/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf -i ../../../trunk/examples/svcomp/loop-lit/gj2007.i -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-d966a43 [2022-01-31 20:59:59,770 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-01-31 20:59:59,772 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-01-31 20:59:59,814 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-01-31 20:59:59,860 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-01-31 20:59:59,860 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-01-31 20:59:59,860 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-01-31 20:59:59,861 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf [2022-01-31 20:59:59,872 INFO L113 SettingsManager]: Loading preferences was successful [2022-01-31 20:59:59,872 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-01-31 20:59:59,874 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-01-31 20:59:59,874 INFO L138 SettingsManager]: * sizeof long=4 [2022-01-31 20:59:59,874 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-01-31 20:59:59,874 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-01-31 20:59:59,874 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-01-31 20:59:59,874 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-01-31 20:59:59,874 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-01-31 20:59:59,874 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-01-31 20:59:59,875 INFO L138 SettingsManager]: * sizeof long double=12 [2022-01-31 20:59:59,875 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-01-31 20:59:59,875 INFO L138 SettingsManager]: * Use constant arrays=true [2022-01-31 20:59:59,875 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-01-31 20:59:59,875 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-01-31 20:59:59,875 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-01-31 20:59:59,876 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-01-31 20:59:59,876 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-01-31 20:59:59,876 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-01-31 20:59:59,876 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-01-31 20:59:59,876 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2022-01-31 20:59:59,876 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-01-31 20:59:59,876 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2022-01-31 20:59:59,876 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-01-31 21:00:00,069 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-01-31 21:00:00,095 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-01-31 21:00:00,097 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-01-31 21:00:00,097 INFO L271 PluginConnector]: Initializing CDTParser... [2022-01-31 21:00:00,101 INFO L275 PluginConnector]: CDTParser initialized [2022-01-31 21:00:00,102 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/gj2007.i [2022-01-31 21:00:00,150 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/04fee4fe3/24fcfe745f2644309e893dc512223972/FLAG86637635f [2022-01-31 21:00:00,490 INFO L306 CDTParser]: Found 1 translation units. [2022-01-31 21:00:00,490 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-lit/gj2007.i [2022-01-31 21:00:00,498 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/04fee4fe3/24fcfe745f2644309e893dc512223972/FLAG86637635f [2022-01-31 21:00:00,509 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/04fee4fe3/24fcfe745f2644309e893dc512223972 [2022-01-31 21:00:00,511 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-01-31 21:00:00,512 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-01-31 21:00:00,513 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-01-31 21:00:00,513 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-01-31 21:00:00,521 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-01-31 21:00:00,521 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 31.01 09:00:00" (1/1) ... [2022-01-31 21:00:00,522 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@192bc34c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 09:00:00, skipping insertion in model container [2022-01-31 21:00:00,522 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 31.01 09:00:00" (1/1) ... [2022-01-31 21:00:00,527 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-01-31 21:00:00,538 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-01-31 21:00:00,663 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-lit/gj2007.i[895,908] [2022-01-31 21:00:00,674 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-01-31 21:00:00,679 INFO L203 MainTranslator]: Completed pre-run [2022-01-31 21:00:00,716 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-lit/gj2007.i[895,908] [2022-01-31 21:00:00,717 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-01-31 21:00:00,726 INFO L208 MainTranslator]: Completed translation [2022-01-31 21:00:00,726 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 09:00:00 WrapperNode [2022-01-31 21:00:00,726 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-01-31 21:00:00,727 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-01-31 21:00:00,727 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-01-31 21:00:00,727 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-01-31 21:00:00,734 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 09:00:00" (1/1) ... [2022-01-31 21:00:00,734 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 09:00:00" (1/1) ... [2022-01-31 21:00:00,738 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 09:00:00" (1/1) ... [2022-01-31 21:00:00,739 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 09:00:00" (1/1) ... [2022-01-31 21:00:00,742 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 09:00:00" (1/1) ... [2022-01-31 21:00:00,746 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 09:00:00" (1/1) ... [2022-01-31 21:00:00,751 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 09:00:00" (1/1) ... [2022-01-31 21:00:00,757 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-01-31 21:00:00,757 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-01-31 21:00:00,757 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-01-31 21:00:00,758 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-01-31 21:00:00,758 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 09:00:00" (1/1) ... [2022-01-31 21:00:00,763 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-01-31 21:00:00,770 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-01-31 21:00:00,780 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) [2022-01-31 21:00:00,784 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 [2022-01-31 21:00:00,820 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-01-31 21:00:00,820 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-01-31 21:00:00,820 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-01-31 21:00:00,821 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-01-31 21:00:00,821 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-01-31 21:00:00,821 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-01-31 21:00:00,821 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-01-31 21:00:00,821 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-01-31 21:00:00,821 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2022-01-31 21:00:00,821 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2022-01-31 21:00:00,821 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-01-31 21:00:00,821 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-01-31 21:00:00,821 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-01-31 21:00:00,822 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-01-31 21:00:00,822 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2022-01-31 21:00:00,822 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-01-31 21:00:00,822 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-01-31 21:00:00,822 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-01-31 21:00:00,823 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-01-31 21:00:00,823 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-01-31 21:00:00,823 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-01-31 21:00:00,823 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-01-31 21:00:00,899 INFO L234 CfgBuilder]: Building ICFG [2022-01-31 21:00:00,903 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-01-31 21:00:01,042 INFO L275 CfgBuilder]: Performing block encoding [2022-01-31 21:00:01,046 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-01-31 21:00:01,047 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2022-01-31 21:00:01,048 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.01 09:00:01 BoogieIcfgContainer [2022-01-31 21:00:01,048 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-01-31 21:00:01,049 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-01-31 21:00:01,049 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-01-31 21:00:01,053 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-01-31 21:00:01,053 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 31.01 09:00:00" (1/3) ... [2022-01-31 21:00:01,053 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@75a57622 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 31.01 09:00:01, skipping insertion in model container [2022-01-31 21:00:01,053 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.01 09:00:00" (2/3) ... [2022-01-31 21:00:01,054 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@75a57622 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 31.01 09:00:01, skipping insertion in model container [2022-01-31 21:00:01,054 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.01 09:00:01" (3/3) ... [2022-01-31 21:00:01,071 INFO L111 eAbstractionObserver]: Analyzing ICFG gj2007.i [2022-01-31 21:00:01,074 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-01-31 21:00:01,075 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-01-31 21:00:01,137 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-01-31 21:00:01,142 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=AcceleratedInterpolation, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=JORDAN [2022-01-31 21:00:01,142 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-01-31 21:00:01,171 INFO L276 IsEmpty]: Start isEmpty. Operand has 20 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 13 states have internal predecessors, (17), 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) [2022-01-31 21:00:01,176 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-01-31 21:00:01,176 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:00:01,176 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:00:01,177 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:00:01,181 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:00:01,181 INFO L85 PathProgramCache]: Analyzing trace with hash -242008288, now seen corresponding path program 1 times [2022-01-31 21:00:01,191 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:00:01,192 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [706492713] [2022-01-31 21:00:01,192 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:00:01,202 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:00:01,241 INFO L248 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-01-31 21:00:01,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:01,335 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:00:01,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:01,352 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:00:01,354 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:00:01,355 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [706492713] [2022-01-31 21:00:01,356 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [706492713] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:00:01,356 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:00:01,356 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-01-31 21:00:01,357 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1708989432] [2022-01-31 21:00:01,358 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:00:01,360 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-01-31 21:00:01,361 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:00:01,382 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-01-31 21:00:01,382 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-01-31 21:00:01,384 INFO L87 Difference]: Start difference. First operand has 20 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 13 states have internal predecessors, (17), 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) [2022-01-31 21:00:01,423 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:00:01,423 INFO L93 Difference]: Finished difference Result 32 states and 36 transitions. [2022-01-31 21:00:01,425 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-01-31 21:00:01,426 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 [2022-01-31 21:00:01,426 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:00:01,430 INFO L225 Difference]: With dead ends: 32 [2022-01-31 21:00:01,430 INFO L226 Difference]: Without dead ends: 13 [2022-01-31 21:00:01,433 INFO L932 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 [2022-01-31 21:00:01,436 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 12 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 23 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 [2022-01-31 21:00:01,437 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 23 Invalid, 5 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-01-31 21:00:01,447 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2022-01-31 21:00:01,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2022-01-31 21:00:01,459 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) [2022-01-31 21:00:01,460 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2022-01-31 21:00:01,461 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 11 [2022-01-31 21:00:01,461 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:00:01,461 INFO L470 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2022-01-31 21:00:01,461 INFO L471 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) [2022-01-31 21:00:01,462 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2022-01-31 21:00:01,462 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-01-31 21:00:01,462 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:00:01,462 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:00:01,463 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-01-31 21:00:01,463 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:00:01,464 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:00:01,464 INFO L85 PathProgramCache]: Analyzing trace with hash -251243498, now seen corresponding path program 1 times [2022-01-31 21:00:01,464 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:00:01,464 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1475307558] [2022-01-31 21:00:01,464 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:00:01,465 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:00:01,468 INFO L248 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-01-31 21:00:01,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:01,524 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:00:01,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:01,543 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:00:01,543 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:00:01,543 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1475307558] [2022-01-31 21:00:01,543 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1475307558] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:00:01,544 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:00:01,544 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-01-31 21:00:01,544 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [615093342] [2022-01-31 21:00:01,544 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:00:01,546 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-01-31 21:00:01,546 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:00:01,546 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-01-31 21:00:01,546 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-01-31 21:00:01,547 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) [2022-01-31 21:00:01,579 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:00:01,579 INFO L93 Difference]: Finished difference Result 22 states and 26 transitions. [2022-01-31 21:00:01,580 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-01-31 21:00:01,580 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 [2022-01-31 21:00:01,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:00:01,581 INFO L225 Difference]: With dead ends: 22 [2022-01-31 21:00:01,581 INFO L226 Difference]: Without dead ends: 15 [2022-01-31 21:00:01,581 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-01-31 21:00:01,582 INFO L933 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 [2022-01-31 21:00:01,582 INFO L934 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] [2022-01-31 21:00:01,583 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2022-01-31 21:00:01,585 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2022-01-31 21:00:01,585 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) [2022-01-31 21:00:01,586 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2022-01-31 21:00:01,586 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 11 [2022-01-31 21:00:01,586 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:00:01,586 INFO L470 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2022-01-31 21:00:01,586 INFO L471 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) [2022-01-31 21:00:01,586 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2022-01-31 21:00:01,587 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-01-31 21:00:01,587 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:00:01,587 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:00:01,587 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-01-31 21:00:01,587 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:00:01,587 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:00:01,588 INFO L85 PathProgramCache]: Analyzing trace with hash 85580979, now seen corresponding path program 1 times [2022-01-31 21:00:01,588 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:00:01,588 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2066938489] [2022-01-31 21:00:01,588 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:00:01,687 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:01,688 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-01-31 21:00:01,688 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:00:01,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:01,746 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:00:01,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:01,756 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:00:01,813 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:00:01,814 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2066938489] [2022-01-31 21:00:01,814 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [2066938489] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:00:01,815 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:00:01,815 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-01-31 21:00:01,815 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1620419468] [2022-01-31 21:00:01,815 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:00:01,816 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-01-31 21:00:01,816 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:00:01,816 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-01-31 21:00:01,816 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2022-01-31 21:00:01,817 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) [2022-01-31 21:00:01,876 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:00:01,877 INFO L93 Difference]: Finished difference Result 22 states and 24 transitions. [2022-01-31 21:00:01,877 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-01-31 21:00:01,877 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 [2022-01-31 21:00:01,878 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:00:01,878 INFO L225 Difference]: With dead ends: 22 [2022-01-31 21:00:01,878 INFO L226 Difference]: Without dead ends: 17 [2022-01-31 21:00:01,879 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 7 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2022-01-31 21:00:01,883 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 10 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-01-31 21:00:01,883 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 23 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-01-31 21:00:01,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2022-01-31 21:00:01,886 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2022-01-31 21:00:01,886 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) [2022-01-31 21:00:01,886 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2022-01-31 21:00:01,886 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 13 [2022-01-31 21:00:01,887 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:00:01,887 INFO L470 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2022-01-31 21:00:01,887 INFO L471 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) [2022-01-31 21:00:01,887 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2022-01-31 21:00:01,887 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-01-31 21:00:01,887 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:00:01,887 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:00:01,887 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-01-31 21:00:01,888 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:00:01,888 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:00:01,888 INFO L85 PathProgramCache]: Analyzing trace with hash 1708614478, now seen corresponding path program 1 times [2022-01-31 21:00:01,888 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:00:01,888 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1773572349] [2022-01-31 21:00:01,888 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:00:01,912 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:02,015 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:02,018 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:02,057 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:02,057 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:02,057 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:00:02,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:02,167 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:00:02,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:02,179 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:00:02,269 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:00:02,269 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1773572349] [2022-01-31 21:00:02,269 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1773572349] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:00:02,269 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:00:02,269 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-01-31 21:00:02,269 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1166102199] [2022-01-31 21:00:02,269 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:00:02,270 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-01-31 21:00:02,270 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:00:02,270 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-01-31 21:00:02,270 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2022-01-31 21:00:02,271 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand has 9 states, 8 states have (on average 1.375) internal successors, (11), 7 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) [2022-01-31 21:00:02,350 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:00:02,351 INFO L93 Difference]: Finished difference Result 26 states and 31 transitions. [2022-01-31 21:00:02,351 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-01-31 21:00:02,351 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 1.375) internal successors, (11), 7 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 [2022-01-31 21:00:02,351 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:00:02,352 INFO L225 Difference]: With dead ends: 26 [2022-01-31 21:00:02,352 INFO L226 Difference]: Without dead ends: 19 [2022-01-31 21:00:02,352 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=51, Invalid=159, Unknown=0, NotChecked=0, Total=210 [2022-01-31 21:00:02,353 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 11 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 69 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 77 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 69 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-01-31 21:00:02,353 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 38 Invalid, 77 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 69 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-01-31 21:00:02,353 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2022-01-31 21:00:02,356 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2022-01-31 21:00:02,356 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) [2022-01-31 21:00:02,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2022-01-31 21:00:02,356 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 15 [2022-01-31 21:00:02,357 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:00:02,357 INFO L470 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2022-01-31 21:00:02,357 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 1.375) internal successors, (11), 7 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) [2022-01-31 21:00:02,357 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2022-01-31 21:00:02,357 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-01-31 21:00:02,357 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:00:02,357 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:00:02,357 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-01-31 21:00:02,358 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:00:02,358 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:00:02,358 INFO L85 PathProgramCache]: Analyzing trace with hash -1924288727, now seen corresponding path program 2 times [2022-01-31 21:00:02,358 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:00:02,358 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [808335491] [2022-01-31 21:00:02,358 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:00:02,388 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:02,451 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:02,451 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:02,494 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:02,521 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:02,521 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:02,522 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:00:02,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:02,608 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:00:02,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:02,612 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:00:02,709 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:00:02,709 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [808335491] [2022-01-31 21:00:02,709 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [808335491] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:00:02,709 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:00:02,709 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2022-01-31 21:00:02,710 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1914450847] [2022-01-31 21:00:02,710 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:00:02,710 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-01-31 21:00:02,710 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:00:02,710 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-01-31 21:00:02,710 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2022-01-31 21:00:02,711 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand has 10 states, 9 states have (on average 1.4444444444444444) internal successors, (13), 8 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) [2022-01-31 21:00:02,865 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:00:02,865 INFO L93 Difference]: Finished difference Result 28 states and 33 transitions. [2022-01-31 21:00:02,869 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-01-31 21:00:02,870 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 1.4444444444444444) internal successors, (13), 8 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 [2022-01-31 21:00:02,870 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:00:02,870 INFO L225 Difference]: With dead ends: 28 [2022-01-31 21:00:02,870 INFO L226 Difference]: Without dead ends: 21 [2022-01-31 21:00:02,871 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 6 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=59, Invalid=213, Unknown=0, NotChecked=0, Total=272 [2022-01-31 21:00:02,873 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 12 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 94 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 103 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 94 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:00:02,874 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 43 Invalid, 103 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 94 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-31 21:00:02,874 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2022-01-31 21:00:02,880 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2022-01-31 21:00:02,881 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) [2022-01-31 21:00:02,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2022-01-31 21:00:02,882 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 17 [2022-01-31 21:00:02,882 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:00:02,883 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2022-01-31 21:00:02,883 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 1.4444444444444444) internal successors, (13), 8 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) [2022-01-31 21:00:02,883 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2022-01-31 21:00:02,884 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-01-31 21:00:02,884 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:00:02,884 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:00:02,884 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-01-31 21:00:02,884 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:00:02,885 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:00:02,885 INFO L85 PathProgramCache]: Analyzing trace with hash -1335857084, now seen corresponding path program 3 times [2022-01-31 21:00:02,885 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:00:02,885 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1516163356] [2022-01-31 21:00:02,885 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:00:02,917 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:02,958 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:02,959 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:03,012 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:03,033 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:03,034 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:03,034 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:00:03,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:03,099 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:00:03,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:03,103 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:00:03,212 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:00:03,212 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1516163356] [2022-01-31 21:00:03,212 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1516163356] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:00:03,213 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:00:03,213 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-01-31 21:00:03,213 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [189206982] [2022-01-31 21:00:03,213 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:00:03,213 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-01-31 21:00:03,213 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:00:03,213 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-01-31 21:00:03,213 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2022-01-31 21:00:03,214 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand has 11 states, 10 states have (on average 1.5) internal successors, (15), 9 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) [2022-01-31 21:00:03,340 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:00:03,340 INFO L93 Difference]: Finished difference Result 30 states and 35 transitions. [2022-01-31 21:00:03,340 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-01-31 21:00:03,340 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 1.5) internal successors, (15), 9 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 [2022-01-31 21:00:03,340 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:00:03,341 INFO L225 Difference]: With dead ends: 30 [2022-01-31 21:00:03,341 INFO L226 Difference]: Without dead ends: 23 [2022-01-31 21:00:03,341 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 7 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2022-01-31 21:00:03,342 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 13 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 136 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 53 SdHoareTripleChecker+Invalid, 146 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 136 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:00:03,342 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 53 Invalid, 146 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 136 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-31 21:00:03,342 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2022-01-31 21:00:03,344 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2022-01-31 21:00:03,344 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) [2022-01-31 21:00:03,345 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2022-01-31 21:00:03,345 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 19 [2022-01-31 21:00:03,345 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:00:03,345 INFO L470 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2022-01-31 21:00:03,345 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 1.5) internal successors, (15), 9 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) [2022-01-31 21:00:03,345 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2022-01-31 21:00:03,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-01-31 21:00:03,346 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:00:03,346 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:00:03,346 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2022-01-31 21:00:03,346 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:00:03,346 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:00:03,346 INFO L85 PathProgramCache]: Analyzing trace with hash 1506236063, now seen corresponding path program 4 times [2022-01-31 21:00:03,346 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:00:03,346 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [360784908] [2022-01-31 21:00:03,346 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:00:03,377 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:03,426 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:03,427 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:03,475 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:03,499 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:03,500 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:03,500 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:00:03,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:03,575 