:26,156 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:12:26,156 INFO L500 BasicCegarLoop]: trace histogram [22, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:12:26,176 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-03-19 08:12:26,368 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable41,SelfDestructingSolverStorable42 [2022-03-19 08:12:26,369 INFO L403 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:12:26,369 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:12:26,369 INFO L85 PathProgramCache]: Analyzing trace with hash 11976862, now seen corresponding path program 41 times [2022-03-19 08:12:26,369 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:12:26,369 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [650780656] [2022-03-19 08:12:26,481 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-19 08:12:26,481 INFO L85 PathProgramCache]: Analyzing trace with hash -61963279, now seen corresponding path program 1 times [2022-03-19 08:12:26,481 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:12:26,481 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2122582876] [2022-03-19 08:12:26,481 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:12:26,482 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:12:26,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:12:26,487 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 08:12:26,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:12:26,500 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 08:12:26,500 INFO L85 PathProgramCache]: Analyzing trace with hash 11976862, now seen corresponding path program 42 times [2022-03-19 08:12:26,501 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:12:26,501 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [842030512] [2022-03-19 08:12:26,501 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:12:26,501 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:12:26,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:12:26,856 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:12:26,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:12:26,868 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 22 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:12:26,868 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:12:26,868 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [842030512] [2022-03-19 08:12:26,868 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [842030512] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:12:26,868 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1243201525] [2022-03-19 08:12:26,869 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-19 08:12:26,869 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:12:26,869 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:12:26,870 INFO L229 MonitoredProcess]: Starting monitored process 22 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:12:26,891 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-03-19 08:12:26,935 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-03-19 08:12:26,935 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 08:12:26,936 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 9 conjunts are in the unsatisfiable core [2022-03-19 08:12:26,937 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:12:27,075 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 63 proven. 1 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2022-03-19 08:12:27,075 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:12:27,297 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 63 proven. 1 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2022-03-19 08:12:27,297 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1243201525] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:12:27,297 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:12:27,297 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 4, 7] total 32 [2022-03-19 08:12:27,297 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:12:27,297 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [650780656] [2022-03-19 08:12:27,297 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [650780656] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:12:27,297 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:12:27,297 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2022-03-19 08:12:27,298 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [235846478] [2022-03-19 08:12:27,298 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:12:27,298 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-03-19 08:12:27,298 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:12:27,298 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-03-19 08:12:27,298 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=169, Invalid=823, Unknown=0, NotChecked=0, Total=992 [2022-03-19 08:12:27,298 INFO L87 Difference]: Start difference. First operand 57 states and 59 transitions. Second operand has 25 states, 25 states have (on average 2.04) internal successors, (51), 24 states have internal predecessors, (51), 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) [2022-03-19 08:12:27,976 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:12:27,977 INFO L93 Difference]: Finished difference Result 66 states and 70 transitions. [2022-03-19 08:12:27,977 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-03-19 08:12:27,977 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.04) internal successors, (51), 24 states have internal predecessors, (51), 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 55 [2022-03-19 08:12:27,977 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:12:27,978 INFO L225 Difference]: With dead ends: 66 [2022-03-19 08:12:27,978 INFO L226 Difference]: Without dead ends: 59 [2022-03-19 08:12:27,978 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 105 SyntacticMatches, 1 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 245 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=381, Invalid=2481, Unknown=0, NotChecked=0, Total=2862 [2022-03-19 08:12:27,979 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 30 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 936 mSolverCounterSat, 45 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 981 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 45 IncrementalHoareTripleChecker+Valid, 936 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-03-19 08:12:27,979 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 39 Invalid, 981 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [45 Valid, 936 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-03-19 08:12:27,979 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2022-03-19 08:12:27,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2022-03-19 08:12:27,985 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 54 states have (on average 1.0555555555555556) internal successors, (57), 54 states have internal predecessors, (57), 3 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) [2022-03-19 08:12:27,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 61 transitions. [2022-03-19 08:12:27,985 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 61 transitions. Word has length 55 [2022-03-19 08:12:27,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:12:27,985 INFO L478 AbstractCegarLoop]: Abstraction has 59 states and 61 transitions. [2022-03-19 08:12:27,985 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 2.04) internal successors, (51), 24 states have internal predecessors, (51), 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) [2022-03-19 08:12:27,986 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 61 transitions. [2022-03-19 08:12:27,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2022-03-19 08:12:27,986 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:12:27,986 INFO L500 BasicCegarLoop]: trace histogram [23, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:12:27,990 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2022-03-19 08:12:28,186 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable43,SelfDestructingSolverStorable44 [2022-03-19 08:12:28,186 INFO L403 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:12:28,187 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:12:28,187 INFO L85 PathProgramCache]: Analyzing trace with hash 566799547, now seen corresponding path program 43 times [2022-03-19 08:12:28,187 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:12:28,187 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [736523805] [2022-03-19 08:12:28,298 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-19 08:12:28,298 INFO L85 PathProgramCache]: Analyzing trace with hash -2857935, now seen corresponding path program 1 times [2022-03-19 08:12:28,298 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:12:28,298 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1418843247] [2022-03-19 08:12:28,298 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:12:28,298 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:12:28,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:12:28,302 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 08:12:28,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:12:28,306 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 08:12:28,307 INFO L85 PathProgramCache]: Analyzing trace with hash 566799547, now seen corresponding path program 44 times [2022-03-19 08:12:28,307 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:12:28,307 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [845563254] [2022-03-19 08:12:28,307 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:12:28,307 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:12:28,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:12:28,651 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:12:28,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:12:28,669 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 23 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:12:28,670 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:12:28,670 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [845563254] [2022-03-19 08:12:28,670 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [845563254] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:12:28,670 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [483683694] [2022-03-19 08:12:28,670 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-19 08:12:28,670 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:12:28,670 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:12:28,671 INFO L229 MonitoredProcess]: Starting monitored process 23 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:12:28,672 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-03-19 08:12:28,716 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-19 08:12:28,717 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 08:12:28,718 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 48 conjunts are in the unsatisfiable core [2022-03-19 08:12:28,719 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:12:28,880 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 23 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:12:28,880 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:12:30,903 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 23 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:12:30,904 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [483683694] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:12:30,904 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:12:30,904 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25, 26] total 51 [2022-03-19 08:12:30,904 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:12:30,904 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [736523805] [2022-03-19 08:12:30,904 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [736523805] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:12:30,904 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:12:30,904 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2022-03-19 08:12:30,904 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1752082136] [2022-03-19 08:12:30,905 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:12:30,905 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-03-19 08:12:30,905 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:12:30,905 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-03-19 08:12:30,906 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=699, Invalid=1851, Unknown=0, NotChecked=0, Total=2550 [2022-03-19 08:12:30,906 INFO L87 Difference]: Start difference. First operand 59 states and 61 transitions. Second operand has 26 states, 26 states have (on average 2.0384615384615383) internal successors, (53), 25 states have internal predecessors, (53), 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) [2022-03-19 08:12:31,580 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:12:31,580 INFO L93 Difference]: Finished difference Result 68 states and 72 transitions. [2022-03-19 08:12:31,580 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-03-19 08:12:31,580 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.0384615384615383) internal successors, (53), 25 states have internal predecessors, (53), 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 57 [2022-03-19 08:12:31,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:12:31,581 INFO L225 Difference]: With dead ends: 68 [2022-03-19 08:12:31,581 INFO L226 Difference]: Without dead ends: 61 [2022-03-19 08:12:31,582 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 90 SyntacticMatches, 2 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 327 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=1387, Invalid=4015, Unknown=0, NotChecked=0, Total=5402 [2022-03-19 08:12:31,582 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 31 mSDsluCounter, 102 mSDsCounter, 0 mSdLazyCounter, 1113 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 114 SdHoareTripleChecker+Invalid, 1160 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 1113 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-03-19 08:12:31,583 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [31 Valid, 114 Invalid, 1160 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 1113 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-03-19 08:12:31,583 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2022-03-19 08:12:31,588 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2022-03-19 08:12:31,588 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 56 states have (on average 1.0535714285714286) internal successors, (59), 56 states have internal predecessors, (59), 3 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) [2022-03-19 08:12:31,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 63 transitions. [2022-03-19 08:12:31,588 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 63 transitions. Word has length 57 [2022-03-19 08:12:31,589 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:12:31,589 INFO L478 AbstractCegarLoop]: Abstraction has 61 states and 63 transitions. [2022-03-19 08:12:31,589 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 2.0384615384615383) internal successors, (53), 25 states have internal predecessors, (53), 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) [2022-03-19 08:12:31,589 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 63 transitions. [2022-03-19 08:12:31,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-03-19 08:12:31,589 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:12:31,589 INFO L500 BasicCegarLoop]: trace histogram [24, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:12:31,608 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2022-03-19 08:12:31,803 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45,SelfDestructingSolverStorable46,23 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:12:31,803 INFO L403 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:12:31,804 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:12:31,804 INFO L85 PathProgramCache]: Analyzing trace with hash 1175455128, now seen corresponding path program 45 times [2022-03-19 08:12:31,804 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:12:31,804 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1370079264] [2022-03-19 08:12:31,952 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-19 08:12:31,953 INFO L85 PathProgramCache]: Analyzing trace with hash 56247409, now seen corresponding path program 1 times [2022-03-19 08:12:31,953 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:12:31,953 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2028752961] [2022-03-19 08:12:31,953 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:12:31,953 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:12:31,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:12:31,958 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 08:12:31,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:12:31,980 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 08:12:31,980 INFO L85 PathProgramCache]: Analyzing trace with hash 1175455128, now seen corresponding path program 46 times [2022-03-19 08:12:31,980 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:12:31,980 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1290276539] [2022-03-19 08:12:31,980 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:12:31,980 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:12:31,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:12:32,347 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:12:32,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:12:32,364 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 24 proven. 552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:12:32,364 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:12:32,364 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1290276539] [2022-03-19 08:12:32,364 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1290276539] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:12:32,364 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [627389165] [2022-03-19 08:12:32,365 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-19 08:12:32,365 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:12:32,365 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:12:32,366 INFO L229 MonitoredProcess]: Starting monitored process 24 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:12:32,391 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-03-19 08:12:32,419 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-19 08:12:32,420 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 08:12:32,421 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 50 conjunts are in the unsatisfiable core [2022-03-19 08:12:32,422 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:12:32,612 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 24 proven. 552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:12:32,612 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:12:35,064 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 24 proven. 552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:12:35,065 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [627389165] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:12:35,065 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:12:35,065 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26, 27] total 53 [2022-03-19 08:12:35,065 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:12:35,065 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1370079264] [2022-03-19 08:12:35,065 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1370079264] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:12:35,065 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:12:35,065 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2022-03-19 08:12:35,065 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [969425162] [2022-03-19 08:12:35,065 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:12:35,066 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-03-19 08:12:35,066 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:12:35,066 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-03-19 08:12:35,066 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=753, Invalid=2003, Unknown=0, NotChecked=0, Total=2756 [2022-03-19 08:12:35,067 INFO L87 Difference]: Start difference. First operand 61 states and 63 transitions. Second operand has 27 states, 27 states have (on average 2.037037037037037) internal successors, (55), 26 states have internal predecessors, (55), 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) [2022-03-19 08:12:35,827 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:12:35,827 INFO L93 Difference]: Finished difference Result 70 states and 74 transitions. [2022-03-19 08:12:35,827 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-03-19 08:12:35,827 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 2.037037037037037) internal successors, (55), 26 states have internal predecessors, (55), 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 59 [2022-03-19 08:12:35,827 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:12:35,828 INFO L225 Difference]: With dead ends: 70 [2022-03-19 08:12:35,828 INFO L226 Difference]: Without dead ends: 63 [2022-03-19 08:12:35,828 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 93 SyntacticMatches, 2 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 353 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=1495, Invalid=4357, Unknown=0, NotChecked=0, Total=5852 [2022-03-19 08:12:35,828 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 32 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 1186 mSolverCounterSat, 49 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 99 SdHoareTripleChecker+Invalid, 1235 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 49 IncrementalHoareTripleChecker+Valid, 1186 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-03-19 08:12:35,829 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 99 Invalid, 1235 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [49 Valid, 1186 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-03-19 08:12:35,829 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2022-03-19 08:12:35,834 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2022-03-19 08:12:35,835 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 58 states have (on average 1.0517241379310345) internal successors, (61), 58 states have internal predecessors, (61), 3 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) [2022-03-19 08:12:35,835 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 65 transitions. [2022-03-19 08:12:35,835 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 65 transitions. Word has length 59 [2022-03-19 08:12:35,835 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:12:35,835 INFO L478 AbstractCegarLoop]: Abstraction has 63 states and 65 transitions. [2022-03-19 08:12:35,835 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 2.037037037037037) internal successors, (55), 26 states have internal predecessors, (55), 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) [2022-03-19 08:12:35,835 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 65 transitions. [2022-03-19 08:12:35,836 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-03-19 08:12:35,836 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:12:35,836 INFO L500 BasicCegarLoop]: trace histogram [25, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:12:35,852 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Ended with exit code 0 [2022-03-19 08:12:36,036 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47,SelfDestructingSolverStorable48,24 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:12:36,037 INFO L403 AbstractCegarLoop]: === Iteration 27 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:12:36,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:12:36,037 INFO L85 PathProgramCache]: Analyzing trace with hash 1977916213, now seen corresponding path program 47 times [2022-03-19 08:12:36,037 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:12:36,037 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1588523644] [2022-03-19 08:12:36,175 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-19 08:12:36,176 INFO L85 PathProgramCache]: Analyzing trace with hash 115352753, now seen corresponding path program 1 times [2022-03-19 08:12:36,176 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:12:36,176 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1425213727] [2022-03-19 08:12:36,176 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:12:36,176 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:12:36,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:12:36,180 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 08:12:36,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:12:36,184 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 08:12:36,184 INFO L85 PathProgramCache]: Analyzing trace with hash 1977916213, now seen corresponding path program 48 times [2022-03-19 08:12:36,184 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:12:36,184 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2076692909] [2022-03-19 08:12:36,184 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:12:36,184 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:12:36,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:12:36,566 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:12:36,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:12:36,568 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 25 proven. 600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:12:36,569 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:12:36,569 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2076692909] [2022-03-19 08:12:36,569 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2076692909] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:12:36,569 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [704500957] [2022-03-19 08:12:36,569 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-19 08:12:36,569 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:12:36,569 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:12:36,570 INFO L229 MonitoredProcess]: Starting monitored process 25 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:12:36,571 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-03-19 08:12:36,598 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-03-19 08:12:36,598 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 08:12:36,599 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 11 conjunts are in the unsatisfiable core [2022-03-19 08:12:36,601 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:12:36,788 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 72 proven. 1 refuted. 0 times theorem prover too weak. 552 trivial. 0 not checked. [2022-03-19 08:12:36,788 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:12:37,120 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 72 proven. 1 refuted. 0 times theorem prover too weak. 552 trivial. 