/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationQvasr_64.epf -i ../../../trunk/examples/svcomp/loops/sum01-1.i -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-05ce600 [2022-02-24 02:45:37,348 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-02-24 02:45:37,381 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-02-24 02:45:37,401 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-02-24 02:45:37,443 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-02-24 02:45:37,444 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-02-24 02:45:37,445 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-02-24 02:45:37,445 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationQvasr_64.epf [2022-02-24 02:45:37,461 INFO L113 SettingsManager]: Loading preferences was successful [2022-02-24 02:45:37,461 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-02-24 02:45:37,462 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-02-24 02:45:37,462 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-02-24 02:45:37,462 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-02-24 02:45:37,462 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-02-24 02:45:37,462 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-02-24 02:45:37,462 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-02-24 02:45:37,463 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-02-24 02:45:37,463 INFO L138 SettingsManager]: * Use constant arrays=true [2022-02-24 02:45:37,463 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-02-24 02:45:37,463 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-02-24 02:45:37,463 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-02-24 02:45:37,463 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-02-24 02:45:37,463 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-02-24 02:45:37,463 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-02-24 02:45:37,463 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-02-24 02:45:37,463 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2022-02-24 02:45:37,463 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-02-24 02:45:37,464 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=QVASR [2022-02-24 02:45:37,464 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-02-24 02:45:37,651 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-02-24 02:45:37,666 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-02-24 02:45:37,668 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-02-24 02:45:37,669 INFO L271 PluginConnector]: Initializing CDTParser... [2022-02-24 02:45:37,670 INFO L275 PluginConnector]: CDTParser initialized [2022-02-24 02:45:37,671 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/sum01-1.i [2022-02-24 02:45:37,721 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/92670ebaa/5b9a9c796b67491fa66d4da705875b87/FLAG91a9a3453 [2022-02-24 02:45:38,063 INFO L306 CDTParser]: Found 1 translation units. [2022-02-24 02:45:38,063 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/sum01-1.i [2022-02-24 02:45:38,072 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/92670ebaa/5b9a9c796b67491fa66d4da705875b87/FLAG91a9a3453 [2022-02-24 02:45:38,083 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/92670ebaa/5b9a9c796b67491fa66d4da705875b87 [2022-02-24 02:45:38,085 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-02-24 02:45:38,086 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-02-24 02:45:38,088 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-02-24 02:45:38,088 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-02-24 02:45:38,091 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-02-24 02:45:38,091 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.02 02:45:38" (1/1) ... [2022-02-24 02:45:38,092 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@b2081ff and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.02 02:45:38, skipping insertion in model container [2022-02-24 02:45:38,092 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.02 02:45:38" (1/1) ... [2022-02-24 02:45:38,097 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-02-24 02:45:38,106 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-02-24 02:45:38,221 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops/sum01-1.i[808,821] [2022-02-24 02:45:38,229 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-02-24 02:45:38,233 INFO L203 MainTranslator]: Completed pre-run [2022-02-24 02:45:38,241 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops/sum01-1.i[808,821] [2022-02-24 02:45:38,243 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-02-24 02:45:38,251 INFO L208 MainTranslator]: Completed translation [2022-02-24 02:45:38,252 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.02 02:45:38 WrapperNode [2022-02-24 02:45:38,252 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-02-24 02:45:38,252 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-02-24 02:45:38,253 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-02-24 02:45:38,253 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-02-24 02:45:38,260 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.02 02:45:38" (1/1) ... [2022-02-24 02:45:38,260 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.02 02:45:38" (1/1) ... [2022-02-24 02:45:38,264 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.02 02:45:38" (1/1) ... [2022-02-24 02:45:38,264 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.02 02:45:38" (1/1) ... [2022-02-24 02:45:38,267 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.02 02:45:38" (1/1) ... [2022-02-24 02:45:38,269 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.02 02:45:38" (1/1) ... [2022-02-24 02:45:38,270 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.02 02:45:38" (1/1) ... [2022-02-24 02:45:38,271 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-02-24 02:45:38,272 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-02-24 02:45:38,272 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-02-24 02:45:38,272 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-02-24 02:45:38,273 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.02 02:45:38" (1/1) ... [2022-02-24 02:45:38,278 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-02-24 02:45:38,284 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-02-24 02:45:38,294 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) [2022-02-24 02:45:38,296 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 [2022-02-24 02:45:38,318 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-02-24 02:45:38,318 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-02-24 02:45:38,318 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-02-24 02:45:38,318 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-02-24 02:45:38,319 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-02-24 02:45:38,319 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-02-24 02:45:38,319 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-02-24 02:45:38,319 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2022-02-24 02:45:38,319 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2022-02-24 02:45:38,319 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-02-24 02:45:38,319 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-02-24 02:45:38,319 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-02-24 02:45:38,319 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2022-02-24 02:45:38,319 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-02-24 02:45:38,319 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-02-24 02:45:38,319 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-02-24 02:45:38,319 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-02-24 02:45:38,319 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-02-24 02:45:38,320 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-02-24 02:45:38,320 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-02-24 02:45:38,363 INFO L234 CfgBuilder]: Building ICFG [2022-02-24 02:45:38,364 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-02-24 02:45:38,486 INFO L275 CfgBuilder]: Performing block encoding [2022-02-24 02:45:38,489 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-02-24 02:45:38,490 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2022-02-24 02:45:38,491 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.02 02:45:38 BoogieIcfgContainer [2022-02-24 02:45:38,491 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-02-24 02:45:38,492 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-02-24 02:45:38,492 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-02-24 02:45:38,500 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-02-24 02:45:38,500 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.02 02:45:38" (1/3) ... [2022-02-24 02:45:38,500 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@f0fa27c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.02 02:45:38, skipping insertion in model container [2022-02-24 02:45:38,501 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.02 02:45:38" (2/3) ... [2022-02-24 02:45:38,501 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@f0fa27c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.02 02:45:38, skipping insertion in model container [2022-02-24 02:45:38,501 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.02 02:45:38" (3/3) ... [2022-02-24 02:45:38,502 INFO L111 eAbstractionObserver]: Analyzing ICFG sum01-1.i [2022-02-24 02:45:38,505 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-02-24 02:45:38,506 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-02-24 02:45:38,547 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-02-24 02:45:38,557 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=QVASR [2022-02-24 02:45:38,558 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-02-24 02:45:38,570 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) [2022-02-24 02:45:38,586 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-02-24 02:45:38,586 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 02:45:38,587 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 02:45:38,587 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 02:45:38,591 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 02:45:38,592 INFO L85 PathProgramCache]: Analyzing trace with hash 1466806487, now seen corresponding path program 1 times [2022-02-24 02:45:38,597 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 02:45:38,597 