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:00:03,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:03,582 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:00:03,698 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:00:03,699 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [360784908] [2022-01-31 21:00:03,699 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [360784908] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:00:03,699 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:00:03,699 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2022-01-31 21:00:03,699 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2064139074] [2022-01-31 21:00:03,699 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:00:03,699 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-01-31 21:00:03,699 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:00:03,700 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-01-31 21:00:03,700 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2022-01-31 21:00:03,700 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand has 12 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 10 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) [2022-01-31 21:00:03,847 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:00:03,847 INFO L93 Difference]: Finished difference Result 32 states and 37 transitions. [2022-01-31 21:00:03,847 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-01-31 21:00:03,848 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 10 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 [2022-01-31 21:00:03,848 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:00:03,848 INFO L225 Difference]: With dead ends: 32 [2022-01-31 21:00:03,848 INFO L226 Difference]: Without dead ends: 25 [2022-01-31 21:00:03,849 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=75, Invalid=345, Unknown=0, NotChecked=0, Total=420 [2022-01-31 21:00:03,851 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 14 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 171 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 182 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 171 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:00:03,851 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 58 Invalid, 182 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 171 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-31 21:00:03,852 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2022-01-31 21:00:03,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2022-01-31 21:00:03,859 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) [2022-01-31 21:00:03,860 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2022-01-31 21:00:03,860 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 21 [2022-01-31 21:00:03,861 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:00:03,861 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2022-01-31 21:00:03,861 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 10 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) [2022-01-31 21:00:03,861 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2022-01-31 21:00:03,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-01-31 21:00:03,861 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:00:03,861 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:00:03,861 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2022-01-31 21:00:03,862 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:00:03,862 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:00:03,862 INFO L85 PathProgramCache]: Analyzing trace with hash 1158550074, now seen corresponding path program 5 times [2022-01-31 21:00:03,862 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:00:03,862 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [330869295] [2022-01-31 21:00:03,862 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:00:03,885 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:03,938 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:03,938 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:03,977 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:03,995 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:03,995 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:03,995 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:00:04,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:04,078 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:00:04,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:04,081 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:00:04,212 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:00:04,212 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [330869295] [2022-01-31 21:00:04,212 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [330869295] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:00:04,212 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:00:04,212 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2022-01-31 21:00:04,212 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [415153507] [2022-01-31 21:00:04,212 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:00:04,212 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-01-31 21:00:04,213 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:00:04,213 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-01-31 21:00:04,213 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=196, Unknown=0, NotChecked=0, Total=240 [2022-01-31 21:00:04,213 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand has 13 states, 12 states have (on average 1.5833333333333333) internal successors, (19), 11 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) [2022-01-31 21:00:04,392 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:00:04,392 INFO L93 Difference]: Finished difference Result 34 states and 39 transitions. [2022-01-31 21:00:04,392 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-01-31 21:00:04,393 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 1.5833333333333333) internal successors, (19), 11 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 [2022-01-31 21:00:04,393 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:00:04,393 INFO L225 Difference]: With dead ends: 34 [2022-01-31 21:00:04,393 INFO L226 Difference]: Without dead ends: 27 [2022-01-31 21:00:04,393 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 9 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 74 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=83, Invalid=423, Unknown=0, NotChecked=0, Total=506 [2022-01-31 21:00:04,394 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 15 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 210 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 222 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 210 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:00:04,394 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 63 Invalid, 222 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 210 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-31 21:00:04,394 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2022-01-31 21:00:04,397 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2022-01-31 21:00:04,397 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) [2022-01-31 21:00:04,397 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 29 transitions. [2022-01-31 21:00:04,397 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 29 transitions. Word has length 23 [2022-01-31 21:00:04,397 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:00:04,397 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 29 transitions. [2022-01-31 21:00:04,398 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 1.5833333333333333) internal successors, (19), 11 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) [2022-01-31 21:00:04,398 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 29 transitions. [2022-01-31 21:00:04,398 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-01-31 21:00:04,398 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:00:04,398 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:00:04,398 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2022-01-31 21:00:04,398 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:00:04,399 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:00:04,399 INFO L85 PathProgramCache]: Analyzing trace with hash 2039763733, now seen corresponding path program 6 times [2022-01-31 21:00:04,399 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:00:04,399 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1280650833] [2022-01-31 21:00:04,399 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:00:04,425 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:04,474 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:04,474 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:04,529 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:04,557 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:04,557 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:04,557 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:00:04,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:04,648 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:00:04,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:04,652 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:00:04,848 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:00:04,848 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1280650833] [2022-01-31 21:00:04,848 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1280650833] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:00:04,848 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:00:04,849 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-01-31 21:00:04,849 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1735731906] [2022-01-31 21:00:04,849 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:00:04,849 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-01-31 21:00:04,849 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:00:04,850 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-01-31 21:00:04,850 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=225, Unknown=0, NotChecked=0, Total=272 [2022-01-31 21:00:04,850 INFO L87 Difference]: Start difference. First operand 27 states and 29 transitions. Second operand has 14 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 12 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) [2022-01-31 21:00:05,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:00:05,057 INFO L93 Difference]: Finished difference Result 36 states and 41 transitions. [2022-01-31 21:00:05,057 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-01-31 21:00:05,057 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 12 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 [2022-01-31 21:00:05,058 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:00:05,058 INFO L225 Difference]: With dead ends: 36 [2022-01-31 21:00:05,058 INFO L226 Difference]: Without dead ends: 29 [2022-01-31 21:00:05,058 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 10 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=91, Invalid=509, Unknown=0, NotChecked=0, Total=600 [2022-01-31 21:00:05,059 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 16 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 234 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 247 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 234 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:00:05,059 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 63 Invalid, 247 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 234 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-31 21:00:05,059 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2022-01-31 21:00:05,062 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2022-01-31 21:00:05,062 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) [2022-01-31 21:00:05,062 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2022-01-31 21:00:05,062 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 25 [2022-01-31 21:00:05,063 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:00:05,063 INFO L470 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2022-01-31 21:00:05,063 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 12 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) [2022-01-31 21:00:05,063 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2022-01-31 21:00:05,063 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-01-31 21:00:05,063 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:00:05,063 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:00:05,063 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2022-01-31 21:00:05,064 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:00:05,064 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:00:05,064 INFO L85 PathProgramCache]: Analyzing trace with hash -1517434576, now seen corresponding path program 7 times [2022-01-31 21:00:05,064 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:00:05,064 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [665368704] [2022-01-31 21:00:05,064 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:00:05,091 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:05,128 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:05,128 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:05,178 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:05,196 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:05,196 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:05,196 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:00:05,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:05,265 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:00:05,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:05,268 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:00:05,435 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:00:05,435 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [665368704] [2022-01-31 21:00:05,435 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [665368704] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:00:05,435 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:00:05,435 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-01-31 21:00:05,435 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [620260520] [2022-01-31 21:00:05,435 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:00:05,436 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-01-31 21:00:05,436 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:00:05,436 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-01-31 21:00:05,436 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=256, Unknown=0, NotChecked=0, Total=306 [2022-01-31 21:00:05,436 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand has 15 states, 14 states have (on average 1.6428571428571428) internal successors, (23), 13 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) [2022-01-31 21:00:05,646 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:00:05,646 INFO L93 Difference]: Finished difference Result 38 states and 43 transitions. [2022-01-31 21:00:05,646 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-01-31 21:00:05,646 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 1.6428571428571428) internal successors, (23), 13 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 [2022-01-31 21:00:05,647 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:00:05,647 INFO L225 Difference]: With dead ends: 38 [2022-01-31 21:00:05,647 INFO L226 Difference]: Without dead ends: 31 [2022-01-31 21:00:05,648 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 11 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 103 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=99, Invalid=603, Unknown=0, NotChecked=0, Total=702 [2022-01-31 21:00:05,649 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 17 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 300 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 314 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 300 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:00:05,650 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 73 Invalid, 314 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 300 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-31 21:00:05,650 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2022-01-31 21:00:05,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2022-01-31 21:00:05,668 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) [2022-01-31 21:00:05,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 33 transitions. [2022-01-31 21:00:05,673 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 33 transitions. Word has length 27 [2022-01-31 21:00:05,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:00:05,673 INFO L470 AbstractCegarLoop]: Abstraction has 31 states and 33 transitions. [2022-01-31 21:00:05,673 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 1.6428571428571428) internal successors, (23), 13 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) [2022-01-31 21:00:05,673 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 33 transitions. [2022-01-31 21:00:05,678 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-01-31 21:00:05,679 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:00:05,679 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:00:05,679 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2022-01-31 21:00:05,679 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:00:05,679 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:00:05,679 INFO L85 PathProgramCache]: Analyzing trace with hash -1191041909, now seen corresponding path program 8 times [2022-01-31 21:00:05,680 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:00:05,680 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [473552367] [2022-01-31 21:00:05,680 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:00:05,711 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:05,771 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:05,771 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:05,857 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:05,898 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:05,898 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:05,898 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:00:05,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:05,970 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:00:05,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:05,981 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:00:06,180 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:00:06,180 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [473552367] [2022-01-31 21:00:06,180 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [473552367] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:00:06,180 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:00:06,180 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2022-01-31 21:00:06,180 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1990841347] [2022-01-31 21:00:06,180 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:00:06,181 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-01-31 21:00:06,181 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:00:06,181 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-01-31 21:00:06,181 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=289, Unknown=0, NotChecked=0, Total=342 [2022-01-31 21:00:06,181 INFO L87 Difference]: Start difference. First operand 31 states and 33 transitions. Second operand has 16 states, 15 states have (on average 1.6666666666666667) internal successors, (25), 14 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) [2022-01-31 21:00:06,437 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:00:06,437 INFO L93 Difference]: Finished difference Result 40 states and 45 transitions. [2022-01-31 21:00:06,438 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-01-31 21:00:06,438 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 1.6666666666666667) internal successors, (25), 14 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 [2022-01-31 21:00:06,438 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:00:06,438 INFO L225 Difference]: With dead ends: 40 [2022-01-31 21:00:06,438 INFO L226 Difference]: Without dead ends: 33 [2022-01-31 21:00:06,439 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 12 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 119 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=107, Invalid=705, Unknown=0, NotChecked=0, Total=812 [2022-01-31 21:00:06,439 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 18 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 328 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 343 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 328 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:00:06,439 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 73 Invalid, 343 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 328 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-31 21:00:06,440 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2022-01-31 21:00:06,442 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2022-01-31 21:00:06,442 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) [2022-01-31 21:00:06,443 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 35 transitions. [2022-01-31 21:00:06,443 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 35 transitions. Word has length 29 [2022-01-31 21:00:06,443 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:00:06,443 INFO L470 AbstractCegarLoop]: Abstraction has 33 states and 35 transitions. [2022-01-31 21:00:06,443 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 15 states have (on average 1.6666666666666667) internal successors, (25), 14 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) [2022-01-31 21:00:06,443 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 35 transitions. [2022-01-31 21:00:06,444 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-01-31 21:00:06,444 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:00:06,444 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:00:06,444 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2022-01-31 21:00:06,444 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:00:06,444 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:00:06,444 INFO L85 PathProgramCache]: Analyzing trace with hash -1060301530, now seen corresponding path program 9 times [2022-01-31 21:00:06,444 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:00:06,444 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [138687829] [2022-01-31 21:00:06,444 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:00:06,463 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:06,513 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:06,513 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:06,560 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:06,578 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:06,578 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:06,578 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:00:06,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:06,643 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:00:06,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:06,647 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:00:06,839 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:00:06,839 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [138687829] [2022-01-31 21:00:06,840 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [138687829] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:00:06,840 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:00:06,840 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2022-01-31 21:00:06,840 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1869681325] [2022-01-31 21:00:06,840 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:00:06,840 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-01-31 21:00:06,840 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:00:06,840 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-01-31 21:00:06,841 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=324, Unknown=0, NotChecked=0, Total=380 [2022-01-31 21:00:06,841 INFO L87 Difference]: Start difference. First operand 33 states and 35 transitions. Second operand has 17 states, 16 states have (on average 1.6875) internal successors, (27), 15 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) [2022-01-31 21:00:07,138 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:00:07,138 INFO L93 Difference]: Finished difference Result 42 states and 47 transitions. [2022-01-31 21:00:07,139 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-01-31 21:00:07,139 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 1.6875) internal successors, (27), 15 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 [2022-01-31 21:00:07,139 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:00:07,139 INFO L225 Difference]: With dead ends: 42 [2022-01-31 21:00:07,139 INFO L226 Difference]: Without dead ends: 35 [2022-01-31 21:00:07,140 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 136 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=115, Invalid=815, Unknown=0, NotChecked=0, Total=930 [2022-01-31 21:00:07,140 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 19 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 381 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 397 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 381 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:00:07,140 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 78 Invalid, 397 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 381 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-01-31 21:00:07,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2022-01-31 21:00:07,143 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2022-01-31 21:00:07,143 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) [2022-01-31 21:00:07,143 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2022-01-31 21:00:07,143 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 31 [2022-01-31 21:00:07,144 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:00:07,144 INFO L470 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2022-01-31 21:00:07,144 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 1.6875) internal successors, (27), 15 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) [2022-01-31 21:00:07,144 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2022-01-31 21:00:07,144 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-01-31 21:00:07,144 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:00:07,144 INFO L514 BasicCegarLoop]: trace histogram [11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:00:07,144 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2022-01-31 21:00:07,144 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:00:07,145 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:00:07,145 INFO L85 PathProgramCache]: Analyzing trace with hash 27151105, now seen corresponding path program 10 times [2022-01-31 21:00:07,145 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:00:07,145 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1614101513] [2022-01-31 21:00:07,145 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:00:07,169 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:07,217 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:07,217 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:07,264 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:07,281 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:07,282 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:07,282 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:00:07,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:07,342 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:00:07,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:07,345 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:00:07,552 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:00:07,552 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1614101513] [2022-01-31 21:00:07,553 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1614101513] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:00:07,553 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:00:07,553 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2022-01-31 21:00:07,553 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [163076742] [2022-01-31 21:00:07,553 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:00:07,553 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-01-31 21:00:07,553 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:00:07,553 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-01-31 21:00:07,554 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2022-01-31 21:00:07,554 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand has 18 states, 17 states have (on average 1.7058823529411764) internal successors, (29), 16 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) [2022-01-31 21:00:07,851 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:00:07,851 INFO L93 Difference]: Finished difference Result 44 states and 49 transitions. [2022-01-31 21:00:07,851 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-01-31 21:00:07,851 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 1.7058823529411764) internal successors, (29), 16 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 [2022-01-31 21:00:07,852 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:00:07,852 INFO L225 Difference]: With dead ends: 44 [2022-01-31 21:00:07,852 INFO L226 Difference]: Without dead ends: 37 [2022-01-31 21:00:07,852 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 154 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=123, Invalid=933, Unknown=0, NotChecked=0, Total=1056 [2022-01-31 21:00:07,853 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 20 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 465 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 482 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 465 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-01-31 21:00:07,853 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 88 Invalid, 482 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 465 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-01-31 21:00:07,853 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2022-01-31 21:00:07,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2022-01-31 21:00:07,856 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) [2022-01-31 21:00:07,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 39 transitions. [2022-01-31 21:00:07,856 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 39 transitions. Word has length 33 [2022-01-31 21:00:07,856 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:00:07,856 INFO L470 AbstractCegarLoop]: Abstraction has 37 states and 39 transitions. [2022-01-31 21:00:07,856 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 1.7058823529411764) internal successors, (29), 16 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) [2022-01-31 21:00:07,856 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 39 transitions. [2022-01-31 21:00:07,857 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-01-31 21:00:07,857 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:00:07,857 INFO L514 BasicCegarLoop]: trace histogram [12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:00:07,857 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2022-01-31 21:00:07,857 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:00:07,857 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:00:07,857 INFO L85 PathProgramCache]: Analyzing trace with hash 1392080412, now seen corresponding path program 11 times [2022-01-31 21:00:07,857 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:00:07,857 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [838598277] [2022-01-31 21:00:07,857 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:00:07,881 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:07,917 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:07,917 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:07,953 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:07,976 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:07,976 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:07,976 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:00:07,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:08,055 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:00:08,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:08,061 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:00:08,291 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:00:08,291 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [838598277] [2022-01-31 21:00:08,291 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [838598277] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:00:08,291 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:00:08,291 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2022-01-31 21:00:08,291 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [114798465] [2022-01-31 21:00:08,291 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:00:08,292 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-01-31 21:00:08,292 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:00:08,292 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-01-31 21:00:08,292 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=400, Unknown=0, NotChecked=0, Total=462 [2022-01-31 21:00:08,292 INFO L87 Difference]: Start difference. First operand 37 states and 39 transitions. Second operand has 19 states, 18 states have (on average 1.7222222222222223) internal successors, (31), 17 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) [2022-01-31 21:00:08,660 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:00:08,660 INFO L93 Difference]: Finished difference Result 46 states and 51 transitions. [2022-01-31 21:00:08,660 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-01-31 21:00:08,661 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 1.7222222222222223) internal successors, (31), 17 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 [2022-01-31 21:00:08,661 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:00:08,661 INFO L225 Difference]: With dead ends: 46 [2022-01-31 21:00:08,661 INFO L226 Difference]: Without dead ends: 39 [2022-01-31 21:00:08,662 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 173 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=131, Invalid=1059, Unknown=0, NotChecked=0, Total=1190 [2022-01-31 21:00:08,662 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 21 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 528 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 93 SdHoareTripleChecker+Invalid, 546 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 528 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-01-31 21:00:08,662 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 93 Invalid, 546 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 528 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-01-31 21:00:08,663 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2022-01-31 21:00:08,665 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2022-01-31 21:00:08,665 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) [2022-01-31 21:00:08,665 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 41 transitions. [2022-01-31 21:00:08,666 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 41 transitions. Word has length 35 [2022-01-31 21:00:08,666 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:00:08,666 INFO L470 AbstractCegarLoop]: Abstraction has 39 states and 41 transitions. [2022-01-31 21:00:08,666 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 18 states have (on average 