0 not checked. [2022-03-19 08:12:37,121 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [704500957] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:12:37,121 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:12:37,121 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 4, 8] total 36 [2022-03-19 08:12:37,121 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:12:37,121 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1588523644] [2022-03-19 08:12:37,121 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1588523644] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:12:37,121 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:12:37,121 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [] total 28 [2022-03-19 08:12:37,121 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [713782050] [2022-03-19 08:12:37,121 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:12:37,121 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-03-19 08:12:37,122 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:12:37,122 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-03-19 08:12:37,122 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=1060, Unknown=0, NotChecked=0, Total=1260 [2022-03-19 08:12:37,122 INFO L87 Difference]: Start difference. First operand 63 states and 65 transitions. Second operand has 28 states, 28 states have (on average 2.0357142857142856) internal successors, (57), 27 states have internal predecessors, (57), 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) [2022-03-19 08:12:37,995 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:12:37,996 INFO L93 Difference]: Finished difference Result 72 states and 76 transitions. [2022-03-19 08:12:37,996 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-03-19 08:12:37,996 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 2.0357142857142856) internal successors, (57), 27 states have internal predecessors, (57), 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 61 [2022-03-19 08:12:37,996 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:12:37,997 INFO L225 Difference]: With dead ends: 72 [2022-03-19 08:12:37,997 INFO L226 Difference]: Without dead ends: 65 [2022-03-19 08:12:37,997 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 116 SyntacticMatches, 1 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 311 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=446, Invalid=3214, Unknown=0, NotChecked=0, Total=3660 [2022-03-19 08:12:37,998 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 33 mSDsluCounter, 92 mSDsCounter, 0 mSdLazyCounter, 1287 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 104 SdHoareTripleChecker+Invalid, 1338 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 1287 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-03-19 08:12:37,998 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 104 Invalid, 1338 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 1287 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-03-19 08:12:37,998 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2022-03-19 08:12:38,003 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2022-03-19 08:12:38,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 60 states have (on average 1.05) internal successors, (63), 60 states have internal predecessors, (63), 3 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) [2022-03-19 08:12:38,004 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 67 transitions. [2022-03-19 08:12:38,004 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 67 transitions. Word has length 61 [2022-03-19 08:12:38,004 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:12:38,004 INFO L478 AbstractCegarLoop]: Abstraction has 65 states and 67 transitions. [2022-03-19 08:12:38,004 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 2.0357142857142856) internal successors, (57), 27 states have internal predecessors, (57), 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) [2022-03-19 08:12:38,004 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 67 transitions. [2022-03-19 08:12:38,005 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2022-03-19 08:12:38,005 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:12:38,005 INFO L500 BasicCegarLoop]: trace histogram [26, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:12:38,023 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2022-03-19 08:12:38,219 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,25 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2022-03-19 08:12:38,219 INFO L403 AbstractCegarLoop]: === Iteration 28 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:12:38,220 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:12:38,220 INFO L85 PathProgramCache]: Analyzing trace with hash 48905618, now seen corresponding path program 49 times [2022-03-19 08:12:38,220 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:12:38,220 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [401509012] [2022-03-19 08:12:38,337 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-19 08:12:38,338 INFO L85 PathProgramCache]: Analyzing trace with hash 174458097, now seen corresponding path program 1 times [2022-03-19 08:12:38,338 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:12:38,338 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [726053140] [2022-03-19 08:12:38,338 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:12:38,338 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:12:38,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:12:38,343 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 08:12:38,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:12:38,349 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 08:12:38,350 INFO L85 PathProgramCache]: Analyzing trace with hash 48905618, now seen corresponding path program 50 times [2022-03-19 08:12:38,350 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:12:38,350 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [858538450] [2022-03-19 08:12:38,350 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:12:38,350 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:12:38,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:12:38,760 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:12:38,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:12:38,765 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 26 proven. 650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:12:38,765 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:12:38,765 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [858538450] [2022-03-19 08:12:38,765 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [858538450] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:12:38,765 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [691575133] [2022-03-19 08:12:38,765 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-19 08:12:38,765 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:12:38,766 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:12:38,766 INFO L229 MonitoredProcess]: Starting monitored process 26 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:12:38,767 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-03-19 08:12:38,827 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-19 08:12:38,827 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 08:12:38,828 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 54 conjunts are in the unsatisfiable core [2022-03-19 08:12:38,829 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:12:39,032 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 26 proven. 650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:12:39,032 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:12:42,273 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 26 proven. 650 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:12:42,273 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [691575133] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:12:42,274 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:12:42,274 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28, 29] total 57 [2022-03-19 08:12:42,274 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:12:42,274 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [401509012] [2022-03-19 08:12:42,274 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [401509012] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:12:42,274 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:12:42,274 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2022-03-19 08:12:42,274 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1574050388] [2022-03-19 08:12:42,274 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:12:42,274 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-03-19 08:12:42,274 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:12:42,275 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-03-19 08:12:42,275 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=867, Invalid=2325, Unknown=0, NotChecked=0, Total=3192 [2022-03-19 08:12:42,275 INFO L87 Difference]: Start difference. First operand 65 states and 67 transitions. Second operand has 29 states, 29 states have (on average 2.0344827586206895) internal successors, (59), 28 states have internal predecessors, (59), 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) [2022-03-19 08:12:43,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:12:43,123 INFO L93 Difference]: Finished difference Result 74 states and 78 transitions. [2022-03-19 08:12:43,124 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-03-19 08:12:43,124 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 2.0344827586206895) internal successors, (59), 28 states have internal predecessors, (59), 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 63 [2022-03-19 08:12:43,124 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:12:43,124 INFO L225 Difference]: With dead ends: 74 [2022-03-19 08:12:43,124 INFO L226 Difference]: Without dead ends: 67 [2022-03-19 08:12:43,125 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 99 SyntacticMatches, 2 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 408 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=1723, Invalid=5083, Unknown=0, NotChecked=0, Total=6806 [2022-03-19 08:12:43,125 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 34 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 1338 mSolverCounterSat, 53 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 64 SdHoareTripleChecker+Invalid, 1391 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 1338 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-03-19 08:12:43,126 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [34 Valid, 64 Invalid, 1391 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [53 Valid, 1338 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-03-19 08:12:43,126 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2022-03-19 08:12:43,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2022-03-19 08:12:43,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 62 states have (on average 1.0483870967741935) internal successors, (65), 62 states have internal predecessors, (65), 3 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) [2022-03-19 08:12:43,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 69 transitions. [2022-03-19 08:12:43,131 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 69 transitions. Word has length 63 [2022-03-19 08:12:43,132 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:12:43,132 INFO L478 AbstractCegarLoop]: Abstraction has 67 states and 69 transitions. [2022-03-19 08:12:43,132 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 2.0344827586206895) internal successors, (59), 28 states have internal predecessors, (59), 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) [2022-03-19 08:12:43,132 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 69 transitions. [2022-03-19 08:12:43,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2022-03-19 08:12:43,132 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:12:43,132 INFO L500 BasicCegarLoop]: trace histogram [27, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:12:43,149 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Ended with exit code 0 [2022-03-19 08:12:43,336 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable51,SelfDestructingSolverStorable52 [2022-03-19 08:12:43,336 INFO L403 AbstractCegarLoop]: === Iteration 29 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:12:43,336 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:12:43,336 INFO L85 PathProgramCache]: Analyzing trace with hash 1695595695, now seen corresponding path program 51 times [2022-03-19 08:12:43,336 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:12:43,336 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [876792055] [2022-03-19 08:12:43,455 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-19 08:12:43,455 INFO L85 PathProgramCache]: Analyzing trace with hash 233563441, now seen corresponding path program 1 times [2022-03-19 08:12:43,456 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:12:43,456 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [721823382] [2022-03-19 08:12:43,456 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:12:43,456 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:12:43,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:12:43,460 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 08:12:43,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:12:43,465 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 08:12:43,465 INFO L85 PathProgramCache]: Analyzing trace with hash 1695595695, now seen corresponding path program 52 times [2022-03-19 08:12:43,465 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:12:43,465 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [344284430] [2022-03-19 08:12:43,465 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:12:43,465 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:12:43,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:12:43,905 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:12:43,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:12:43,908 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 27 proven. 702 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:12:43,908 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:12:43,908 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [344284430] [2022-03-19 08:12:43,908 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [344284430] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:12:43,908 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [526952886] [2022-03-19 08:12:43,909 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-19 08:12:43,909 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:12:43,909 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:12:43,910 INFO L229 MonitoredProcess]: Starting monitored process 27 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:12:43,910 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-03-19 08:12:43,973 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-19 08:12:43,973 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 08:12:43,974 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 57 conjunts are in the unsatisfiable core [2022-03-19 08:12:43,975 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:12:44,218 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:12:44,218 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:12:47,284 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:12:47,284 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [526952886] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:12:47,284 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:12:47,284 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 60 [2022-03-19 08:12:47,284 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:12:47,285 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [876792055] [2022-03-19 08:12:47,285 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [876792055] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:12:47,285 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:12:47,285 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2022-03-19 08:12:47,285 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [346438204] [2022-03-19 08:12:47,285 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:12:47,285 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-03-19 08:12:47,285 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:12:47,285 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-03-19 08:12:47,286 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=956, Invalid=2584, Unknown=0, NotChecked=0, Total=3540 [2022-03-19 08:12:47,286 INFO L87 Difference]: Start difference. First operand 67 states and 69 transitions. Second operand has 30 states, 30 states have (on average 2.033333333333333) internal successors, (61), 29 states have internal predecessors, (61), 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) [2022-03-19 08:12:48,152 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:12:48,152 INFO L93 Difference]: Finished difference Result 76 states and 80 transitions. [2022-03-19 08:12:48,153 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-03-19 08:12:48,153 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 2.033333333333333) internal successors, (61), 29 states have internal predecessors, (61), 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 65 [2022-03-19 08:12:48,153 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:12:48,153 INFO L225 Difference]: With dead ends: 76 [2022-03-19 08:12:48,153 INFO L226 Difference]: Without dead ends: 69 [2022-03-19 08:12:48,154 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 101 SyntacticMatches, 2 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 413 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=1872, Invalid=5610, Unknown=0, NotChecked=0, Total=7482 [2022-03-19 08:12:48,155 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 35 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 1399 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 1454 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 1399 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-03-19 08:12:48,155 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [35 Valid, 29 Invalid, 1454 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 1399 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-03-19 08:12:48,155 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2022-03-19 08:12:48,160 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2022-03-19 08:12:48,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 64 states have (on average 1.046875) internal successors, (67), 64 states have internal predecessors, (67), 3 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) [2022-03-19 08:12:48,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 71 transitions. [2022-03-19 08:12:48,161 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 71 transitions. Word has length 65 [2022-03-19 08:12:48,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:12:48,161 INFO L478 AbstractCegarLoop]: Abstraction has 69 states and 71 transitions. [2022-03-19 08:12:48,161 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 2.033333333333333) internal successors, (61), 29 states have internal predecessors, (61), 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) [2022-03-19 08:12:48,161 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 71 transitions. [2022-03-19 08:12:48,161 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-03-19 08:12:48,161 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:12:48,161 INFO L500 BasicCegarLoop]: trace histogram [28, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:12:48,178 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Ended with exit code 0 [2022-03-19 08:12:48,378 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable53,SelfDestructingSolverStorable54 [2022-03-19 08:12:48,378 INFO L403 AbstractCegarLoop]: === Iteration 30 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:12:48,378 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:12:48,378 INFO L85 PathProgramCache]: Analyzing trace with hash -678172532, now seen corresponding path program 53 times [2022-03-19 08:12:48,378 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:12:48,378 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [212904103] [2022-03-19 08:12:48,491 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-19 08:12:48,492 INFO L85 PathProgramCache]: Analyzing trace with hash 292668785, now seen corresponding path program 1 times [2022-03-19 08:12:48,492 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:12:48,492 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [836231494] [2022-03-19 08:12:48,492 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:12:48,492 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:12:48,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:12:48,496 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 08:12:48,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:12:48,500 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 08:12:48,500 INFO L85 PathProgramCache]: Analyzing trace with hash -678172532, now seen corresponding path program 54 times [2022-03-19 08:12:48,500 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:12:48,500 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [765322813] [2022-03-19 08:12:48,500 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:12:48,500 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:12:48,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:12:48,954 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:12:48,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:12:48,969 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 28 proven. 756 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:12:48,969 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:12:48,969 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [765322813] [2022-03-19 08:12:48,970 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [765322813] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:12:48,970 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [189825759] [2022-03-19 08:12:48,970 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-19 08:12:48,970 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:12:48,970 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:12:48,971 INFO L229 MonitoredProcess]: Starting monitored process 28 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:12:48,987 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2022-03-19 08:12:49,016 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-03-19 08:12:49,017 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 08:12:49,017 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 9 conjunts are in the unsatisfiable core [2022-03-19 08:12:49,018 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:12:49,241 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 81 proven. 1 refuted. 0 times theorem prover too weak. 702 trivial. 0 not checked. [2022-03-19 08:12:49,242 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:12:49,550 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 81 proven. 1 refuted. 0 times theorem prover too weak. 702 trivial. 0 not checked. [2022-03-19 08:12:49,550 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [189825759] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:12:49,550 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:12:49,551 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 4, 7] total 38 [2022-03-19 08:12:49,551 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:12:49,551 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [212904103] [2022-03-19 08:12:49,551 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [212904103] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:12:49,551 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:12:49,551 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2022-03-19 08:12:49,551 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [604056458] [2022-03-19 08:12:49,551 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:12:49,551 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-03-19 08:12:49,551 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:12:49,552 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-03-19 08:12:49,552 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=211, Invalid=1195, Unknown=0, NotChecked=0, Total=1406 [2022-03-19 08:12:49,552 INFO L87 Difference]: Start difference. First operand 69 states and 71 transitions. Second operand has 31 states, 31 states have (on average 2.032258064516129) internal successors, (63), 30 states have internal predecessors, (63), 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) [2022-03-19 08:12:50,570 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:12:50,570 INFO L93 Difference]: Finished difference Result 78 states and 82 transitions. [2022-03-19 08:12:50,570 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-03-19 08:12:50,571 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 2.032258064516129) internal successors, (63), 30 states have internal predecessors, (63), 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 67 [2022-03-19 08:12:50,571 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:12:50,571 INFO L225 Difference]: With dead ends: 78 [2022-03-19 08:12:50,571 INFO L226 Difference]: Without dead ends: 71 [2022-03-19 08:12:50,572 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 194 GetRequests, 129 SyntacticMatches, 1 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 392 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=483, Invalid=3807, Unknown=0, NotChecked=0, Total=4290 [2022-03-19 08:12:50,572 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 36 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 1560 mSolverCounterSat, 57 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 74 SdHoareTripleChecker+Invalid, 1617 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 57 IncrementalHoareTripleChecker+Valid, 1560 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-03-19 08:12:50,573 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [36 Valid, 74 Invalid, 1617 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [57 Valid, 1560 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-03-19 08:12:50,573 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2022-03-19 08:12:50,578 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 71. [2022-03-19 08:12:50,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 66 states have (on average 1.0454545454545454) internal successors, (69), 66 states have internal predecessors, (69), 3 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) [2022-03-19 08:12:50,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 73 transitions. [2022-03-19 08:12:50,579 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 73 transitions. Word has length 67 [2022-03-19 08:12:50,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:12:50,579 INFO L478 AbstractCegarLoop]: Abstraction has 71 states and 73 transitions. [2022-03-19 08:12:50,579 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 2.032258064516129) internal successors, (63), 30 states have internal predecessors, (63), 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) [2022-03-19 08:12:50,579 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 73 transitions. [2022-03-19 08:12:50,580 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2022-03-19 08:12:50,580 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:12:50,580 INFO L500 BasicCegarLoop]: trace histogram [29, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:12:50,597 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2022-03-19 08:12:50,797 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable55,28 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable56 [2022-03-19 08:12:50,797 INFO L403 AbstractCegarLoop]: === Iteration 31 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:12:50,797 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:12:50,797 INFO L85 PathProgramCache]: Analyzing trace with hash -1241804503, now seen corresponding path program 55 times [2022-03-19 08:12:50,797 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:12:50,797 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [459998310] [2022-03-19 08:12:50,908 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-19 08:12:50,908 INFO L85 PathProgramCache]: Analyzing trace with hash 351774129, now seen corresponding path program 1 times [2022-03-19 08:12:50,908 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:12:50,908 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1546564609] [2022-03-19 08:12:50,908 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:12:50,909 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:12:50,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:12:50,913 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 08:12:50,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:12:50,918 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 08:12:50,918 INFO L85 PathProgramCache]: Analyzing trace with hash -1241804503, now seen corresponding path program 56 times [2022-03-19 08:12:50,918 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:12:50,918 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1360278031] [2022-03-19 08:12:50,918 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:12:50,918 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:12:50,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:12:51,432 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:12:51,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:12:51,435 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 29 proven. 812 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:12:51,435 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:12:51,435 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1360278031] [2022-03-19 08:12:51,435 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1360278031] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:12:51,435 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [379865847] [2022-03-19 08:12:51,436 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-19 08:12:51,436 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:12:51,436 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:12:51,445 INFO L229 MonitoredProcess]: Starting monitored process 29 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:12:51,447 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2022-03-19 08:12:51,504 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-19 08:12:51,505 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 08:12:51,506 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 60 conjunts are in the unsatisfiable core [2022-03-19 08:12:51,507 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:12:51,755 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 29 proven. 812 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:12:51,756 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:12:56,447 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 29 proven. 