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [23493382] [2022-02-24 02:45:38,598 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 02:45:38,607 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 02:45:38,646 INFO L213 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-02-24 02:45:38,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:45:38,777 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 02:45:38,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:45:38,784 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 02:45:38,785 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 02:45:38,786 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [23493382] [2022-02-24 02:45:38,787 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [23493382] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 02:45:38,787 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 02:45:38,787 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-02-24 02:45:38,788 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [116451594] [2022-02-24 02:45:38,788 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 02:45:38,790 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-02-24 02:45:38,791 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 02:45:38,815 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-02-24 02:45:38,816 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-02-24 02:45:38,820 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) [2022-02-24 02:45:38,846 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 02:45:38,846 INFO L93 Difference]: Finished difference Result 31 states and 35 transitions. [2022-02-24 02:45:38,854 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-02-24 02:45:38,855 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 [2022-02-24 02:45:38,856 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 02:45:38,859 INFO L225 Difference]: With dead ends: 31 [2022-02-24 02:45:38,859 INFO L226 Difference]: Without dead ends: 14 [2022-02-24 02:45:38,861 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 [2022-02-24 02:45:38,863 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 [2022-02-24 02:45:38,864 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] [2022-02-24 02:45:38,876 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2022-02-24 02:45:38,893 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2022-02-24 02:45:38,895 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 9 states have internal predecessors, (11), 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) [2022-02-24 02:45:38,896 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2022-02-24 02:45:38,897 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 11 [2022-02-24 02:45:38,897 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 02:45:38,898 INFO L470 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2022-02-24 02:45:38,898 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) [2022-02-24 02:45:38,898 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2022-02-24 02:45:38,898 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-02-24 02:45:38,899 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 02:45:38,899 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 02:45:38,899 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-02-24 02:45:38,900 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 02:45:38,900 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 02:45:38,900 INFO L85 PathProgramCache]: Analyzing trace with hash 1456647756, now seen corresponding path program 1 times [2022-02-24 02:45:38,900 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 02:45:38,900 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [343932154] [2022-02-24 02:45:38,900 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 02:45:38,901 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 02:45:38,904 INFO L213 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-02-24 02:45:38,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:45:38,995 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 02:45:38,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:45:39,001 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 02:45:39,001 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 02:45:39,001 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [343932154] [2022-02-24 02:45:39,002 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [343932154] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 02:45:39,002 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 02:45:39,002 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-02-24 02:45:39,002 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [445992556] [2022-02-24 02:45:39,002 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 02:45:39,003 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-02-24 02:45:39,003 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 02:45:39,003 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-02-24 02:45:39,003 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-02-24 02:45:39,003 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand has 6 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 4 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) [2022-02-24 02:45:39,074 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 02:45:39,074 INFO L93 Difference]: Finished difference Result 22 states and 24 transitions. [2022-02-24 02:45:39,074 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-02-24 02:45:39,075 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 4 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 [2022-02-24 02:45:39,075 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 02:45:39,075 INFO L225 Difference]: With dead ends: 22 [2022-02-24 02:45:39,075 INFO L226 Difference]: Without dead ends: 17 [2022-02-24 02:45:39,076 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2022-02-24 02:45:39,077 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 17 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 40 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-02-24 02:45:39,077 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 29 Invalid, 40 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-02-24 02:45:39,078 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2022-02-24 02:45:39,081 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2022-02-24 02:45:39,081 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) [2022-02-24 02:45:39,081 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2022-02-24 02:45:39,081 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 11 [2022-02-24 02:45:39,081 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 02:45:39,082 INFO L470 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2022-02-24 02:45:39,082 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 4 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) [2022-02-24 02:45:39,082 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2022-02-24 02:45:39,082 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-02-24 02:45:39,082 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 02:45:39,082 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 02:45:39,083 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-02-24 02:45:39,083 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 02:45:39,083 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 02:45:39,083 INFO L85 PathProgramCache]: Analyzing trace with hash 193151625, now seen corresponding path program 1 times [2022-02-24 02:45:39,083 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 02:45:39,083 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [890454571] [2022-02-24 02:45:39,084 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 02:45:39,084 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 02:45:39,291 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 02:45:39,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:45:39,413 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 02:45:39,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:45:39,426 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 02:45:39,489 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 02:45:39,489 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [890454571] [2022-02-24 02:45:39,490 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [890454571] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 02:45:39,491 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 02:45:39,491 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2022-02-24 02:45:39,491 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1694342964] [2022-02-24 02:45:39,491 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 02:45:39,492 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-02-24 02:45:39,492 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 02:45:39,493 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-02-24 02:45:39,494 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2022-02-24 02:45:39,494 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand has 10 states, 9 states have (on average 1.1111111111111112) internal successors, (10), 8 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:45:39,601 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 02:45:39,602 INFO L93 Difference]: Finished difference Result 30 states and 36 transitions. [2022-02-24 02:45:39,602 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-02-24 02:45:39,602 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 1.1111111111111112) internal successors, (10), 8 states have internal predecessors, (10), 2 states have call successors, (3), 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 14 [2022-02-24 02:45:39,602 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 02:45:39,603 INFO L225 Difference]: With dead ends: 30 [2022-02-24 02:45:39,603 INFO L226 Difference]: Without dead ends: 19 [2022-02-24 02:45:39,604 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=47, Invalid=163, Unknown=0, NotChecked=0, Total=210 [2022-02-24 02:45:39,609 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 16 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 75 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 83 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 75 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-02-24 02:45:39,610 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 43 Invalid, 83 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 75 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-02-24 