1.7222222222222223) internal successors, (31), 17 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) [2022-01-31 21:00:08,666 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 41 transitions. [2022-01-31 21:00:08,666 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-01-31 21:00:08,666 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:00:08,666 INFO L514 BasicCegarLoop]: trace histogram [13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:00:08,666 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2022-01-31 21:00:08,667 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:00:08,667 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:00:08,667 INFO L85 PathProgramCache]: Analyzing trace with hash -1170848137, now seen corresponding path program 12 times [2022-01-31 21:00:08,667 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:00:08,667 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1885344160] [2022-01-31 21:00:08,667 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:00:08,692 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:08,738 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:08,738 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:08,772 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:08,794 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:08,795 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:08,795 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:00:08,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:08,857 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:00:08,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:08,860 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:00:09,108 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:00:09,108 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1885344160] [2022-01-31 21:00:09,108 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1885344160] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:00:09,108 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:00:09,108 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2022-01-31 21:00:09,108 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [888075889] [2022-01-31 21:00:09,108 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:00:09,109 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-01-31 21:00:09,109 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:00:09,109 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-01-31 21:00:09,109 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=441, Unknown=0, NotChecked=0, Total=506 [2022-01-31 21:00:09,109 INFO L87 Difference]: Start difference. First operand 39 states and 41 transitions. Second operand has 20 states, 19 states have (on average 1.736842105263158) internal successors, (33), 18 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) [2022-01-31 21:00:09,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:00:09,463 INFO L93 Difference]: Finished difference Result 48 states and 53 transitions. [2022-01-31 21:00:09,464 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-01-31 21:00:09,464 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 1.736842105263158) internal successors, (33), 18 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 [2022-01-31 21:00:09,464 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:00:09,464 INFO L225 Difference]: With dead ends: 48 [2022-01-31 21:00:09,464 INFO L226 Difference]: Without dead ends: 41 [2022-01-31 21:00:09,465 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 193 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=139, Invalid=1193, Unknown=0, NotChecked=0, Total=1332 [2022-01-31 21:00:09,465 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 22 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 595 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 614 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 595 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-01-31 21:00:09,465 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 98 Invalid, 614 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 595 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-01-31 21:00:09,465 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2022-01-31 21:00:09,468 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2022-01-31 21:00:09,468 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) [2022-01-31 21:00:09,468 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 43 transitions. [2022-01-31 21:00:09,468 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 43 transitions. Word has length 37 [2022-01-31 21:00:09,468 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:00:09,468 INFO L470 AbstractCegarLoop]: Abstraction has 41 states and 43 transitions. [2022-01-31 21:00:09,469 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 19 states have (on average 1.736842105263158) internal successors, (33), 18 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) [2022-01-31 21:00:09,469 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 43 transitions. [2022-01-31 21:00:09,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-01-31 21:00:09,469 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:00:09,469 INFO L514 BasicCegarLoop]: trace histogram [14, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:00:09,469 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2022-01-31 21:00:09,469 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:00:09,469 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:00:09,470 INFO L85 PathProgramCache]: Analyzing trace with hash 1166044178, now seen corresponding path program 13 times [2022-01-31 21:00:09,470 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:00:09,470 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1326729749] [2022-01-31 21:00:09,470 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:00:09,483 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:09,523 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:09,523 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:09,559 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:09,578 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:09,578 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:09,578 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:00:09,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:09,624 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:00:09,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:09,627 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:00:09,819 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:00:09,819 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1326729749] [2022-01-31 21:00:09,820 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1326729749] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:00:09,820 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:00:09,820 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2022-01-31 21:00:09,820 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1427135820] [2022-01-31 21:00:09,834 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:00:09,834 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-01-31 21:00:09,834 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:00:09,835 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-01-31 21:00:09,835 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=484, Unknown=0, NotChecked=0, Total=552 [2022-01-31 21:00:09,835 INFO L87 Difference]: Start difference. First operand 41 states and 43 transitions. Second operand has 21 states, 20 states have (on average 1.75) internal successors, (35), 19 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) [2022-01-31 21:00:10,278 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:00:10,278 INFO L93 Difference]: Finished difference Result 50 states and 55 transitions. [2022-01-31 21:00:10,278 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-01-31 21:00:10,278 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 1.75) internal successors, (35), 19 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 [2022-01-31 21:00:10,278 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:00:10,279 INFO L225 Difference]: With dead ends: 50 [2022-01-31 21:00:10,279 INFO L226 Difference]: Without dead ends: 43 [2022-01-31 21:00:10,279 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 214 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=147, Invalid=1335, Unknown=0, NotChecked=0, Total=1482 [2022-01-31 21:00:10,280 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 23 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 633 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 653 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 633 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-01-31 21:00:10,280 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 98 Invalid, 653 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 633 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-01-31 21:00:10,280 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2022-01-31 21:00:10,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2022-01-31 21:00:10,283 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) [2022-01-31 21:00:10,283 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 45 transitions. [2022-01-31 21:00:10,283 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 45 transitions. Word has length 39 [2022-01-31 21:00:10,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:00:10,283 INFO L470 AbstractCegarLoop]: Abstraction has 43 states and 45 transitions. [2022-01-31 21:00:10,283 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 20 states have (on average 1.75) internal successors, (35), 19 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) [2022-01-31 21:00:10,283 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 45 transitions. [2022-01-31 21:00:10,284 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-01-31 21:00:10,284 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:00:10,284 INFO L514 BasicCegarLoop]: trace histogram [15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:00:10,284 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2022-01-31 21:00:10,284 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:00:10,284 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:00:10,284 INFO L85 PathProgramCache]: Analyzing trace with hash 651663085, now seen corresponding path program 14 times [2022-01-31 21:00:10,284 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:00:10,284 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2076155087] [2022-01-31 21:00:10,284 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:00:10,304 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:10,352 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:10,352 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:10,390 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:10,412 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:10,413 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:10,413 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:00:10,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:10,481 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:00:10,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:10,485 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:00:10,772 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:00:10,772 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2076155087] [2022-01-31 21:00:10,772 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [2076155087] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:00:10,772 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:00:10,772 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2022-01-31 21:00:10,772 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [957562388] [2022-01-31 21:00:10,772 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:00:10,772 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-01-31 21:00:10,772 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:00:10,773 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-01-31 21:00:10,773 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=529, Unknown=0, NotChecked=0, Total=600 [2022-01-31 21:00:10,773 INFO L87 Difference]: Start difference. First operand 43 states and 45 transitions. Second operand has 22 states, 21 states have (on average 1.7619047619047619) internal successors, (37), 20 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) [2022-01-31 21:00:11,281 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:00:11,281 INFO L93 Difference]: Finished difference Result 52 states and 57 transitions. [2022-01-31 21:00:11,281 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-01-31 21:00:11,282 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 1.7619047619047619) internal successors, (37), 20 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 [2022-01-31 21:00:11,282 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:00:11,282 INFO L225 Difference]: With dead ends: 52 [2022-01-31 21:00:11,282 INFO L226 Difference]: Without dead ends: 45 [2022-01-31 21:00:11,283 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 18 SyntacticMatches, 1 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 236 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=155, Invalid=1485, Unknown=0, NotChecked=0, Total=1640 [2022-01-31 21:00:11,283 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 24 mSDsluCounter, 92 mSDsCounter, 0 mSdLazyCounter, 706 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 103 SdHoareTripleChecker+Invalid, 727 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 706 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:00:11,283 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [24 Valid, 103 Invalid, 727 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 706 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-01-31 21:00:11,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2022-01-31 21:00:11,286 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2022-01-31 21:00:11,286 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) [2022-01-31 21:00:11,286 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 47 transitions. [2022-01-31 21:00:11,286 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 47 transitions. Word has length 41 [2022-01-31 21:00:11,286 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:00:11,286 INFO L470 AbstractCegarLoop]: Abstraction has 45 states and 47 transitions. [2022-01-31 21:00:11,287 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 21 states have (on average 1.7619047619047619) internal successors, (37), 20 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) [2022-01-31 21:00:11,287 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 47 transitions. [2022-01-31 21:00:11,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-01-31 21:00:11,287 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:00:11,287 INFO L514 BasicCegarLoop]: trace histogram [16, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:00:11,287 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2022-01-31 21:00:11,287 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:00:11,287 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:00:11,287 INFO L85 PathProgramCache]: Analyzing trace with hash 252671752, now seen corresponding path program 15 times [2022-01-31 21:00:11,288 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:00:11,288 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2045769963] [2022-01-31 21:00:11,288 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:00:11,311 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:11,358 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:11,359 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:11,394 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:11,411 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:11,412 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:11,412 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:00:11,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:11,497 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:00:11,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:11,502 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:00:11,840 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:00:11,840 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2045769963] [2022-01-31 21:00:11,840 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [2045769963] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:00:11,840 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:00:11,840 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2022-01-31 21:00:11,840 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1992647150] [2022-01-31 21:00:11,840 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:00:11,840 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-01-31 21:00:11,840 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:00:11,841 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-01-31 21:00:11,841 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=576, Unknown=0, NotChecked=0, Total=650 [2022-01-31 21:00:11,841 INFO L87 Difference]: Start difference. First operand 45 states and 47 transitions. Second operand has 23 states, 22 states have (on average 1.7727272727272727) internal successors, (39), 21 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) [2022-01-31 21:00:12,349 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:00:12,349 INFO L93 Difference]: Finished difference Result 54 states and 59 transitions. [2022-01-31 21:00:12,349 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-01-31 21:00:12,349 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 22 states have (on average 1.7727272727272727) internal successors, (39), 21 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 [2022-01-31 21:00:12,350 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:00:12,350 INFO L225 Difference]: With dead ends: 54 [2022-01-31 21:00:12,350 INFO L226 Difference]: Without dead ends: 47 [2022-01-31 21:00:12,351 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 259 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=163, Invalid=1643, Unknown=0, NotChecked=0, Total=1806 [2022-01-31 21:00:12,351 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 25 mSDsluCounter, 97 mSDsCounter, 0 mSdLazyCounter, 783 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 108 SdHoareTripleChecker+Invalid, 805 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 783 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:00:12,351 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 108 Invalid, 805 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 783 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-01-31 21:00:12,351 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2022-01-31 21:00:12,354 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2022-01-31 21:00:12,355 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) [2022-01-31 21:00:12,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 49 transitions. [2022-01-31 21:00:12,355 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 49 transitions. Word has length 43 [2022-01-31 21:00:12,355 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:00:12,355 INFO L470 AbstractCegarLoop]: Abstraction has 47 states and 49 transitions. [2022-01-31 21:00:12,355 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 22 states have (on average 1.7727272727272727) internal successors, (39), 21 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) [2022-01-31 21:00:12,355 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 49 transitions. [2022-01-31 21:00:12,356 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-01-31 21:00:12,356 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:00:12,356 INFO L514 BasicCegarLoop]: trace histogram [17, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:00:12,356 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2022-01-31 21:00:12,356 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:00:12,356 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:00:12,356 INFO L85 PathProgramCache]: Analyzing trace with hash -925909917, now seen corresponding path program 16 times [2022-01-31 21:00:12,356 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:00:12,356 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [983684855] [2022-01-31 21:00:12,357 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:00:12,382 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:12,416 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:12,416 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:12,461 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:12,484 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:12,485 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:12,485 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:00:12,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:12,550 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:00:12,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:12,554 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:00:12,883 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:00:12,884 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [983684855] [2022-01-31 21:00:12,884 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [983684855] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:00:12,884 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:00:12,884 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2022-01-31 21:00:12,884 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1821891638] [2022-01-31 21:00:12,884 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:00:12,884 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-01-31 21:00:12,884 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:00:12,884 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-01-31 21:00:12,885 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=625, Unknown=0, NotChecked=0, Total=702 [2022-01-31 21:00:12,885 INFO L87 Difference]: Start difference. First operand 47 states and 49 transitions. Second operand has 24 states, 23 states have (on average 1.7826086956521738) internal successors, (41), 22 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) [2022-01-31 21:00:13,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:00:13,470 INFO L93 Difference]: Finished difference Result 56 states and 61 transitions. [2022-01-31 21:00:13,471 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-01-31 21:00:13,471 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 1.7826086956521738) internal successors, (41), 22 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 [2022-01-31 21:00:13,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:00:13,471 INFO L225 Difference]: With dead ends: 56 [2022-01-31 21:00:13,471 INFO L226 Difference]: Without dead ends: 49 [2022-01-31 21:00:13,472 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 283 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=171, Invalid=1809, Unknown=0, NotChecked=0, Total=1980 [2022-01-31 21:00:13,472 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 26 mSDsluCounter, 102 mSDsCounter, 0 mSdLazyCounter, 864 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 113 SdHoareTripleChecker+Invalid, 887 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 864 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:00:13,473 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 113 Invalid, 887 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 864 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-01-31 21:00:13,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2022-01-31 21:00:13,476 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2022-01-31 21:00:13,476 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) [2022-01-31 21:00:13,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 51 transitions. [2022-01-31 21:00:13,477 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 51 transitions. Word has length 45 [2022-01-31 21:00:13,477 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:00:13,478 INFO L470 AbstractCegarLoop]: Abstraction has 49 states and 51 transitions. [2022-01-31 21:00:13,478 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 23 states have (on average 1.7826086956521738) internal successors, (41), 22 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) [2022-01-31 21:00:13,478 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 51 transitions. [2022-01-31 21:00:13,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-01-31 21:00:13,478 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:00:13,478 INFO L514 BasicCegarLoop]: trace histogram [18, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:00:13,478 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2022-01-31 21:00:13,479 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:00:13,479 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:00:13,479 INFO L85 PathProgramCache]: Analyzing trace with hash 328472318, now seen corresponding path program 17 times [2022-01-31 21:00:13,479 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:00:13,479 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [69301073] [2022-01-31 21:00:13,479 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:00:13,510 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:13,570 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:13,571 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:13,602 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:13,625 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:13,625 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:13,626 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:00:13,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:13,721 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:00:13,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:13,724 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:00:14,083 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:00:14,083 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [69301073] [2022-01-31 21:00:14,083 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [69301073] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:00:14,083 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:00:14,083 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2022-01-31 21:00:14,083 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1910533100] [2022-01-31 21:00:14,083 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:00:14,083 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-01-31 21:00:14,084 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:00:14,084 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-01-31 21:00:14,084 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=676, Unknown=0, NotChecked=0, Total=756 [2022-01-31 21:00:14,084 INFO L87 Difference]: Start difference. First operand 49 states and 51 transitions. Second operand has 25 states, 24 states have (on average 1.7916666666666667) internal successors, (43), 23 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) [2022-01-31 21:00:14,687 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:00:14,687 INFO L93 Difference]: Finished difference Result 58 states and 63 transitions. [2022-01-31 21:00:14,687 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-01-31 21:00:14,687 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 1.7916666666666667) internal successors, (43), 23 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 [2022-01-31 21:00:14,687 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:00:14,688 INFO L225 Difference]: With dead ends: 58 [2022-01-31 21:00:14,688 INFO L226 Difference]: Without dead ends: 51 [2022-01-31 21:00:14,688 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 21 SyntacticMatches, 1 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 308 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=179, Invalid=1983, Unknown=0, NotChecked=0, Total=2162 [2022-01-31 21:00:14,689 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 27 mSDsluCounter, 107 mSDsCounter, 0 mSdLazyCounter, 949 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 118 SdHoareTripleChecker+Invalid, 973 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 949 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:00:14,689 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 118 Invalid, 973 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 949 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-01-31 21:00:14,689 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2022-01-31 21:00:14,692 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2022-01-31 21:00:14,692 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) [2022-01-31 21:00:14,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 53 transitions. [2022-01-31 21:00:14,692 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 53 transitions. Word has length 47 [2022-01-31 21:00:14,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:00:14,692 INFO L470 AbstractCegarLoop]: Abstraction has 51 states and 53 transitions. [2022-01-31 21:00:14,692 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 24 states have (on average 1.7916666666666667) internal successors, (43), 23 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) [2022-01-31 21:00:14,692 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 53 transitions. [2022-01-31 21:00:14,693 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-01-31 21:00:14,693 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:00:14,693 INFO L514 BasicCegarLoop]: trace histogram [19, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:00:14,693 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2022-01-31 21:00:14,693 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:00:14,693 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:00:14,693 INFO L85 PathProgramCache]: Analyzing trace with hash -1096010023, now seen corresponding path program 18 times [2022-01-31 21:00:14,693 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:00:14,693 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [374576914] [2022-01-31 21:00:14,693 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:00:14,719 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:14,755 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:14,755 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:14,788 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:14,811 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:14,811 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:14,811 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:00:14,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:14,877 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:00:14,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:14,882 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:00:15,269 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:00:15,269 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [374576914] [2022-01-31 21:00:15,269 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [374576914] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:00:15,269 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:00:15,269 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2022-01-31 21:00:15,269 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [89709436] [2022-01-31 21:00:15,269 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:00:15,269 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-01-31 21:00:15,269 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:00:15,270 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-01-31 21:00:15,270 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=729, Unknown=0, NotChecked=0, Total=812 [2022-01-31 21:00:15,270 INFO L87 Difference]: Start difference. First operand 51 states and 53 transitions. Second operand has 26 states, 25 states have (on average 1.8) internal successors, (45), 24 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) [2022-01-31 21:00:15,915 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:00:15,916 INFO L93 Difference]: Finished difference Result 60 states and 65 transitions. [2022-01-31 21:00:15,916 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-01-31 21:00:15,916 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 1.8) internal successors, (45), 24 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 [2022-01-31 21:00:15,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:00:15,916 INFO L225 Difference]: With dead ends: 60 [2022-01-31 21:00:15,916 INFO L226 Difference]: Without dead ends: 53 [2022-01-31 21:00:15,917 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 334 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=187, Invalid=2165, Unknown=0, NotChecked=0, Total=2352 [2022-01-31 21:00:15,918 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 28 mSDsluCounter, 112 mSDsCounter, 0 mSdLazyCounter, 1038 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 123 SdHoareTripleChecker+Invalid, 1063 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 1038 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:00:15,918 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 123 Invalid, 1063 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 1038 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-01-31 21:00:15,918 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2022-01-31 21:00:15,921 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2022-01-31 21:00:15,921 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) [2022-01-31 21:00:15,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 55 transitions. [2022-01-31 21:00:15,921 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 55 transitions. Word has length 49 [2022-01-31 21:00:15,921 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:00:15,921 INFO L470 AbstractCegarLoop]: Abstraction has 53 states and 55 transitions. [2022-01-31 21:00:15,921 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 25 states have (on average 1.8) internal successors, (45), 24 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) [2022-01-31 21:00:15,921 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 55 transitions. [2022-01-31 21:00:15,922 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2022-01-31 21:00:15,922 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:00:15,922 INFO L514 BasicCegarLoop]: trace histogram [20, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:00:15,922 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2022-01-31 21:00:15,922 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:00:15,922 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:00:15,922 INFO L85 PathProgramCache]: Analyzing trace with hash 71027700, now seen corresponding path program 19 times [2022-01-31 21:00:15,922 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:00:15,922 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1178124424] [2022-01-31 21:00:15,922 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:00:15,940 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:15,985 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:15,986 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:16,023 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:16,039 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:16,040 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:16,040 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:00:16,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:16,117 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:00:16,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:16,120 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:00:16,532 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:00:16,532 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1178124424] [2022-01-31 21:00:16,532 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1178124424] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:00:16,532 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:00:16,532 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2022-01-31 