812 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:12:56,448 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [379865847] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:12:56,448 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:12:56,448 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 31, 32] total 63 [2022-03-19 08:12:56,448 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:12:56,448 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [459998310] [2022-03-19 08:12:56,448 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [459998310] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:12:56,448 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:12:56,448 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2022-03-19 08:12:56,448 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [561741063] [2022-03-19 08:12:56,448 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:12:56,449 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-03-19 08:12:56,449 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:12:56,449 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-03-19 08:12:56,449 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1053, Invalid=2853, Unknown=0, NotChecked=0, Total=3906 [2022-03-19 08:12:56,450 INFO L87 Difference]: Start difference. First operand 71 states and 73 transitions. Second operand has 32 states, 32 states have (on average 2.03125) internal successors, (65), 31 states have internal predecessors, (65), 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) [2022-03-19 08:12:57,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:12:57,453 INFO L93 Difference]: Finished difference Result 80 states and 84 transitions. [2022-03-19 08:12:57,453 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2022-03-19 08:12:57,453 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 2.03125) internal successors, (65), 31 states have internal predecessors, (65), 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 69 [2022-03-19 08:12:57,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:12:57,454 INFO L225 Difference]: With dead ends: 80 [2022-03-19 08:12:57,454 INFO L226 Difference]: Without dead ends: 73 [2022-03-19 08:12:57,455 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 200 GetRequests, 108 SyntacticMatches, 2 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 498 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=2095, Invalid=6277, Unknown=0, NotChecked=0, Total=8372 [2022-03-19 08:12:57,455 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 37 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 1635 mSolverCounterSat, 59 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 1694 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 59 IncrementalHoareTripleChecker+Valid, 1635 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-03-19 08:12:57,455 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 44 Invalid, 1694 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [59 Valid, 1635 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-03-19 08:12:57,456 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2022-03-19 08:12:57,461 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 73. [2022-03-19 08:12:57,462 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 68 states have (on average 1.0441176470588236) internal successors, (71), 68 states have internal predecessors, (71), 3 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) [2022-03-19 08:12:57,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 75 transitions. [2022-03-19 08:12:57,462 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 75 transitions. Word has length 69 [2022-03-19 08:12:57,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:12:57,462 INFO L478 AbstractCegarLoop]: Abstraction has 73 states and 75 transitions. [2022-03-19 08:12:57,462 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 2.03125) internal successors, (65), 31 states have internal predecessors, (65), 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) [2022-03-19 08:12:57,462 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 75 transitions. [2022-03-19 08:12:57,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2022-03-19 08:12:57,463 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:12:57,463 INFO L500 BasicCegarLoop]: trace histogram [30, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:12:57,480 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Ended with exit code 0 [2022-03-19 08:12:57,675 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable57,SelfDestructingSolverStorable58,29 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:12:57,675 INFO L403 AbstractCegarLoop]: === Iteration 32 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:12:57,676 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:12:57,676 INFO L85 PathProgramCache]: Analyzing trace with hash -1726249338, now seen corresponding path program 57 times [2022-03-19 08:12:57,676 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:12:57,676 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1157519096] [2022-03-19 08:12:57,811 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-19 08:12:57,812 INFO L85 PathProgramCache]: Analyzing trace with hash 410879473, now seen corresponding path program 1 times [2022-03-19 08:12:57,812 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:12:57,812 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [743150698] [2022-03-19 08:12:57,812 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:12:57,812 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:12:57,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:12:57,815 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 08:12:57,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:12:57,821 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 08:12:57,821 INFO L85 PathProgramCache]: Analyzing trace with hash -1726249338, now seen corresponding path program 58 times [2022-03-19 08:12:57,821 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:12:57,821 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1873032433] [2022-03-19 08:12:57,821 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:12:57,822 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:12:57,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:12:58,353 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:12:58,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:12:58,357 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 30 proven. 870 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:12:58,357 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:12:58,357 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1873032433] [2022-03-19 08:12:58,357 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1873032433] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:12:58,357 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [972605079] [2022-03-19 08:12:58,357 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-19 08:12:58,358 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:12:58,358 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:12:58,359 INFO L229 MonitoredProcess]: Starting monitored process 30 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:12:58,360 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2022-03-19 08:12:58,441 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-19 08:12:58,441 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 08:12:58,442 INFO L263 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 63 conjunts are in the unsatisfiable core [2022-03-19 08:12:58,443 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:12:58,684 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:12:58,684 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:13:03,452 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:13:03,453 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [972605079] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:13:03,453 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:13:03,453 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 66 [2022-03-19 08:13:03,453 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:13:03,453 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1157519096] [2022-03-19 08:13:03,453 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1157519096] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:13:03,453 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:13:03,453 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2022-03-19 08:13:03,453 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2097938209] [2022-03-19 08:13:03,453 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:13:03,453 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-03-19 08:13:03,454 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:13:03,454 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-03-19 08:13:03,454 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1151, Invalid=3139, Unknown=0, NotChecked=0, Total=4290 [2022-03-19 08:13:03,454 INFO L87 Difference]: Start difference. First operand 73 states and 75 transitions. Second operand has 33 states, 33 states have (on average 2.0303030303030303) internal successors, (67), 32 states have internal predecessors, (67), 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) [2022-03-19 08:13:04,599 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:13:04,599 INFO L93 Difference]: Finished difference Result 82 states and 86 transitions. [2022-03-19 08:13:04,599 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-03-19 08:13:04,600 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 2.0303030303030303) internal successors, (67), 32 states have internal predecessors, (67), 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 71 [2022-03-19 08:13:04,600 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:13:04,600 INFO L225 Difference]: With dead ends: 82 [2022-03-19 08:13:04,600 INFO L226 Difference]: Without dead ends: 75 [2022-03-19 08:13:04,601 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 206 GetRequests, 110 SyntacticMatches, 2 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 503 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=2259, Invalid=6861, Unknown=0, NotChecked=0, Total=9120 [2022-03-19 08:13:04,602 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 38 mSDsluCounter, 122 mSDsCounter, 0 mSdLazyCounter, 1858 mSolverCounterSat, 61 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 134 SdHoareTripleChecker+Invalid, 1919 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 61 IncrementalHoareTripleChecker+Valid, 1858 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-03-19 08:13:04,602 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 134 Invalid, 1919 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [61 Valid, 1858 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-03-19 08:13:04,602 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2022-03-19 08:13:04,607 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2022-03-19 08:13:04,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 70 states have (on average 1.042857142857143) internal successors, (73), 70 states have internal predecessors, (73), 3 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) [2022-03-19 08:13:04,608 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 77 transitions. [2022-03-19 08:13:04,608 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 77 transitions. Word has length 71 [2022-03-19 08:13:04,608 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:13:04,608 INFO L478 AbstractCegarLoop]: Abstraction has 75 states and 77 transitions. [2022-03-19 08:13:04,608 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 2.0303030303030303) internal successors, (67), 32 states have internal predecessors, (67), 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) [2022-03-19 08:13:04,608 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 77 transitions. [2022-03-19 08:13:04,609 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-03-19 08:13:04,609 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:13:04,609 INFO L500 BasicCegarLoop]: trace histogram [31, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:13:04,626 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Ended with exit code 0 [2022-03-19 08:13:04,809 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable60,30 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable59 [2022-03-19 08:13:04,809 INFO L403 AbstractCegarLoop]: === Iteration 33 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:13:04,810 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:13:04,810 INFO L85 PathProgramCache]: Analyzing trace with hash 873699491, now seen corresponding path program 59 times [2022-03-19 08:13:04,810 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:13:04,810 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [450955080] [2022-03-19 08:13:04,922 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-19 08:13:04,922 INFO L85 PathProgramCache]: Analyzing trace with hash 469984817, now seen corresponding path program 1 times [2022-03-19 08:13:04,923 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:13:04,923 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [623163322] [2022-03-19 08:13:04,923 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:13:04,923 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:13:04,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:13:04,937 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 08:13:04,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:13:04,940 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 08:13:04,941 INFO L85 PathProgramCache]: Analyzing trace with hash 873699491, now seen corresponding path program 60 times [2022-03-19 08:13:04,941 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:13:04,941 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1419831208] [2022-03-19 08:13:04,941 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:13:04,941 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:13:04,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:13:05,464 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:13:05,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:13:05,476 INFO L134 CoverageAnalysis]: Checked inductivity of 961 backedges. 31 proven. 930 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:13:05,476 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:13:05,476 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1419831208] [2022-03-19 08:13:05,476 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1419831208] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:13:05,476 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [655241300] [2022-03-19 08:13:05,476 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-19 08:13:05,476 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:13:05,476 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:13:05,477 INFO L229 MonitoredProcess]: Starting monitored process 31 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:13:05,478 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2022-03-19 08:13:05,511 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-03-19 08:13:05,512 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 08:13:05,512 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 11 conjunts are in the unsatisfiable core [2022-03-19 08:13:05,513 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:13:05,828 INFO L134 CoverageAnalysis]: Checked inductivity of 961 backedges. 90 proven. 1 refuted. 0 times theorem prover too weak. 870 trivial. 0 not checked. [2022-03-19 08:13:05,828 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:13:06,414 INFO L134 CoverageAnalysis]: Checked inductivity of 961 backedges. 90 proven. 1 refuted. 0 times theorem prover too weak. 870 trivial. 0 not checked. [2022-03-19 08:13:06,414 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [655241300] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:13:06,414 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:13:06,415 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 4, 8] total 42 [2022-03-19 08:13:06,415 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:13:06,415 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [450955080] [2022-03-19 08:13:06,415 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [450955080] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:13:06,415 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:13:06,415 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [34] imperfect sequences [] total 34 [2022-03-19 08:13:06,415 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1120727755] [2022-03-19 08:13:06,415 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:13:06,415 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2022-03-19 08:13:06,415 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:13:06,416 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2022-03-19 08:13:06,416 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=242, Invalid=1480, Unknown=0, NotChecked=0, Total=1722 [2022-03-19 08:13:06,417 INFO L87 Difference]: Start difference. First operand 75 states and 77 transitions. Second operand has 34 states, 34 states have (on average 2.0294117647058822) internal successors, (69), 33 states have internal predecessors, (69), 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) [2022-03-19 08:13:07,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:13:07,789 INFO L93 Difference]: Finished difference Result 84 states and 88 transitions. [2022-03-19 08:13:07,790 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-03-19 08:13:07,790 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 2.0294117647058822) internal successors, (69), 33 states have internal predecessors, (69), 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 73 [2022-03-19 08:13:07,790 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:13:07,790 INFO L225 Difference]: With dead ends: 84 [2022-03-19 08:13:07,790 INFO L226 Difference]: Without dead ends: 77 [2022-03-19 08:13:07,791 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 212 GetRequests, 140 SyntacticMatches, 1 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 476 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=548, Invalid=4708, Unknown=0, NotChecked=0, Total=5256 [2022-03-19 08:13:07,791 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 39 mSDsluCounter, 157 mSDsCounter, 0 mSdLazyCounter, 2019 mSolverCounterSat, 63 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 169 SdHoareTripleChecker+Invalid, 2082 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 63 IncrementalHoareTripleChecker+Valid, 2019 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-03-19 08:13:07,791 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [39 Valid, 169 Invalid, 2082 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [63 Valid, 2019 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-03-19 08:13:07,791 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2022-03-19 08:13:07,797 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 77. [2022-03-19 08:13:07,797 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 72 states have (on average 1.0416666666666667) internal successors, (75), 72 states have internal predecessors, (75), 3 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) [2022-03-19 08:13:07,798 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 79 transitions. [2022-03-19 08:13:07,798 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 79 transitions. Word has length 73 [2022-03-19 08:13:07,798 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:13:07,798 INFO L478 AbstractCegarLoop]: Abstraction has 77 states and 79 transitions. [2022-03-19 08:13:07,798 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 2.0294117647058822) internal successors, (69), 33 states have internal predecessors, (69), 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) [2022-03-19 08:13:07,798 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 79 transitions. [2022-03-19 08:13:07,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2022-03-19 08:13:07,798 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:13:07,798 INFO L500 BasicCegarLoop]: trace histogram [32, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:13:07,823 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2022-03-19 08:13:08,011 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable61,SelfDestructingSolverStorable62 [2022-03-19 08:13:08,012 INFO L403 AbstractCegarLoop]: === Iteration 34 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:13:08,012 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:13:08,012 INFO L85 PathProgramCache]: Analyzing trace with hash -246442112, now seen corresponding path program 61 times [2022-03-19 08:13:08,012 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:13:08,012 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1725092713] [2022-03-19 08:13:08,153 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-19 08:13:08,154 INFO L85 PathProgramCache]: Analyzing trace with hash 529090161, now seen corresponding path program 1 times [2022-03-19 08:13:08,154 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:13:08,154 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1175341969] [2022-03-19 08:13:08,154 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:13:08,154 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:13:08,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:13:08,158 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 08:13:08,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:13:08,161 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 08:13:08,161 INFO L85 PathProgramCache]: Analyzing trace with hash -246442112, now seen corresponding path program 62 times [2022-03-19 08:13:08,161 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:13:08,161 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [687790843] [2022-03-19 08:13:08,161 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:13:08,161 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:13:08,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:13:08,722 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:13:08,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:13:08,736 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 32 proven. 992 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:13:08,736 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:13:08,737 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [687790843] [2022-03-19 08:13:08,737 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [687790843] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:13:08,737 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2142963174] [2022-03-19 08:13:08,737 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-19 08:13:08,737 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:13:08,737 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:13:08,738 INFO L229 MonitoredProcess]: Starting monitored process 32 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:13:08,739 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2022-03-19 08:13:08,820 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-19 08:13:08,820 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 08:13:08,821 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 66 conjunts are in the unsatisfiable core [2022-03-19 08:13:08,823 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:13:09,104 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 32 proven. 992 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:13:09,105 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:13:16,210 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 32 proven. 992 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:13:16,211 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2142963174] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:13:16,211 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:13:16,211 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 34, 35] total 69 [2022-03-19 08:13:16,211 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:13:16,211 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1725092713] [2022-03-19 08:13:16,211 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1725092713] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:13:16,211 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:13:16,211 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2022-03-19 08:13:16,211 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [564322881] [2022-03-19 08:13:16,211 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:13:16,212 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-03-19 08:13:16,212 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:13:16,212 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-03-19 08:13:16,212 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1257, Invalid=3435, Unknown=0, NotChecked=0, Total=4692 [2022-03-19 08:13:16,213 INFO L87 Difference]: Start difference. First operand 77 states and 79 transitions. Second operand has 35 states, 35 states have (on average 2.0285714285714285) internal successors, (71), 34 states have internal predecessors, (71), 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) [2022-03-19 08:13:17,484 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:13:17,484 INFO L93 Difference]: Finished difference Result 86 states and 90 transitions. [2022-03-19 08:13:17,484 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-03-19 08:13:17,484 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 2.0285714285714285) internal successors, (71), 34 states have internal predecessors, (71), 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 75 [2022-03-19 08:13:17,485 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:13:17,485 INFO L225 Difference]: With dead ends: 86 [2022-03-19 08:13:17,485 INFO L226 Difference]: Without dead ends: 79 [2022-03-19 08:13:17,485 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 117 SyntacticMatches, 2 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 597 ImplicationChecksByTransitivity, 7.6s TimeCoverageRelationStatistics Valid=2503, Invalid=7597, Unknown=0, NotChecked=0, Total=10100 [2022-03-19 08:13:17,486 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 40 mSDsluCounter, 147 mSDsCounter, 0 mSdLazyCounter, 2130 mSolverCounterSat, 65 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 159 SdHoareTripleChecker+Invalid, 2195 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 65 IncrementalHoareTripleChecker+Valid, 2130 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-03-19 08:13:17,486 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 159 Invalid, 2195 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [65 Valid, 2130 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-03-19 08:13:17,486 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2022-03-19 08:13:17,492 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2022-03-19 08:13:17,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 74 states have (on average 1.0405405405405406) internal successors, (77), 74 states have internal predecessors, (77), 3 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) [2022-03-19 08:13:17,492 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 81 transitions. [2022-03-19 08:13:17,492 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 81 transitions. Word has length 75 [2022-03-19 08:13:17,493 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:13:17,493 INFO L478 AbstractCegarLoop]: Abstraction has 79 states and 81 transitions. [2022-03-19 08:13:17,493 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 2.0285714285714285) internal successors, (71), 34 states have internal predecessors, (71), 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) [2022-03-19 08:13:17,493 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 81 transitions. [2022-03-19 08:13:17,493 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2022-03-19 08:13:17,493 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:13:17,493 INFO L500 BasicCegarLoop]: trace histogram [33, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:13:17,513 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Ended with exit code 0 [2022-03-19 08:13:17,694 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable63,SelfDestructingSolverStorable64,32 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:13:17,694 INFO L403 AbstractCegarLoop]: === Iteration 35 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:13:17,694 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:13:17,694 INFO L85 PathProgramCache]: Analyzing trace with hash 1334268701, now seen corresponding path program 63 times [2022-03-19 08:13:17,694 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:13:17,694 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1065942291] [2022-03-19 08:13:17,805 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-19 08:13:17,806 INFO L85 PathProgramCache]: Analyzing trace with hash 588195505, now seen corresponding path program 1 times [2022-03-19 08:13:17,806 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:13:17,806 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [887949859] [2022-03-19 08:13:17,806 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:13:17,806 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:13:17,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:13:17,809 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 08:13:17,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:13:17,816 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 08:13:17,816 INFO L85 PathProgramCache]: Analyzing trace with hash 1334268701, now seen corresponding path program 64 times [2022-03-19 08:13:17,816 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:13:17,816 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [776680463] [2022-03-19 08:13:17,816 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:13:17,816 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:13:17,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:13:18,402 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:13:18,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:13:18,420 INFO L134 CoverageAnalysis]: Checked inductivity of 1089 backedges. 33 proven. 