02:45:39,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2022-02-24 02:45:39,615 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2022-02-24 02:45:39,615 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 14 states have internal predecessors, (16), 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) [2022-02-24 02:45:39,615 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2022-02-24 02:45:39,615 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 14 [2022-02-24 02:45:39,615 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 02:45:39,616 INFO L470 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2022-02-24 02:45:39,616 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 1.1111111111111112) internal successors, (10), 8 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:45:39,616 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2022-02-24 02:45:39,616 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-02-24 02:45:39,616 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 02:45:39,616 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 02:45:39,616 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-02-24 02:45:39,617 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 02:45:39,617 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 02:45:39,617 INFO L85 PathProgramCache]: Analyzing trace with hash 473295148, now seen corresponding path program 2 times [2022-02-24 02:45:39,617 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 02:45:39,617 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1905388956] [2022-02-24 02:45:39,617 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 02:45:39,618 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 02:45:39,728 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 02:45:39,827 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 02:45:39,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:45:39,911 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 02:45:39,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:45:39,924 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 02:45:40,020 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 02:45:40,021 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1905388956] [2022-02-24 02:45:40,021 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1905388956] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 02:45:40,021 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 02:45:40,021 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2022-02-24 02:45:40,021 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1853230424] [2022-02-24 02:45:40,021 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 02:45:40,022 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-02-24 02:45:40,022 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 02:45:40,023 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-02-24 02:45:40,023 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=129, Unknown=0, NotChecked=0, Total=156 [2022-02-24 02:45:40,024 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand has 13 states, 12 states have (on average 1.0833333333333333) internal successors, (13), 11 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) [2022-02-24 02:45:40,160 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 02:45:40,161 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2022-02-24 02:45:40,161 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-02-24 02:45:40,161 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 1.0833333333333333) internal successors, (13), 11 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 [2022-02-24 02:45:40,161 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 02:45:40,162 INFO L225 Difference]: With dead ends: 30 [2022-02-24 02:45:40,162 INFO L226 Difference]: Without dead ends: 22 [2022-02-24 02:45:40,162 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=61, Invalid=319, Unknown=0, NotChecked=0, Total=380 [2022-02-24 02:45:40,163 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 17 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 135 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 144 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 135 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-02-24 02:45:40,163 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 58 Invalid, 144 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 135 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-02-24 02:45:40,163 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2022-02-24 02:45:40,166 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2022-02-24 02:45:40,166 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 17 states have (on average 1.1176470588235294) internal successors, (19), 17 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) [2022-02-24 02:45:40,166 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 23 transitions. [2022-02-24 02:45:40,167 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 23 transitions. Word has length 17 [2022-02-24 02:45:40,167 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 02:45:40,167 INFO L470 AbstractCegarLoop]: Abstraction has 22 states and 23 transitions. [2022-02-24 02:45:40,167 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 1.0833333333333333) internal successors, (13), 11 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) [2022-02-24 02:45:40,167 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 23 transitions. [2022-02-24 02:45:40,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-02-24 02:45:40,168 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 02:45:40,168 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 02:45:40,168 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-02-24 02:45:40,168 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 02:45:40,168 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 02:45:40,168 INFO L85 PathProgramCache]: Analyzing trace with hash 1107532713, now seen corresponding path program 3 times [2022-02-24 02:45:40,168 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 02:45:40,169 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [21352987] [2022-02-24 02:45:40,169 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 02:45:40,169 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 02:45:40,313 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 02:45:40,415 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 02:45:40,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:45:40,476 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 02:45:40,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:45:40,481 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 02:45:40,602 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 02:45:40,602 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [21352987] [2022-02-24 02:45:40,602 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [21352987] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 02:45:40,602 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 02:45:40,603 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2022-02-24 02:45:40,603 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [184531921] [2022-02-24 02:45:40,603 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 02:45:40,604 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-02-24 02:45:40,604 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 02:45:40,604 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-02-24 02:45:40,604 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=233, Unknown=0, NotChecked=0, Total=272 [2022-02-24 02:45:40,605 INFO L87 Difference]: Start difference. First operand 22 states and 23 transitions. Second operand has 16 states, 15 states have (on average 1.0666666666666667) internal successors, (16), 14 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:45:40,801 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 02:45:40,801 INFO L93 Difference]: Finished difference Result 33 states and 37 transitions. [2022-02-24 02:45:40,802 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-02-24 02:45:40,802 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 1.0666666666666667) internal successors, (16), 14 states have internal predecessors, (16), 2 states have call successors, (3), 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 20 [2022-02-24 02:45:40,802 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 02:45:40,803 INFO L225 Difference]: With dead ends: 33 [2022-02-24 02:45:40,803 INFO L226 Difference]: Without dead ends: 25 [2022-02-24 02:45:40,803 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 2 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 128 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=89, Invalid=613, Unknown=0, NotChecked=0, Total=702 [2022-02-24 02:45:40,804 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 19 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 215 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 226 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 215 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-02-24 02:45:40,804 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 73 Invalid, 226 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 215 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-02-24 02:45:40,805 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2022-02-24 02:45:40,807 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2022-02-24 02:45:40,808 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 20 states have (on average 1.1) internal successors, (22), 20 states have internal predecessors, (22), 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) [2022-02-24 02:45:40,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2022-02-24 02:45:40,808 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 20 [2022-02-24 02:45:40,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 02:45:40,809 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2022-02-24 02:45:40,809 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 15 states have (on average 1.0666666666666667) internal successors, (16), 14 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:45:40,809 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2022-02-24 02:45:40,809 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-02-24 02:45:40,809 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 02:45:40,809 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 02:45:40,809 