21:00:16,532 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [928842081] [2022-01-31 21:00:16,532 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:00:16,532 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-01-31 21:00:16,533 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:00:16,533 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-01-31 21:00:16,533 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=784, Unknown=0, NotChecked=0, Total=870 [2022-01-31 21:00:16,533 INFO L87 Difference]: Start difference. First operand 53 states and 55 transitions. Second operand has 27 states, 26 states have (on average 1.8076923076923077) internal successors, (47), 25 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) [2022-01-31 21:00:17,305 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:00:17,306 INFO L93 Difference]: Finished difference Result 62 states and 67 transitions. [2022-01-31 21:00:17,306 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-01-31 21:00:17,306 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 26 states have (on average 1.8076923076923077) internal successors, (47), 25 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 [2022-01-31 21:00:17,306 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:00:17,306 INFO L225 Difference]: With dead ends: 62 [2022-01-31 21:00:17,307 INFO L226 Difference]: Without dead ends: 55 [2022-01-31 21:00:17,307 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 361 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=195, Invalid=2355, Unknown=0, NotChecked=0, Total=2550 [2022-01-31 21:00:17,308 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 29 mSDsluCounter, 122 mSDsCounter, 0 mSdLazyCounter, 1176 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 133 SdHoareTripleChecker+Invalid, 1202 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 1176 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-01-31 21:00:17,308 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 133 Invalid, 1202 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 1176 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-01-31 21:00:17,308 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2022-01-31 21:00:17,311 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2022-01-31 21:00:17,311 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) [2022-01-31 21:00:17,311 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 57 transitions. [2022-01-31 21:00:17,311 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 57 transitions. Word has length 51 [2022-01-31 21:00:17,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:00:17,311 INFO L470 AbstractCegarLoop]: Abstraction has 55 states and 57 transitions. [2022-01-31 21:00:17,311 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 26 states have (on average 1.8076923076923077) internal successors, (47), 25 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) [2022-01-31 21:00:17,312 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 57 transitions. [2022-01-31 21:00:17,312 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2022-01-31 21:00:17,312 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:00:17,312 INFO L514 BasicCegarLoop]: trace histogram [21, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:00:17,312 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2022-01-31 21:00:17,312 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:00:17,312 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:00:17,312 INFO L85 PathProgramCache]: Analyzing trace with hash 607815247, now seen corresponding path program 20 times [2022-01-31 21:00:17,313 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:00:17,313 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1255543832] [2022-01-31 21:00:17,313 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:00:17,332 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:17,380 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:17,380 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:17,414 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:17,430 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:17,430 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:17,430 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:00:17,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:17,484 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:00:17,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:17,488 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:00:17,823 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:00:17,823 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1255543832] [2022-01-31 21:00:17,823 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1255543832] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:00:17,823 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:00:17,823 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [] total 28 [2022-01-31 21:00:17,823 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [877069724] [2022-01-31 21:00:17,823 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:00:17,824 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-01-31 21:00:17,824 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:00:17,824 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-01-31 21:00:17,824 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=841, Unknown=0, NotChecked=0, Total=930 [2022-01-31 21:00:17,825 INFO L87 Difference]: Start difference. First operand 55 states and 57 transitions. Second operand has 28 states, 27 states have (on average 1.8148148148148149) internal successors, (49), 26 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) [2022-01-31 21:00:18,347 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:00:18,347 INFO L93 Difference]: Finished difference Result 64 states and 69 transitions. [2022-01-31 21:00:18,347 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-01-31 21:00:18,347 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 27 states have (on average 1.8148148148148149) internal successors, (49), 26 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 [2022-01-31 21:00:18,347 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:00:18,348 INFO L225 Difference]: With dead ends: 64 [2022-01-31 21:00:18,348 INFO L226 Difference]: Without dead ends: 57 [2022-01-31 21:00:18,349 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 24 SyntacticMatches, 1 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 389 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=203, Invalid=2553, Unknown=0, NotChecked=0, Total=2756 [2022-01-31 21:00:18,350 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 30 mSDsluCounter, 127 mSDsCounter, 0 mSdLazyCounter, 1275 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 138 SdHoareTripleChecker+Invalid, 1302 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 1275 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:00:18,350 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 138 Invalid, 1302 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 1275 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-01-31 21:00:18,350 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2022-01-31 21:00:18,362 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2022-01-31 21:00:18,363 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) [2022-01-31 21:00:18,363 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 59 transitions. [2022-01-31 21:00:18,363 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 59 transitions. Word has length 53 [2022-01-31 21:00:18,364 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:00:18,364 INFO L470 AbstractCegarLoop]: Abstraction has 57 states and 59 transitions. [2022-01-31 21:00:18,364 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 27 states have (on average 1.8148148148148149) internal successors, (49), 26 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) [2022-01-31 21:00:18,364 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 59 transitions. [2022-01-31 21:00:18,368 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-01-31 21:00:18,368 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:00:18,368 INFO L514 BasicCegarLoop]: trace histogram [22, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:00:18,368 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2022-01-31 21:00:18,368 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:00:18,369 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:00:18,369 INFO L85 PathProgramCache]: Analyzing trace with hash 1064572394, now seen corresponding path program 21 times [2022-01-31 21:00:18,369 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:00:18,369 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [393553431] [2022-01-31 21:00:18,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:00:18,386 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:18,423 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:18,424 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:18,446 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:18,457 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:18,457 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:18,457 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:00:18,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:18,566 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:00:18,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:18,569 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:00:19,085 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:00:19,086 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [393553431] [2022-01-31 21:00:19,086 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [393553431] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:00:19,086 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:00:19,086 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2022-01-31 21:00:19,086 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1544995308] [2022-01-31 21:00:19,086 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:00:19,086 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-01-31 21:00:19,086 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:00:19,087 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-01-31 21:00:19,087 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=900, Unknown=0, NotChecked=0, Total=992 [2022-01-31 21:00:19,087 INFO L87 Difference]: Start difference. First operand 57 states and 59 transitions. Second operand has 29 states, 28 states have (on average 1.8214285714285714) internal successors, (51), 27 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) [2022-01-31 21:00:19,935 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:00:19,935 INFO L93 Difference]: Finished difference Result 66 states and 71 transitions. [2022-01-31 21:00:19,936 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-01-31 21:00:19,936 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 28 states have (on average 1.8214285714285714) internal successors, (51), 27 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 [2022-01-31 21:00:19,936 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:00:19,936 INFO L225 Difference]: With dead ends: 66 [2022-01-31 21:00:19,936 INFO L226 Difference]: Without dead ends: 59 [2022-01-31 21:00:19,937 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 418 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=211, Invalid=2759, Unknown=0, NotChecked=0, Total=2970 [2022-01-31 21:00:19,937 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 31 mSDsluCounter, 127 mSDsCounter, 0 mSdLazyCounter, 1329 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 138 SdHoareTripleChecker+Invalid, 1357 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 1329 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-01-31 21:00:19,938 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [31 Valid, 138 Invalid, 1357 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 1329 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-01-31 21:00:19,938 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2022-01-31 21:00:19,941 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2022-01-31 21:00:19,941 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) [2022-01-31 21:00:19,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 61 transitions. [2022-01-31 21:00:19,941 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 61 transitions. Word has length 55 [2022-01-31 21:00:19,941 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:00:19,941 INFO L470 AbstractCegarLoop]: Abstraction has 59 states and 61 transitions. [2022-01-31 21:00:19,941 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 28 states have (on average 1.8214285714285714) internal successors, (51), 27 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) [2022-01-31 21:00:19,942 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 61 transitions. [2022-01-31 21:00:19,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2022-01-31 21:00:19,942 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:00:19,942 INFO L514 BasicCegarLoop]: trace histogram [23, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:00:19,942 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2022-01-31 21:00:19,942 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:00:19,942 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:00:19,942 INFO L85 PathProgramCache]: Analyzing trace with hash 1921526469, now seen corresponding path program 22 times [2022-01-31 21:00:19,942 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:00:19,942 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1829621930] [2022-01-31 21:00:19,943 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:00:19,964 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:19,997 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:19,997 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:20,033 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:20,053 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:20,053 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:20,053 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:00:20,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:20,118 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:00:20,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:20,121 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:00:20,464 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:00:20,464 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1829621930] [2022-01-31 21:00:20,464 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1829621930] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:00:20,464 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:00:20,464 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2022-01-31 21:00:20,464 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1412031363] [2022-01-31 21:00:20,464 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:00:20,465 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-01-31 21:00:20,465 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:00:20,465 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-01-31 21:00:20,465 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=961, Unknown=0, NotChecked=0, Total=1056 [2022-01-31 21:00:20,465 INFO L87 Difference]: Start difference. First operand 59 states and 61 transitions. Second operand has 30 states, 29 states have (on average 1.8275862068965518) internal successors, (53), 28 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) [2022-01-31 21:00:21,117 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:00:21,117 INFO L93 Difference]: Finished difference Result 68 states and 73 transitions. [2022-01-31 21:00:21,118 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-01-31 21:00:21,118 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 29 states have (on average 1.8275862068965518) internal successors, (53), 28 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 [2022-01-31 21:00:21,118 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:00:21,118 INFO L225 Difference]: With dead ends: 68 [2022-01-31 21:00:21,119 INFO L226 Difference]: Without dead ends: 61 [2022-01-31 21:00:21,120 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 26 SyntacticMatches, 1 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 448 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=219, Invalid=2973, Unknown=0, NotChecked=0, Total=3192 [2022-01-31 21:00:21,122 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 32 mSDsluCounter, 132 mSDsCounter, 0 mSdLazyCounter, 1434 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 143 SdHoareTripleChecker+Invalid, 1463 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 1434 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:00:21,122 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 143 Invalid, 1463 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 1434 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-01-31 21:00:21,123 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2022-01-31 21:00:21,136 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2022-01-31 21:00:21,136 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) [2022-01-31 21:00:21,136 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 63 transitions. [2022-01-31 21:00:21,137 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 63 transitions. Word has length 57 [2022-01-31 21:00:21,137 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:00:21,137 INFO L470 AbstractCegarLoop]: Abstraction has 61 states and 63 transitions. [2022-01-31 21:00:21,137 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 29 states have (on average 1.8275862068965518) internal successors, (53), 28 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) [2022-01-31 21:00:21,137 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 63 transitions. [2022-01-31 21:00:21,137 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-01-31 21:00:21,137 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:00:21,137 INFO L514 BasicCegarLoop]: trace histogram [24, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:00:21,137 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2022-01-31 21:00:21,138 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:00:21,138 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:00:21,138 INFO L85 PathProgramCache]: Analyzing trace with hash 820671712, now seen corresponding path program 23 times [2022-01-31 21:00:21,138 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:00:21,138 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2074268014] [2022-01-31 21:00:21,138 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:00:21,162 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:21,197 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:21,198 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:21,233 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:21,251 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:21,251 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:21,252 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:00:21,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:21,310 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:00:21,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:21,314 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:00:21,806 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:00:21,806 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2074268014] [2022-01-31 21:00:21,807 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [2074268014] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:00:21,807 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:00:21,807 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2022-01-31 21:00:21,807 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [599380432] [2022-01-31 21:00:21,807 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:00:21,807 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-01-31 21:00:21,807 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:00:21,808 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-01-31 21:00:21,808 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=1024, Unknown=0, NotChecked=0, Total=1122 [2022-01-31 21:00:21,809 INFO L87 Difference]: Start difference. First operand 61 states and 63 transitions. Second operand has 31 states, 30 states have (on average 1.8333333333333333) internal successors, (55), 29 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) [2022-01-31 21:00:22,515 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:00:22,516 INFO L93 Difference]: Finished difference Result 70 states and 75 transitions. [2022-01-31 21:00:22,516 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-01-31 21:00:22,516 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 30 states have (on average 1.8333333333333333) internal successors, (55), 29 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 [2022-01-31 21:00:22,517 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:00:22,517 INFO L225 Difference]: With dead ends: 70 [2022-01-31 21:00:22,517 INFO L226 Difference]: Without dead ends: 63 [2022-01-31 21:00:22,518 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 27 SyntacticMatches, 1 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 479 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=227, Invalid=3195, Unknown=0, NotChecked=0, Total=3422 [2022-01-31 21:00:22,518 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 33 mSDsluCounter, 142 mSDsCounter, 0 mSdLazyCounter, 1596 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 153 SdHoareTripleChecker+Invalid, 1626 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 1596 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-01-31 21:00:22,518 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 153 Invalid, 1626 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 1596 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-01-31 21:00:22,518 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2022-01-31 21:00:22,521 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2022-01-31 21:00:22,521 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) [2022-01-31 21:00:22,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 65 transitions. [2022-01-31 21:00:22,521 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 65 transitions. Word has length 59 [2022-01-31 21:00:22,521 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:00:22,521 INFO L470 AbstractCegarLoop]: Abstraction has 63 states and 65 transitions. [2022-01-31 21:00:22,521 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 30 states have (on average 1.8333333333333333) internal successors, (55), 29 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) [2022-01-31 21:00:22,522 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 65 transitions. [2022-01-31 21:00:22,522 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-01-31 21:00:22,522 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:00:22,522 INFO L514 BasicCegarLoop]: trace histogram [25, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:00:22,522 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2022-01-31 21:00:22,522 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:00:22,522 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:00:22,522 INFO L85 PathProgramCache]: Analyzing trace with hash -538794949, now seen corresponding path program 24 times [2022-01-31 21:00:22,522 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:00:22,523 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [601919964] [2022-01-31 21:00:22,523 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:00:22,555 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:22,590 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:22,590 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:22,622 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:22,638 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:22,639 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:22,639 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:00:22,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:22,699 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:00:22,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:22,701 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:00:23,276 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:00:23,276 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [601919964] [2022-01-31 21:00:23,276 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [601919964] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:00:23,276 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:00:23,276 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2022-01-31 21:00:23,276 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1741455660] [2022-01-31 21:00:23,276 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:00:23,276 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-01-31 21:00:23,276 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:00:23,277 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-01-31 21:00:23,277 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=1089, Unknown=0, NotChecked=0, Total=1190 [2022-01-31 21:00:23,277 INFO L87 Difference]: Start difference. First operand 63 states and 65 transitions. Second operand has 32 states, 31 states have (on average 1.8387096774193548) internal successors, (57), 30 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) [2022-01-31 21:00:24,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:00:24,360 INFO L93 Difference]: Finished difference Result 72 states and 77 transitions. [2022-01-31 21:00:24,360 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-01-31 21:00:24,361 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 31 states have (on average 1.8387096774193548) internal successors, (57), 30 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 [2022-01-31 21:00:24,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:00:24,361 INFO L225 Difference]: With dead ends: 72 [2022-01-31 21:00:24,361 INFO L226 Difference]: Without dead ends: 65 [2022-01-31 21:00:24,362 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 28 SyntacticMatches, 1 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 511 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=235, Invalid=3425, Unknown=0, NotChecked=0, Total=3660 [2022-01-31 21:00:24,362 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 34 mSDsluCounter, 147 mSDsCounter, 0 mSdLazyCounter, 1711 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 158 SdHoareTripleChecker+Invalid, 1742 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 1711 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-01-31 21:00:24,363 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [34 Valid, 158 Invalid, 1742 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 1711 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-01-31 21:00:24,363 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2022-01-31 21:00:24,365 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2022-01-31 21:00:24,366 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) [2022-01-31 21:00:24,366 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 67 transitions. [2022-01-31 21:00:24,366 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 67 transitions. Word has length 61 [2022-01-31 21:00:24,366 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:00:24,366 INFO L470 AbstractCegarLoop]: Abstraction has 65 states and 67 transitions. [2022-01-31 21:00:24,366 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 31 states have (on average 1.8387096774193548) internal successors, (57), 30 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) [2022-01-31 21:00:24,366 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 67 transitions. [2022-01-31 21:00:24,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2022-01-31 21:00:24,367 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:00:24,367 INFO L514 BasicCegarLoop]: trace histogram [26, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:00:24,367 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2022-01-31 21:00:24,367 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:00:24,367 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:00:24,367 INFO L85 PathProgramCache]: Analyzing trace with hash -1316198186, now seen corresponding path program 25 times [2022-01-31 21:00:24,367 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:00:24,367 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [166871984] [2022-01-31 21:00:24,367 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:00:24,386 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:24,422 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:24,423 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:24,474 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:24,498 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:24,498 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:24,498 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:00:24,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:24,563 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:00:24,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:24,566 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:00:25,084 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:00:25,085 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [166871984] [2022-01-31 21:00:25,085 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [166871984] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:00:25,085 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:00:25,085 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2022-01-31 21:00:25,085 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1319980251] [2022-01-31 21:00:25,085 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:00:25,085 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-01-31 21:00:25,085 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:00:25,086 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-01-31 21:00:25,086 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=1156, Unknown=0, NotChecked=0, Total=1260 [2022-01-31 21:00:25,086 INFO L87 Difference]: Start difference. First operand 65 states and 67 transitions. Second operand has 33 states, 32 states have (on average 1.84375) internal successors, (59), 31 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) [2022-01-31 21:00:26,238 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:00:26,238 INFO L93 Difference]: Finished difference Result 74 states and 79 transitions. [2022-01-31 21:00:26,238 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-01-31 21:00:26,238 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 32 states have (on average 1.84375) internal successors, (59), 31 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 [2022-01-31 21:00:26,238 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:00:26,239 INFO L225 Difference]: With dead ends: 74 [2022-01-31 21:00:26,239 INFO L226 Difference]: Without dead ends: 67 [2022-01-31 21:00:26,239 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 29 SyntacticMatches, 1 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 544 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=243, Invalid=3663, Unknown=0, NotChecked=0, Total=3906 [2022-01-31 21:00:26,240 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 35 mSDsluCounter, 152 mSDsCounter, 0 mSdLazyCounter, 1830 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 163 SdHoareTripleChecker+Invalid, 1862 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 1830 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-01-31 21:00:26,240 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [35 Valid, 163 Invalid, 1862 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 1830 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-01-31 21:00:26,240 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2022-01-31 21:00:26,242 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2022-01-31 21:00:26,243 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) [2022-01-31 21:00:26,243 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 69 transitions. [2022-01-31 21:00:26,243 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 69 transitions. Word has length 63 [2022-01-31 21:00:26,243 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:00:26,243 INFO L470 AbstractCegarLoop]: Abstraction has 67 states and 69 transitions. [2022-01-31 21:00:26,243 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 32 states have (on average 1.84375) internal successors, (59), 31 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) [2022-01-31 21:00:26,243 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 69 transitions. [2022-01-31 21:00:26,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2022-01-31 21:00:26,244 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:00:26,244 INFO L514 BasicCegarLoop]: trace histogram [27, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:00:26,244 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2022-01-31 21:00:26,244 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:00:26,244 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:00:26,244 INFO L85 PathProgramCache]: Analyzing trace with hash -1076399439, now seen corresponding path program 26 times [2022-01-31 21:00:26,244 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:00:26,244 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1298212975] [2022-01-31 21:00:26,244 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:00:26,262 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:26,297 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:26,297 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:26,326 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:26,342 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:26,343 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:26,343 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:00:26,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:26,415 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:00:26,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:26,417 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:00:26,902 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:00:26,902 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1298212975] [2022-01-31 21:00:26,902 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1298212975] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:00:26,902 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:00:26,902 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [34] imperfect sequences [] total 34 [2022-01-31 21:00:26,902 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1551251623] [2022-01-31 21:00:26,902 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:00:26,902 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2022-01-31 21:00:26,902 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:00:26,903 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2022-01-31 21:00:26,903 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=1225, Unknown=0, NotChecked=0, Total=1332 [2022-01-31 21:00:26,904 INFO L87 Difference]: Start difference. First operand 67 states and 69 transitions. Second operand has 34 states, 33 states have (on average 1.8484848484848484) internal successors, (61), 32 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) [2022-01-31 21:00:27,877 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:00:27,877 INFO L93 Difference]: Finished difference Result 76 states and 81 transitions. [2022-01-31 21:00:27,878 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-01-31 21:00:27,878 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 33 states have (on average 1.8484848484848484) internal successors, (61), 32 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 [2022-01-31 21:00:27,878 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:00:27,878 INFO L225 Difference]: With dead ends: 76 [2022-01-31 21:00:27,878 INFO L226 Difference]: Without dead ends: 69 [2022-01-31 