1056 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:13:18,420 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:13:18,420 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [776680463] [2022-03-19 08:13:18,421 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [776680463] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:13:18,421 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1120738456] [2022-03-19 08:13:18,421 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-19 08:13:18,421 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:13:18,421 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:13:18,422 INFO L229 MonitoredProcess]: Starting monitored process 33 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:13:18,423 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2022-03-19 08:13:18,484 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-19 08:13:18,484 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 08:13:18,486 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 68 conjunts are in the unsatisfiable core [2022-03-19 08:13:18,487 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:13:18,727 INFO L134 CoverageAnalysis]: Checked inductivity of 1089 backedges. 33 proven. 1056 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:13:18,728 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:13:28,576 INFO L134 CoverageAnalysis]: Checked inductivity of 1089 backedges. 33 proven. 1056 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:13:28,577 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1120738456] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:13:28,577 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:13:28,577 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 35, 36] total 71 [2022-03-19 08:13:28,577 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:13:28,577 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1065942291] [2022-03-19 08:13:28,577 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1065942291] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:13:28,577 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:13:28,577 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [36] imperfect sequences [] total 36 [2022-03-19 08:13:28,577 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1250486497] [2022-03-19 08:13:28,577 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:13:28,578 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-03-19 08:13:28,578 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:13:28,578 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-03-19 08:13:28,578 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1329, Invalid=3641, Unknown=0, NotChecked=0, Total=4970 [2022-03-19 08:13:28,579 INFO L87 Difference]: Start difference. First operand 79 states and 81 transitions. Second operand has 36 states, 36 states have (on average 2.0277777777777777) internal successors, (73), 35 states have internal predecessors, (73), 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) [2022-03-19 08:13:29,956 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:13:29,956 INFO L93 Difference]: Finished difference Result 88 states and 92 transitions. [2022-03-19 08:13:29,956 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-03-19 08:13:29,957 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 2.0277777777777777) internal successors, (73), 35 states have internal predecessors, (73), 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 77 [2022-03-19 08:13:29,957 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:13:29,957 INFO L225 Difference]: With dead ends: 88 [2022-03-19 08:13:29,957 INFO L226 Difference]: Without dead ends: 81 [2022-03-19 08:13:29,958 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 224 GetRequests, 120 SyntacticMatches, 2 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 632 ImplicationChecksByTransitivity, 10.1s TimeCoverageRelationStatistics Valid=2647, Invalid=8065, Unknown=0, NotChecked=0, Total=10712 [2022-03-19 08:13:29,958 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 41 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 2179 mSolverCounterSat, 67 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 94 SdHoareTripleChecker+Invalid, 2246 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 67 IncrementalHoareTripleChecker+Valid, 2179 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-03-19 08:13:29,958 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [41 Valid, 94 Invalid, 2246 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [67 Valid, 2179 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-03-19 08:13:29,958 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2022-03-19 08:13:29,964 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 81. [2022-03-19 08:13:29,965 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 76 states have (on average 1.0394736842105263) internal successors, (79), 76 states have internal predecessors, (79), 3 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) [2022-03-19 08:13:29,965 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 83 transitions. [2022-03-19 08:13:29,965 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 83 transitions. Word has length 77 [2022-03-19 08:13:29,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:13:29,965 INFO L478 AbstractCegarLoop]: Abstraction has 81 states and 83 transitions. [2022-03-19 08:13:29,965 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 2.0277777777777777) internal successors, (73), 35 states have internal predecessors, (73), 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) [2022-03-19 08:13:29,965 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 83 transitions. [2022-03-19 08:13:29,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-03-19 08:13:29,966 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:13:29,966 INFO L500 BasicCegarLoop]: trace histogram [34, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:13:29,983 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Ended with exit code 0 [2022-03-19 08:13:30,176 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable65,SelfDestructingSolverStorable66,33 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:13:30,176 INFO L403 AbstractCegarLoop]: === Iteration 36 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:13:30,177 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:13:30,177 INFO L85 PathProgramCache]: Analyzing trace with hash -21062790, now seen corresponding path program 65 times [2022-03-19 08:13:30,177 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:13:30,177 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [204343986] [2022-03-19 08:13:30,327 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-19 08:13:30,328 INFO L85 PathProgramCache]: Analyzing trace with hash 647300849, now seen corresponding path program 1 times [2022-03-19 08:13:30,328 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:13:30,328 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [785247583] [2022-03-19 08:13:30,328 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:13:30,328 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:13:30,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:13:30,332 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 08:13:30,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:13:30,335 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 08:13:30,335 INFO L85 PathProgramCache]: Analyzing trace with hash -21062790, now seen corresponding path program 66 times [2022-03-19 08:13:30,335 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:13:30,335 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [644584767] [2022-03-19 08:13:30,335 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:13:30,335 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:13:30,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:13:31,092 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:13:31,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:13:31,101 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 34 proven. 1122 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:13:31,101 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:13:31,101 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [644584767] [2022-03-19 08:13:31,101 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [644584767] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:13:31,101 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1751021712] [2022-03-19 08:13:31,101 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-19 08:13:31,102 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:13:31,102 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:13:31,103 INFO L229 MonitoredProcess]: Starting monitored process 34 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:13:31,104 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2022-03-19 08:13:31,235 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-03-19 08:13:31,235 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 08:13:31,236 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 11 conjunts are in the unsatisfiable core [2022-03-19 08:13:31,237 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:13:32,021 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 99 proven. 1 refuted. 0 times theorem prover too weak. 1056 trivial. 0 not checked. [2022-03-19 08:13:32,021 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:13:32,912 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 99 proven. 1 refuted. 0 times theorem prover too weak. 1056 trivial. 0 not checked. [2022-03-19 08:13:32,912 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1751021712] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:13:32,912 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:13:32,912 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 4, 8] total 45 [2022-03-19 08:13:32,913 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:13:32,913 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [204343986] [2022-03-19 08:13:32,913 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [204343986] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:13:32,913 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:13:32,913 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [37] imperfect sequences [] total 37 [2022-03-19 08:13:32,913 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [490134032] [2022-03-19 08:13:32,913 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:13:32,913 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2022-03-19 08:13:32,913 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:13:32,913 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2022-03-19 08:13:32,914 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=263, Invalid=1717, Unknown=0, NotChecked=0, Total=1980 [2022-03-19 08:13:32,914 INFO L87 Difference]: Start difference. First operand 81 states and 83 transitions. Second operand has 37 states, 37 states have (on average 2.027027027027027) internal successors, (75), 36 states have internal predecessors, (75), 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) [2022-03-19 08:13:34,613 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:13:34,613 INFO L93 Difference]: Finished difference Result 90 states and 94 transitions. [2022-03-19 08:13:34,614 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-03-19 08:13:34,614 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 2.027027027027027) internal successors, (75), 36 states have internal predecessors, (75), 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 79 [2022-03-19 08:13:34,614 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:13:34,614 INFO L225 Difference]: With dead ends: 90 [2022-03-19 08:13:34,614 INFO L226 Difference]: Without dead ends: 83 [2022-03-19 08:13:34,615 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 230 GetRequests, 152 SyntacticMatches, 1 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 572 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=599, Invalid=5563, Unknown=0, NotChecked=0, Total=6162 [2022-03-19 08:13:34,615 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 42 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 2280 mSolverCounterSat, 69 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 69 SdHoareTripleChecker+Invalid, 2349 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 69 IncrementalHoareTripleChecker+Valid, 2280 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-03-19 08:13:34,616 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [42 Valid, 69 Invalid, 2349 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [69 Valid, 2280 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-03-19 08:13:34,616 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2022-03-19 08:13:34,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 83. [2022-03-19 08:13:34,622 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 78 states have (on average 1.0384615384615385) internal successors, (81), 78 states have internal predecessors, (81), 3 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) [2022-03-19 08:13:34,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 85 transitions. [2022-03-19 08:13:34,623 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 85 transitions. Word has length 79 [2022-03-19 08:13:34,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:13:34,623 INFO L478 AbstractCegarLoop]: Abstraction has 83 states and 85 transitions. [2022-03-19 08:13:34,623 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 2.027027027027027) internal successors, (75), 36 states have internal predecessors, (75), 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) [2022-03-19 08:13:34,623 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 85 transitions. [2022-03-19 08:13:34,623 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2022-03-19 08:13:34,623 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:13:34,623 INFO L500 BasicCegarLoop]: trace histogram [35, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:13:34,627 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2022-03-19 08:13:34,824 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable67,SelfDestructingSolverStorable68 [2022-03-19 08:13:34,824 INFO L403 AbstractCegarLoop]: === Iteration 37 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:13:34,824 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:13:34,824 INFO L85 PathProgramCache]: Analyzing trace with hash -1119534953, now seen corresponding path program 67 times [2022-03-19 08:13:34,824 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:13:34,824 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1059124398] [2022-03-19 08:13:34,953 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-19 08:13:34,953 INFO L85 PathProgramCache]: Analyzing trace with hash 706406193, now seen corresponding path program 1 times [2022-03-19 08:13:34,953 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:13:34,953 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [535044395] [2022-03-19 08:13:34,954 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:13:34,954 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:13:34,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:13:34,957 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 08:13:34,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:13:34,960 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 08:13:34,960 INFO L85 PathProgramCache]: Analyzing trace with hash -1119534953, now seen corresponding path program 68 times [2022-03-19 08:13:34,960 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:13:34,960 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [531554624] [2022-03-19 08:13:34,960 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:13:34,960 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:13:34,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:13:35,611 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:13:35,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:13:35,614 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 35 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:13:35,614 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:13:35,614 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [531554624] [2022-03-19 08:13:35,614 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [531554624] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:13:35,614 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [175375780] [2022-03-19 08:13:35,614 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-19 08:13:35,614 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:13:35,615 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:13:35,616 INFO L229 MonitoredProcess]: Starting monitored process 35 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:13:35,616 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2022-03-19 08:13:35,713 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-19 08:13:35,713 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 08:13:35,715 INFO L263 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 72 conjunts are in the unsatisfiable core [2022-03-19 08:13:35,716 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:13:35,964 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 35 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:13:35,964 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:13:50,806 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 35 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:13:50,806 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [175375780] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:13:50,807 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:13:50,807 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 37, 38] total 75 [2022-03-19 08:13:50,807 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:13:50,807 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1059124398] [2022-03-19 08:13:50,807 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1059124398] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:13:50,807 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:13:50,807 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [38] imperfect sequences [] total 38 [2022-03-19 08:13:50,811 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2060983648] [2022-03-19 08:13:50,811 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:13:50,811 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-03-19 08:13:50,811 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:13:50,812 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-03-19 08:13:50,812 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1479, Invalid=4071, Unknown=0, NotChecked=0, Total=5550 [2022-03-19 08:13:50,812 INFO L87 Difference]: Start difference. First operand 83 states and 85 transitions. Second operand has 38 states, 38 states have (on average 2.026315789473684) internal successors, (77), 37 states have internal predecessors, (77), 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) [2022-03-19 08:13:52,373 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:13:52,373 INFO L93 Difference]: Finished difference Result 92 states and 96 transitions. [2022-03-19 08:13:52,373 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-03-19 08:13:52,373 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 2.026315789473684) internal successors, (77), 37 states have internal predecessors, (77), 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 81 [2022-03-19 08:13:52,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:13:52,374 INFO L225 Difference]: With dead ends: 92 [2022-03-19 08:13:52,374 INFO L226 Difference]: Without dead ends: 85 [2022-03-19 08:13:52,375 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 236 GetRequests, 126 SyntacticMatches, 2 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 705 ImplicationChecksByTransitivity, 14.8s TimeCoverageRelationStatistics Valid=2947, Invalid=9043, Unknown=0, NotChecked=0, Total=11990 [2022-03-19 08:13:52,376 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 43 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 2367 mSolverCounterSat, 71 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 2438 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 71 IncrementalHoareTripleChecker+Valid, 2367 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-03-19 08:13:52,376 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [43 Valid, 29 Invalid, 2438 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [71 Valid, 2367 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-03-19 08:13:52,376 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2022-03-19 08:13:52,383 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 85. [2022-03-19 08:13:52,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 80 states have (on average 1.0375) internal successors, (83), 80 states have internal predecessors, (83), 3 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) [2022-03-19 08:13:52,383 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 87 transitions. [2022-03-19 08:13:52,383 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 87 transitions. Word has length 81 [2022-03-19 08:13:52,384 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:13:52,384 INFO L478 AbstractCegarLoop]: Abstraction has 85 states and 87 transitions. [2022-03-19 08:13:52,384 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 2.026315789473684) internal successors, (77), 37 states have internal predecessors, (77), 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) [2022-03-19 08:13:52,384 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 87 transitions. [2022-03-19 08:13:52,384 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2022-03-19 08:13:52,384 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:13:52,384 INFO L500 BasicCegarLoop]: trace histogram [36, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:13:52,402 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2022-03-19 08:13:52,584 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable70,35 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable69 [2022-03-19 08:13:52,585 INFO L403 AbstractCegarLoop]: === Iteration 38 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:13:52,585 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:13:52,585 INFO L85 PathProgramCache]: Analyzing trace with hash -189328780, now seen corresponding path program 69 times [2022-03-19 08:13:52,585 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:13:52,585 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1265064941] [2022-03-19 08:13:52,706 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-19 08:13:52,706 INFO L85 PathProgramCache]: Analyzing trace with hash 765511537, now seen corresponding path program 1 times [2022-03-19 08:13:52,706 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:13:52,706 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1719590713] [2022-03-19 08:13:52,706 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:13:52,706 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:13:52,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:13:52,710 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 08:13:52,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:13:52,713 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 08:13:52,714 INFO L85 PathProgramCache]: Analyzing trace with hash -189328780, now seen corresponding path program 70 times [2022-03-19 08:13:52,714 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:13:52,714 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [184080374] [2022-03-19 08:13:52,714 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:13:52,714 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:13:52,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:13:53,466 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:13:53,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:13:53,469 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 36 proven. 1260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:13:53,469 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:13:53,469 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [184080374] [2022-03-19 08:13:53,469 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [184080374] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:13:53,469 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [778623182] [2022-03-19 08:13:53,470 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-19 08:13:53,470 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:13:53,470 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:13:53,483 INFO L229 MonitoredProcess]: Starting monitored process 36 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:13:53,485 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2022-03-19 08:13:53,561 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-19 08:13:53,562 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 08:13:53,563 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 74 conjunts are in the unsatisfiable core [2022-03-19 08:13:53,565 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:13:53,830 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 36 proven. 1260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:13:53,831 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:14:15,044 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 36 proven. 1260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:14:15,045 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [778623182] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:14:15,045 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:14:15,045 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 38, 39] total 77 [2022-03-19 08:14:15,045 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:14:15,045 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1265064941] [2022-03-19 08:14:15,045 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1265064941] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:14:15,045 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:14:15,045 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [39] imperfect sequences [] total 39 [2022-03-19 08:14:15,045 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [115034816] [2022-03-19 08:14:15,045 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:14:15,046 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2022-03-19 08:14:15,046 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:14:15,046 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2022-03-19 08:14:15,046 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1557, Invalid=4295, Unknown=0, NotChecked=0, Total=5852 [2022-03-19 08:14:15,047 INFO L87 Difference]: Start difference. First operand 85 states and 87 transitions. Second operand has 39 states, 39 states have (on average 2.0256410256410255) internal successors, (79), 38 states have internal predecessors, (79), 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) [2022-03-19 08:14:16,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:14:16,665 INFO L93 Difference]: Finished difference Result 94 states and 98 transitions. [2022-03-19 08:14:16,666 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2022-03-19 08:14:16,666 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 2.0256410256410255) internal successors, (79), 38 states have internal predecessors, (79), 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 83 [2022-03-19 08:14:16,666 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:14:16,666 INFO L225 Difference]: With dead ends: 94 [2022-03-19 08:14:16,666 INFO L226 Difference]: Without dead ends: 87 [2022-03-19 08:14:16,668 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 242 GetRequests, 129 SyntacticMatches, 2 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 743 ImplicationChecksByTransitivity, 20.9s TimeCoverageRelationStatistics Valid=3103, Invalid=9553, Unknown=0, NotChecked=0, Total=12656 [2022-03-19 08:14:16,668 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 44 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 2572 mSolverCounterSat, 73 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 2645 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 73 IncrementalHoareTripleChecker+Valid, 2572 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-03-19 08:14:16,668 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 84 Invalid, 2645 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [73 Valid, 2572 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-03-19 08:14:16,669 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2022-03-19 08:14:16,675 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 87. [2022-03-19 08:14:16,676 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 82 states have (on average 1.0365853658536586) internal successors, (85), 82 states have internal predecessors, (85), 3 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) [2022-03-19 08:14:16,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 89 transitions. [2022-03-19 08:14:16,676 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 89 transitions. Word has length 83 [2022-03-19 08:14:16,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:14:16,676 INFO L478 AbstractCegarLoop]: Abstraction has 87 states and 89 transitions. [2022-03-19 08:14:16,677 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 2.0256410256410255) internal successors, (79), 38 states have internal predecessors, (79), 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) [2022-03-19 08:14:16,677 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 89 transitions. [2022-03-19 08:14:16,677 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2022-03-19 08:14:16,677 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:14:16,677 INFO L500 BasicCegarLoop]: trace histogram [37, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:14:16,694 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Ended with exit code 0 [2022-03-19 08:14:16,886 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable71,SelfDestructingSolverStorable72,36 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:14:16,887 INFO L403 AbstractCegarLoop]: === Iteration 39 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:14:16,887 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:14:16,887 INFO L85 PathProgramCache]: Analyzing trace with hash 385605905, now seen corresponding path program 71 times [2022-03-19 08:14:16,887 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:14:16,887 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2012624105] [2022-03-19 08:14:17,020 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-19 08:14:17,021 INFO L85 PathProgramCache]: Analyzing trace with hash 824616881, now seen corresponding path program 1 times [2022-03-19 08:14:17,021 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:14:17,021 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [664244029] [2022-03-19 08:14:17,021 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:14:17,021 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:14:17,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:14:17,025 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 08:14:17,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:14:17,029 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 08:14:17,029 INFO L85 PathProgramCache]: Analyzing trace with hash 385605905, now seen corresponding path program 72 times [2022-03-19 08:14:17,029 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:14:17,029 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1576775462] [2022-03-19 08:14:17,029 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:14:17,030 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:14:17,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:14:17,725 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:14:17,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:14:17,728 INFO L134 CoverageAnalysis]: Checked inductivity of 1369 backedges. 