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-02-24 02:45:40,810 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 02:45:40,810 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 02:45:40,810 INFO L85 PathProgramCache]: Analyzing trace with hash 2117696524, now seen corresponding path program 4 times [2022-02-24 02:45:40,810 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 02:45:40,810 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [365879346] [2022-02-24 02:45:40,810 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 02:45:40,811 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 02:45:40,950 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 02:45:41,087 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 02:45:41,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:45:41,138 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 02:45:41,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:45:41,142 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 02:45:41,304 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 02:45:41,304 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [365879346] [2022-02-24 02:45:41,304 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [365879346] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 02:45:41,304 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 02:45:41,304 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2022-02-24 02:45:41,304 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [173157335] [2022-02-24 02:45:41,304 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 02:45:41,305 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-02-24 02:45:41,305 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 02:45:41,305 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-02-24 02:45:41,305 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=334, Unknown=0, NotChecked=0, Total=380 [2022-02-24 02:45:41,306 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand has 19 states, 18 states have (on average 1.0555555555555556) internal successors, (19), 17 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) [2022-02-24 02:45:41,550 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 02:45:41,550 INFO L93 Difference]: Finished difference Result 36 states and 40 transitions. [2022-02-24 02:45:41,550 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-02-24 02:45:41,550 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 1.0555555555555556) internal successors, (19), 17 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 [2022-02-24 02:45:41,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 02:45:41,551 INFO L225 Difference]: With dead ends: 36 [2022-02-24 02:45:41,551 INFO L226 Difference]: Without dead ends: 28 [2022-02-24 02:45:41,552 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 2 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 203 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=110, Invalid=946, Unknown=0, NotChecked=0, Total=1056 [2022-02-24 02:45:41,552 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 22 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 295 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 83 SdHoareTripleChecker+Invalid, 308 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 295 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-02-24 02:45:41,552 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 83 Invalid, 308 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 295 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-02-24 02:45:41,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2022-02-24 02:45:41,556 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2022-02-24 02:45:41,556 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 23 states have (on average 1.0869565217391304) internal successors, (25), 23 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) [2022-02-24 02:45:41,556 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 29 transitions. [2022-02-24 02:45:41,556 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 29 transitions. Word has length 23 [2022-02-24 02:45:41,557 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 02:45:41,557 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 29 transitions. [2022-02-24 02:45:41,557 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 18 states have (on average 1.0555555555555556) internal successors, (19), 17 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) [2022-02-24 02:45:41,557 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 29 transitions. [2022-02-24 02:45:41,557 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-02-24 02:45:41,557 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 02:45:41,557 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 02:45:41,558 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2022-02-24 02:45:41,558 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 02:45:41,558 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 02:45:41,558 INFO L85 PathProgramCache]: Analyzing trace with hash 1071946953, now seen corresponding path program 5 times [2022-02-24 02:45:41,558 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 02:45:41,558 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1925720432] [2022-02-24 02:45:41,558 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 02:45:41,559 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 02:45:41,684 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 02:45:41,777 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 02:45:41,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:45:41,844 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 02:45:41,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:45:41,851 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 02:45:42,079 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 02:45:42,079 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1925720432] [2022-02-24 02:45:42,079 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1925720432] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 02:45:42,079 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 02:45:42,079 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2022-02-24 02:45:42,079 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [683736775] [2022-02-24 02:45:42,080 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 02:45:42,080 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-02-24 02:45:42,080 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 02:45:42,080 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-02-24 02:45:42,080 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=439, Unknown=0, NotChecked=0, Total=506 [2022-02-24 02:45:42,080 INFO L87 Difference]: Start difference. First operand 28 states and 29 transitions. Second operand has 22 states, 21 states have (on average 1.0476190476190477) internal successors, (22), 20 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:45:42,425 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 02:45:42,426 INFO L93 Difference]: Finished difference Result 42 states and 46 transitions. [2022-02-24 02:45:42,426 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-02-24 02:45:42,426 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 1.0476190476190477) internal successors, (22), 20 states have internal predecessors, (22), 2 states have call successors, (3), 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 26 [2022-02-24 02:45:42,426 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 02:45:42,426 INFO L225 Difference]: With dead ends: 42 [2022-02-24 02:45:42,427 INFO L226 Difference]: Without dead ends: 31 [2022-02-24 02:45:42,427 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 1 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 354 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=176, Invalid=1546, Unknown=0, NotChecked=0, Total=1722 [2022-02-24 02:45:42,428 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 25 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 386 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 92 SdHoareTripleChecker+Invalid, 402 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 386 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-02-24 02:45:42,428 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 92 Invalid, 402 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 386 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-02-24 02:45:42,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2022-02-24 02:45:42,431 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2022-02-24 02:45:42,431 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 26 states have (on average 1.0769230769230769) internal successors, (28), 26 states have internal predecessors, (28), 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) [2022-02-24 02:45:42,432 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2022-02-24 02:45:42,432 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 26 [2022-02-24 02:45:42,432 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 02:45:42,432 INFO L470 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2022-02-24 02:45:42,432 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 21 states have (on average 1.0476190476190477) internal successors, (22), 20 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:45:42,432 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2022-02-24 02:45:42,433 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-02-24 02:45:42,433 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 02:45:42,433 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 02:45:42,433 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2022-02-24 02:45:42,433 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 02:45:42,433 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 02:45:42,433 INFO L85 PathProgramCache]: Analyzing trace with hash -1455724820, now seen corresponding path program 6 times [2022-02-24 02:45:42,433 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 02:45:42,434 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [471759940] [2022-02-24 02:45:42,434 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 02:45:42,434 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 02:45:42,561 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 02:45:42,696 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 02:45:42,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:45:42,731 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 