21:00:27,880 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 30 SyntacticMatches, 1 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 578 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=251, Invalid=3909, Unknown=0, NotChecked=0, Total=4160 [2022-01-31 21:00:27,884 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 36 mSDsluCounter, 157 mSDsCounter, 0 mSdLazyCounter, 1953 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 168 SdHoareTripleChecker+Invalid, 1986 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 1953 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-01-31 21:00:27,884 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [36 Valid, 168 Invalid, 1986 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 1953 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-01-31 21:00:27,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2022-01-31 21:00:27,887 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2022-01-31 21:00:27,887 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) [2022-01-31 21:00:27,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 71 transitions. [2022-01-31 21:00:27,888 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 71 transitions. Word has length 65 [2022-01-31 21:00:27,888 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:00:27,888 INFO L470 AbstractCegarLoop]: Abstraction has 69 states and 71 transitions. [2022-01-31 21:00:27,888 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 33 states have (on average 1.8484848484848484) internal successors, (61), 32 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) [2022-01-31 21:00:27,888 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 71 transitions. [2022-01-31 21:00:27,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-01-31 21:00:27,888 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:00:27,888 INFO L514 BasicCegarLoop]: trace histogram [28, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:00:27,888 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2022-01-31 21:00:27,889 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:00:27,889 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:00:27,889 INFO L85 PathProgramCache]: Analyzing trace with hash 1736929740, now seen corresponding path program 27 times [2022-01-31 21:00:27,889 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:00:27,889 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [718635663] [2022-01-31 21:00:27,889 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:00:27,907 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:27,968 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:27,968 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:28,015 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:28,038 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:28,038 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:28,038 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:00:28,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:28,096 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:00:28,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:28,099 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:00:28,747 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:00:28,747 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [718635663] [2022-01-31 21:00:28,747 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [718635663] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:00:28,747 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:00:28,747 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2022-01-31 21:00:28,747 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [79607637] [2022-01-31 21:00:28,747 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:00:28,747 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-01-31 21:00:28,747 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:00:28,748 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-01-31 21:00:28,748 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=1296, Unknown=0, NotChecked=0, Total=1406 [2022-01-31 21:00:28,748 INFO L87 Difference]: Start difference. First operand 69 states and 71 transitions. Second operand has 35 states, 34 states have (on average 1.8529411764705883) internal successors, (63), 33 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) [2022-01-31 21:00:29,842 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:00:29,842 INFO L93 Difference]: Finished difference Result 78 states and 83 transitions. [2022-01-31 21:00:29,842 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2022-01-31 21:00:29,842 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 34 states have (on average 1.8529411764705883) internal successors, (63), 33 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 [2022-01-31 21:00:29,843 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:00:29,843 INFO L225 Difference]: With dead ends: 78 [2022-01-31 21:00:29,843 INFO L226 Difference]: Without dead ends: 71 [2022-01-31 21:00:29,843 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 613 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=259, Invalid=4163, Unknown=0, NotChecked=0, Total=4422 [2022-01-31 21:00:29,844 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 37 mSDsluCounter, 162 mSDsCounter, 0 mSdLazyCounter, 2080 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 173 SdHoareTripleChecker+Invalid, 2114 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 2080 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-01-31 21:00:29,844 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 173 Invalid, 2114 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 2080 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-01-31 21:00:29,844 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2022-01-31 21:00:29,847 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 71. [2022-01-31 21:00:29,847 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) [2022-01-31 21:00:29,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 73 transitions. [2022-01-31 21:00:29,847 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 73 transitions. Word has length 67 [2022-01-31 21:00:29,847 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:00:29,847 INFO L470 AbstractCegarLoop]: Abstraction has 71 states and 73 transitions. [2022-01-31 21:00:29,847 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 34 states have (on average 1.8529411764705883) internal successors, (63), 33 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) [2022-01-31 21:00:29,847 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 73 transitions. [2022-01-31 21:00:29,848 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2022-01-31 21:00:29,848 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:00:29,848 INFO L514 BasicCegarLoop]: trace histogram [29, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:00:29,848 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2022-01-31 21:00:29,848 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:00:29,848 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:00:29,848 INFO L85 PathProgramCache]: Analyzing trace with hash -483125721, now seen corresponding path program 28 times [2022-01-31 21:00:29,848 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:00:29,848 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [562338252] [2022-01-31 21:00:29,849 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:00:29,892 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:29,939 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:29,939 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:29,985 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:30,008 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:30,008 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:30,008 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:00:30,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:30,087 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:00:30,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:30,090 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:00:30,758 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:00:30,758 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [562338252] [2022-01-31 21:00:30,758 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [562338252] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:00:30,758 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:00:30,758 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [36] imperfect sequences [] total 36 [2022-01-31 21:00:30,758 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1780665863] [2022-01-31 21:00:30,758 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:00:30,758 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-01-31 21:00:30,759 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:00:30,759 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-01-31 21:00:30,759 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=1369, Unknown=0, NotChecked=0, Total=1482 [2022-01-31 21:00:30,759 INFO L87 Difference]: Start difference. First operand 71 states and 73 transitions. Second operand has 36 states, 35 states have (on average 1.8571428571428572) internal successors, (65), 34 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) [2022-01-31 21:00:32,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:00:32,058 INFO L93 Difference]: Finished difference Result 80 states and 85 transitions. [2022-01-31 21:00:32,058 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-01-31 21:00:32,058 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 35 states have (on average 1.8571428571428572) internal successors, (65), 34 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 [2022-01-31 21:00:32,059 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:00:32,059 INFO L225 Difference]: With dead ends: 80 [2022-01-31 21:00:32,059 INFO L226 Difference]: Without dead ends: 73 [2022-01-31 21:00:32,060 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 32 SyntacticMatches, 1 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 649 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=267, Invalid=4425, Unknown=0, NotChecked=0, Total=4692 [2022-01-31 21:00:32,060 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 38 mSDsluCounter, 162 mSDsCounter, 0 mSdLazyCounter, 2148 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 173 SdHoareTripleChecker+Invalid, 2183 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 2148 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-01-31 21:00:32,060 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 173 Invalid, 2183 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 2148 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-01-31 21:00:32,060 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2022-01-31 21:00:32,063 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 73. [2022-01-31 21:00:32,063 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) [2022-01-31 21:00:32,063 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 75 transitions. [2022-01-31 21:00:32,063 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 75 transitions. Word has length 69 [2022-01-31 21:00:32,063 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:00:32,063 INFO L470 AbstractCegarLoop]: Abstraction has 73 states and 75 transitions. [2022-01-31 21:00:32,063 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 35 states have (on average 1.8571428571428572) internal successors, (65), 34 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) [2022-01-31 21:00:32,064 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 75 transitions. [2022-01-31 21:00:32,064 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2022-01-31 21:00:32,064 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:00:32,064 INFO L514 BasicCegarLoop]: trace histogram [30, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:00:32,064 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2022-01-31 21:00:32,064 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:00:32,064 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:00:32,064 INFO L85 PathProgramCache]: Analyzing trace with hash 642322370, now seen corresponding path program 29 times [2022-01-31 21:00:32,064 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:00:32,064 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1575641967] [2022-01-31 21:00:32,065 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:00:32,079 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:32,111 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:32,112 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:32,146 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:32,166 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:32,166 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:32,166 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:00:32,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:32,218 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:00:32,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:32,225 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:00:32,938 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:00:32,938 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1575641967] [2022-01-31 21:00:32,938 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1575641967] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:00:32,938 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:00:32,938 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [37] imperfect sequences [] total 37 [2022-01-31 21:00:32,938 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1839255163] [2022-01-31 21:00:32,938 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:00:32,938 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2022-01-31 21:00:32,938 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:00:32,939 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2022-01-31 21:00:32,939 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=1444, Unknown=0, NotChecked=0, Total=1560 [2022-01-31 21:00:32,939 INFO L87 Difference]: Start difference. First operand 73 states and 75 transitions. Second operand has 37 states, 36 states have (on average 1.8611111111111112) internal successors, (67), 35 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) [2022-01-31 21:00:34,100 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:00:34,100 INFO L93 Difference]: Finished difference Result 82 states and 87 transitions. [2022-01-31 21:00:34,100 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-01-31 21:00:34,100 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 36 states have (on average 1.8611111111111112) internal successors, (67), 35 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 [2022-01-31 21:00:34,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:00:34,101 INFO L225 Difference]: With dead ends: 82 [2022-01-31 21:00:34,101 INFO L226 Difference]: Without dead ends: 75 [2022-01-31 21:00:34,101 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 686 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=275, Invalid=4695, Unknown=0, NotChecked=0, Total=4970 [2022-01-31 21:00:34,102 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 39 mSDsluCounter, 172 mSDsCounter, 0 mSdLazyCounter, 2346 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 183 SdHoareTripleChecker+Invalid, 2382 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 2346 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-01-31 21:00:34,102 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [39 Valid, 183 Invalid, 2382 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 2346 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-01-31 21:00:34,102 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2022-01-31 21:00:34,105 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2022-01-31 21:00:34,106 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) [2022-01-31 21:00:34,106 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 77 transitions. [2022-01-31 21:00:34,107 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 77 transitions. Word has length 71 [2022-01-31 21:00:34,107 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:00:34,107 INFO L470 AbstractCegarLoop]: Abstraction has 75 states and 77 transitions. [2022-01-31 21:00:34,107 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 36 states have (on average 1.8611111111111112) internal successors, (67), 35 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) [2022-01-31 21:00:34,107 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 77 transitions. [2022-01-31 21:00:34,107 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-01-31 21:00:34,107 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:00:34,107 INFO L514 BasicCegarLoop]: trace histogram [31, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:00:34,107 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2022-01-31 21:00:34,108 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:00:34,108 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:00:34,108 INFO L85 PathProgramCache]: Analyzing trace with hash -133820771, now seen corresponding path program 30 times [2022-01-31 21:00:34,108 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:00:34,108 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [208827160] [2022-01-31 21:00:34,108 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:00:34,131 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:34,182 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:34,182 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:34,231 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:34,255 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:34,255 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:34,255 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:00:34,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:34,319 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:00:34,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:34,324 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:00:34,918 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:00:34,918 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [208827160] [2022-01-31 21:00:34,919 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [208827160] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:00:34,919 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:00:34,919 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [38] imperfect sequences [] total 38 [2022-01-31 21:00:34,919 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [657350138] [2022-01-31 21:00:34,919 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:00:34,919 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-01-31 21:00:34,919 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:00:34,919 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-01-31 21:00:34,920 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=1521, Unknown=0, NotChecked=0, Total=1640 [2022-01-31 21:00:34,920 INFO L87 Difference]: Start difference. First operand 75 states and 77 transitions. Second operand has 38 states, 37 states have (on average 1.864864864864865) internal successors, (69), 36 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) [2022-01-31 21:00:35,909 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:00:35,910 INFO L93 Difference]: Finished difference Result 84 states and 89 transitions. [2022-01-31 21:00:35,910 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-01-31 21:00:35,910 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 37 states have (on average 1.864864864864865) internal successors, (69), 36 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 [2022-01-31 21:00:35,910 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:00:35,911 INFO L225 Difference]: With dead ends: 84 [2022-01-31 21:00:35,911 INFO L226 Difference]: Without dead ends: 77 [2022-01-31 21:00:35,912 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 34 SyntacticMatches, 1 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 724 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=283, Invalid=4973, Unknown=0, NotChecked=0, Total=5256 [2022-01-31 21:00:35,914 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 40 mSDsluCounter, 172 mSDsCounter, 0 mSdLazyCounter, 2418 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 183 SdHoareTripleChecker+Invalid, 2455 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 2418 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-01-31 21:00:35,915 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 183 Invalid, 2455 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 2418 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-01-31 21:00:35,915 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2022-01-31 21:00:35,925 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 77. [2022-01-31 21:00:35,932 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) [2022-01-31 21:00:35,932 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 79 transitions. [2022-01-31 21:00:35,932 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 79 transitions. Word has length 73 [2022-01-31 21:00:35,932 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:00:35,933 INFO L470 AbstractCegarLoop]: Abstraction has 77 states and 79 transitions. [2022-01-31 21:00:35,933 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 37 states have (on average 1.864864864864865) internal successors, (69), 36 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) [2022-01-31 21:00:35,933 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 79 transitions. [2022-01-31 21:00:35,933 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2022-01-31 21:00:35,933 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:00:35,933 INFO L514 BasicCegarLoop]: trace histogram [32, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:00:35,933 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2022-01-31 21:00:35,933 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:00:35,934 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:00:35,934 INFO L85 PathProgramCache]: Analyzing trace with hash 1316930232, now seen corresponding path program 31 times [2022-01-31 21:00:35,934 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:00:35,934 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [870057006] [2022-01-31 21:00:35,934 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:00:35,958 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:35,991 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:35,992 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:36,036 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:36,053 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:36,053 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:36,053 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:00:36,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:36,112 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:00:36,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:36,114 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:00:36,618 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:00:36,618 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [870057006] [2022-01-31 21:00:36,618 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [870057006] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:00:36,618 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:00:36,618 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [39] imperfect sequences [] total 39 [2022-01-31 21:00:36,618 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [807876881] [2022-01-31 21:00:36,618 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:00:36,618 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2022-01-31 21:00:36,618 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:00:36,619 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2022-01-31 21:00:36,619 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=1600, Unknown=0, NotChecked=0, Total=1722 [2022-01-31 21:00:36,619 INFO L87 Difference]: Start difference. First operand 77 states and 79 transitions. Second operand has 39 states, 38 states have (on average 1.868421052631579) internal successors, (71), 37 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) [2022-01-31 21:00:37,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:00:37,688 INFO L93 Difference]: Finished difference Result 86 states and 91 transitions. [2022-01-31 21:00:37,688 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-01-31 21:00:37,688 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 38 states have (on average 1.868421052631579) internal successors, (71), 37 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 [2022-01-31 21:00:37,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:00:37,689 INFO L225 Difference]: With dead ends: 86 [2022-01-31 21:00:37,689 INFO L226 Difference]: Without dead ends: 79 [2022-01-31 21:00:37,690 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 763 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=291, Invalid=5259, Unknown=0, NotChecked=0, Total=5550 [2022-01-31 21:00:37,690 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 41 mSDsluCounter, 182 mSDsCounter, 0 mSdLazyCounter, 2628 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 193 SdHoareTripleChecker+Invalid, 2666 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 2628 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-01-31 21:00:37,690 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [41 Valid, 193 Invalid, 2666 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 2628 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-01-31 21:00:37,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2022-01-31 21:00:37,693 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2022-01-31 21:00:37,693 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) [2022-01-31 21:00:37,693 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 81 transitions. [2022-01-31 21:00:37,693 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 81 transitions. Word has length 75 [2022-01-31 21:00:37,694 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:00:37,694 INFO L470 AbstractCegarLoop]: Abstraction has 79 states and 81 transitions. [2022-01-31 21:00:37,694 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 38 states have (on average 1.868421052631579) internal successors, (71), 37 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) [2022-01-31 21:00:37,694 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 81 transitions. [2022-01-31 21:00:37,694 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2022-01-31 21:00:37,694 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:00:37,694 INFO L514 BasicCegarLoop]: trace histogram [33, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:00:37,694 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2022-01-31 21:00:37,694 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:00:37,695 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:00:37,695 INFO L85 PathProgramCache]: Analyzing trace with hash -375727085, now seen corresponding path program 32 times [2022-01-31 21:00:37,695 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:00:37,695 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [512744412] [2022-01-31 21:00:37,695 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:00:37,720 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:37,766 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:37,766 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:37,813 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:37,836 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:37,836 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:37,836 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:00:37,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:37,883 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:00:37,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:37,886 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:00:38,690 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:00:38,691 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [512744412] [2022-01-31 21:00:38,691 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [512744412] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:00:38,691 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:00:38,691 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [40] imperfect sequences [] total 40 [2022-01-31 21:00:38,691 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [553233833] [2022-01-31 21:00:38,691 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:00:38,691 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-01-31 21:00:38,691 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:00:38,692 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-01-31 21:00:38,692 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=1681, Unknown=0, NotChecked=0, Total=1806 [2022-01-31 21:00:38,692 INFO L87 Difference]: Start difference. First operand 79 states and 81 transitions. Second operand has 40 states, 39 states have (on average 1.8717948717948718) internal successors, (73), 38 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) [2022-01-31 21:00:40,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:00:40,308 INFO L93 Difference]: Finished difference Result 88 states and 93 transitions. [2022-01-31 21:00:40,308 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-01-31 21:00:40,308 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 39 states have (on average 1.8717948717948718) internal successors, (73), 38 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 [2022-01-31 21:00:40,309 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:00:40,309 INFO L225 Difference]: With dead ends: 88 [2022-01-31 21:00:40,309 INFO L226 Difference]: Without dead ends: 81 [2022-01-31 21:00:40,310 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 36 SyntacticMatches, 1 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 803 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=299, Invalid=5553, Unknown=0, NotChecked=0, Total=5852 [2022-01-31 21:00:40,311 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 42 mSDsluCounter, 182 mSDsCounter, 0 mSdLazyCounter, 2704 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 193 SdHoareTripleChecker+Invalid, 2743 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 2704 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-01-31 21:00:40,311 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [42 Valid, 193 Invalid, 2743 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 2704 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-01-31 21:00:40,311 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2022-01-31 21:00:40,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 81. [2022-01-31 21:00:40,314 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) [2022-01-31 21:00:40,314 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 83 transitions. [2022-01-31 21:00:40,314 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 83 transitions. Word has length 77 [2022-01-31 21:00:40,314 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:00:40,314 INFO L470 AbstractCegarLoop]: Abstraction has 81 states and 83 transitions. [2022-01-31 21:00:40,315 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 39 states have (on average 1.8717948717948718) internal successors, (73), 38 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) [2022-01-31 21:00:40,315 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 83 transitions. [2022-01-31 21:00:40,315 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-01-31 21:00:40,315 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:00:40,315 INFO L514 BasicCegarLoop]: trace histogram [34, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:00:40,315 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2022-01-31 21:00:40,315 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:00:40,315 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:00:40,315 INFO L85 PathProgramCache]: Analyzing trace with hash 773196462, now seen corresponding path program 33 times [2022-01-31 21:00:40,316 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:00:40,316 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1628809358] [2022-01-31 21:00:40,316 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:00:40,346 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:40,388 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:40,388 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:40,432 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:40,449 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:40,449 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:40,449 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:00:40,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:40,520 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:00:40,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:40,523 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:00:41,075 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:00:41,075 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1628809358] [2022-01-31 21:00:41,075 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1628809358] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:00:41,075 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:00:41,075 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [41] imperfect sequences [] total 41 [2022-01-31 21:00:41,075 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1917764365] [2022-01-31 21:00:41,075 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:00:41,076 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2022-01-31 21:00:41,076 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:00:41,076 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2022-01-31 21:00:41,077 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=1764, Unknown=0, NotChecked=0, Total=1892 [2022-01-31 21:00:41,077 INFO L87 Difference]: Start difference. First operand 81 states and 83 transitions. Second operand has 41 states, 40 states have (on average 1.875) internal successors, (75), 39 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) [2022-01-31 21:00:42,252 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:00:42,252 INFO L93 Difference]: Finished difference Result 90 states and 95 transitions. [2022-01-31 21:00:42,252 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-01-31 21:00:42,253 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 40 states have (on average 1.875) internal successors, (75), 39 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 [2022-01-31 21:00:42,253 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:00:42,253 INFO L225 Difference]: With dead ends: 90 [2022-01-31 21:00:42,253 INFO L226 Difference]: Without dead ends: 83 [2022-01-31 21:00:42,254 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 37 SyntacticMatches, 1 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 844 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=307, Invalid=5855, Unknown=0, NotChecked=0, Total=6162 [2022-01-31 21:00:42,255 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 43 mSDsluCounter, 187 mSDsCounter, 0 mSdLazyCounter, 2853 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 198 SdHoareTripleChecker+Invalid, 2893 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 2853 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-01-31 21:00:42,255 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [43 Valid, 198 Invalid, 2893 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 2853 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-01-31 21:00:42,255 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2022-01-31 21:00:42,258 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 83. [2022-01-31 21:00:42,258 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) [2022-01-31 21:00:42,258 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 85 transitions. [2022-01-31 21:00:42,258 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 85 transitions. Word