37 proven. 1332 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:14:17,728 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:14:17,729 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1576775462] [2022-03-19 08:14:17,729 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1576775462] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:14:17,729 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2046548497] [2022-03-19 08:14:17,729 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-19 08:14:17,729 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:14:17,729 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:14:17,730 INFO L229 MonitoredProcess]: Starting monitored process 37 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:14:17,730 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2022-03-19 08:14:17,784 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-03-19 08:14:17,784 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 08:14:17,785 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 11 conjunts are in the unsatisfiable core [2022-03-19 08:14:17,786 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:14:19,063 INFO L134 CoverageAnalysis]: Checked inductivity of 1369 backedges. 108 proven. 1 refuted. 0 times theorem prover too weak. 1260 trivial. 0 not checked. [2022-03-19 08:14:19,063 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:14:20,633 INFO L134 CoverageAnalysis]: Checked inductivity of 1369 backedges. 108 proven. 1 refuted. 0 times theorem prover too weak. 1260 trivial. 0 not checked. [2022-03-19 08:14:20,633 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2046548497] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:14:20,633 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:14:20,633 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 4, 8] total 48 [2022-03-19 08:14:20,633 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:14:20,634 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2012624105] [2022-03-19 08:14:20,634 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2012624105] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:14:20,634 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:14:20,634 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [40] imperfect sequences [] total 40 [2022-03-19 08:14:20,634 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1062518562] [2022-03-19 08:14:20,634 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:14:20,634 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-03-19 08:14:20,634 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:14:20,635 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-03-19 08:14:20,635 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=284, Invalid=1972, Unknown=0, NotChecked=0, Total=2256 [2022-03-19 08:14:20,635 INFO L87 Difference]: Start difference. First operand 87 states and 89 transitions. Second operand has 40 states, 40 states have (on average 2.025) internal successors, (81), 39 states have internal predecessors, (81), 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) [2022-03-19 08:14:22,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:14:22,738 INFO L93 Difference]: Finished difference Result 96 states and 100 transitions. [2022-03-19 08:14:22,738 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-03-19 08:14:22,738 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 2.025) internal successors, (81), 39 states have internal predecessors, (81), 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 85 [2022-03-19 08:14:22,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:14:22,739 INFO L225 Difference]: With dead ends: 96 [2022-03-19 08:14:22,739 INFO L226 Difference]: Without dead ends: 89 [2022-03-19 08:14:22,739 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 248 GetRequests, 164 SyntacticMatches, 1 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 677 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=650, Invalid=6490, Unknown=0, NotChecked=0, Total=7140 [2022-03-19 08:14:22,740 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 45 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 2685 mSolverCounterSat, 75 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 59 SdHoareTripleChecker+Invalid, 2760 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 75 IncrementalHoareTripleChecker+Valid, 2685 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-03-19 08:14:22,740 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [45 Valid, 59 Invalid, 2760 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [75 Valid, 2685 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-03-19 08:14:22,740 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2022-03-19 08:14:22,747 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 89. [2022-03-19 08:14:22,747 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 84 states have (on average 1.0357142857142858) internal successors, (87), 84 states have internal predecessors, (87), 3 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) [2022-03-19 08:14:22,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 91 transitions. [2022-03-19 08:14:22,748 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 91 transitions. Word has length 85 [2022-03-19 08:14:22,748 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:14:22,748 INFO L478 AbstractCegarLoop]: Abstraction has 89 states and 91 transitions. [2022-03-19 08:14:22,748 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 2.025) internal successors, (81), 39 states have internal predecessors, (81), 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) [2022-03-19 08:14:22,748 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 91 transitions. [2022-03-19 08:14:22,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2022-03-19 08:14:22,748 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:14:22,748 INFO L500 BasicCegarLoop]: trace histogram [38, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:14:22,752 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Forceful destruction successful, exit code 0 [2022-03-19 08:14:22,949 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable73,SelfDestructingSolverStorable74,37 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:14:22,949 INFO L403 AbstractCegarLoop]: === Iteration 40 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:14:22,949 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:14:22,949 INFO L85 PathProgramCache]: Analyzing trace with hash -1152942994, now seen corresponding path program 73 times [2022-03-19 08:14:22,949 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:14:22,949 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [505817102] [2022-03-19 08:14:23,070 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-19 08:14:23,070 INFO L85 PathProgramCache]: Analyzing trace with hash 883722225, now seen corresponding path program 1 times [2022-03-19 08:14:23,071 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:14:23,071 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1821380597] [2022-03-19 08:14:23,071 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:14:23,071 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:14:23,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:14:23,075 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 08:14:23,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:14:23,078 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 08:14:23,078 INFO L85 PathProgramCache]: Analyzing trace with hash -1152942994, now seen corresponding path program 74 times [2022-03-19 08:14:23,078 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:14:23,079 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [244825851] [2022-03-19 08:14:23,079 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:14:23,079 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:14:23,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:14:23,879 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:14:23,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:14:23,882 INFO L134 CoverageAnalysis]: Checked inductivity of 1444 backedges. 38 proven. 1406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:14:23,882 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:14:23,882 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [244825851] [2022-03-19 08:14:23,882 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [244825851] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:14:23,882 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [946987868] [2022-03-19 08:14:23,882 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-19 08:14:23,882 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:14:23,882 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:14:23,883 INFO L229 MonitoredProcess]: Starting monitored process 38 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:14:23,884 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2022-03-19 08:14:23,948 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-19 08:14:23,948 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 08:14:23,949 INFO L263 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 82 conjunts are in the unsatisfiable core [2022-03-19 08:14:23,951 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:14:24,256 INFO L134 CoverageAnalysis]: Checked inductivity of 1444 backedges. 0 proven. 1444 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:14:24,256 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:14:45,561 INFO L134 CoverageAnalysis]: Checked inductivity of 1444 backedges. 0 proven. 1444 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:14:45,562 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [946987868] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:14:45,562 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:14:45,562 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 44] total 85 [2022-03-19 08:14:45,562 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:14:45,562 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [505817102] [2022-03-19 08:14:45,562 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [505817102] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:14:45,562 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:14:45,562 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [41] imperfect sequences [] total 41 [2022-03-19 08:14:45,563 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [170262202] [2022-03-19 08:14:45,563 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:14:45,563 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2022-03-19 08:14:45,563 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:14:45,563 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2022-03-19 08:14:45,564 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1766, Invalid=5374, Unknown=0, NotChecked=0, Total=7140 [2022-03-19 08:14:45,564 INFO L87 Difference]: Start difference. First operand 89 states and 91 transitions. Second operand has 41 states, 41 states have (on average 2.024390243902439) internal successors, (83), 40 states have internal predecessors, (83), 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) [2022-03-19 08:14:47,815 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:14:47,816 INFO L93 Difference]: Finished difference Result 98 states and 102 transitions. [2022-03-19 08:14:47,816 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2022-03-19 08:14:47,816 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 2.024390243902439) internal successors, (83), 40 states have internal predecessors, (83), 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 87 [2022-03-19 08:14:47,816 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:14:47,817 INFO L225 Difference]: With dead ends: 98 [2022-03-19 08:14:47,817 INFO L226 Difference]: Without dead ends: 91 [2022-03-19 08:14:47,818 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 254 GetRequests, 131 SyntacticMatches, 2 SemanticMatches, 121 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 831 ImplicationChecksByTransitivity, 22.0s TimeCoverageRelationStatistics Valid=3474, Invalid=11532, Unknown=0, NotChecked=0, Total=15006 [2022-03-19 08:14:47,818 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 46 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 2814 mSolverCounterSat, 77 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 2891 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 77 IncrementalHoareTripleChecker+Valid, 2814 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-03-19 08:14:47,819 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [46 Valid, 44 Invalid, 2891 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [77 Valid, 2814 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-03-19 08:14:47,819 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2022-03-19 08:14:47,837 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2022-03-19 08:14:47,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 86 states have (on average 1.0348837209302326) internal successors, (89), 86 states have internal predecessors, (89), 3 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) [2022-03-19 08:14:47,838 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 93 transitions. [2022-03-19 08:14:47,838 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 93 transitions. Word has length 87 [2022-03-19 08:14:47,838 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:14:47,838 INFO L478 AbstractCegarLoop]: Abstraction has 91 states and 93 transitions. [2022-03-19 08:14:47,839 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 2.024390243902439) internal successors, (83), 40 states have internal predecessors, (83), 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) [2022-03-19 08:14:47,839 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 93 transitions. [2022-03-19 08:14:47,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2022-03-19 08:14:47,839 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:14:47,839 INFO L500 BasicCegarLoop]: trace histogram [39, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:14:47,862 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Ended with exit code 0 [2022-03-19 08:14:48,040 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable75,SelfDestructingSolverStorable76,38 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:14:48,040 INFO L403 AbstractCegarLoop]: === Iteration 41 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:14:48,040 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:14:48,040 INFO L85 PathProgramCache]: Analyzing trace with hash 2065282187, now seen corresponding path program 75 times [2022-03-19 08:14:48,040 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:14:48,040 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [205625131] [2022-03-19 08:14:48,167 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-19 08:14:48,167 INFO L85 PathProgramCache]: Analyzing trace with hash 942827569, now seen corresponding path program 1 times [2022-03-19 08:14:48,167 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:14:48,167 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1244108435] [2022-03-19 08:14:48,167 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:14:48,167 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:14:48,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:14:48,171 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 08:14:48,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:14:48,174 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 08:14:48,174 INFO L85 PathProgramCache]: Analyzing trace with hash 2065282187, now seen corresponding path program 76 times [2022-03-19 08:14:48,174 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:14:48,174 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1324790187] [2022-03-19 08:14:48,174 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:14:48,174 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:14:48,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:14:48,973 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:14:48,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:14:48,975 INFO L134 CoverageAnalysis]: Checked inductivity of 1521 backedges. 39 proven. 1482 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:14:48,975 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:14:48,975 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1324790187] [2022-03-19 08:14:48,976 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1324790187] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:14:48,976 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [878313477] [2022-03-19 08:14:48,976 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-19 08:14:48,976 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:14:48,976 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:14:48,977 INFO L229 MonitoredProcess]: Starting monitored process 39 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:14:48,977 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2022-03-19 08:14:49,040 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-19 08:14:49,040 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 08:14:49,042 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 80 conjunts are in the unsatisfiable core [2022-03-19 08:14:49,043 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:14:49,320 INFO L134 CoverageAnalysis]: Checked inductivity of 1521 backedges. 39 proven. 1482 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:14:49,320 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:15:47,868 INFO L134 CoverageAnalysis]: Checked inductivity of 1521 backedges. 39 proven. 1482 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:15:47,869 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [878313477] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:15:47,869 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:15:47,869 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 41, 42] total 83 [2022-03-19 08:15:47,869 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:15:47,869 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [205625131] [2022-03-19 08:15:47,869 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [205625131] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:15:47,869 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:15:47,869 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [42] imperfect sequences [] total 42 [2022-03-19 08:15:47,869 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1186654652] [2022-03-19 08:15:47,869 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:15:47,870 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2022-03-19 08:15:47,870 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:15:47,870 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2022-03-19 08:15:47,871 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1803, Invalid=5003, Unknown=0, NotChecked=0, Total=6806 [2022-03-19 08:15:47,871 INFO L87 Difference]: Start difference. First operand 91 states and 93 transitions. Second operand has 42 states, 42 states have (on average 2.0238095238095237) internal successors, (85), 41 states have internal predecessors, (85), 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) [2022-03-19 08:15:49,780 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:15:49,780 INFO L93 Difference]: Finished difference Result 100 states and 104 transitions. [2022-03-19 08:15:49,781 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2022-03-19 08:15:49,781 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 2.0238095238095237) internal successors, (85), 41 states have internal predecessors, (85), 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 89 [2022-03-19 08:15:49,781 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:15:49,781 INFO L225 Difference]: With dead ends: 100 [2022-03-19 08:15:49,781 INFO L226 Difference]: Without dead ends: 93 [2022-03-19 08:15:49,783 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 260 GetRequests, 138 SyntacticMatches, 2 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 863 ImplicationChecksByTransitivity, 57.6s TimeCoverageRelationStatistics Valid=3595, Invalid=11167, Unknown=0, NotChecked=0, Total=14762 [2022-03-19 08:15:49,783 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 47 mSDsluCounter, 147 mSDsCounter, 0 mSdLazyCounter, 3103 mSolverCounterSat, 79 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 159 SdHoareTripleChecker+Invalid, 3182 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 79 IncrementalHoareTripleChecker+Valid, 3103 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-03-19 08:15:49,783 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [47 Valid, 159 Invalid, 3182 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [79 Valid, 3103 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-03-19 08:15:49,783 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2022-03-19 08:15:49,790 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 93. [2022-03-19 08:15:49,790 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 88 states have (on average 1.0340909090909092) internal successors, (91), 88 states have internal predecessors, (91), 3 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) [2022-03-19 08:15:49,790 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 95 transitions. [2022-03-19 08:15:49,791 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 95 transitions. Word has length 89 [2022-03-19 08:15:49,791 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:15:49,791 INFO L478 AbstractCegarLoop]: Abstraction has 93 states and 95 transitions. [2022-03-19 08:15:49,791 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 2.0238095238095237) internal successors, (85), 41 states have internal predecessors, (85), 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) [2022-03-19 08:15:49,791 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 95 transitions. [2022-03-19 08:15:49,791 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2022-03-19 08:15:49,791 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:15:49,791 INFO L500 BasicCegarLoop]: trace histogram [40, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:15:49,809 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Ended with exit code 0 [2022-03-19 08:15:49,996 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable77,SelfDestructingSolverStorable78 [2022-03-19 08:15:49,996 INFO L403 AbstractCegarLoop]: === Iteration 42 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:15:49,996 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:15:49,996 INFO L85 PathProgramCache]: Analyzing trace with hash -1891739288, now seen corresponding path program 77 times [2022-03-19 08:15:49,997 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:15:49,997 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2105387824] [2022-03-19 08:15:50,149 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-19 08:15:50,149 INFO L85 PathProgramCache]: Analyzing trace with hash 1001932913, now seen corresponding path program 1 times [2022-03-19 08:15:50,150 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:15:50,150 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [984569233] [2022-03-19 08:15:50,150 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:15:50,150 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:15:50,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:15:50,153 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 08:15:50,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:15:50,156 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 08:15:50,156 INFO L85 PathProgramCache]: Analyzing trace with hash -1891739288, now seen corresponding path program 78 times [2022-03-19 08:15:50,156 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:15:50,156 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1794231728] [2022-03-19 08:15:50,156 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:15:50,156 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:15:50,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:15:50,993 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:15:50,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:15:50,996 INFO L134 CoverageAnalysis]: Checked inductivity of 1600 backedges. 40 proven. 1560 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:15:50,996 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:15:50,996 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1794231728] [2022-03-19 08:15:50,996 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1794231728] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:15:50,996 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [826654420] [2022-03-19 08:15:50,996 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-19 08:15:50,997 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:15:50,997 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:15:50,998 INFO L229 MonitoredProcess]: Starting monitored process 40 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:15:50,998 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2022-03-19 08:15:51,035 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-03-19 08:15:51,036 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 08:15:51,036 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 11 conjunts are in the unsatisfiable core [2022-03-19 08:15:51,037 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:15:53,345 INFO L134 CoverageAnalysis]: Checked inductivity of 1600 backedges. 117 proven. 1 refuted. 0 times theorem prover too weak. 1482 trivial. 0 not checked. [2022-03-19 08:15:53,345 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:15:55,421 INFO L134 CoverageAnalysis]: Checked inductivity of 1600 backedges. 117 proven. 1 refuted. 0 times theorem prover too weak. 1482 trivial. 