02:45:42,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:45:42,736 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 02:45:43,002 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 02:45:43,003 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [471759940] [2022-02-24 02:45:43,003 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [471759940] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 02:45:43,003 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 02:45:43,003 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2022-02-24 02:45:43,003 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1212820245] [2022-02-24 02:45:43,003 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 02:45:43,003 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-02-24 02:45:43,003 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 02:45:43,004 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-02-24 02:45:43,004 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=545, Unknown=0, NotChecked=0, Total=600 [2022-02-24 02:45:43,004 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand has 25 states, 24 states have (on average 1.0416666666666667) internal successors, (25), 23 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) [2022-02-24 02:45:43,435 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 02:45:43,435 INFO L93 Difference]: Finished difference Result 42 states and 46 transitions. [2022-02-24 02:45:43,437 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-02-24 02:45:43,437 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 1.0416666666666667) internal successors, (25), 23 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 [2022-02-24 02:45:43,437 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 02:45:43,437 INFO L225 Difference]: With dead ends: 42 [2022-02-24 02:45:43,437 INFO L226 Difference]: Without dead ends: 34 [2022-02-24 02:45:43,438 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 4 SyntacticMatches, 2 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 347 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=145, Invalid=1747, Unknown=0, NotChecked=0, Total=1892 [2022-02-24 02:45:43,439 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 25 mSDsluCounter, 102 mSDsCounter, 0 mSdLazyCounter, 538 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 113 SdHoareTripleChecker+Invalid, 555 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 538 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-02-24 02:45:43,439 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 113 Invalid, 555 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 538 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-02-24 02:45:43,439 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2022-02-24 02:45:43,442 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2022-02-24 02:45:43,442 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 29 states have (on average 1.0689655172413792) internal successors, (31), 29 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) [2022-02-24 02:45:43,442 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 35 transitions. [2022-02-24 02:45:43,443 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 35 transitions. Word has length 29 [2022-02-24 02:45:43,443 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 02:45:43,443 INFO L470 AbstractCegarLoop]: Abstraction has 34 states and 35 transitions. [2022-02-24 02:45:43,443 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 24 states have (on average 1.0416666666666667) internal successors, (25), 23 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) [2022-02-24 02:45:43,443 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 35 transitions. [2022-02-24 02:45:43,443 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-02-24 02:45:43,443 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 02:45:43,443 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 02:45:43,444 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2022-02-24 02:45:43,444 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 02:45:43,444 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 02:45:43,444 INFO L85 PathProgramCache]: Analyzing trace with hash 336086505, now seen corresponding path program 7 times [2022-02-24 02:45:43,444 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 02:45:43,444 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [78713875] [2022-02-24 02:45:43,444 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 02:45:43,445 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 02:45:43,565 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 02:45:43,681 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 02:45:43,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:45:43,729 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 02:45:43,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:45:43,734 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 02:45:44,095 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 02:45:44,095 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [78713875] [2022-02-24 02:45:44,095 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [78713875] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 02:45:44,095 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 02:45:44,095 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [] total 28 [2022-02-24 02:45:44,095 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1983846646] [2022-02-24 02:45:44,096 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 02:45:44,096 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-02-24 02:45:44,096 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 02:45:44,096 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-02-24 02:45:44,096 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=745, Unknown=0, NotChecked=0, Total=812 [2022-02-24 02:45:44,097 INFO L87 Difference]: Start difference. First operand 34 states and 35 transitions. Second operand has 28 states, 27 states have (on average 1.037037037037037) internal successors, (28), 26 states have internal predecessors, (28), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:45:44,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 02:45:44,618 INFO L93 Difference]: Finished difference Result 45 states and 49 transitions. [2022-02-24 02:45:44,618 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-02-24 02:45:44,618 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 27 states have (on average 1.037037037037037) internal successors, (28), 26 states have internal predecessors, (28), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 32 [2022-02-24 02:45:44,619 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 02:45:44,620 INFO L225 Difference]: With dead ends: 45 [2022-02-24 02:45:44,620 INFO L226 Difference]: Without dead ends: 37 [2022-02-24 02:45:44,620 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 4 SyntacticMatches, 2 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 536 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=173, Invalid=2377, Unknown=0, NotChecked=0, Total=2550 [2022-02-24 02:45:44,621 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 27 mSDsluCounter, 107 mSDsCounter, 0 mSdLazyCounter, 631 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 118 SdHoareTripleChecker+Invalid, 650 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 631 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-02-24 02:45:44,621 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 118 Invalid, 650 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 631 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-02-24 02:45:44,621 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2022-02-24 02:45:44,624 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2022-02-24 02:45:44,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 32 states have (on average 1.0625) internal successors, (34), 32 states have internal predecessors, (34), 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) [2022-02-24 02:45:44,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 38 transitions. [2022-02-24 02:45:44,625 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 38 transitions. Word has length 32 [2022-02-24 02:45:44,625 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 02:45:44,625 INFO L470 AbstractCegarLoop]: Abstraction has 37 states and 38 transitions. [2022-02-24 02:45:44,625 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 27 states have (on average 1.037037037037037) internal successors, (28), 26 states have internal predecessors, (28), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:45:44,625 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 38 transitions. [2022-02-24 02:45:44,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-02-24 02:45:44,626 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 02:45:44,626 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 02:45:44,626 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2022-02-24 02:45:44,626 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 02:45:44,626 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 02:45:44,626 INFO L85 PathProgramCache]: Analyzing trace with hash -1961252404, now seen corresponding path program 8 times [2022-02-24 02:45:44,626 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 02:45:44,626 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1889225400] [2022-02-24 02:45:44,627 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 02:45:44,627 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 02:45:44,735 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 02:45:44,883 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 02:45:44,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:45:44,928 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 02:45:44,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:45:44,931 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 02:45:45,300 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 02:45:45,300 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1889225400] [2022-02-24 02:45:45,300 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1889225400] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 02:45:45,300 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 02:45:45,300 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2022-02-24 02:45:45,301 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [757797200] [2022-02-24 02:45:45,301 