has length 79 [2022-01-31 21:00:42,258 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:00:42,258 INFO L470 AbstractCegarLoop]: Abstraction has 83 states and 85 transitions. [2022-01-31 21:00:42,259 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 40 states have (on average 1.875) internal successors, (75), 39 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) [2022-01-31 21:00:42,259 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 85 transitions. [2022-01-31 21:00:42,259 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2022-01-31 21:00:42,259 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:00:42,259 INFO L514 BasicCegarLoop]: trace histogram [35, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:00:42,259 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2022-01-31 21:00:42,259 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:00:42,259 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:00:42,259 INFO L85 PathProgramCache]: Analyzing trace with hash 1082130057, now seen corresponding path program 34 times [2022-01-31 21:00:42,260 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:00:42,260 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [246333999] [2022-01-31 21:00:42,260 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:00:42,295 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:42,323 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:42,323 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:42,354 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:42,371 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:42,371 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:42,371 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:00:42,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:42,432 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:00:42,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:42,439 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:00:43,035 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:00:43,035 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [246333999] [2022-01-31 21:00:43,036 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [246333999] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:00:43,036 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:00:43,036 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [42] imperfect sequences [] total 42 [2022-01-31 21:00:43,036 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1590232126] [2022-01-31 21:00:43,036 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:00:43,036 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2022-01-31 21:00:43,036 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:00:43,036 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2022-01-31 21:00:43,037 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=1849, Unknown=0, NotChecked=0, Total=1980 [2022-01-31 21:00:43,037 INFO L87 Difference]: Start difference. First operand 83 states and 85 transitions. Second operand has 42 states, 41 states have (on average 1.8780487804878048) internal successors, (77), 40 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) [2022-01-31 21:00:44,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:00:44,240 INFO L93 Difference]: Finished difference Result 92 states and 97 transitions. [2022-01-31 21:00:44,240 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2022-01-31 21:00:44,240 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 41 states have (on average 1.8780487804878048) internal successors, (77), 40 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 [2022-01-31 21:00:44,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:00:44,241 INFO L225 Difference]: With dead ends: 92 [2022-01-31 21:00:44,241 INFO L226 Difference]: Without dead ends: 85 [2022-01-31 21:00:44,242 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 38 SyntacticMatches, 1 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 886 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=315, Invalid=6165, Unknown=0, NotChecked=0, Total=6480 [2022-01-31 21:00:44,243 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 44 mSDsluCounter, 197 mSDsCounter, 0 mSdLazyCounter, 3081 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 208 SdHoareTripleChecker+Invalid, 3122 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 3081 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-01-31 21:00:44,243 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 208 Invalid, 3122 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 3081 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-01-31 21:00:44,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2022-01-31 21:00:44,258 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 85. [2022-01-31 21:00:44,258 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) [2022-01-31 21:00:44,258 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 87 transitions. [2022-01-31 21:00:44,259 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 87 transitions. Word has length 81 [2022-01-31 21:00:44,259 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:00:44,259 INFO L470 AbstractCegarLoop]: Abstraction has 85 states and 87 transitions. [2022-01-31 21:00:44,259 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 41 states have (on average 1.8780487804878048) internal successors, (77), 40 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) [2022-01-31 21:00:44,259 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 87 transitions. [2022-01-31 21:00:44,259 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2022-01-31 21:00:44,259 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:00:44,259 INFO L514 BasicCegarLoop]: trace histogram [36, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:00:44,260 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2022-01-31 21:00:44,260 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:00:44,260 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:00:44,260 INFO L85 PathProgramCache]: Analyzing trace with hash 1614571428, now seen corresponding path program 35 times [2022-01-31 21:00:44,260 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:00:44,260 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [910945450] [2022-01-31 21:00:44,260 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:00:44,274 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:44,298 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:44,299 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:44,341 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:44,355 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:44,356 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:44,356 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:00:44,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:44,428 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:00:44,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:44,431 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:00:45,351 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:00:45,351 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [910945450] [2022-01-31 21:00:45,351 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [910945450] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:00:45,351 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:00:45,351 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [43] imperfect sequences [] total 43 [2022-01-31 21:00:45,351 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [527925499] [2022-01-31 21:00:45,351 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:00:45,352 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2022-01-31 21:00:45,352 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:00:45,352 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2022-01-31 21:00:45,352 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=1936, Unknown=0, NotChecked=0, Total=2070 [2022-01-31 21:00:45,352 INFO L87 Difference]: Start difference. First operand 85 states and 87 transitions. Second operand has 43 states, 42 states have (on average 1.880952380952381) internal successors, (79), 41 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) [2022-01-31 21:00:47,264 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:00:47,264 INFO L93 Difference]: Finished difference Result 94 states and 99 transitions. [2022-01-31 21:00:47,264 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-01-31 21:00:47,264 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 42 states have (on average 1.880952380952381) internal successors, (79), 41 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 [2022-01-31 21:00:47,264 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:00:47,265 INFO L225 Difference]: With dead ends: 94 [2022-01-31 21:00:47,265 INFO L226 Difference]: Without dead ends: 87 [2022-01-31 21:00:47,266 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 39 SyntacticMatches, 1 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 929 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=323, Invalid=6483, Unknown=0, NotChecked=0, Total=6806 [2022-01-31 21:00:47,266 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 45 mSDsluCounter, 197 mSDsCounter, 0 mSdLazyCounter, 3163 mSolverCounterSat, 42 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 208 SdHoareTripleChecker+Invalid, 3205 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 42 IncrementalHoareTripleChecker+Valid, 3163 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:00:47,266 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [45 Valid, 208 Invalid, 3205 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [42 Valid, 3163 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-01-31 21:00:47,266 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2022-01-31 21:00:47,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 87. [2022-01-31 21:00:47,269 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) [2022-01-31 21:00:47,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 89 transitions. [2022-01-31 21:00:47,270 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 89 transitions. Word has length 83 [2022-01-31 21:00:47,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:00:47,270 INFO L470 AbstractCegarLoop]: Abstraction has 87 states and 89 transitions. [2022-01-31 21:00:47,270 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 42 states have (on average 1.880952380952381) internal successors, (79), 41 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) [2022-01-31 21:00:47,270 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 89 transitions. [2022-01-31 21:00:47,270 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2022-01-31 21:00:47,270 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:00:47,270 INFO L514 BasicCegarLoop]: trace histogram [37, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:00:47,270 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2022-01-31 21:00:47,271 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:00:47,271 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:00:47,271 INFO L85 PathProgramCache]: Analyzing trace with hash -2105346561, now seen corresponding path program 36 times [2022-01-31 21:00:47,271 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:00:47,271 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1178058403] [2022-01-31 21:00:47,271 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:00:47,287 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:47,343 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:47,344 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:47,380 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:47,397 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:47,397 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:47,397 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:00:47,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:47,442 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:00:47,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:47,447 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:00:48,064 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:00:48,064 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1178058403] [2022-01-31 21:00:48,065 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1178058403] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:00:48,065 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:00:48,065 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [44] imperfect sequences [] total 44 [2022-01-31 21:00:48,065 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2142237366] [2022-01-31 21:00:48,065 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:00:48,065 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2022-01-31 21:00:48,066 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:00:48,066 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2022-01-31 21:00:48,066 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=137, Invalid=2025, Unknown=0, NotChecked=0, Total=2162 [2022-01-31 21:00:48,066 INFO L87 Difference]: Start difference. First operand 87 states and 89 transitions. Second operand has 44 states, 43 states have (on average 1.8837209302325582) internal successors, (81), 42 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) [2022-01-31 21:00:49,695 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:00:49,695 INFO L93 Difference]: Finished difference Result 96 states and 101 transitions. [2022-01-31 21:00:49,696 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2022-01-31 21:00:49,696 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 43 states have (on average 1.8837209302325582) internal successors, (81), 42 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 [2022-01-31 21:00:49,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:00:49,696 INFO L225 Difference]: With dead ends: 96 [2022-01-31 21:00:49,696 INFO L226 Difference]: Without dead ends: 89 [2022-01-31 21:00:49,697 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 40 SyntacticMatches, 1 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 973 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=331, Invalid=6809, Unknown=0, NotChecked=0, Total=7140 [2022-01-31 21:00:49,697 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 46 mSDsluCounter, 207 mSDsCounter, 0 mSdLazyCounter, 3403 mSolverCounterSat, 43 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 218 SdHoareTripleChecker+Invalid, 3446 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 43 IncrementalHoareTripleChecker+Valid, 3403 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-01-31 21:00:49,697 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [46 Valid, 218 Invalid, 3446 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [43 Valid, 3403 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-01-31 21:00:49,698 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2022-01-31 21:00:49,701 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 89. [2022-01-31 21:00:49,701 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) [2022-01-31 21:00:49,701 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 91 transitions. [2022-01-31 21:00:49,701 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 91 transitions. Word has length 85 [2022-01-31 21:00:49,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:00:49,701 INFO L470 AbstractCegarLoop]: Abstraction has 89 states and 91 transitions. [2022-01-31 21:00:49,701 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 43 states have (on average 1.8837209302325582) internal successors, (81), 42 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) [2022-01-31 21:00:49,701 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 91 transitions. [2022-01-31 21:00:49,702 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2022-01-31 21:00:49,702 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:00:49,702 INFO L514 BasicCegarLoop]: trace histogram [38, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:00:49,702 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2022-01-31 21:00:49,702 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:00:49,702 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:00:49,702 INFO L85 PathProgramCache]: Analyzing trace with hash 761223578, now seen corresponding path program 37 times [2022-01-31 21:00:49,702 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:00:49,702 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [378906994] [2022-01-31 21:00:49,703 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:00:49,719 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:49,753 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:49,753 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:49,784 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:49,795 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:49,795 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:49,795 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:00:49,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:49,851 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:00:49,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:49,854 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:00:50,633 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:00:50,633 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [378906994] [2022-01-31 21:00:50,633 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [378906994] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:00:50,633 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:00:50,633 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [45] imperfect sequences [] total 45 [2022-01-31 21:00:50,633 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [488109572] [2022-01-31 21:00:50,634 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:00:50,634 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2022-01-31 21:00:50,634 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:00:50,634 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2022-01-31 21:00:50,634 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=2116, Unknown=0, NotChecked=0, Total=2256 [2022-01-31 21:00:50,634 INFO L87 Difference]: Start difference. First operand 89 states and 91 transitions. Second operand has 45 states, 44 states have (on average 1.8863636363636365) internal successors, (83), 43 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) [2022-01-31 21:00:52,306 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:00:52,307 INFO L93 Difference]: Finished difference Result 98 states and 103 transitions. [2022-01-31 21:00:52,307 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2022-01-31 21:00:52,307 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 44 states have (on average 1.8863636363636365) internal successors, (83), 43 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 [2022-01-31 21:00:52,307 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:00:52,308 INFO L225 Difference]: With dead ends: 98 [2022-01-31 21:00:52,308 INFO L226 Difference]: Without dead ends: 91 [2022-01-31 21:00:52,309 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 41 SyntacticMatches, 1 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1018 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=339, Invalid=7143, Unknown=0, NotChecked=0, Total=7482 [2022-01-31 21:00:52,309 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 47 mSDsluCounter, 207 mSDsCounter, 0 mSdLazyCounter, 3489 mSolverCounterSat, 44 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 218 SdHoareTripleChecker+Invalid, 3533 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 44 IncrementalHoareTripleChecker+Valid, 3489 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-01-31 21:00:52,309 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [47 Valid, 218 Invalid, 3533 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [44 Valid, 3489 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-01-31 21:00:52,309 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2022-01-31 21:00:52,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2022-01-31 21:00:52,312 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) [2022-01-31 21:00:52,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 93 transitions. [2022-01-31 21:00:52,313 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 93 transitions. Word has length 87 [2022-01-31 21:00:52,313 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:00:52,313 INFO L470 AbstractCegarLoop]: Abstraction has 91 states and 93 transitions. [2022-01-31 21:00:52,313 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 44 states have (on average 1.8863636363636365) internal successors, (83), 43 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) [2022-01-31 21:00:52,313 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 93 transitions. [2022-01-31 21:00:52,313 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2022-01-31 21:00:52,313 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:00:52,314 INFO L514 BasicCegarLoop]: trace histogram [39, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:00:52,314 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2022-01-31 21:00:52,314 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:00:52,314 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:00:52,314 INFO L85 PathProgramCache]: Analyzing trace with hash -1833876875, now seen corresponding path program 38 times [2022-01-31 21:00:52,314 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:00:52,314 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [21920622] [2022-01-31 21:00:52,314 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:00:52,329 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:52,362 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:52,362 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:52,390 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:52,406 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:52,406 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:52,406 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:00:52,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:52,480 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:00:52,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:52,483 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:00:53,445 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:00:53,446 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [21920622] [2022-01-31 21:00:53,446 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [21920622] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:00:53,446 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:00:53,446 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [46] imperfect sequences [] total 46 [2022-01-31 21:00:53,446 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [431733035] [2022-01-31 21:00:53,446 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:00:53,446 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2022-01-31 21:00:53,446 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:00:53,448 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2022-01-31 21:00:53,448 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=2209, Unknown=0, NotChecked=0, Total=2352 [2022-01-31 21:00:53,449 INFO L87 Difference]: Start difference. First operand 91 states and 93 transitions. Second operand has 46 states, 45 states have (on average 1.8888888888888888) internal successors, (85), 44 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) [2022-01-31 21:00:54,883 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:00:54,883 INFO L93 Difference]: Finished difference Result 100 states and 105 transitions. [2022-01-31 21:00:54,883 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2022-01-31 21:00:54,884 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 45 states have (on average 1.8888888888888888) internal successors, (85), 44 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 [2022-01-31 21:00:54,884 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:00:54,884 INFO L225 Difference]: With dead ends: 100 [2022-01-31 21:00:54,884 INFO L226 Difference]: Without dead ends: 93 [2022-01-31 21:00:54,885 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1064 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=347, Invalid=7485, Unknown=0, NotChecked=0, Total=7832 [2022-01-31 21:00:54,885 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 48 mSDsluCounter, 217 mSDsCounter, 0 mSdLazyCounter, 3741 mSolverCounterSat, 45 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 228 SdHoareTripleChecker+Invalid, 3786 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 45 IncrementalHoareTripleChecker+Valid, 3741 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-01-31 21:00:54,885 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 228 Invalid, 3786 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [45 Valid, 3741 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-01-31 21:00:54,885 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2022-01-31 21:00:54,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 93. [2022-01-31 21:00:54,889 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) [2022-01-31 21:00:54,889 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 95 transitions. [2022-01-31 21:00:54,889 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 95 transitions. Word has length 89 [2022-01-31 21:00:54,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:00:54,889 INFO L470 AbstractCegarLoop]: Abstraction has 93 states and 95 transitions. [2022-01-31 21:00:54,889 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 45 states have (on average 1.8888888888888888) internal successors, (85), 44 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) [2022-01-31 21:00:54,889 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 95 transitions. [2022-01-31 21:00:54,890 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2022-01-31 21:00:54,890 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:00:54,890 INFO L514 BasicCegarLoop]: trace histogram [40, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:00:54,890 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2022-01-31 21:00:54,890 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:00:54,890 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:00:54,890 INFO L85 PathProgramCache]: Analyzing trace with hash -349413232, now seen corresponding path program 39 times [2022-01-31 21:00:54,890 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:00:54,890 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [831917627] [2022-01-31 21:00:54,891 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:00:54,933 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:54,973 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:54,973 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:55,003 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:55,015 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:55,015 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:55,016 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:00:55,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:55,092 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:00:55,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:55,095 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:00:55,976 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:00:55,976 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [831917627] [2022-01-31 21:00:55,976 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [831917627] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:00:55,976 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:00:55,976 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [47] imperfect sequences [] total 47 [2022-01-31 21:00:55,976 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1677165093] [2022-01-31 21:00:55,976 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:00:55,977 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2022-01-31 21:00:55,977 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:00:55,977 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2022-01-31 21:00:55,977 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=146, Invalid=2304, Unknown=0, NotChecked=0, Total=2450 [2022-01-31 21:00:55,977 INFO L87 Difference]: Start difference. First operand 93 states and 95 transitions. Second operand has 47 states, 46 states have (on average 1.891304347826087) internal successors, (87), 45 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) [2022-01-31 21:00:57,614 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:00:57,615 INFO L93 Difference]: Finished difference Result 102 states and 107 transitions. [2022-01-31 21:00:57,615 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2022-01-31 21:00:57,615 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 46 states have (on average 1.891304347826087) internal successors, (87), 45 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 [2022-01-31 21:00:57,615 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:00:57,616 INFO L225 Difference]: With dead ends: 102 [2022-01-31 21:00:57,616 INFO L226 Difference]: Without dead ends: 95 [2022-01-31 21:00:57,616 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 43 SyntacticMatches, 1 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1111 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=355, Invalid=7835, Unknown=0, NotChecked=0, Total=8190 [2022-01-31 21:00:57,616 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 49 mSDsluCounter, 222 mSDsCounter, 0 mSdLazyCounter, 3916 mSolverCounterSat, 46 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 233 SdHoareTripleChecker+Invalid, 3962 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 46 IncrementalHoareTripleChecker+Valid, 3916 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-01-31 21:00:57,617 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [49 Valid, 233 Invalid, 3962 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [46 Valid, 3916 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-01-31 21:00:57,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2022-01-31 21:00:57,620 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 95. [2022-01-31 21:00:57,620 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) [2022-01-31 21:00:57,620 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 97 transitions. [2022-01-31 21:00:57,620 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 97 transitions. Word has length 91 [2022-01-31 21:00:57,620 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:00:57,620 INFO L470 AbstractCegarLoop]: Abstraction has 95 states and 97 transitions. [2022-01-31 21:00:57,621 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 46 states have (on average 1.891304347826087) internal successors, (87), 45 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) [2022-01-31 21:00:57,621 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 97 transitions. [2022-01-31 21:00:57,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2022-01-31 21:00:57,621 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:00:57,621 INFO L514 BasicCegarLoop]: trace histogram [41, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:00:57,621 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2022-01-31 21:00:57,621 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:00:57,621 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:00:57,621 INFO L85 PathProgramCache]: Analyzing trace with hash 291005419, now seen corresponding path program 40 times [2022-01-31 21:00:57,621 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:00:57,622 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1153453696] [2022-01-31 21:00:57,622 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:00:57,640 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:57,686 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:57,686 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:57,732 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:57,748 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:00:57,749 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:00:57,749 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:00:57,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:57,811 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:00:57,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:00:57,814 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:00:58,762 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:00:58,763 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1153453696] [2022-01-31 21:00:58,763 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1153453696] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:00:58,763 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:00:58,763 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [48] imperfect sequences [] total 48 [2022-01-31 21:00:58,763 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1228385391] [2022-01-31 21:00:58,763 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:00:58,763 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2022-01-31 21:00:58,763 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:00:58,763 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2022-01-31 21:00:58,764 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=2401, Unknown=0, NotChecked=0, Total=2550 [2022-01-31 21:00:58,764 INFO L87 Difference]: Start difference. First operand 95 states and 97 transitions. Second operand has 48 states, 47 states have (on average 1.8936170212765957) internal successors, (89), 46 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) [2022-01-31 21:01:01,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:01:01,112 INFO L93 Difference]: Finished difference Result 104 states and 109 transitions. [2022-01-31 21:01:01,113 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2022-01-31 21:01:01,113 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 47 states have (on average 1.8936170212765957) internal successors, (89), 46 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 [2022-01-31 21:01:01,113 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:01:01,113 INFO L225 Difference]: With dead ends: 104 [2022-01-31 21:01:01,113 INFO L226 Difference]: Without dead ends: 97 [2022-01-31 21:01:01,114 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 44 SyntacticMatches, 1 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1159 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=363, Invalid=8193, Unknown=0, NotChecked=0, Total=8556 [2022-01-31 21:01:01,115 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 50 mSDsluCounter, 222 mSDsCounter, 0 mSdLazyCounter, 4008 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 233 SdHoareTripleChecker+Invalid, 4055 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 4008 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:01:01,115 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [50 Valid, 233 Invalid, 4055 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 4008 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2022-01-31 21:01:01,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2022-01-31 21:01:01,118 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 97. [2022-01-31 21:01:01,119 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) [2022-01-31 21:01:01,119 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 99 transitions. [2022-01-31 21:01:01,119 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 99 transitions. Word has length 93 [2022-01-31 21:01:01,119 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:01:01,119 INFO L470 AbstractCegarLoop]: Abstraction has 97 states and 99 transitions. [2022-01-31 21:01:01,119 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 47 states have (on average 1.8936170212765957) internal successors, (89), 46 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) [2022-01-31 21:01:01,119 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 99 transitions. [2022-01-31 21:01:01,120 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2022-01-31 