0 not checked. [2022-03-19 08:15:55,422 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [826654420] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:15:55,422 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:15:55,422 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 4, 8] total 51 [2022-03-19 08:15:55,422 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:15:55,422 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [2105387824] [2022-03-19 08:15:55,422 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [2105387824] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:15:55,422 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:15:55,423 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [43] imperfect sequences [] total 43 [2022-03-19 08:15:55,423 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1037265957] [2022-03-19 08:15:55,423 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:15:55,423 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2022-03-19 08:15:55,423 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:15:55,423 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2022-03-19 08:15:55,424 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=305, Invalid=2245, Unknown=0, NotChecked=0, Total=2550 [2022-03-19 08:15:55,424 INFO L87 Difference]: Start difference. First operand 93 states and 95 transitions. Second operand has 43 states, 43 states have (on average 2.0232558139534884) internal successors, (87), 42 states have internal predecessors, (87), 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) [2022-03-19 08:15:58,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:15:58,057 INFO L93 Difference]: Finished difference Result 102 states and 106 transitions. [2022-03-19 08:15:58,057 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2022-03-19 08:15:58,057 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 2.0232558139534884) internal successors, (87), 42 states have internal predecessors, (87), 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 91 [2022-03-19 08:15:58,057 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:15:58,058 INFO L225 Difference]: With dead ends: 102 [2022-03-19 08:15:58,058 INFO L226 Difference]: Without dead ends: 95 [2022-03-19 08:15:58,058 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 266 GetRequests, 176 SyntacticMatches, 1 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 791 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=701, Invalid=7489, Unknown=0, NotChecked=0, Total=8190 [2022-03-19 08:15:58,059 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 48 mSDsluCounter, 142 mSDsCounter, 0 mSdLazyCounter, 3252 mSolverCounterSat, 81 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 154 SdHoareTripleChecker+Invalid, 3333 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 81 IncrementalHoareTripleChecker+Valid, 3252 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-03-19 08:15:58,059 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 154 Invalid, 3333 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [81 Valid, 3252 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-03-19 08:15:58,059 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2022-03-19 08:15:58,067 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 95. [2022-03-19 08:15:58,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 90 states have (on average 1.0333333333333334) internal successors, (93), 90 states have internal predecessors, (93), 3 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) [2022-03-19 08:15:58,068 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 97 transitions. [2022-03-19 08:15:58,068 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 97 transitions. Word has length 91 [2022-03-19 08:15:58,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:15:58,068 INFO L478 AbstractCegarLoop]: Abstraction has 95 states and 97 transitions. [2022-03-19 08:15:58,068 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 2.0232558139534884) internal successors, (87), 42 states have internal predecessors, (87), 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) [2022-03-19 08:15:58,068 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 97 transitions. [2022-03-19 08:15:58,069 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2022-03-19 08:15:58,069 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:15:58,069 INFO L500 BasicCegarLoop]: trace histogram [41, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:15:58,087 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Forceful destruction successful, exit code 0 [2022-03-19 08:15:58,269 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable80,40 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable79 [2022-03-19 08:15:58,269 INFO L403 AbstractCegarLoop]: === Iteration 43 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:15:58,269 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:15:58,270 INFO L85 PathProgramCache]: Analyzing trace with hash 751647493, now seen corresponding path program 79 times [2022-03-19 08:15:58,270 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:15:58,270 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1472375505] [2022-03-19 08:15:58,401 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-19 08:15:58,401 INFO L85 PathProgramCache]: Analyzing trace with hash 1061038257, now seen corresponding path program 1 times [2022-03-19 08:15:58,401 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:15:58,401 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1106261460] [2022-03-19 08:15:58,401 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:15:58,401 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:15:58,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:15:58,404 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 08:15:58,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:15:58,407 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 08:15:58,407 INFO L85 PathProgramCache]: Analyzing trace with hash 751647493, now seen corresponding path program 80 times [2022-03-19 08:15:58,407 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:15:58,408 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1584844952] [2022-03-19 08:15:58,408 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:15:58,408 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:15:58,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:15:59,297 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:15:59,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:15:59,300 INFO L134 CoverageAnalysis]: Checked inductivity of 1681 backedges. 41 proven. 1640 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:15:59,300 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:15:59,300 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1584844952] [2022-03-19 08:15:59,300 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1584844952] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:15:59,300 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1690755023] [2022-03-19 08:15:59,300 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-19 08:15:59,301 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:15:59,301 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:15:59,302 INFO L229 MonitoredProcess]: Starting monitored process 41 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:15:59,303 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2022-03-19 08:15:59,396 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-19 08:15:59,396 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 08:15:59,398 INFO L263 TraceCheckSpWp]: Trace formula consists of 215 conjuncts, 88 conjunts are in the unsatisfiable core [2022-03-19 08:15:59,399 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:15:59,717 INFO L134 CoverageAnalysis]: Checked inductivity of 1681 backedges. 0 proven. 1681 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:15:59,718 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:16:29,724 INFO L134 CoverageAnalysis]: Checked inductivity of 1681 backedges. 0 proven. 1681 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:16:29,724 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1690755023] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:16:29,725 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:16:29,725 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 47] total 91 [2022-03-19 08:16:29,725 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:16:29,725 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1472375505] [2022-03-19 08:16:29,725 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1472375505] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:16:29,725 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:16:29,725 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [44] imperfect sequences [] total 44 [2022-03-19 08:16:29,725 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [398920732] [2022-03-19 08:16:29,725 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:16:29,725 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2022-03-19 08:16:29,725 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:16:29,726 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2022-03-19 08:16:29,726 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2027, Invalid=6163, Unknown=0, NotChecked=0, Total=8190 [2022-03-19 08:16:29,726 INFO L87 Difference]: Start difference. First operand 95 states and 97 transitions. Second operand has 44 states, 44 states have (on average 2.022727272727273) internal successors, (89), 43 states have internal predecessors, (89), 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) [2022-03-19 08:16:32,400 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:16:32,400 INFO L93 Difference]: Finished difference Result 104 states and 108 transitions. [2022-03-19 08:16:32,401 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2022-03-19 08:16:32,401 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 2.022727272727273) internal successors, (89), 43 states have internal predecessors, (89), 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 93 [2022-03-19 08:16:32,401 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:16:32,401 INFO L225 Difference]: With dead ends: 104 [2022-03-19 08:16:32,402 INFO L226 Difference]: Without dead ends: 97 [2022-03-19 08:16:32,402 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 272 GetRequests, 140 SyntacticMatches, 2 SemanticMatches, 130 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 957 ImplicationChecksByTransitivity, 30.6s TimeCoverageRelationStatistics Valid=3993, Invalid=13299, Unknown=0, NotChecked=0, Total=17292 [2022-03-19 08:16:32,403 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 49 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 3297 mSolverCounterSat, 83 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 59 SdHoareTripleChecker+Invalid, 3380 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 83 IncrementalHoareTripleChecker+Valid, 3297 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-03-19 08:16:32,403 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [49 Valid, 59 Invalid, 3380 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [83 Valid, 3297 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-03-19 08:16:32,403 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2022-03-19 08:16:32,410 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 97. [2022-03-19 08:16:32,410 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 92 states have (on average 1.0326086956521738) internal successors, (95), 92 states have internal predecessors, (95), 3 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) [2022-03-19 08:16:32,411 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 99 transitions. [2022-03-19 08:16:32,411 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 99 transitions. Word has length 93 [2022-03-19 08:16:32,411 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:16:32,411 INFO L478 AbstractCegarLoop]: Abstraction has 97 states and 99 transitions. [2022-03-19 08:16:32,411 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 2.022727272727273) internal successors, (89), 43 states have internal predecessors, (89), 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) [2022-03-19 08:16:32,411 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 99 transitions. [2022-03-19 08:16:32,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2022-03-19 08:16:32,412 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:16:32,412 INFO L500 BasicCegarLoop]: trace histogram [42, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:16:32,430 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Forceful destruction successful, exit code 0 [2022-03-19 08:16:32,621 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable81,SelfDestructingSolverStorable82 [2022-03-19 08:16:32,621 INFO L403 AbstractCegarLoop]: === Iteration 44 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:16:32,622 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:16:32,622 INFO L85 PathProgramCache]: Analyzing trace with hash -1574295198, now seen corresponding path program 81 times [2022-03-19 08:16:32,622 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:16:32,622 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [773684919] [2022-03-19 08:16:32,734 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-19 08:16:32,734 INFO L85 PathProgramCache]: Analyzing trace with hash 1120143601, now seen corresponding path program 1 times [2022-03-19 08:16:32,734 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:16:32,735 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [977864410] [2022-03-19 08:16:32,735 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:16:32,735 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:16:32,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:16:32,738 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 08:16:32,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:16:32,741 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 08:16:32,741 INFO L85 PathProgramCache]: Analyzing trace with hash -1574295198, now seen corresponding path program 82 times [2022-03-19 08:16:32,741 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:16:32,742 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [998195546] [2022-03-19 08:16:32,742 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:16:32,742 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:16:32,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:16:33,595 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:16:33,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:16:33,598 INFO L134 CoverageAnalysis]: Checked inductivity of 1764 backedges. 42 proven. 1722 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:16:33,598 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:16:33,598 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [998195546] [2022-03-19 08:16:33,598 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [998195546] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:16:33,598 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [105074329] [2022-03-19 08:16:33,598 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-19 08:16:33,598 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:16:33,598 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:16:33,599 INFO L229 MonitoredProcess]: Starting monitored process 42 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:16:33,600 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2022-03-19 08:16:33,679 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-19 08:16:33,679 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 08:16:33,681 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 86 conjunts are in the unsatisfiable core [2022-03-19 08:16:33,682 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:16:33,965 INFO L134 CoverageAnalysis]: Checked inductivity of 1764 backedges. 42 proven. 1722 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:16:33,965 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:18:04,250 INFO L134 CoverageAnalysis]: Checked inductivity of 1764 backedges. 42 proven. 1722 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:18:04,251 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [105074329] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:18:04,251 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:18:04,251 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 44, 45] total 89 [2022-03-19 08:18:04,251 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:18:04,251 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [773684919] [2022-03-19 08:18:04,251 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [773684919] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:18:04,252 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:18:04,252 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [45] imperfect sequences [] total 45 [2022-03-19 08:18:04,252 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [652207900] [2022-03-19 08:18:04,252 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:18:04,252 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2022-03-19 08:18:04,252 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:18:04,252 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2022-03-19 08:18:04,253 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2067, Invalid=5765, Unknown=0, NotChecked=0, Total=7832 [2022-03-19 08:18:04,253 INFO L87 Difference]: Start difference. First operand 97 states and 99 transitions. Second operand has 45 states, 45 states have (on average 2.022222222222222) internal successors, (91), 44 states have internal predecessors, (91), 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) [2022-03-19 08:18:06,399 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:18:06,400 INFO L93 Difference]: Finished difference Result 106 states and 110 transitions. [2022-03-19 08:18:06,400 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2022-03-19 08:18:06,400 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 2.022222222222222) internal successors, (91), 44 states have internal predecessors, (91), 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 95 [2022-03-19 08:18:06,400 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:18:06,401 INFO L225 Difference]: With dead ends: 106 [2022-03-19 08:18:06,401 INFO L226 Difference]: Without dead ends: 99 [2022-03-19 08:18:06,402 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 278 GetRequests, 147 SyntacticMatches, 2 SemanticMatches, 129 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 992 ImplicationChecksByTransitivity, 88.8s TimeCoverageRelationStatistics Valid=4123, Invalid=12907, Unknown=0, NotChecked=0, Total=17030 [2022-03-19 08:18:06,402 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 50 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 3442 mSolverCounterSat, 85 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 3527 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 85 IncrementalHoareTripleChecker+Valid, 3442 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-03-19 08:18:06,402 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [50 Valid, 44 Invalid, 3527 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [85 Valid, 3442 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2022-03-19 08:18:06,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2022-03-19 08:18:06,410 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 99. [2022-03-19 08:18:06,410 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 94 states have (on average 1.0319148936170213) internal successors, (97), 94 states have internal predecessors, (97), 3 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) [2022-03-19 08:18:06,410 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 101 transitions. [2022-03-19 08:18:06,411 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 101 transitions. Word has length 95 [2022-03-19 08:18:06,411 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:18:06,411 INFO L478 AbstractCegarLoop]: Abstraction has 99 states and 101 transitions. [2022-03-19 08:18:06,411 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 2.022222222222222) internal successors, (91), 44 states have internal predecessors, (91), 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) [2022-03-19 08:18:06,411 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 101 transitions. [2022-03-19 08:18:06,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2022-03-19 08:18:06,411 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:18:06,411 INFO L500 BasicCegarLoop]: trace histogram [43, 42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:18:06,429 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Ended with exit code 0 [2022-03-19 08:18:06,613 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable83,SelfDestructingSolverStorable84,42 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:18:06,613 INFO L403 AbstractCegarLoop]: === Iteration 45 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:18:06,613 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:18:06,613 INFO L85 PathProgramCache]: Analyzing trace with hash 872739967, now seen corresponding path program 83 times [2022-03-19 08:18:06,613 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:18:06,613 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [3245716] [2022-03-19 08:18:06,770 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-19 08:18:06,771 INFO L85 PathProgramCache]: Analyzing trace with hash 1179248945, now seen corresponding path program 1 times [2022-03-19 08:18:06,771 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:18:06,771 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1324336358] [2022-03-19 08:18:06,771 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:18:06,771 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:18:06,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:18:06,775 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 08:18:06,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:18:06,778 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 08:18:06,779 INFO L85 PathProgramCache]: Analyzing trace with hash 872739967, now seen corresponding path program 84 times [2022-03-19 08:18:06,779 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:18:06,779 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1582262513] [2022-03-19 08:18:06,779 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:18:06,779 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:18:06,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:18:07,700 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:18:07,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:18:07,703 INFO L134 CoverageAnalysis]: Checked inductivity of 1849 backedges. 43 proven. 1806 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:18:07,704 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:18:07,704 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1582262513] [2022-03-19 08:18:07,704 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1582262513] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:18:07,704 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [541825670] [2022-03-19 08:18:07,704 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-19 08:18:07,704 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:18:07,704 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:18:07,705 INFO L229 MonitoredProcess]: Starting monitored process 43 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:18:07,706 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2022-03-19 08:18:07,740 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-03-19 08:18:07,740 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 08:18:07,741 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 9 conjunts are in the unsatisfiable core [2022-03-19 08:18:07,743 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:18:11,210 INFO L134 CoverageAnalysis]: Checked inductivity of 1849 backedges. 126 proven. 1 refuted. 0 times theorem prover too weak. 1722 trivial. 0 not checked. [2022-03-19 08:18:11,211 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:18:13,550 INFO L134 CoverageAnalysis]: Checked inductivity of 1849 backedges. 126 proven. 1 refuted. 0 times theorem prover too weak. 1722 trivial. 0 not checked. [2022-03-19 08:18:13,550 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [541825670] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:18:13,550 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:18:13,550 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 4, 7] total 53 [2022-03-19 08:18:13,551 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:18:13,551 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [3245716] [2022-03-19 08:18:13,551 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [3245716] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:18:13,551 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:18:13,551 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [46] imperfect sequences [] total 46 [2022-03-19 08:18:13,551 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [878075087] [2022-03-19 08:18:13,551 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:18:13,551 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2022-03-19 08:18:13,551 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:18:13,552 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2022-03-19 08:18:13,552 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=316, Invalid=2440, Unknown=0, NotChecked=0, Total=2756 [2022-03-19 08:18:13,552 INFO L87 Difference]: Start difference. First operand 99 states and 101 transitions. Second operand has 46 states, 46 states have (on average 2.0217391304347827) internal successors, (93), 45 states have internal predecessors, (93), 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) [2022-03-19 08:18:16,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:18:16,516 INFO L93 Difference]: Finished difference Result 108 states and 112 transitions. [2022-03-19 08:18:16,516 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2022-03-19 08:18:16,516 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 2.0217391304347827) internal successors, (93), 45 states have internal predecessors, (93), 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 97 [2022-03-19 08:18:16,516 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:18:16,521 INFO L225 Difference]: With dead ends: 108 [2022-03-19 08:18:16,522 INFO L226 Difference]: Without dead ends: 101 [2022-03-19 08:18:16,523 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 284 GetRequests, 189 SyntacticMatches, 1 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 917 ImplicationChecksByTransitivity, 7.9s TimeCoverageRelationStatistics Valid=738, Invalid=8382, Unknown=0, NotChecked=0, Total=9120 [2022-03-19 08:18:16,523 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 51 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 3621 mSolverCounterSat, 87 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 54 SdHoareTripleChecker+Invalid, 3708 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 87 IncrementalHoareTripleChecker+Valid, 3621 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-03-19 08:18:16,523 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [51 Valid, 54 Invalid, 3708 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [87 Valid, 3621 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2022-03-19 08:18:16,523 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2022-03-19 08:18:16,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 101. [2022-03-19 08:18:16,531 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 101 states, 96 states have (on average 1.03125) internal successors, (99), 96 states have internal predecessors, (99), 3 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) [2022-03-19 08:18:16,532 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 103 transitions. [2022-03-19 08:18:16,532 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 103 transitions. Word has length 97 [2022-03-19 08:18:16,532 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:18:16,532 INFO L478 AbstractCegarLoop]: Abstraction has 101 states and 103 transitions. [2022-03-19 08:18:16,532 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 2.0217391304347827) internal successors, (93), 45 states have internal predecessors, (93), 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) [2022-03-19 08:18:16,532 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 103 transitions. [2022-03-19 08:18:16,532 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2022-03-19 08:18:16,532 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:18:16,532 INFO L500 BasicCegarLoop]: trace histogram [44, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:18:16,549 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Forceful destruction successful, exit code 0 [2022-03-19 08:18:16,738 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable85,SelfDestructingSolverStorable86,43 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:18:16,738 INFO L403 AbstractCegarLoop]: === Iteration 46 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:18:16,739 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:18:16,739 INFO L85 PathProgramCache]: Analyzing trace with hash -1168544676, now seen corresponding path program 85 times [2022-03-19 08:18:16,739 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:18:16,739 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1203598432] [2022-03-19 08:18:16,873 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-19 08:18:16,873 INFO L85 PathProgramCache]: Analyzing trace with hash 1238354289, now seen corresponding path program 1 times [2022-03-19 08:18:16,873 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:18:16,874 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1664586093] [2022-03-19 08:18:16,874 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:18:16,874 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:18:16,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:18:16,878 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 08:18:16,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:18:16,882 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 08:18:16,882 INFO L85 PathProgramCache]: Analyzing trace with hash -1168544676, now seen corresponding path program 86 times [2022-03-19 08:18:16,882 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:18:16,882 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2018166986] [2022-03-19 08:18:16,882 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:18:16,882 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:18:16,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:18:17,814 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:18:17,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:18:17,820 INFO L134 CoverageAnalysis]: Checked inductivity of 1936 backedges. 