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 02:45:45,301 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-02-24 02:45:45,301 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 02:45:45,301 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-02-24 02:45:45,302 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=918, Unknown=0, NotChecked=0, Total=992 [2022-02-24 02:45:45,302 INFO L87 Difference]: Start difference. First operand 37 states and 38 transitions. Second operand has 31 states, 30 states have (on average 1.0333333333333334) internal successors, (31), 29 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) [2022-02-24 02:45:45,890 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 02:45:45,891 INFO L93 Difference]: Finished difference Result 48 states and 52 transitions. [2022-02-24 02:45:45,891 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-02-24 02:45:45,891 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 30 states have (on average 1.0333333333333334) internal successors, (31), 29 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 [2022-02-24 02:45:45,891 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 02:45:45,891 INFO L225 Difference]: With dead ends: 48 [2022-02-24 02:45:45,892 INFO L226 Difference]: Without dead ends: 40 [2022-02-24 02:45:45,892 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 4 SyntacticMatches, 2 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 683 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=194, Invalid=2998, Unknown=0, NotChecked=0, Total=3192 [2022-02-24 02:45:45,893 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 29 mSDsluCounter, 127 mSDsCounter, 0 mSdLazyCounter, 823 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 138 SdHoareTripleChecker+Invalid, 844 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 823 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-02-24 02:45:45,893 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 138 Invalid, 844 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 823 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-02-24 02:45:45,893 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2022-02-24 02:45:45,896 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2022-02-24 02:45:45,897 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 35 states have (on average 1.0571428571428572) internal successors, (37), 35 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) [2022-02-24 02:45:45,897 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 41 transitions. [2022-02-24 02:45:45,897 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 41 transitions. Word has length 35 [2022-02-24 02:45:45,897 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 02:45:45,897 INFO L470 AbstractCegarLoop]: Abstraction has 40 states and 41 transitions. [2022-02-24 02:45:45,897 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 30 states have (on average 1.0333333333333334) internal successors, (31), 29 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) [2022-02-24 02:45:45,897 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 41 transitions. [2022-02-24 02:45:45,898 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-02-24 02:45:45,898 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 02:45:45,898 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 02:45:45,898 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2022-02-24 02:45:45,898 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 02:45:45,898 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 02:45:45,899 INFO L85 PathProgramCache]: Analyzing trace with hash -1680828663, now seen corresponding path program 9 times [2022-02-24 02:45:45,899 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 02:45:45,899 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [346238892] [2022-02-24 02:45:45,899 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 02:45:45,899 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 02:45:45,990 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 02:45:46,122 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 02:45:46,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:45:46,162 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 02:45:46,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:45:46,166 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 02:45:46,623 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 02:45:46,624 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [346238892] [2022-02-24 02:45:46,624 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [346238892] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 02:45:46,624 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 02:45:46,624 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [34] imperfect sequences [] total 34 [2022-02-24 02:45:46,624 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [532477217] [2022-02-24 02:45:46,624 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 02:45:46,624 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2022-02-24 02:45:46,624 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 02:45:46,625 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2022-02-24 02:45:46,625 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=1046, Unknown=0, NotChecked=0, Total=1122 [2022-02-24 02:45:46,625 INFO L87 Difference]: Start difference. First operand 40 states and 41 transitions. Second operand has 34 states, 33 states have (on average 1.0303030303030303) internal successors, (34), 32 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:45:47,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 02:45:47,311 INFO L93 Difference]: Finished difference Result 52 states and 56 transitions. [2022-02-24 02:45:47,311 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-02-24 02:45:47,311 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 33 states have (on average 1.0303030303030303) internal successors, (34), 32 states have internal predecessors, (34), 2 states have call successors, (3), 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 38 [2022-02-24 02:45:47,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 02:45:47,312 INFO L225 Difference]: With dead ends: 52 [2022-02-24 02:45:47,312 INFO L226 Difference]: Without dead ends: 44 [2022-02-24 02:45:47,313 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 4 SyntacticMatches, 2 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 761 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=208, Invalid=3574, Unknown=0, NotChecked=0, Total=3782 [2022-02-24 02:45:47,313 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 34 mSDsluCounter, 122 mSDsCounter, 0 mSdLazyCounter, 871 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 132 SdHoareTripleChecker+Invalid, 894 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 871 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-02-24 02:45:47,313 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [34 Valid, 132 Invalid, 894 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 871 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-02-24 02:45:47,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-02-24 02:45:47,317 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2022-02-24 02:45:47,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 38 states have (on average 1.0526315789473684) internal successors, (40), 38 states have internal predecessors, (40), 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) [2022-02-24 02:45:47,317 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2022-02-24 02:45:47,317 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 38 [2022-02-24 02:45:47,317 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 02:45:47,317 INFO L470 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2022-02-24 02:45:47,317 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 33 states have (on average 1.0303030303030303) internal successors, (34), 32 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:45:47,318 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2022-02-24 02:45:47,318 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-02-24 02:45:47,318 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 02:45:47,318 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 02:45:47,318 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2022-02-24 02:45:47,318 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 02:45:47,319 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 02:45:47,319 INFO L85 PathProgramCache]: Analyzing trace with hash 486456110, now seen corresponding path program 1 times [2022-02-24 02:45:47,319 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 02:45:47,319 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1533017189] [2022-02-24 02:45:47,319 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 02:45:47,319 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 02:45:47,449 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 02:45:47,602 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:45:47,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:45:47,669 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 02:45:47,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:45:47,674 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 02:45:48,215 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 02:45:48,215 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1533017189] [2022-02-24 02:45:48,215 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1533017189] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 02:45:48,215 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 02:45:48,215 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [36] imperfect sequences [] total 36 [2022-02-24 02:45:48,215 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [354648328] [2022-02-24 02:45:48,215 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 02:45:48,216 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-02-24 02:45:48,216 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 02:45:48,217 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-02-24 02:45:48,217 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=1314, Unknown=0, NotChecked=0, Total=1406 [2022-02-24 02:45:48,217 INFO L87 Difference]: Start difference. First operand 43 states and 44 transitions. Second operand has 36 states, 35 states have (on average 1.0571428571428572) internal successors, (37), 34 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) [2022-02-24 