21:01:01,120 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:01:01,120 INFO L514 BasicCegarLoop]: trace histogram [42, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:01:01,120 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2022-01-31 21:01:01,120 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:01:01,120 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:01:01,120 INFO L85 PathProgramCache]: Analyzing trace with hash 1553005702, now seen corresponding path program 41 times [2022-01-31 21:01:01,120 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:01:01,120 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [767874532] [2022-01-31 21:01:01,120 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:01:01,134 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:01,167 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:01,167 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:01:01,203 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:01,224 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:01,224 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:01:01,224 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:01:01,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:01:01,292 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:01:01,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:01:01,294 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:01:02,075 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:01:02,075 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [767874532] [2022-01-31 21:01:02,075 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [767874532] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:01:02,076 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:01:02,076 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [49] imperfect sequences [] total 49 [2022-01-31 21:01:02,076 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1281746978] [2022-01-31 21:01:02,076 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:01:02,076 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2022-01-31 21:01:02,076 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:01:02,076 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2022-01-31 21:01:02,077 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=152, Invalid=2500, Unknown=0, NotChecked=0, Total=2652 [2022-01-31 21:01:02,077 INFO L87 Difference]: Start difference. First operand 97 states and 99 transitions. Second operand has 49 states, 48 states have (on average 1.8958333333333333) internal successors, (91), 47 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) [2022-01-31 21:01:04,064 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:01:04,064 INFO L93 Difference]: Finished difference Result 106 states and 111 transitions. [2022-01-31 21:01:04,065 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2022-01-31 21:01:04,065 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 48 states have (on average 1.8958333333333333) internal successors, (91), 47 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 [2022-01-31 21:01:04,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:01:04,065 INFO L225 Difference]: With dead ends: 106 [2022-01-31 21:01:04,065 INFO L226 Difference]: Without dead ends: 99 [2022-01-31 21:01:04,066 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 45 SyntacticMatches, 1 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1208 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=371, Invalid=8559, Unknown=0, NotChecked=0, Total=8930 [2022-01-31 21:01:04,066 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 51 mSDsluCounter, 232 mSDsCounter, 0 mSdLazyCounter, 4278 mSolverCounterSat, 48 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 243 SdHoareTripleChecker+Invalid, 4326 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 48 IncrementalHoareTripleChecker+Valid, 4278 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:01:04,067 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [51 Valid, 243 Invalid, 4326 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [48 Valid, 4278 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-01-31 21:01:04,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2022-01-31 21:01:04,070 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 99. [2022-01-31 21:01:04,070 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) [2022-01-31 21:01:04,071 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 101 transitions. [2022-01-31 21:01:04,071 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 101 transitions. Word has length 95 [2022-01-31 21:01:04,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:01:04,071 INFO L470 AbstractCegarLoop]: Abstraction has 99 states and 101 transitions. [2022-01-31 21:01:04,071 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 48 states have (on average 1.8958333333333333) internal successors, (91), 47 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) [2022-01-31 21:01:04,071 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 101 transitions. [2022-01-31 21:01:04,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2022-01-31 21:01:04,071 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:01:04,071 INFO L514 BasicCegarLoop]: trace histogram [43, 42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:01:04,072 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2022-01-31 21:01:04,072 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:01:04,072 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:01:04,072 INFO L85 PathProgramCache]: Analyzing trace with hash -1140467103, now seen corresponding path program 42 times [2022-01-31 21:01:04,072 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:01:04,072 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1093334368] [2022-01-31 21:01:04,072 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:01:04,097 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:04,143 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:04,143 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:01:04,188 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:04,205 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:04,205 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:01:04,205 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:01:04,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:01:04,251 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:01:04,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:01:04,253 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:01:05,050 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:01:05,051 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1093334368] [2022-01-31 21:01:05,051 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1093334368] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:01:05,051 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:01:05,051 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [50] imperfect sequences [] total 50 [2022-01-31 21:01:05,051 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2089179337] [2022-01-31 21:01:05,051 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:01:05,053 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2022-01-31 21:01:05,053 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:01:05,053 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2022-01-31 21:01:05,055 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=2601, Unknown=0, NotChecked=0, Total=2756 [2022-01-31 21:01:05,055 INFO L87 Difference]: Start difference. First operand 99 states and 101 transitions. Second operand has 50 states, 49 states have (on average 1.8979591836734695) internal successors, (93), 48 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) [2022-01-31 21:01:07,153 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:01:07,153 INFO L93 Difference]: Finished difference Result 108 states and 113 transitions. [2022-01-31 21:01:07,153 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2022-01-31 21:01:07,154 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 49 states have (on average 1.8979591836734695) internal successors, (93), 48 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 [2022-01-31 21:01:07,154 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:01:07,154 INFO L225 Difference]: With dead ends: 108 [2022-01-31 21:01:07,154 INFO L226 Difference]: Without dead ends: 101 [2022-01-31 21:01:07,155 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1258 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=379, Invalid=8933, Unknown=0, NotChecked=0, Total=9312 [2022-01-31 21:01:07,155 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 52 mSDsluCounter, 237 mSDsCounter, 0 mSdLazyCounter, 4465 mSolverCounterSat, 49 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 248 SdHoareTripleChecker+Invalid, 4514 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 49 IncrementalHoareTripleChecker+Valid, 4465 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-01-31 21:01:07,157 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [52 Valid, 248 Invalid, 4514 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [49 Valid, 4465 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2022-01-31 21:01:07,158 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2022-01-31 21:01:07,178 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 101. [2022-01-31 21:01:07,178 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) [2022-01-31 21:01:07,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 103 transitions. [2022-01-31 21:01:07,179 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 103 transitions. Word has length 97 [2022-01-31 21:01:07,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:01:07,179 INFO L470 AbstractCegarLoop]: Abstraction has 101 states and 103 transitions. [2022-01-31 21:01:07,179 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 49 states have (on average 1.8979591836734695) internal successors, (93), 48 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) [2022-01-31 21:01:07,179 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 103 transitions. [2022-01-31 21:01:07,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2022-01-31 21:01:07,179 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:01:07,179 INFO L514 BasicCegarLoop]: trace histogram [44, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:01:07,180 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2022-01-31 21:01:07,180 INFO L402 AbstractCegarLoop]: === Iteration 46 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:01:07,180 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:01:07,180 INFO L85 PathProgramCache]: Analyzing trace with hash 297446780, now seen corresponding path program 43 times [2022-01-31 21:01:07,180 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:01:07,180 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2009908235] [2022-01-31 21:01:07,180 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:01:07,201 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:07,231 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:07,232 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:01:07,270 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:07,281 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:07,281 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:01:07,281 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:01:07,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:01:07,330 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:01:07,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:01:07,344 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:01:08,189 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:01:08,189 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2009908235] [2022-01-31 21:01:08,189 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [2009908235] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:01:08,189 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:01:08,189 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [51] imperfect sequences [] total 51 [2022-01-31 21:01:08,189 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1572612896] [2022-01-31 21:01:08,189 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:01:08,189 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2022-01-31 21:01:08,189 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:01:08,190 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2022-01-31 21:01:08,190 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=2704, Unknown=0, NotChecked=0, Total=2862 [2022-01-31 21:01:08,190 INFO L87 Difference]: Start difference. First operand 101 states and 103 transitions. Second operand has 51 states, 50 states have (on average 1.9) internal successors, (95), 49 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) [2022-01-31 21:01:10,222 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:01:10,222 INFO L93 Difference]: Finished difference Result 110 states and 115 transitions. [2022-01-31 21:01:10,222 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2022-01-31 21:01:10,222 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 50 states have (on average 1.9) internal successors, (95), 49 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 [2022-01-31 21:01:10,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:01:10,223 INFO L225 Difference]: With dead ends: 110 [2022-01-31 21:01:10,223 INFO L226 Difference]: Without dead ends: 103 [2022-01-31 21:01:10,223 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 47 SyntacticMatches, 1 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1309 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=387, Invalid=9315, Unknown=0, NotChecked=0, Total=9702 [2022-01-31 21:01:10,225 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 53 mSDsluCounter, 237 mSDsCounter, 0 mSdLazyCounter, 4563 mSolverCounterSat, 50 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 248 SdHoareTripleChecker+Invalid, 4613 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 50 IncrementalHoareTripleChecker+Valid, 4563 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:01:10,225 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [53 Valid, 248 Invalid, 4613 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [50 Valid, 4563 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-01-31 21:01:10,225 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2022-01-31 21:01:10,229 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2022-01-31 21:01:10,229 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) [2022-01-31 21:01:10,229 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 105 transitions. [2022-01-31 21:01:10,229 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 105 transitions. Word has length 99 [2022-01-31 21:01:10,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:01:10,229 INFO L470 AbstractCegarLoop]: Abstraction has 103 states and 105 transitions. [2022-01-31 21:01:10,229 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 50 states have (on average 1.9) internal successors, (95), 49 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) [2022-01-31 21:01:10,230 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 105 transitions. [2022-01-31 21:01:10,230 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2022-01-31 21:01:10,230 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:01:10,230 INFO L514 BasicCegarLoop]: trace histogram [45, 44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:01:10,230 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2022-01-31 21:01:10,230 INFO L402 AbstractCegarLoop]: === Iteration 47 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:01:10,230 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:01:10,231 INFO L85 PathProgramCache]: Analyzing trace with hash -846780969, now seen corresponding path program 44 times [2022-01-31 21:01:10,231 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:01:10,231 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [34565575] [2022-01-31 21:01:10,231 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:01:10,266 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:10,314 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:10,314 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:01:10,358 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:10,374 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:10,374 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:01:10,375 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:01:10,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:01:10,429 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:01:10,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:01:10,431 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:01:11,554 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:01:11,554 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [34565575] [2022-01-31 21:01:11,554 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [34565575] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:01:11,554 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:01:11,554 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [52] imperfect sequences [] total 52 [2022-01-31 21:01:11,554 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1996547137] [2022-01-31 21:01:11,554 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:01:11,554 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2022-01-31 21:01:11,555 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:01:11,555 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2022-01-31 21:01:11,555 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=161, Invalid=2809, Unknown=0, NotChecked=0, Total=2970 [2022-01-31 21:01:11,555 INFO L87 Difference]: Start difference. First operand 103 states and 105 transitions. Second operand has 52 states, 51 states have (on average 1.9019607843137254) internal successors, (97), 50 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) [2022-01-31 21:01:13,387 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:01:13,387 INFO L93 Difference]: Finished difference Result 112 states and 117 transitions. [2022-01-31 21:01:13,387 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2022-01-31 21:01:13,387 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 51 states have (on average 1.9019607843137254) internal successors, (97), 50 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 [2022-01-31 21:01:13,387 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:01:13,388 INFO L225 Difference]: With dead ends: 112 [2022-01-31 21:01:13,388 INFO L226 Difference]: Without dead ends: 105 [2022-01-31 21:01:13,389 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 48 SyntacticMatches, 1 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1361 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=395, Invalid=9705, Unknown=0, NotChecked=0, Total=10100 [2022-01-31 21:01:13,390 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 54 mSDsluCounter, 247 mSDsCounter, 0 mSdLazyCounter, 4851 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 258 SdHoareTripleChecker+Invalid, 4902 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 4851 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-01-31 21:01:13,390 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [54 Valid, 258 Invalid, 4902 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 4851 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-01-31 21:01:13,391 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2022-01-31 21:01:13,394 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 105. [2022-01-31 21:01:13,394 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) [2022-01-31 21:01:13,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 107 transitions. [2022-01-31 21:01:13,395 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 107 transitions. Word has length 101 [2022-01-31 21:01:13,395 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:01:13,395 INFO L470 AbstractCegarLoop]: Abstraction has 105 states and 107 transitions. [2022-01-31 21:01:13,395 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 51 states have (on average 1.9019607843137254) internal successors, (97), 50 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) [2022-01-31 21:01:13,395 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 107 transitions. [2022-01-31 21:01:13,395 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2022-01-31 21:01:13,395 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:01:13,396 INFO L514 BasicCegarLoop]: trace histogram [46, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:01:13,396 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2022-01-31 21:01:13,396 INFO L402 AbstractCegarLoop]: === Iteration 48 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:01:13,396 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:01:13,396 INFO L85 PathProgramCache]: Analyzing trace with hash -938019982, now seen corresponding path program 45 times [2022-01-31 21:01:13,396 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:01:13,396 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [341359436] [2022-01-31 21:01:13,396 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:01:13,436 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:13,474 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:13,475 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:01:13,539 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:13,555 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:13,555 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:01:13,556 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:01:13,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:01:13,611 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:01:13,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:01:13,614 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:01:14,796 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:01:14,796 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [341359436] [2022-01-31 21:01:14,796 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [341359436] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:01:14,796 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:01:14,796 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [53] imperfect sequences [] total 53 [2022-01-31 21:01:14,796 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1920790203] [2022-01-31 21:01:14,796 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:01:14,797 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2022-01-31 21:01:14,797 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:01:14,797 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2022-01-31 21:01:14,797 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=164, Invalid=2916, Unknown=0, NotChecked=0, Total=3080 [2022-01-31 21:01:14,797 INFO L87 Difference]: Start difference. First operand 105 states and 107 transitions. Second operand has 53 states, 52 states have (on average 1.9038461538461537) internal successors, (99), 51 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) [2022-01-31 21:01:16,711 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:01:16,711 INFO L93 Difference]: Finished difference Result 114 states and 119 transitions. [2022-01-31 21:01:16,711 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2022-01-31 21:01:16,711 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 52 states have (on average 1.9038461538461537) internal successors, (99), 51 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 [2022-01-31 21:01:16,711 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:01:16,712 INFO L225 Difference]: With dead ends: 114 [2022-01-31 21:01:16,712 INFO L226 Difference]: Without dead ends: 107 [2022-01-31 21:01:16,713 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 49 SyntacticMatches, 1 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1414 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=403, Invalid=10103, Unknown=0, NotChecked=0, Total=10506 [2022-01-31 21:01:16,713 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 55 mSDsluCounter, 252 mSDsCounter, 0 mSdLazyCounter, 5050 mSolverCounterSat, 52 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 263 SdHoareTripleChecker+Invalid, 5102 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 52 IncrementalHoareTripleChecker+Valid, 5050 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-01-31 21:01:16,713 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [55 Valid, 263 Invalid, 5102 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [52 Valid, 5050 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-01-31 21:01:16,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2022-01-31 21:01:16,717 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 107. [2022-01-31 21:01:16,717 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) [2022-01-31 21:01:16,718 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 109 transitions. [2022-01-31 21:01:16,718 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 109 transitions. Word has length 103 [2022-01-31 21:01:16,718 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:01:16,718 INFO L470 AbstractCegarLoop]: Abstraction has 107 states and 109 transitions. [2022-01-31 21:01:16,718 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 52 states have (on average 1.9038461538461537) internal successors, (99), 51 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) [2022-01-31 21:01:16,718 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 109 transitions. [2022-01-31 21:01:16,718 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2022-01-31 21:01:16,718 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:01:16,718 INFO L514 BasicCegarLoop]: trace histogram [47, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:01:16,718 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2022-01-31 21:01:16,719 INFO L402 AbstractCegarLoop]: === Iteration 49 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:01:16,719 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:01:16,719 INFO L85 PathProgramCache]: Analyzing trace with hash 1575601741, now seen corresponding path program 46 times [2022-01-31 21:01:16,719 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:01:16,719 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1531682472] [2022-01-31 21:01:16,719 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:01:16,730 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:16,754 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:16,754 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:01:16,776 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:16,787 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:16,788 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:01:16,788 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:01:16,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:01:16,846 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:01:16,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:01:16,848 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:01:17,860 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:01:17,860 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1531682472] [2022-01-31 21:01:17,860 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1531682472] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:01:17,860 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:01:17,860 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [54] imperfect sequences [] total 54 [2022-01-31 21:01:17,860 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [170240718] [2022-01-31 21:01:17,861 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:01:17,861 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2022-01-31 21:01:17,861 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:01:17,861 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2022-01-31 21:01:17,862 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=167, Invalid=3025, Unknown=0, NotChecked=0, Total=3192 [2022-01-31 21:01:17,862 INFO L87 Difference]: Start difference. First operand 107 states and 109 transitions. Second operand has 54 states, 53 states have (on average 1.9056603773584906) internal successors, (101), 52 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) [2022-01-31 21:01:20,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:01:20,875 INFO L93 Difference]: Finished difference Result 116 states and 121 transitions. [2022-01-31 21:01:20,875 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2022-01-31 21:01:20,875 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 53 states have (on average 1.9056603773584906) internal successors, (101), 52 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 [2022-01-31 21:01:20,876 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:01:20,876 INFO L225 Difference]: With dead ends: 116 [2022-01-31 21:01:20,876 INFO L226 Difference]: Without dead ends: 109 [2022-01-31 21:01:20,877 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 50 SyntacticMatches, 1 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1468 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=411, Invalid=10509, Unknown=0, NotChecked=0, Total=10920 [2022-01-31 21:01:20,877 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 56 mSDsluCounter, 257 mSDsCounter, 0 mSdLazyCounter, 5253 mSolverCounterSat, 53 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 268 SdHoareTripleChecker+Invalid, 5306 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 5253 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2022-01-31 21:01:20,877 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [56 Valid, 268 Invalid, 5306 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [53 Valid, 5253 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2022-01-31 21:01:20,878 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2022-01-31 21:01:20,881 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 109. [2022-01-31 21:01:20,881 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) [2022-01-31 21:01:20,881 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 111 transitions. [2022-01-31 21:01:20,882 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 111 transitions. Word has length 105 [2022-01-31 21:01:20,882 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:01:20,882 INFO L470 AbstractCegarLoop]: Abstraction has 109 states and 111 transitions. [2022-01-31 21:01:20,882 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 53 states have (on average 1.9056603773584906) internal successors, (101), 52 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) [2022-01-31 21:01:20,882 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 111 transitions. [2022-01-31 21:01:20,882 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2022-01-31 21:01:20,882 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:01:20,882 INFO L514 BasicCegarLoop]: trace histogram [48, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:01:20,882 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48 [2022-01-31 21:01:20,883 INFO L402 AbstractCegarLoop]: === Iteration 50 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:01:20,883 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:01:20,883 INFO L85 PathProgramCache]: Analyzing trace with hash -900510104, now seen corresponding path program 47 times [2022-01-31 21:01:20,883 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:01:20,883 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1666733920] [2022-01-31 21:01:20,883 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:01:20,903 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:20,951 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:20,951 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:01:20,976 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:20,989 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:20,989 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:01:20,989 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:01:20,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:01:21,062 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:01:21,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:01:21,064 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:01:22,447 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:01:22,448 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1666733920] [2022-01-31 21:01:22,448 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1666733920] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:01:22,448 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:01:22,448 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [55] imperfect sequences [] total 55 [2022-01-31 21:01:22,448 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [513369122] [2022-01-31 21:01:22,448 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:01:22,448 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2022-01-31 21:01:22,448 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:01:22,449 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2022-01-31 21:01:22,449 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=3136, Unknown=0, NotChecked=0, Total=3306 [2022-01-31 21:01:22,449 INFO L87 Difference]: Start difference. First operand 109 states and 111 transitions. Second operand has 55 states, 54 states have (on average 1.9074074074074074) internal successors, (103), 53 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) [2022-01-31 21:01:24,743 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:01:24,744 INFO L93 Difference]: Finished difference Result 118 states and 123 transitions. [2022-01-31 21:01:24,744 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2022-01-31 21:01:24,744 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 54 states have (on average 1.9074074074074074) internal successors, (103), 53 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 [2022-01-31 21:01:24,744 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:01:24,745 INFO L225 Difference]: With dead ends: 118 [2022-01-31 21:01:24,745 INFO L226 Difference]: Without dead ends: 111 [2022-01-31 21:01:24,746 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 51 SyntacticMatches, 1 SemanticMatches, 105 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1523 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=419, Invalid=10923, Unknown=0, NotChecked=0, Total=11342 [2022-01-31 21:01:24,746 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 57 mSDsluCounter, 262 mSDsCounter, 0 mSdLazyCounter, 5460 mSolverCounterSat, 54 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 273 SdHoareTripleChecker+Invalid, 5514 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 54 IncrementalHoareTripleChecker+Valid, 5460 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:01:24,746 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [57 Valid, 273 Invalid, 5514 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [54 Valid, 5460 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2022-01-31 21:01:24,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2022-01-31 21:01:24,750 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 111. [2022-01-31 21:01:24,750 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) [2022-01-31 21:01:24,750 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 113 transitions. [2022-01-31 21:01:24,750 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 113 transitions. Word has length 107 [2022-01-31 21:01:24,750 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:01:24,750 INFO L470 AbstractCegarLoop]: Abstraction has 111 states and 113 transitions. [2022-01-31 21:01:24,750 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 54 states have (on average 1.9074074074074074) internal successors, (103), 53 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) [2022-01-31 21:01:24,751 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 113 transitions. [2022-01-31 21:01:24,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2022-01-31 21:01:24,751 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:01:24,751 