44 proven. 1892 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:18:17,820 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:18:17,820 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2018166986] [2022-03-19 08:18:17,820 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2018166986] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:18:17,821 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1689267465] [2022-03-19 08:18:17,821 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-19 08:18:17,821 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:18:17,821 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:18:17,822 INFO L229 MonitoredProcess]: Starting monitored process 44 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:18:17,832 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2022-03-19 08:18:17,947 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-19 08:18:17,947 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 08:18:17,949 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 90 conjunts are in the unsatisfiable core [2022-03-19 08:18:17,950 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:18:18,247 INFO L134 CoverageAnalysis]: Checked inductivity of 1936 backedges. 44 proven. 1892 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:18:18,248 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:20:06,931 INFO L134 CoverageAnalysis]: Checked inductivity of 1936 backedges. 44 proven. 1892 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:20:06,931 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1689267465] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:20:06,931 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:20:06,931 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 46, 47] total 93 [2022-03-19 08:20:06,931 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:20:06,931 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1203598432] [2022-03-19 08:20:06,932 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1203598432] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:20:06,932 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:20:06,932 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [47] imperfect sequences [] total 47 [2022-03-19 08:20:06,932 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [215441125] [2022-03-19 08:20:06,932 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:20:06,932 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2022-03-19 08:20:06,932 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:20:06,932 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2022-03-19 08:20:06,933 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2253, Invalid=6303, Unknown=0, NotChecked=0, Total=8556 [2022-03-19 08:20:06,933 INFO L87 Difference]: Start difference. First operand 101 states and 103 transitions. Second operand has 47 states, 47 states have (on average 2.021276595744681) internal successors, (95), 46 states have internal predecessors, (95), 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) [2022-03-19 08:20:09,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:20:09,287 INFO L93 Difference]: Finished difference Result 110 states and 114 transitions. [2022-03-19 08:20:09,288 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2022-03-19 08:20:09,288 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 2.021276595744681) internal successors, (95), 46 states have internal predecessors, (95), 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 99 [2022-03-19 08:20:09,288 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:20:09,288 INFO L225 Difference]: With dead ends: 110 [2022-03-19 08:20:09,288 INFO L226 Difference]: Without dead ends: 103 [2022-03-19 08:20:09,289 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 290 GetRequests, 153 SyntacticMatches, 2 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1083 ImplicationChecksByTransitivity, 107.1s TimeCoverageRelationStatistics Valid=4495, Invalid=14137, Unknown=0, NotChecked=0, Total=18632 [2022-03-19 08:20:09,289 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 52 mSDsluCounter, 177 mSDsCounter, 0 mSdLazyCounter, 3954 mSolverCounterSat, 89 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 189 SdHoareTripleChecker+Invalid, 4043 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 89 IncrementalHoareTripleChecker+Valid, 3954 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-03-19 08:20:09,290 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [52 Valid, 189 Invalid, 4043 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [89 Valid, 3954 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2022-03-19 08:20:09,290 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2022-03-19 08:20:09,297 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2022-03-19 08:20:09,298 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 98 states have (on average 1.030612244897959) internal successors, (101), 98 states have internal predecessors, (101), 3 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) [2022-03-19 08:20:09,298 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 105 transitions. [2022-03-19 08:20:09,298 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 105 transitions. Word has length 99 [2022-03-19 08:20:09,298 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:20:09,298 INFO L478 AbstractCegarLoop]: Abstraction has 103 states and 105 transitions. [2022-03-19 08:20:09,298 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 2.021276595744681) internal successors, (95), 46 states have internal predecessors, (95), 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) [2022-03-19 08:20:09,298 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 105 transitions. [2022-03-19 08:20:09,299 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2022-03-19 08:20:09,299 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:20:09,299 INFO L500 BasicCegarLoop]: trace histogram [45, 44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:20:09,321 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Forceful destruction successful, exit code 0 [2022-03-19 08:20:09,511 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable87,SelfDestructingSolverStorable88 [2022-03-19 08:20:09,511 INFO L403 AbstractCegarLoop]: === Iteration 47 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:20:09,511 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:20:09,512 INFO L85 PathProgramCache]: Analyzing trace with hash -43032327, now seen corresponding path program 87 times [2022-03-19 08:20:09,512 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:20:09,512 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [603034409] [2022-03-19 08:20:09,627 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-19 08:20:09,627 INFO L85 PathProgramCache]: Analyzing trace with hash 1297459633, now seen corresponding path program 1 times [2022-03-19 08:20:09,627 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:20:09,627 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [189171208] [2022-03-19 08:20:09,628 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:20:09,628 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:20:09,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:20:09,630 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 08:20:09,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:20:09,633 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 08:20:09,633 INFO L85 PathProgramCache]: Analyzing trace with hash -43032327, now seen corresponding path program 88 times [2022-03-19 08:20:09,633 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:20:09,633 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [408528023] [2022-03-19 08:20:09,633 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:20:09,633 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:20:09,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:10,625 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:20:10,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:20:10,628 INFO L134 CoverageAnalysis]: Checked inductivity of 2025 backedges. 45 proven. 1980 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:20:10,628 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:20:10,628 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [408528023] [2022-03-19 08:20:10,628 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [408528023] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:20:10,628 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1294397702] [2022-03-19 08:20:10,628 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-19 08:20:10,628 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:20:10,628 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:20:10,629 INFO L229 MonitoredProcess]: Starting monitored process 45 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:20:10,630 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2022-03-19 08:20:10,674 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-19 08:20:10,675 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 08:20:10,676 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 92 conjunts are in the unsatisfiable core [2022-03-19 08:20:10,677 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:20:10,972 INFO L134 CoverageAnalysis]: Checked inductivity of 2025 backedges. 45 proven. 1980 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:20:10,972 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:21:08,548 INFO L134 CoverageAnalysis]: Checked inductivity of 2025 backedges. 45 proven. 1980 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:21:08,548 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1294397702] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:21:08,548 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:21:08,548 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 47, 48] total 95 [2022-03-19 08:21:08,548 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:21:08,548 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [603034409] [2022-03-19 08:21:08,548 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [603034409] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:21:08,549 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:21:08,549 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [48] imperfect sequences [] total 48 [2022-03-19 08:21:08,549 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1131453042] [2022-03-19 08:21:08,549 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:21:08,549 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2022-03-19 08:21:08,549 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:21:08,549 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2022-03-19 08:21:08,550 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2349, Invalid=6581, Unknown=0, NotChecked=0, Total=8930 [2022-03-19 08:21:08,550 INFO L87 Difference]: Start difference. First operand 103 states and 105 transitions. Second operand has 48 states, 48 states have (on average 2.0208333333333335) internal successors, (97), 47 states have internal predecessors, (97), 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) [2022-03-19 08:21:10,981 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:21:10,981 INFO L93 Difference]: Finished difference Result 112 states and 116 transitions. [2022-03-19 08:21:10,981 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2022-03-19 08:21:10,982 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 2.0208333333333335) internal successors, (97), 47 states have internal predecessors, (97), 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 101 [2022-03-19 08:21:10,982 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:21:10,982 INFO L225 Difference]: With dead ends: 112 [2022-03-19 08:21:10,982 INFO L226 Difference]: Without dead ends: 105 [2022-03-19 08:21:10,983 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 296 GetRequests, 156 SyntacticMatches, 2 SemanticMatches, 138 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1130 ImplicationChecksByTransitivity, 57.3s TimeCoverageRelationStatistics Valid=4687, Invalid=14773, Unknown=0, NotChecked=0, Total=19460 [2022-03-19 08:21:10,984 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 53 mSDsluCounter, 177 mSDsCounter, 0 mSdLazyCounter, 4129 mSolverCounterSat, 91 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 189 SdHoareTripleChecker+Invalid, 4220 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 91 IncrementalHoareTripleChecker+Valid, 4129 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-03-19 08:21:10,984 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [53 Valid, 189 Invalid, 4220 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [91 Valid, 4129 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2022-03-19 08:21:10,984 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2022-03-19 08:21:10,992 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 105. [2022-03-19 08:21:10,992 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 105 states, 100 states have (on average 1.03) internal successors, (103), 100 states have internal predecessors, (103), 3 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) [2022-03-19 08:21:10,992 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 107 transitions. [2022-03-19 08:21:10,992 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 107 transitions. Word has length 101 [2022-03-19 08:21:10,992 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:21:10,992 INFO L478 AbstractCegarLoop]: Abstraction has 105 states and 107 transitions. [2022-03-19 08:21:10,992 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 2.0208333333333335) internal successors, (97), 47 states have internal predecessors, (97), 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) [2022-03-19 08:21:10,992 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 107 transitions. [2022-03-19 08:21:10,993 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2022-03-19 08:21:10,993 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:21:10,993 INFO L500 BasicCegarLoop]: trace histogram [46, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:21:11,019 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Forceful destruction successful, exit code 0 [2022-03-19 08:21:11,209 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable90,45 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable89 [2022-03-19 08:21:11,209 INFO L403 AbstractCegarLoop]: === Iteration 48 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:21:11,210 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:21:11,210 INFO L85 PathProgramCache]: Analyzing trace with hash -757423530, now seen corresponding path program 89 times [2022-03-19 08:21:11,210 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:21:11,210 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1982644989] [2022-03-19 08:21:11,344 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-19 08:21:11,344 INFO L85 PathProgramCache]: Analyzing trace with hash 1356564977, now seen corresponding path program 1 times [2022-03-19 08:21:11,344 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:21:11,344 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [725788599] [2022-03-19 08:21:11,344 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:21:11,345 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:21:11,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:21:11,347 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 08:21:11,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:21:11,350 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 08:21:11,350 INFO L85 PathProgramCache]: Analyzing trace with hash -757423530, now seen corresponding path program 90 times [2022-03-19 08:21:11,350 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:21:11,350 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [26814211] [2022-03-19 08:21:11,350 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:21:11,350 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:21:11,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:21:12,387 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:21:12,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:21:12,390 INFO L134 CoverageAnalysis]: Checked inductivity of 2116 backedges. 46 proven. 2070 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:21:12,390 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:21:12,390 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [26814211] [2022-03-19 08:21:12,390 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [26814211] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:21:12,390 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [171160575] [2022-03-19 08:21:12,390 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-19 08:21:12,390 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:21:12,390 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:21:12,393 INFO L229 MonitoredProcess]: Starting monitored process 46 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:21:12,393 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2022-03-19 08:21:12,451 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-03-19 08:21:12,451 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 08:21:12,452 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 9 conjunts are in the unsatisfiable core [2022-03-19 08:21:12,456 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:21:13,431 INFO L134 CoverageAnalysis]: Checked inductivity of 2116 backedges. 135 proven. 1 refuted. 0 times theorem prover too weak. 1980 trivial. 0 not checked. [2022-03-19 08:21:13,432 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:21:14,507 INFO L134 CoverageAnalysis]: Checked inductivity of 2116 backedges. 135 proven. 1 refuted. 0 times theorem prover too weak. 1980 trivial. 0 not checked. [2022-03-19 08:21:14,507 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [171160575] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:21:14,507 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:21:14,507 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 4, 7] total 56 [2022-03-19 08:21:14,508 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:21:14,508 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1982644989] [2022-03-19 08:21:14,508 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1982644989] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:21:14,508 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:21:14,508 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [49] imperfect sequences [] total 49 [2022-03-19 08:21:14,508 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [812694057] [2022-03-19 08:21:14,508 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:21:14,508 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2022-03-19 08:21:14,508 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:21:14,508 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2022-03-19 08:21:14,509 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=337, Invalid=2743, Unknown=0, NotChecked=0, Total=3080 [2022-03-19 08:21:14,509 INFO L87 Difference]: Start difference. First operand 105 states and 107 transitions. Second operand has 49 states, 49 states have (on average 2.020408163265306) internal successors, (99), 48 states have internal predecessors, (99), 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) [2022-03-19 08:21:17,590 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:21:17,590 INFO L93 Difference]: Finished difference Result 114 states and 118 transitions. [2022-03-19 08:21:17,590 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2022-03-19 08:21:17,590 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 2.020408163265306) internal successors, (99), 48 states have internal predecessors, (99), 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 103 [2022-03-19 08:21:17,591 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:21:17,591 INFO L225 Difference]: With dead ends: 114 [2022-03-19 08:21:17,591 INFO L226 Difference]: Without dead ends: 107 [2022-03-19 08:21:17,592 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 302 GetRequests, 201 SyntacticMatches, 1 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1049 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=789, Invalid=9513, Unknown=0, NotChecked=0, Total=10302 [2022-03-19 08:21:17,592 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 54 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 4116 mSolverCounterSat, 93 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 4209 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 93 IncrementalHoareTripleChecker+Valid, 4116 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-03-19 08:21:17,592 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [54 Valid, 29 Invalid, 4209 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [93 Valid, 4116 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2022-03-19 08:21:17,592 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2022-03-19 08:21:17,600 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 107. [2022-03-19 08:21:17,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 102 states have (on average 1.0294117647058822) internal successors, (105), 102 states have internal predecessors, (105), 3 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) [2022-03-19 08:21:17,601 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 109 transitions. [2022-03-19 08:21:17,601 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 109 transitions. Word has length 103 [2022-03-19 08:21:17,601 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:21:17,601 INFO L478 AbstractCegarLoop]: Abstraction has 107 states and 109 transitions. [2022-03-19 08:21:17,601 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 2.020408163265306) internal successors, (99), 48 states have internal predecessors, (99), 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) [2022-03-19 08:21:17,601 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 109 transitions. [2022-03-19 08:21:17,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2022-03-19 08:21:17,602 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:21:17,602 INFO L500 BasicCegarLoop]: trace histogram [47, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:21:17,613 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Forceful destruction successful, exit code 0 [2022-03-19 08:21:17,807 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable91,SelfDestructingSolverStorable92,46 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:21:17,808 INFO L403 AbstractCegarLoop]: === Iteration 49 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:21:17,808 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:21:17,808 INFO L85 PathProgramCache]: Analyzing trace with hash -92602253, now seen corresponding path program 91 times [2022-03-19 08:21:17,808 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:21:17,808 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [117494662] [2022-03-19 08:21:17,938 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-19 08:21:17,938 INFO L85 PathProgramCache]: Analyzing trace with hash 1415670321, now seen corresponding path program 1 times [2022-03-19 08:21:17,938 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:21:17,939 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [150210516] [2022-03-19 08:21:17,939 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:21:17,939 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:21:17,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:21:17,942 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 08:21:17,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:21:17,944 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 08:21:17,944 INFO L85 PathProgramCache]: Analyzing trace with hash -92602253, now seen corresponding path program 92 times [2022-03-19 08:21:17,944 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:21:17,945 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1284770341] [2022-03-19 08:21:17,945 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:21:17,945 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:21:17,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:21:18,989 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:21:18,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:21:18,991 INFO L134 CoverageAnalysis]: Checked inductivity of 2209 backedges. 47 proven. 2162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:21:18,991 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:21:18,991 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1284770341] [2022-03-19 08:21:18,992 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1284770341] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:21:18,992 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2107954251] [2022-03-19 08:21:18,992 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-19 08:21:18,992 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:21:18,992 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:21:18,993 INFO L229 MonitoredProcess]: Starting monitored process 47 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:21:18,993 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2022-03-19 08:21:19,053 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-19 08:21:19,053 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 08:21:19,055 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 100 conjunts are in the unsatisfiable core [2022-03-19 08:21:19,058 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:21:19,404 INFO L134 CoverageAnalysis]: Checked inductivity of 2209 backedges. 0 proven. 2209 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:21:19,404 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:21:58,824 INFO L134 CoverageAnalysis]: Checked inductivity of 2209 backedges. 0 proven. 2209 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:21:58,825 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2107954251] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:21:58,825 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:21:58,825 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 53] total 103 [2022-03-19 08:21:58,825 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:21:58,825 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [117494662] [2022-03-19 08:21:58,825 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [117494662] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:21:58,825 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:21:58,825 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [50] imperfect sequences [] total 50 [2022-03-19 08:21:58,825 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1796233173] [2022-03-19 08:21:58,825 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:21:58,826 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2022-03-19 08:21:58,826 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:21:58,826 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2022-03-19 08:21:58,827 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2603, Invalid=7903, Unknown=0, NotChecked=0, Total=10506 [2022-03-19 08:21:58,827 INFO L87 Difference]: Start difference. First operand 107 states and 109 transitions. Second operand has 50 states, 50 states have (on average 2.02) internal successors, (101), 49 states have internal predecessors, (101), 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) [2022-03-19 08:22:02,194 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:22:02,195 INFO L93 Difference]: Finished difference Result 116 states and 120 transitions. [2022-03-19 08:22:02,195 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2022-03-19 08:22:02,195 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 2.02) internal successors, (101), 49 states have internal predecessors, (101), 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 105 [2022-03-19 08:22:02,195 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:22:02,196 INFO L225 Difference]: With dead ends: 116 [2022-03-19 08:22:02,196 INFO L226 Difference]: Without dead ends: 109 [2022-03-19 08:22:02,197 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 308 GetRequests, 158 SyntacticMatches, 2 SemanticMatches, 148 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1236 ImplicationChecksByTransitivity, 40.2s TimeCoverageRelationStatistics Valid=5139, Invalid=17211, Unknown=0, NotChecked=0, Total=22350 [2022-03-19 08:22:02,198 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 55 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 4305 mSolverCounterSat, 95 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 4400 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 95 IncrementalHoareTripleChecker+Valid, 4305 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2022-03-19 08:22:02,198 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [55 Valid, 34 Invalid, 4400 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [95 Valid, 4305 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2022-03-19 08:22:02,198 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2022-03-19 08:22:02,206 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 109. [2022-03-19 08:22:02,207 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109 states, 104 states have (on average 1.0288461538461537) internal successors, (107), 104 states have internal predecessors, (107), 3 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) [2022-03-19 08:22:02,207 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 111 transitions. [2022-03-19 08:22:02,207 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 111 transitions. Word has length 105 [2022-03-19 08:22:02,207 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:22:02,207 INFO L478 AbstractCegarLoop]: Abstraction has 109 states and 111 transitions. [2022-03-19 08:22:02,207 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 2.02) internal successors, (101), 49 states have internal predecessors, (101), 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) [2022-03-19 08:22:02,208 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 111 transitions. [2022-03-19 08:22:02,208 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2022-03-19 08:22:02,208 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:22:02,208 INFO L500 BasicCegarLoop]: trace histogram [48, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:22:02,226 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Forceful destruction successful, exit code 0 [2022-03-19 08:22:02,423 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable93,SelfDestructingSolverStorable94,47 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:22:02,423 INFO L403 AbstractCegarLoop]: === Iteration 50 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:22:02,423 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:22:02,424 INFO L85 PathProgramCache]: Analyzing trace with hash -1149482160, now seen corresponding path program 93 times [2022-03-19 08:22:02,424 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:22:02,424 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [752590375] [2022-03-19 08:22:02,536 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-19 08:22:02,537 INFO L85 PathProgramCache]: Analyzing trace with hash 1474775665, now seen corresponding path program 1 times [2022-03-19 08:22:02,537 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:22:02,537 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [975588373] [2022-03-19 08:22:02,537 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:22:02,537 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:22:02,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:22:02,540 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 08:22:02,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:22:02,542 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 08:22:02,542 INFO L85 PathProgramCache]: Analyzing trace with hash -1149482160, now seen corresponding path program 94 times [2022-03-19 08:22:02,542 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:22:02,542 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1975487700] [2022-03-19 08:22:02,542 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:22:02,542 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:22:02,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:03,685 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:22:03,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:22:03,688 INFO L134 CoverageAnalysis]: Checked inductivity of 2304 backedges. 