02:45:49,011 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 02:45:49,011 INFO L93 Difference]: Finished difference Result 55 states and 59 transitions. [2022-02-24 02:45:49,012 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-02-24 02:45:49,013 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 35 states have (on average 1.0571428571428572) internal successors, (37), 34 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 [2022-02-24 02:45:49,013 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 02:45:49,013 INFO L225 Difference]: With dead ends: 55 [2022-02-24 02:45:49,013 INFO L226 Difference]: Without dead ends: 47 [2022-02-24 02:45:49,014 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 6 SyntacticMatches, 1 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1008 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=238, Invalid=4318, Unknown=0, NotChecked=0, Total=4556 [2022-02-24 02:45:49,015 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 37 mSDsluCounter, 142 mSDsCounter, 0 mSdLazyCounter, 1091 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 152 SdHoareTripleChecker+Invalid, 1115 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 1091 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-02-24 02:45:49,015 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 152 Invalid, 1115 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 1091 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-02-24 02:45:49,015 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2022-02-24 02:45:49,019 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 46. [2022-02-24 02:45:49,019 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 41 states have (on average 1.048780487804878) internal successors, (43), 41 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) [2022-02-24 02:45:49,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 47 transitions. [2022-02-24 02:45:49,019 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 47 transitions. Word has length 41 [2022-02-24 02:45:49,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 02:45:49,020 INFO L470 AbstractCegarLoop]: Abstraction has 46 states and 47 transitions. [2022-02-24 02:45:49,020 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 35 states have (on average 1.0571428571428572) internal successors, (37), 34 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) [2022-02-24 02:45:49,020 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 47 transitions. [2022-02-24 02:45:49,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-02-24 02:45:49,020 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 02:45:49,020 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 9, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 02:45:49,021 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2022-02-24 02:45:49,021 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 02:45:49,021 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 02:45:49,021 INFO L85 PathProgramCache]: Analyzing trace with hash -176232215, now seen corresponding path program 2 times [2022-02-24 02:45:49,021 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 02:45:49,021 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1653907813] [2022-02-24 02:45:49,021 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 02:45:49,022 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 02:45:49,174 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:45:49,298 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:45:49,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:45:49,370 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 02:45:49,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:45:49,380 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 02:45:49,989 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 02:45:49,989 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1653907813] [2022-02-24 02:45:49,989 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1653907813] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 02:45:49,989 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 02:45:49,990 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [39] imperfect sequences [] total 39 [2022-02-24 02:45:49,990 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1952482941] [2022-02-24 02:45:49,990 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 02:45:49,990 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2022-02-24 02:45:49,990 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 02:45:49,990 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2022-02-24 02:45:49,991 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=1447, Unknown=0, NotChecked=0, Total=1560 [2022-02-24 02:45:49,991 INFO L87 Difference]: Start difference. First operand 46 states and 47 transitions. Second operand has 39 states, 38 states have (on average 1.0526315789473684) internal successors, (40), 37 states have internal predecessors, (40), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:45:51,035 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 02:45:51,035 INFO L93 Difference]: Finished difference Result 58 states and 62 transitions. [2022-02-24 02:45:51,036 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-02-24 02:45:51,036 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 38 states have (on average 1.0526315789473684) internal successors, (40), 37 states have internal predecessors, (40), 2 states have call successors, (3), 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 44 [2022-02-24 02:45:51,036 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 02:45:51,036 INFO L225 Difference]: With dead ends: 58 [2022-02-24 02:45:51,036 INFO L226 Difference]: Without dead ends: 50 [2022-02-24 02:45:51,038 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 5 SyntacticMatches, 3 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1481 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=311, Invalid=4945, Unknown=0, NotChecked=0, Total=5256 [2022-02-24 02:45:51,038 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 41 mSDsluCounter, 132 mSDsCounter, 0 mSdLazyCounter, 1087 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 142 SdHoareTripleChecker+Invalid, 1126 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 1087 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-02-24 02:45:51,038 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [41 Valid, 142 Invalid, 1126 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 1087 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-02-24 02:45:51,039 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2022-02-24 02:45:51,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 49. [2022-02-24 02:45:51,043 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 44 states have (on average 1.0454545454545454) internal successors, (46), 44 states have internal predecessors, (46), 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) [2022-02-24 02:45:51,045 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 50 transitions. [2022-02-24 02:45:51,045 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 50 transitions. Word has length 44 [2022-02-24 02:45:51,045 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 02:45:51,045 INFO L470 AbstractCegarLoop]: Abstraction has 49 states and 50 transitions. [2022-02-24 02:45:51,045 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 38 states have (on average 1.0526315789473684) internal successors, (40), 37 states have internal predecessors, (40), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:45:51,045 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 50 transitions. [2022-02-24 02:45:51,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-02-24 02:45:51,050 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 02:45:51,050 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 9, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 02:45:51,050 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2022-02-24 02:45:51,050 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 02:45:51,050 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 02:45:51,050 INFO L85 PathProgramCache]: Analyzing trace with hash 1640537422, now seen corresponding path program 3 times [2022-02-24 02:45:51,050 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 02:45:51,050 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1256543581] [2022-02-24 02:45:51,050 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 02:45:51,053 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 02:45:51,170 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:45:51,311 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:45:51,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:45:51,417 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 02:45:51,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:45:51,423 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 02:45:52,078 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 02:45:52,078 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1256543581] [2022-02-24 02:45:52,078 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1256543581] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 02:45:52,078 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 02:45:52,078 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [40] imperfect sequences [] total 40 [2022-02-24 02:45:52,079 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2055657883] [2022-02-24 02:45:52,079 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 02:45:52,079 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-02-24 02:45:52,079 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 02:45:52,079 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-02-24 02:45:52,080 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=1620, Unknown=0, NotChecked=0, Total=1722 [2022-02-24 02:45:52,080 INFO L87 Difference]: Start difference. First operand 49 states and 50 transitions. Second operand has 40 states, 39 states have (on average 1.1025641025641026) internal successors, (43), 38 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) [2022-02-24 02:45:52,999 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 02:45:52,999 INFO L93 Difference]: Finished difference Result 61 states and 65 transitions. [2022-02-24 02:45:53,000 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-02-24 02:45:53,000 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 39 states have (on