INFO L514 BasicCegarLoop]: trace histogram [49, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:01:24,751 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable49 [2022-01-31 21:01:24,751 INFO L402 AbstractCegarLoop]: === Iteration 51 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:01:24,751 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:01:24,751 INFO L85 PathProgramCache]: Analyzing trace with hash -1032111165, now seen corresponding path program 48 times [2022-01-31 21:01:24,751 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:01:24,752 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1644721121] [2022-01-31 21:01:24,752 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:01:24,788 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:24,838 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:24,839 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:01:24,880 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:24,891 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:24,891 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:01:24,891 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:01:24,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:01:24,966 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:01:24,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:01:24,968 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:01:25,902 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:01:25,902 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1644721121] [2022-01-31 21:01:25,903 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1644721121] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:01:25,903 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:01:25,903 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [56] imperfect sequences [] total 56 [2022-01-31 21:01:25,903 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [709731839] [2022-01-31 21:01:25,903 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:01:25,903 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2022-01-31 21:01:25,903 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:01:25,903 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2022-01-31 21:01:25,904 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=3249, Unknown=0, NotChecked=0, Total=3422 [2022-01-31 21:01:25,904 INFO L87 Difference]: Start difference. First operand 111 states and 113 transitions. Second operand has 56 states, 55 states have (on average 1.9090909090909092) internal successors, (105), 54 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) [2022-01-31 21:01:28,249 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:01:28,250 INFO L93 Difference]: Finished difference Result 120 states and 125 transitions. [2022-01-31 21:01:28,250 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2022-01-31 21:01:28,250 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 55 states have (on average 1.9090909090909092) internal successors, (105), 54 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 [2022-01-31 21:01:28,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:01:28,251 INFO L225 Difference]: With dead ends: 120 [2022-01-31 21:01:28,251 INFO L226 Difference]: Without dead ends: 113 [2022-01-31 21:01:28,252 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 52 SyntacticMatches, 1 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1579 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=427, Invalid=11345, Unknown=0, NotChecked=0, Total=11772 [2022-01-31 21:01:28,252 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 58 mSDsluCounter, 262 mSDsCounter, 0 mSdLazyCounter, 5568 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 273 SdHoareTripleChecker+Invalid, 5623 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 5568 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:01:28,252 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [58 Valid, 273 Invalid, 5623 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 5568 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2022-01-31 21:01:28,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2022-01-31 21:01:28,256 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 113. [2022-01-31 21:01:28,256 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) [2022-01-31 21:01:28,257 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 115 transitions. [2022-01-31 21:01:28,257 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 115 transitions. Word has length 109 [2022-01-31 21:01:28,257 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:01:28,257 INFO L470 AbstractCegarLoop]: Abstraction has 113 states and 115 transitions. [2022-01-31 21:01:28,257 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 55 states have (on average 1.9090909090909092) internal successors, (105), 54 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) [2022-01-31 21:01:28,257 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 115 transitions. [2022-01-31 21:01:28,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2022-01-31 21:01:28,257 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:01:28,257 INFO L514 BasicCegarLoop]: trace histogram [50, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:01:28,258 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50 [2022-01-31 21:01:28,258 INFO L402 AbstractCegarLoop]: === Iteration 52 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:01:28,258 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:01:28,258 INFO L85 PathProgramCache]: Analyzing trace with hash 1348288094, now seen corresponding path program 49 times [2022-01-31 21:01:28,258 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:01:28,258 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [381057844] [2022-01-31 21:01:28,258 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:01:28,274 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:28,311 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:28,311 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:01:28,342 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:28,353 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:28,353 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:01:28,353 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:01:28,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:01:28,394 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:01:28,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:01:28,397 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:01:29,360 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:01:29,360 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [381057844] [2022-01-31 21:01:29,361 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [381057844] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:01:29,361 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:01:29,361 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [57] imperfect sequences [] total 57 [2022-01-31 21:01:29,361 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1813699003] [2022-01-31 21:01:29,361 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:01:29,361 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 57 states [2022-01-31 21:01:29,361 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:01:29,362 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2022-01-31 21:01:29,362 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=176, Invalid=3364, Unknown=0, NotChecked=0, Total=3540 [2022-01-31 21:01:29,362 INFO L87 Difference]: Start difference. First operand 113 states and 115 transitions. Second operand has 57 states, 56 states have (on average 1.9107142857142858) internal successors, (107), 55 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) [2022-01-31 21:01:31,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:01:31,665 INFO L93 Difference]: Finished difference Result 127 states and 134 transitions. [2022-01-31 21:01:31,665 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2022-01-31 21:01:31,666 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 56 states have (on average 1.9107142857142858) internal successors, (107), 55 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 [2022-01-31 21:01:31,666 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:01:31,671 INFO L225 Difference]: With dead ends: 127 [2022-01-31 21:01:31,671 INFO L226 Difference]: Without dead ends: 117 [2022-01-31 21:01:31,672 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 53 SyntacticMatches, 1 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1897 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=450, Invalid=12432, Unknown=0, NotChecked=0, Total=12882 [2022-01-31 21:01:31,673 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 67 mSDsluCounter, 267 mSDsCounter, 0 mSdLazyCounter, 5938 mSolverCounterSat, 59 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 279 SdHoareTripleChecker+Invalid, 5997 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 59 IncrementalHoareTripleChecker+Valid, 5938 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2022-01-31 21:01:31,673 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [67 Valid, 279 Invalid, 5997 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [59 Valid, 5938 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2022-01-31 21:01:31,673 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2022-01-31 21:01:31,677 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 117. [2022-01-31 21:01:31,677 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117 states, 112 states have (on average 1.0357142857142858) internal successors, (116), 112 states have internal predecessors, (116), 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) [2022-01-31 21:01:31,679 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 120 transitions. [2022-01-31 21:01:31,679 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 120 transitions. Word has length 111 [2022-01-31 21:01:31,679 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:01:31,679 INFO L470 AbstractCegarLoop]: Abstraction has 117 states and 120 transitions. [2022-01-31 21:01:31,679 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 57 states, 56 states have (on average 1.9107142857142858) internal successors, (107), 55 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) [2022-01-31 21:01:31,679 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 120 transitions. [2022-01-31 21:01:31,679 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2022-01-31 21:01:31,679 INFO L506 BasicCegarLoop]: Found error trace [2022-01-31 21:01:31,679 INFO L514 BasicCegarLoop]: trace histogram [52, 51, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-01-31 21:01:31,680 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51 [2022-01-31 21:01:31,680 INFO L402 AbstractCegarLoop]: === Iteration 53 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-01-31 21:01:31,680 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-01-31 21:01:31,680 INFO L85 PathProgramCache]: Analyzing trace with hash -547208364, now seen corresponding path program 50 times [2022-01-31 21:01:31,680 INFO L121 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-01-31 21:01:31,680 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1921499122] [2022-01-31 21:01:31,680 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-01-31 21:01:31,695 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:31,719 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:31,719 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:01:31,740 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:31,751 INFO L87 AcceleratorJordan]: Jordan loop acceleration statistics: 0 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-01-31 21:01:31,751 INFO L236 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-01-31 21:01:31,751 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-01-31 21:01:31,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:01:31,818 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-01-31 21:01:31,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-01-31 21:01:31,821 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-01-31 21:01:33,232 INFO L139 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-01-31 21:01:33,232 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1921499122] [2022-01-31 21:01:33,232 INFO L160 FreeRefinementEngine]: IpTcStrategyModulePreferences [1921499122] provided 1 perfect and 0 imperfect interpolant sequences [2022-01-31 21:01:33,232 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-01-31 21:01:33,232 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [58] imperfect sequences [] total 58 [2022-01-31 21:01:33,232 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [72021084] [2022-01-31 21:01:33,232 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-01-31 21:01:33,232 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2022-01-31 21:01:33,232 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-01-31 21:01:33,233 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2022-01-31 21:01:33,233 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=180, Invalid=3480, Unknown=0, NotChecked=0, Total=3660 [2022-01-31 21:01:33,233 INFO L87 Difference]: Start difference. First operand 117 states and 120 transitions. Second operand has 58 states, 57 states have (on average 1.9473684210526316) internal successors, (111), 56 states have internal predecessors, (111), 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) [2022-01-31 21:01:35,347 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-01-31 21:01:35,347 INFO L93 Difference]: Finished difference Result 118 states and 121 transitions. [2022-01-31 21:01:35,347 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2022-01-31 21:01:35,348 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 57 states have (on average 1.9473684210526316) internal successors, (111), 56 states have internal predecessors, (111), 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 115 [2022-01-31 21:01:35,348 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-01-31 21:01:35,349 INFO L225 Difference]: With dead ends: 118 [2022-01-31 21:01:35,349 INFO L226 Difference]: Without dead ends: 0 [2022-01-31 21:01:35,351 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 56 SyntacticMatches, 1 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1745 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=445, Invalid=12211, Unknown=0, NotChecked=0, Total=12656 [2022-01-31 21:01:35,351 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 51 mSDsluCounter, 272 mSDsCounter, 0 mSdLazyCounter, 5613 mSolverCounterSat, 54 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 278 SdHoareTripleChecker+Invalid, 5667 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 54 IncrementalHoareTripleChecker+Valid, 5613 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-01-31 21:01:35,351 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [51 Valid, 278 Invalid, 5667 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [54 Valid, 5613 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2022-01-31 21:01:35,351 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2022-01-31 21:01:35,351 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2022-01-31 21:01:35,352 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-01-31 21:01:35,352 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2022-01-31 21:01:35,352 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 115 [2022-01-31 21:01:35,352 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-01-31 21:01:35,352 INFO L470 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2022-01-31 21:01:35,352 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 57 states have (on average 1.9473684210526316) internal successors, (111), 56 states have internal predecessors, (111), 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) [2022-01-31 21:01:35,352 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2022-01-31 21:01:35,352 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2022-01-31 21:01:35,355 INFO L764 garLoopResultBuilder]: Registering result SAFE for location __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2022-01-31 21:01:35,355 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52 [2022-01-31 21:01:35,360 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2022-01-31 21:01:36,256 INFO L858 garLoopResultBuilder]: For program point reach_errorEXIT(line 12) no Hoare annotation was computed. [2022-01-31 21:01:36,256 INFO L858 garLoopResultBuilder]: For program point reach_errorENTRY(line 12) no Hoare annotation was computed. [2022-01-31 21:01:36,256 INFO L858 garLoopResultBuilder]: For program point L12-1(line 12) no Hoare annotation was computed. [2022-01-31 21:01:36,256 INFO L858 garLoopResultBuilder]: For program point L15(line 15) no Hoare annotation was computed. [2022-01-31 21:01:36,256 INFO L858 garLoopResultBuilder]: For program point assume_abort_if_notENTRY(lines 14 16) no Hoare annotation was computed. [2022-01-31 21:01:36,256 INFO L858 garLoopResultBuilder]: For program point L15-2(lines 14 16) no Hoare annotation was computed. [2022-01-31 21:01:36,256 INFO L858 garLoopResultBuilder]: For program point assume_abort_if_notEXIT(lines 14 16) no Hoare annotation was computed. [2022-01-31 21:01:36,256 INFO L861 garLoopResultBuilder]: At program point mainENTRY(lines 24 37) the Hoare annotation is: true [2022-01-31 21:01:36,257 INFO L854 garLoopResultBuilder]: At program point L28(lines 28 33) the Hoare annotation is: (let ((.cse0 (<= 50 main_~y~0)) (.cse1 (<= main_~y~0 50))) (or (and (<= main_~y~0 69) (<= 69 main_~y~0) (< main_~x~0 70) (<= 69 main_~x~0)) (and (= main_~x~0 0) .cse0 .cse1) (and (< main_~x~0 76) (<= 75 main_~y~0) (<= 75 main_~x~0) (<= main_~y~0 75)) (and (<= 80 main_~x~0) (<= main_~y~0 80) (< main_~x~0 81) (<= 80 main_~y~0)) (and (< main_~x~0 89) (<= main_~y~0 88) (<= 88 main_~y~0) (<= 88 main_~x~0)) (and (< main_~x~0 85) (<= 84 main_~x~0) (<= main_~y~0 84) (<= 84 main_~y~0)) (and (<= 77 main_~y~0) (< main_~x~0 78) (<= main_~y~0 77) (<= 77 main_~x~0)) (and (<= 63 main_~x~0) (<= 63 main_~y~0) (< main_~x~0 64) (<= main_~y~0 63)) (and (<= 66 main_~y~0) (<= main_~y~0 66) (<= 66 main_~x~0) (< main_~x~0 67)) (and (< main_~x~0 97) (<= 96 main_~y~0) (<= 96 main_~x~0) (<= main_~y~0 96)) (and (<= 74 main_~x~0) (<= 74 main_~y~0) (<= main_~y~0 74) (< main_~x~0 75)) (and (< main_~x~0 77) (<= 76 main_~x~0) (<= main_~y~0 76) (<= 76 main_~y~0)) (and (< main_~x~0 94) (<= 93 main_~y~0) (<= main_~y~0 93) (<= 93 main_~x~0)) (and (<= main_~y~0 57) (<= 57 main_~x~0) (<= 57 main_~y~0) (< main_~x~0 58)) (and (<= 78 main_~y~0) (<= 78 main_~x~0) (< main_~x~0 79) (<= main_~y~0 78)) (and (<= 92 main_~y~0) (<= 92 main_~x~0) (<= main_~y~0 92) (< main_~x~0 93)) (and (< main_~x~0 57) (<= main_~y~0 56) (<= 56 main_~x~0) (<= 56 main_~y~0)) (and .cse0 (or (= main_~x~0 1) (< 1 main_~x~0)) (< main_~x~0 51) .cse1) (and (< main_~x~0 61) (<= 60 main_~y~0) (<= main_~y~0 60) (<= 60 main_~x~0)) (and (<= 90 main_~y~0) (<= main_~y~0 90) (<= 90 main_~x~0) (< main_~x~0 91)) (and (<= 70 main_~x~0) (<= 70 main_~y~0) (<= main_~y~0 70) (< main_~x~0 71)) (and (<= main_~y~0 68) (<= 68 main_~y~0) (<= 68 main_~x~0) (< main_~x~0 69)) (and (<= 81 main_~x~0) (<= main_~y~0 81) (< main_~x~0 82) (<= 81 main_~y~0)) (and (<= 65 main_~y~0) (<= main_~y~0 65) (<= 65 main_~x~0) (< main_~x~0 66)) (and (<= 97 main_~y~0) (< main_~x~0 98) (<= 97 main_~x~0) (<= main_~y~0 97)) (and (<= main_~y~0 61) (<= 61 main_~x~0) (<= 61 main_~y~0) (< main_~x~0 62)) (and (<= main_~y~0 85) (<= 85 main_~x~0) (<= 85 main_~y~0) (< main_~x~0 86)) (and (<= 86 main_~y~0) (< main_~x~0 87) (<= 86 main_~x~0) (<= main_~y~0 86)) (and (<= 51 main_~y~0) (<= 51 main_~x~0) (< main_~x~0 52) (<= main_~y~0 51)) (and (<= main_~y~0 53) (<= 53 main_~x~0) (<= 53 main_~y~0) (< main_~x~0 54)) (and (<= main_~y~0 72) (< main_~x~0 73) (<= 72 main_~x~0) (<= 72 main_~y~0)) (and (<= 91 main_~y~0) (<= main_~y~0 91) (<= 91 main_~x~0) (< main_~x~0 92)) (and (<= 62 main_~x~0) (< main_~x~0 63) (<= main_~y~0 62) (<= 62 main_~y~0)) (and (<= main_~y~0 52) (<= 52 main_~x~0) (<= 52 main_~y~0) (< main_~x~0 53)) (and (<= main_~y~0 71) (<= 71 main_~y~0) (< main_~x~0 72) (<= 71 main_~x~0)) (and (< main_~x~0 55) (<= 54 main_~y~0) (<= 54 main_~x~0) (<= main_~y~0 54)) (and (<= 79 main_~x~0) (< main_~x~0 80) (<= main_~y~0 79) (<= 79 main_~y~0)) (and (< main_~x~0 100) (<= 99 main_~x~0) (<= main_~y~0 99) (<= 99 main_~y~0)) (and (<= main_~y~0 73) (<= 73 main_~x~0) (< main_~x~0 74) (<= 73 main_~y~0)) (and (<= 82 main_~x~0) (<= 82 main_~y~0) (<= main_~y~0 82) (< main_~x~0 83)) (and (<= main_~y~0 94) (<= 94 main_~x~0) (<= 94 main_~y~0) (< main_~x~0 95)) (and (< main_~x~0 99) (<= 98 main_~y~0) (<= 98 main_~x~0) (<= main_~y~0 98)) (and (<= 83 main_~x~0) (< main_~x~0 84) (<= 83 main_~y~0) (<= main_~y~0 83)) (and (<= main_~y~0 59) (<= 59 main_~x~0) (<= 59 main_~y~0) (< main_~x~0 60)) (and (< main_~x~0 88) (<= main_~y~0 87) (<= 87 main_~x~0) (<= 87 main_~y~0)) (and (<= main_~y~0 67) (<= 67 main_~x~0) (<= 67 main_~y~0) (< main_~x~0 68)) (and (< main_~x~0 56) (<= 55 main_~y~0) (<= main_~y~0 55) (<= 55 main_~x~0)) (and (<= 95 main_~x~0) (< main_~x~0 96) (<= 95 main_~y~0) (<= main_~y~0 95)) (and (<= 58 main_~x~0) (<= 58 main_~y~0) (<= main_~y~0 58) (< main_~x~0 59)) (and (<= 64 main_~y~0) (<= main_~y~0 64) (< main_~x~0 65) (<= 64 main_~x~0)) (and (<= main_~y~0 89) (<= 89 main_~y~0) (<= 89 main_~x~0) (< main_~x~0 90)))) [2022-01-31 21:01:36,257 INFO L854 garLoopResultBuilder]: At program point L28-2(lines 27 34) the Hoare annotation is: (let ((.cse0 (<= 50 main_~y~0)) (.cse1 (<= main_~y~0 50))) (or (and (<= main_~y~0 69) (<= 69 main_~y~0) (< main_~x~0 70) (<= 69 main_~x~0)) (and (= main_~x~0 0) .cse0 .cse1) (and (< main_~x~0 76) (<= 75 main_~y~0) (<= 75 main_~x~0) (<= main_~y~0 75)) (and (<= 80 main_~x~0) (<= main_~y~0 80) (< main_~x~0 81) (<= 80 main_~y~0)) (and (< main_~x~0 89) (<= main_~y~0 88) (<= 88 main_~y~0) (<= 88 main_~x~0)) (and (< main_~x~0 85) (<= 84 main_~x~0) (<= main_~y~0 84) (<= 84 main_~y~0)) (and (<= 77 main_~y~0) (< main_~x~0 78) (<= main_~y~0 77) (<= 77 main_~x~0)) (and (<= 63 main_~x~0) (<= 63 main_~y~0) (< main_~x~0 64) (<= main_~y~0 63)) (and (<= 66 main_~y~0) (<= main_~y~0 66) (<= 66 main_~x~0) (< main_~x~0 67)) (and (< main_~x~0 97) (<= 96 main_~y~0) (<= 96 main_~x~0) (<= main_~y~0 96)) (and (<= 74 main_~x~0) (<= 74 main_~y~0) (<= main_~y~0 74) (< main_~x~0 75)) (and (< main_~x~0 77) (<= 76 main_~x~0) (<= main_~y~0 76) (<= 76 main_~y~0)) (and (< main_~x~0 94) (<= 93 main_~y~0) (<= main_~y~0 93) (<= 93 main_~x~0)) (and (<= main_~y~0 57) (<= 57 main_~x~0) (<= 57 main_~y~0) (< main_~x~0 58)) (and (<= 78 main_~y~0) (<= 78 main_~x~0) (< main_~x~0 79) (<= main_~y~0 78)) (and (<= 92 main_~y~0) (<= 92 main_~x~0) (<= main_~y~0 92) (< main_~x~0 93)) (and (< main_~x~0 57) (<= main_~y~0 56) (<= 56 main_~x~0) (<= 56 main_~y~0)) (and .cse0 (or (= main_~x~0 1) (< 1 main_~x~0)) (< main_~x~0 51) .cse1) (and (< main_~x~0 61) (<= 60 main_~y~0) (<= main_~y~0 60) (<= 60 main_~x~0)) (and (<= 90 main_~y~0) (<= main_~y~0 90) (<= 90 main_~x~0) (< main_~x~0 91)) (and (<= 70 main_~x~0) (<= 70 main_~y~0) (<= main_~y~0 70) (< main_~x~0 71)) (and (<= main_~y~0 68) (<= 68 main_~y~0) (<= 68 main_~x~0) (< main_~x~0 69)) (and (<= 81 main_~x~0) (<= main_~y~0 81) (< main_~x~0 82) (<= 81 main_~y~0)) (and (<= 65 main_~y~0) (<= main_~y~0 65) (<= 65 main_~x~0) (< main_~x~0 66)) (and (<= 97 main_~y~0) (< main_~x~0 98) (<= 97 main_~x~0) (<= main_~y~0 97)) (and (<= main_~y~0 61) (<= 61 main_~x~0) (<= 61 main_~y~0) (< main_~x~0 62)) (and (<= main_~y~0 85) (<= 85 main_~x~0) (<= 85 main_~y~0) (< main_~x~0 86)) (and (<= 86 main_~y~0) (< main_~x~0 87) (<= 86 main_~x~0) (<= main_~y~0 86)) (and (<= 51 main_~y~0) (<= 51 main_~x~0) (< main_~x~0 52) (<= main_~y~0 51)) (and (<= main_~y~0 53) (<= 53 main_~x~0) (<= 53 main_~y~0) (< main_~x~0 54)) (and (<= main_~y~0 72) (< main_~x~0 73) (<= 72 main_~x~0) (<= 72 main_~y~0)) (and (<= 91 main_~y~0) (<= main_~y~0 91) (<= 91 main_~x~0) (< main_~x~0 92)) (and (<= 62 main_~x~0) (< main_~x~0 63) (<= main_~y~0 62) (<= 62 main_~y~0)) (and (<= main_~y~0 52) (<= 52 main_~x~0) (<= 52 main_~y~0) (< main_~x~0 53)) (and (<= main_~y~0 71) (<= 71 main_~y~0) (< main_~x~0 72) (<= 71 main_~x~0)) (and (<= 100 main_~x~0) (<= 100 main_~y~0) (< main_~x~0 101) (<= main_~y~0 100)) (and (< main_~x~0 55) (<= 54 main_~y~0) (<= 54 main_~x~0) (<= main_~y~0 54)) (and (<= 79 main_~x~0) (< main_~x~0 80) (<= main_~y~0 79) (<= 79 main_~y~0)) (and (< main_~x~0 100) (<= 99 main_~x~0) (<= main_~y~0 99) (<= 99 main_~y~0)) (and (<= main_~y~0 73) (<= 73 main_~x~0) (< main_~x~0 74) (<= 73 main_~y~0)) (and (<= 82 main_~x~0) (<= 82 main_~y~0) (<= main_~y~0 82) (< main_~x~0 83)) (and (<= main_~y~0 94) (<= 94 main_~x~0) (<= 94 main_~y~0) (< main_~x~0 95)) (and (< main_~x~0 99) (<= 98 main_~y~0) (<= 98 main_~x~0) (<= main_~y~0 98)) (and (<= 83 main_~x~0) (< main_~x~0 84) (<= 83 main_~y~0) (<= main_~y~0 83)) (and (<= main_~y~0 59) (<= 59 main_~x~0) (<= 59 main_~y~0) (< main_~x~0 60)) (and (< main_~x~0 88) (<= main_~y~0 87) (<= 87 main_~x~0) (<= 87 main_~y~0)) (and (<= main_~y~0 67) (<= 67 main_~x~0) (<= 67 main_~y~0) (< main_~x~0 68)) (and (< main_~x~0 56) (<= 55 main_~y~0) (<= main_~y~0 55) (<= 55 main_~x~0)) (and (<= 95 main_~x~0) (< main_~x~0 96) (<= 95 main_~y~0) (<= main_~y~0 95)) (and (<= 58 main_~x~0) (<= 58 main_~y~0) (<= main_~y~0 58) (< main_~x~0 59)) (and (<= 64 main_~y~0) (<= main_~y~0 64) (< main_~x~0 65) (<= 64 main_~x~0)) (and (<= main_~y~0 89) (<= 89 main_~y~0) (<= 89 main_~x~0) (< main_~x~0 90)))) [2022-01-31 21:01:36,257 INFO L854 garLoopResultBuilder]: At program point L27-2(lines 27 34) the Hoare annotation is: (and (< 99 main_~y~0) (<= main_~y~0 100)) [2022-01-31 21:01:36,257 INFO L861 garLoopResultBuilder]: At program point mainEXIT(lines 24 37) the Hoare annotation is: true [2022-01-31 21:01:36,257 INFO L861 garLoopResultBuilder]: At program point mainFINAL(lines 24 37) the Hoare annotation is: true [2022-01-31 21:01:36,257 INFO L861 garLoopResultBuilder]: At program point L35(line 35) the Hoare annotation is: true [2022-01-31 21:01:36,257 INFO L861 garLoopResultBuilder]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2022-01-31 21:01:36,257 INFO L854 garLoopResultBuilder]: At program point ULTIMATE.initENTRY(line -1) the Hoare annotation is: (and (= |#NULL.offset| |old(#NULL.offset)|) (= |old(#NULL.base)| |#NULL.base|)) [2022-01-31 21:01:36,257 INFO L861 garLoopResultBuilder]: At program point ULTIMATE.initEXIT(line -1) the Hoare annotation is: true [2022-01-31 21:01:36,257 INFO L861 garLoopResultBuilder]: At program point ULTIMATE.startEXIT(line -1) the Hoare annotation is: true [2022-01-31 21:01:36,257 INFO L861 garLoopResultBuilder]: At program point L-1(line -1) the Hoare annotation is: true [2022-01-31 21:01:36,258 INFO L861 garLoopResultBuilder]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2022-01-31 21:01:36,258 INFO L861 garLoopResultBuilder]: At program point ULTIMATE.startFINAL(line -1) the Hoare annotation is: true [2022-01-31 21:01:36,258 INFO L861 garLoopResultBuilder]: At program point L18-2(lines 17 22) the Hoare annotation is: true [2022-01-31 21:01:36,258 INFO L861 garLoopResultBuilder]: At program point __VERIFIER_assertENTRY(lines 17 22) the Hoare annotation is: true [2022-01-31 21:01:36,258 INFO L861 garLoopResultBuilder]: At program point __VERIFIER_assertEXIT(lines 17 22) the Hoare annotation is: true [2022-01-31 21:01:36,258 INFO L854 garLoopResultBuilder]: At program point L19(line 19) the Hoare annotation is: (= |__VERIFIER_assert_#in~cond| 0) [2022-01-31 21:01:36,258 INFO L854 garLoopResultBuilder]: At program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 19) the Hoare annotation is: (= |__VERIFIER_assert_#in~cond| 0) [2022-01-31 21:01:36,258 INFO L854 garLoopResultBuilder]: At program point L18(lines 18 20) the Hoare annotation is: (or (= |__VERIFIER_assert_#in~cond| 0) (not (= __VERIFIER_assert_~cond 0))) [2022-01-31 21:01:36,260 INFO L732 BasicCegarLoop]: Path program histogram: [50, 1, 1, 1] [2022-01-31 21:01:36,261 INFO L180 ceAbstractionStarter]: Computing trace abstraction results [2022-01-31 21:01:36,298 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 31.01 09:01:36 BoogieIcfgContainer [2022-01-31 21:01:36,298 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2022-01-31 21:01:36,299 INFO L158 Benchmark]: Toolchain (without parser) took 95786.70ms. Allocated memory was 176.2MB in the beginning and 336.6MB in the end (delta: 160.4MB). Free memory was 120.0MB in the beginning and 209.4MB in the end (delta: -89.4MB). Peak memory consumption was 175.9MB. Max. memory is 8.0GB. [2022-01-31 21:01:36,299 INFO L158 Benchmark]: CDTParser took 0.10ms. Allocated memory is still 176.2MB. Free memory is still 136.1MB. There was no memory consumed. Max. memory is 8.0GB. [2022-01-31 21:01:36,299 INFO L158 Benchmark]: CACSL2BoogieTranslator took 213.39ms. Allocated memory was 176.2MB in the beginning and 232.8MB in the end (delta: 56.6MB). Free memory was 119.9MB in the beginning and 205.6MB in the end (delta: -85.7MB). Peak memory consumption was 11.2MB. Max. memory is 8.0GB. [2022-01-31 21:01:36,299 INFO L158 Benchmark]: Boogie Preprocessor took 29.69ms. Allocated memory is still 232.8MB. Free memory was 205.6MB in the beginning and 204.0MB in the end (delta: 1.6MB). Peak memory consumption was 2.1MB. Max. memory is 8.0GB. [2022-01-31 21:01:36,299 INFO L158 Benchmark]: RCFGBuilder took 290.84ms. Allocated memory is still 232.8MB. Free memory was 204.0MB in the beginning and 193.0MB in the end (delta: 11.0MB). Peak memory consumption was 10.5MB. Max. memory is 8.0GB. [2022-01-31 21:01:36,299 INFO L158 Benchmark]: TraceAbstraction took 95249.19ms. Allocated memory was 232.8MB in the beginning and 336.6MB in the end (delta: 103.8MB). Free memory was 192.5MB in the beginning and 209.4MB in the end (delta: -16.9MB). Peak memory consumption was 192.0MB. Max. memory is 8.0GB. [2022-01-31 21:01:36,300 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.10ms. Allocated memory is still 176.2MB. Free memory is still 136.1MB. There was no memory consumed. Max. memory is 8.0GB. * CACSL2BoogieTranslator took 213.39ms. Allocated memory was 176.2MB in the beginning and 232.8MB in the end (delta: 56.6MB). Free memory was 119.9MB in the beginning and 205.6MB in the end (delta: -85.7MB). Peak memory consumption was 11.2MB. Max. memory is 8.0GB. * Boogie Preprocessor took 29.69ms. Allocated memory is still 232.8MB. Free memory was 205.6MB in the beginning and 204.0MB in the end (delta: 1.6MB). Peak memory consumption was 2.1MB. Max. memory is 8.0GB. * RCFGBuilder took 290.84ms. Allocated memory is still 232.8MB. Free memory was 204.0MB in the beginning and 193.0MB in the end (delta: 11.0MB). Peak memory consumption was 10.5MB. Max. memory is 8.0GB. * TraceAbstraction took 95249.19ms. Allocated memory was 232.8MB in the beginning and 336.6MB in the end (delta: 103.8MB). Free memory was 192.5MB in the beginning and 209.4MB in the end (delta: -16.9MB). Peak memory consumption was 192.0MB. Max. memory is 8.0GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - PositiveResult [Line: 19]: call to reach_error is unreachable For all program executions holds that call to reach_error is unreachable at this location - StatisticsResult: Ultimate Automizer benchmark data CFG has 6 procedures, 27 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 95.1s, OverallIterations: 53, TraceHistogramMax: 52, PathProgramHistogramMax: 50, EmptinessCheckTime: 0.0s, AutomataDifference: 55.2s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.9s, InitialAbstractionConstructionTime: 0.0s, PartialOrderReductionTime: 0.0s, HoareTripleCheckerStatistics: 0 mSolverCounterUnknown, 1807 SdHoareTripleChecker+Valid, 30.0s IncrementalHoareTripleChecker+Time, 0 mSdLazyCounter, 1806 mSDsluCounter, 8216 SdHoareTripleChecker+Invalid, 25.4s Time, 0 mProtectedAction, 0 SdHoareTripleChecker+Unchecked, 0 IncrementalHoareTripleChecker+Unchecked, 7627 mSDsCounter, 1636 IncrementalHoareTripleChecker+Valid, 0 mProtectedPredicate, 113842 IncrementalHoareTripleChecker+Invalid, 115478 SdHoareTripleChecker+Unknown, 0 mSolverCounterNotChecked, 1636 mSolverCounterUnsat, 589 mSDtfsCounter, 113842 mSolverCounterSat, 0.1s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Unknown, PredicateUnifierStatistics: 0 DeclaredPredicates, 4655 GetRequests, 1490 SyntacticMatches, 51 SemanticMatches, 3114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33565 ImplicationChecksByTransitivity, 49.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=117occurred in iteration=52, InterpolantAutomatonStates: 1540, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.3s AutomataMinimizationTime, 53 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 20 LocationsWithAnnotation, 338 PreInvPairs, 553 NumberOfFragments, 1384 HoareAnnotationTreeSize, 338 FomulaSimplifications, 29 FormulaSimplificationTreeSizeReduction, 0.1s HoareSimplificationTime, 20 FomulaSimplificationsInter, 5 FormulaSimplificationTreeSizeReductionInter, 0.7s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: No data available, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 27]: Loop Invariant Derived loop invariant: (((((((((((((((((((((((((((((((((((((((((((((((((((((y <= 69 && 69 <= y) && x < 70) && 69 <= x) || ((x == 0 && 50 <= y) && y <= 50)) || (((x < 76 && 75 <= y) && 75 <= x) && y <= 75)) || (((80 <= x && y <= 80) && x < 81) && 80 <= y)) || (((x < 89 && y <= 88) && 88 <= y) && 88 <= x)) || (((x < 85 && 84 <= x) && y <= 84) && 84 <= y)) || (((77 <= y && x < 78) && y <= 77) && 77 <= x)) || (((63 <= x && 63 <= y) && x < 64) && y <= 63)) || (((66 <= y && y <= 66) && 66 <= x) && x < 67)) || (((x < 97 && 96 <= y) && 96 <= x) && y <= 96)) || (((74 <= x && 74 <= y) && y <= 74) && x < 75)) || (((x < 77 && 76 <= x) && y <= 76) && 76 <= y)) || (((x < 94 && 93 <= y) && y <= 93) && 93 <= x)) || (((y <= 57 && 57 <= x) && 57 <= y) && x < 58)) || (((78 <= y && 78 <= x) && x < 79) && y <= 78)) || (((92 <= y && 92 <= x) && y <= 92) && x < 93)) || (((x < 57 && y <= 56) && 56 <= x) && 56 <= y)) || (((50 <= y && (x == 1 || 1 < x)) && x < 51) && y <= 50)) || (((x < 61 && 60 <= y) && y <= 60) && 60 <= x)) || (((90 <= y && y <= 90) && 90 <= x) && x < 91)) || (((70 <= x && 70 <= y) && y <= 70) && x < 71)) || (((y <= 68 && 68 <= y) && 68 <= x) && x < 69)) || (((81 <= x && y <= 81) && x < 82) && 81 <= y)) || (((65 <= y && y <= 65) && 65 <= x) && x < 66)) || (((97 <= y && x < 98) && 97 <= x) && y <= 97)) || (((y <= 61 && 61 <= x) && 61 <= y) && x < 62)) || (((y <= 85 && 85 <= x) && 85 <= y) && x < 86)) || (((86 <= y && x < 87) && 86 <= x) && y <= 86)) || (((51 <= y && 51 <= x) && x < 52) && y <= 51)) || (((y <= 53 && 53 <= x) && 53 <= y) && x < 54)) || (((y <= 72 && x < 73) && 72 <= x) && 72 <= y)) || (((91 <= y && y <= 91) && 91 <= x) && x < 92)) || (((62 <= x && x < 63) && y <= 62) && 62 <= y)) || (((y <= 52 && 52 <= x) && 52 <= y) && x < 53)) || (((y <= 71 && 71 <= y) && x < 72) && 71 <= x)) || (((100 <= x && 100 <= y) && x < 101) && y <= 100)) || (((x < 55 && 54 <= y) && 54 <= x) && y <= 54)) || (((79 <= x && x < 80) && y <= 79) && 79 <= y)) || (((x < 100 && 99 <= x) && y <= 99) && 99 <= y)) || (((y <= 73 && 73 <= x) && x < 74) && 73 <= y)) || (((82 <= x && 82 <= y) && y <= 82) && x < 83)) || (((y <= 94 && 94 <= x) && 94 <= y) && x < 95)) || (((x < 99 && 98 <= y) && 98 <= x) && y <= 98)) || (((83 <= x && x < 84) && 83 <= y) && y <= 83)) || (((y <= 59 && 59 <= x) && 59 <= y) && x < 60)) || (((x < 88 && y <= 87) && 87 <= x) && 87 <= y)) || (((y <= 67 && 67 <= x) && 67 <= y) && x < 68)) || (((x < 56 && 55 <= y) && y <= 55) && 55 <= x)) || (((95 <= x && x < 96) && 95 <= y) && y <= 95)) || (((58 <= x && 58 <= y) && y <= 58) && x < 59)) || (((64 <= y && y <= 64) && x < 65) && 64 <= x)) || (((y <= 89 && 89 <= y) && 89 <= x) && x < 90) - ProcedureContractResult [Line: 24]: Procedure Contract for main Derived contract for procedure main: 1 - ProcedureContractResult [Line: 17]: Procedure Contract for __VERIFIER_assert Derived contract for procedure __VERIFIER_assert: 1 RESULT: Ultimate proved your program to be correct! [2022-01-31 21:01:36,334 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request...