48 proven. 2256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:22:03,688 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:22:03,688 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1975487700] [2022-03-19 08:22:03,688 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1975487700] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:22:03,688 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1464079349] [2022-03-19 08:22:03,689 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-19 08:22:03,689 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:22:03,689 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:22:03,690 INFO L229 MonitoredProcess]: Starting monitored process 48 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:22:03,690 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Waiting until timeout for monitored process [2022-03-19 08:22:03,813 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-19 08:22:03,813 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 08:22:03,815 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 99 conjunts are in the unsatisfiable core [2022-03-19 08:22:03,817 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:22:04,236 INFO L134 CoverageAnalysis]: Checked inductivity of 2304 backedges. 0 proven. 2304 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:22:04,237 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:24:15,486 INFO L134 CoverageAnalysis]: Checked inductivity of 2304 backedges. 0 proven. 2304 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:24:15,487 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1464079349] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:24:15,487 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:24:15,487 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 102 [2022-03-19 08:24:15,487 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:24:15,487 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [752590375] [2022-03-19 08:24:15,487 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [752590375] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:24:15,488 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:24:15,488 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [51] imperfect sequences [] total 51 [2022-03-19 08:24:15,488 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [970534976] [2022-03-19 08:24:15,488 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:24:15,488 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2022-03-19 08:24:15,488 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:24:15,491 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2022-03-19 08:24:15,492 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2699, Invalid=7603, Unknown=0, NotChecked=0, Total=10302 [2022-03-19 08:24:15,492 INFO L87 Difference]: Start difference. First operand 109 states and 111 transitions. Second operand has 51 states, 51 states have (on average 2.019607843137255) internal successors, (103), 50 states have internal predecessors, (103), 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) [2022-03-19 08:24:18,326 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:24:18,326 INFO L93 Difference]: Finished difference Result 118 states and 122 transitions. [2022-03-19 08:24:18,326 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2022-03-19 08:24:18,326 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 2.019607843137255) internal successors, (103), 50 states have internal predecessors, (103), 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 107 [2022-03-19 08:24:18,327 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:24:18,327 INFO L225 Difference]: With dead ends: 118 [2022-03-19 08:24:18,327 INFO L226 Difference]: Without dead ends: 111 [2022-03-19 08:24:18,328 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 314 GetRequests, 164 SyntacticMatches, 2 SemanticMatches, 148 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1232 ImplicationChecksByTransitivity, 129.9s TimeCoverageRelationStatistics Valid=5337, Invalid=17013, Unknown=0, NotChecked=0, Total=22350 [2022-03-19 08:24:18,328 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 56 mSDsluCounter, 132 mSDsCounter, 0 mSdLazyCounter, 4624 mSolverCounterSat, 97 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 144 SdHoareTripleChecker+Invalid, 4721 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 97 IncrementalHoareTripleChecker+Valid, 4624 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2022-03-19 08:24:18,328 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [56 Valid, 144 Invalid, 4721 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [97 Valid, 4624 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2022-03-19 08:24:18,329 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2022-03-19 08:24:18,339 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 111. [2022-03-19 08:24:18,339 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 106 states have (on average 1.028301886792453) internal successors, (109), 106 states have internal predecessors, (109), 3 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) [2022-03-19 08:24:18,339 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 113 transitions. [2022-03-19 08:24:18,339 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 113 transitions. Word has length 107 [2022-03-19 08:24:18,340 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:24:18,340 INFO L478 AbstractCegarLoop]: Abstraction has 111 states and 113 transitions. [2022-03-19 08:24:18,340 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 2.019607843137255) internal successors, (103), 50 states have internal predecessors, (103), 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) [2022-03-19 08:24:18,340 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 113 transitions. [2022-03-19 08:24:18,340 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2022-03-19 08:24:18,340 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:24:18,341 INFO L500 BasicCegarLoop]: trace histogram [49, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:24:18,361 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Forceful destruction successful, exit code 0 [2022-03-19 08:24:18,550 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable95,SelfDestructingSolverStorable96,48 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:24:18,550 INFO L403 AbstractCegarLoop]: === Iteration 51 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:24:18,551 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:24:18,551 INFO L85 PathProgramCache]: Analyzing trace with hash 1096176365, now seen corresponding path program 95 times [2022-03-19 08:24:18,551 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:24:18,551 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1022241877] [2022-03-19 08:24:18,670 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-19 08:24:18,671 INFO L85 PathProgramCache]: Analyzing trace with hash 1533881009, now seen corresponding path program 1 times [2022-03-19 08:24:18,671 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:24:18,671 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1820897137] [2022-03-19 08:24:18,671 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:24:18,671 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:24:18,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:24:18,674 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 08:24:18,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:24:18,677 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 08:24:18,677 INFO L85 PathProgramCache]: Analyzing trace with hash 1096176365, now seen corresponding path program 96 times [2022-03-19 08:24:18,677 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:24:18,677 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1848210788] [2022-03-19 08:24:18,677 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:24:18,678 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:24:18,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:24:19,845 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:24:19,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:24:19,852 INFO L134 CoverageAnalysis]: Checked inductivity of 2401 backedges. 49 proven. 2352 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:24:19,852 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:24:19,852 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1848210788] [2022-03-19 08:24:19,853 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1848210788] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:24:19,853 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [945887772] [2022-03-19 08:24:19,853 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE [2022-03-19 08:24:19,853 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:24:19,853 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:24:19,854 INFO L229 MonitoredProcess]: Starting monitored process 49 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:24:19,855 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Waiting until timeout for monitored process [2022-03-19 08:24:19,905 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2022-03-19 08:24:19,905 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 08:24:19,906 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 9 conjunts are in the unsatisfiable core [2022-03-19 08:24:19,907 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:24:24,825 INFO L134 CoverageAnalysis]: Checked inductivity of 2401 backedges. 144 proven. 1 refuted. 0 times theorem prover too weak. 2256 trivial. 0 not checked. [2022-03-19 08:24:24,826 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:24:28,386 INFO L134 CoverageAnalysis]: Checked inductivity of 2401 backedges. 144 proven. 1 refuted. 0 times theorem prover too weak. 2256 trivial. 0 not checked. [2022-03-19 08:24:28,386 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [945887772] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:24:28,387 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:24:28,387 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 4, 7] total 59 [2022-03-19 08:24:28,387 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:24:28,387 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1022241877] [2022-03-19 08:24:28,387 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1022241877] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:24:28,387 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:24:28,387 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [52] imperfect sequences [] total 52 [2022-03-19 08:24:28,387 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [976092211] [2022-03-19 08:24:28,387 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:24:28,387 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2022-03-19 08:24:28,387 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:24:28,388 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2022-03-19 08:24:28,388 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=358, Invalid=3064, Unknown=0, NotChecked=0, Total=3422 [2022-03-19 08:24:28,388 INFO L87 Difference]: Start difference. First operand 111 states and 113 transitions. Second operand has 52 states, 52 states have (on average 2.019230769230769) internal successors, (105), 51 states have internal predecessors, (105), 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) [2022-03-19 08:24:32,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:24:32,549 INFO L93 Difference]: Finished difference Result 120 states and 124 transitions. [2022-03-19 08:24:32,549 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2022-03-19 08:24:32,550 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 2.019230769230769) internal successors, (105), 51 states have internal predecessors, (105), 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 109 [2022-03-19 08:24:32,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:24:32,550 INFO L225 Difference]: With dead ends: 120 [2022-03-19 08:24:32,550 INFO L226 Difference]: Without dead ends: 113 [2022-03-19 08:24:32,551 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 320 GetRequests, 213 SyntacticMatches, 1 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1190 ImplicationChecksByTransitivity, 11.4s TimeCoverageRelationStatistics Valid=840, Invalid=10716, Unknown=0, NotChecked=0, Total=11556 [2022-03-19 08:24:32,551 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 57 mSDsluCounter, 237 mSDsCounter, 0 mSdLazyCounter, 4941 mSolverCounterSat, 99 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 249 SdHoareTripleChecker+Invalid, 5040 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 99 IncrementalHoareTripleChecker+Valid, 4941 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2022-03-19 08:24:32,551 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [57 Valid, 249 Invalid, 5040 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [99 Valid, 4941 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2022-03-19 08:24:32,552 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2022-03-19 08:24:32,560 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 113. [2022-03-19 08:24:32,560 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 113 states, 108 states have (on average 1.0277777777777777) internal successors, (111), 108 states have internal predecessors, (111), 3 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) [2022-03-19 08:24:32,560 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 115 transitions. [2022-03-19 08:24:32,561 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 115 transitions. Word has length 109 [2022-03-19 08:24:32,561 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:24:32,561 INFO L478 AbstractCegarLoop]: Abstraction has 113 states and 115 transitions. [2022-03-19 08:24:32,561 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 2.019230769230769) internal successors, (105), 51 states have internal predecessors, (105), 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) [2022-03-19 08:24:32,561 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 115 transitions. [2022-03-19 08:24:32,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2022-03-19 08:24:32,561 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:24:32,561 INFO L500 BasicCegarLoop]: trace histogram [50, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:24:32,571 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Forceful destruction successful, exit code 0 [2022-03-19 08:24:32,765 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable97,49 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable98 [2022-03-19 08:24:32,765 INFO L403 AbstractCegarLoop]: === Iteration 52 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:24:32,765 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:24:32,765 INFO L85 PathProgramCache]: Analyzing trace with hash -1194530998, now seen corresponding path program 97 times [2022-03-19 08:24:32,765 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:24:32,765 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [1920700778] [2022-03-19 08:24:32,880 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-19 08:24:32,880 INFO L85 PathProgramCache]: Analyzing trace with hash 1592986353, now seen corresponding path program 1 times [2022-03-19 08:24:32,880 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:24:32,880 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [884059144] [2022-03-19 08:24:32,880 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:24:32,880 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:24:32,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:24:32,883 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 08:24:32,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:24:32,885 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 08:24:32,886 INFO L85 PathProgramCache]: Analyzing trace with hash -1194530998, now seen corresponding path program 98 times [2022-03-19 08:24:32,886 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:24:32,886 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1799336426] [2022-03-19 08:24:32,886 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:24:32,886 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:24:32,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:24:34,057 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:24:34,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:24:34,061 INFO L134 CoverageAnalysis]: Checked inductivity of 2500 backedges. 50 proven. 2450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:24:34,062 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:24:34,062 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1799336426] [2022-03-19 08:24:34,062 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1799336426] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:24:34,062 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1020230852] [2022-03-19 08:24:34,062 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2022-03-19 08:24:34,062 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:24:34,062 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:24:34,063 INFO L229 MonitoredProcess]: Starting monitored process 50 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:24:34,063 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Waiting until timeout for monitored process [2022-03-19 08:24:34,161 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2022-03-19 08:24:34,161 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 08:24:34,163 INFO L263 TraceCheckSpWp]: Trace formula consists of 251 conjuncts, 106 conjunts are in the unsatisfiable core [2022-03-19 08:24:34,164 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:24:34,528 INFO L134 CoverageAnalysis]: Checked inductivity of 2500 backedges. 0 proven. 2500 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:24:34,528 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-03-19 08:25:30,024 INFO L134 CoverageAnalysis]: Checked inductivity of 2500 backedges. 0 proven. 2500 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:25:30,024 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1020230852] provided 0 perfect and 2 imperfect interpolant sequences [2022-03-19 08:25:30,024 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-03-19 08:25:30,024 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 56] total 109 [2022-03-19 08:25:30,025 INFO L136 FreeRefinementEngine]: Strategy ACCELERATED_INTERPOLATION found an infeasible trace [2022-03-19 08:25:30,025 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAcceleratedInterpolation [1920700778] [2022-03-19 08:25:30,025 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleAcceleratedInterpolation [1920700778] provided 1 perfect and 0 imperfect interpolant sequences [2022-03-19 08:25:30,025 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-03-19 08:25:30,025 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [53] imperfect sequences [] total 53 [2022-03-19 08:25:30,025 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [845502897] [2022-03-19 08:25:30,025 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-03-19 08:25:30,025 INFO L554 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2022-03-19 08:25:30,025 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy ACCELERATED_INTERPOLATION [2022-03-19 08:25:30,025 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2022-03-19 08:25:30,026 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2918, Invalid=8854, Unknown=0, NotChecked=0, Total=11772 [2022-03-19 08:25:30,026 INFO L87 Difference]: Start difference. First operand 113 states and 115 transitions. Second operand has 53 states, 53 states have (on average 2.018867924528302) internal successors, (107), 52 states have internal predecessors, (107), 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) [2022-03-19 08:25:33,988 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-03-19 08:25:33,988 INFO L93 Difference]: Finished difference Result 122 states and 126 transitions. [2022-03-19 08:25:33,989 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2022-03-19 08:25:33,989 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 2.018867924528302) internal successors, (107), 52 states have internal predecessors, (107), 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 111 [2022-03-19 08:25:33,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-03-19 08:25:33,989 INFO L225 Difference]: With dead ends: 122 [2022-03-19 08:25:33,989 INFO L226 Difference]: Without dead ends: 115 [2022-03-19 08:25:33,990 INFO L911 BasicCegarLoop]: 0 DeclaredPredicates, 326 GetRequests, 167 SyntacticMatches, 2 SemanticMatches, 157 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1389 ImplicationChecksByTransitivity, 56.4s TimeCoverageRelationStatistics Valid=5766, Invalid=19356, Unknown=0, NotChecked=0, Total=25122 [2022-03-19 08:25:33,991 INFO L912 BasicCegarLoop]: 12 mSDtfsCounter, 58 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 4896 mSolverCounterSat, 101 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 4997 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 101 IncrementalHoareTripleChecker+Valid, 4896 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2022-03-19 08:25:33,991 INFO L913 BasicCegarLoop]: SdHoareTripleChecker [58 Valid, 49 Invalid, 4997 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [101 Valid, 4896 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2022-03-19 08:25:33,991 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2022-03-19 08:25:34,000 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 115. [2022-03-19 08:25:34,000 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 110 states have (on average 1.0272727272727273) internal successors, (113), 110 states have internal predecessors, (113), 3 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) [2022-03-19 08:25:34,000 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 117 transitions. [2022-03-19 08:25:34,000 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 117 transitions. Word has length 111 [2022-03-19 08:25:34,000 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-03-19 08:25:34,000 INFO L478 AbstractCegarLoop]: Abstraction has 115 states and 117 transitions. [2022-03-19 08:25:34,001 INFO L479 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 2.018867924528302) internal successors, (107), 52 states have internal predecessors, (107), 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) [2022-03-19 08:25:34,001 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 117 transitions. [2022-03-19 08:25:34,001 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2022-03-19 08:25:34,001 INFO L492 BasicCegarLoop]: Found error trace [2022-03-19 08:25:34,001 INFO L500 BasicCegarLoop]: trace histogram [51, 50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-03-19 08:25:34,018 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Forceful destruction successful, exit code 0 [2022-03-19 08:25:34,218 WARN L460 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable99,SelfDestructingSolverStorable100 [2022-03-19 08:25:34,218 INFO L403 AbstractCegarLoop]: === Iteration 53 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-03-19 08:25:34,219 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-03-19 08:25:34,219 INFO L85 PathProgramCache]: Analyzing trace with hash 753916007, now seen corresponding path program 99 times [2022-03-19 08:25:34,219 INFO L118 FreeRefinementEngine]: Executing refinement strategy ACCELERATED_INTERPOLATION [2022-03-19 08:25:34,219 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleAcceleratedInterpolation [2105664084] [2022-03-19 08:25:34,347 INFO L271 tedInterpolationCore]: Starting analysis with loop acceleration approximation OVERAPPROXIMATION [2022-03-19 08:25:34,348 INFO L85 PathProgramCache]: Analyzing trace with hash 1652091697, now seen corresponding path program 1 times [2022-03-19 08:25:34,348 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:25:34,348 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1067943369] [2022-03-19 08:25:34,348 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:25:34,348 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:25:34,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:25:34,351 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-03-19 08:25:34,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-03-19 08:25:34,357 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-03-19 08:25:34,357 INFO L85 PathProgramCache]: Analyzing trace with hash 753916007, now seen corresponding path program 100 times [2022-03-19 08:25:34,357 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-03-19 08:25:34,358 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [865542695] [2022-03-19 08:25:34,358 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-03-19 08:25:34,358 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-03-19 08:25:34,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:25:35,665 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-03-19 08:25:35,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-03-19 08:25:35,668 INFO L134 CoverageAnalysis]: Checked inductivity of 2601 backedges. 51 proven. 2550 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:25:35,668 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-03-19 08:25:35,668 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [865542695] [2022-03-19 08:25:35,668 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [865542695] provided 0 perfect and 1 imperfect interpolant sequences [2022-03-19 08:25:35,668 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [572762390] [2022-03-19 08:25:35,668 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-03-19 08:25:35,668 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-03-19 08:25:35,668 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-03-19 08:25:35,669 INFO L229 MonitoredProcess]: Starting monitored process 51 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-03-19 08:25:35,670 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Waiting until timeout for monitored process [2022-03-19 08:25:35,798 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-03-19 08:25:35,798 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-03-19 08:25:35,800 INFO L263 TraceCheckSpWp]: Trace formula consists of 255 conjuncts, 105 conjunts are in the unsatisfiable core [2022-03-19 08:25:35,808 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-03-19 08:25:36,191 INFO L134 CoverageAnalysis]: Checked inductivity of 2601 backedges. 0 proven. 2601 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-03-19 08:25:36,191 INFO L328 TraceCheckSpWp]: Computing backward predicates...