average 1.1025641025641026) internal successors, (43), 38 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 [2022-02-24 02:45:53,000 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 02:45:53,000 INFO L225 Difference]: With dead ends: 61 [2022-02-24 02:45:53,000 INFO L226 Difference]: Without dead ends: 53 [2022-02-24 02:45:53,002 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 7 SyntacticMatches, 2 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1303 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=268, Invalid=5432, Unknown=0, NotChecked=0, Total=5700 [2022-02-24 02:45:53,002 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 45 mSDsluCounter, 147 mSDsCounter, 0 mSdLazyCounter, 1309 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 157 SdHoareTripleChecker+Invalid, 1335 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 1309 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-02-24 02:45:53,002 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [45 Valid, 157 Invalid, 1335 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 1309 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-02-24 02:45:53,003 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2022-02-24 02:45:53,006 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 52. [2022-02-24 02:45:53,007 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 47 states have (on average 1.0425531914893618) internal successors, (49), 47 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) [2022-02-24 02:45:53,007 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 53 transitions. [2022-02-24 02:45:53,007 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 53 transitions. Word has length 47 [2022-02-24 02:45:53,007 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 02:45:53,007 INFO L470 AbstractCegarLoop]: Abstraction has 52 states and 53 transitions. [2022-02-24 02:45:53,007 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 39 states have (on average 1.1025641025641026) internal successors, (43), 38 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) [2022-02-24 02:45:53,007 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 53 transitions. [2022-02-24 02:45:53,008 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-02-24 02:45:53,008 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 02:45:53,008 INFO L514 BasicCegarLoop]: trace histogram [13, 13, 9, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 02:45:53,008 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2022-02-24 02:45:53,008 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 02:45:53,008 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 02:45:53,008 INFO L85 PathProgramCache]: Analyzing trace with hash -153070903, now seen corresponding path program 4 times [2022-02-24 02:45:53,008 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 02:45:53,008 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1266704199] [2022-02-24 02:45:53,008 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 02:45:53,009 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 02:45:53,156 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:45:53,305 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:45:53,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:45:53,368 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 02:45:53,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:45:53,373 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 02:45:54,159 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 02:45:54,159 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1266704199] [2022-02-24 02:45:54,159 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1266704199] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 02:45:54,159 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 02:45:54,159 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [43] imperfect sequences [] total 43 [2022-02-24 02:45:54,160 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1051169215] [2022-02-24 02:45:54,160 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 02:45:54,160 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2022-02-24 02:45:54,160 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 02:45:54,160 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2022-02-24 02:45:54,161 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=1769, Unknown=0, NotChecked=0, Total=1892 [2022-02-24 02:45:54,161 INFO L87 Difference]: Start difference. First operand 52 states and 53 transitions. Second operand has 43 states, 42 states have (on average 1.0952380952380953) internal successors, (46), 41 states have internal predecessors, (46), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:45:55,327 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 02:45:55,327 INFO L93 Difference]: Finished difference Result 64 states and 68 transitions. [2022-02-24 02:45:55,327 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-02-24 02:45:55,327 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 42 states have (on average 1.0952380952380953) internal successors, (46), 41 states have internal predecessors, (46), 2 states have call successors, (3), 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 50 [2022-02-24 02:45:55,328 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 02:45:55,328 INFO L225 Difference]: With dead ends: 64 [2022-02-24 02:45:55,328 INFO L226 Difference]: Without dead ends: 56 [2022-02-24 02:45:55,330 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 7 SyntacticMatches, 2 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1802 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=341, Invalid=6139, Unknown=0, NotChecked=0, Total=6480 [2022-02-24 02:45:55,330 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 50 mSDsluCounter, 122 mSDsCounter, 0 mSdLazyCounter, 1161 mSolverCounterSat, 43 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 132 SdHoareTripleChecker+Invalid, 1204 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 43 IncrementalHoareTripleChecker+Valid, 1161 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-02-24 02:45:55,330 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [50 Valid, 132 Invalid, 1204 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [43 Valid, 1161 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-02-24 02:45:55,330 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2022-02-24 02:45:55,336 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2022-02-24 02:45:55,336 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 50 states have (on average 1.04) internal successors, (52), 50 states have internal predecessors, (52), 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) [2022-02-24 02:45:55,336 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 56 transitions. [2022-02-24 02:45:55,337 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 56 transitions. Word has length 50 [2022-02-24 02:45:55,337 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 02:45:55,337 INFO L470 AbstractCegarLoop]: Abstraction has 55 states and 56 transitions. [2022-02-24 02:45:55,337 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 42 states have (on average 1.0952380952380953) internal successors, (46), 41 states have internal predecessors, (46), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:45:55,337 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 56 transitions. [2022-02-24 02:45:55,337 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2022-02-24 02:45:55,337 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 02:45:55,337 INFO L514 BasicCegarLoop]: trace histogram [14, 14, 9, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 02:45:55,337 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2022-02-24 02:45:55,338 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 02:45:55,338 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 02:45:55,338 INFO L85 PathProgramCache]: Analyzing trace with hash 149448558, now seen corresponding path program 5 times [2022-02-24 02:45:55,338 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 02:45:55,338 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1817082466] [2022-02-24 02:45:55,338 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 02:45:55,338 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 02:45:55,458 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:45:55,576 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:45:55,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:45:55,642 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 02:45:55,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:45:55,648 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 02:45:56,393 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 02:45:56,394 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1817082466] [2022-02-24 02:45:56,394 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1817082466] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 02:45:56,394 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 02:45:56,394 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [44] imperfect sequences [] total 44 [2022-02-24 02:45:56,394 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [183633215] [2022-02-24 02:45:56,394 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 02:45:56,394 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2022-02-24 02:45:56,394 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 02:45:56,394 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2022-02-24 02:45:56,395 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=1874, Unknown=0, NotChecked=0, Total=1980 [2022-02-24 02:45:56,395 INFO L87 Difference]: Start difference. First operand 55 states and 56 transitions. Second operand has 44 states, 43 states have (on average 1.1395348837209303) internal successors, (49), 42 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) [2022-02-24 02:45:57,504 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 02:45:57,504 INFO L93 Difference]: Finished difference Result 67 states and 71 transitions. [2022-02-24 02:45:57,504 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2022-02-24 02:45:57,504 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 43 states have (on average 1.1395348837209303) internal successors, (49), 42 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 [2022-02-24 02:45:57,504 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 02:45:57,505 INFO L225 Difference]: With dead ends: 67 [2022-02-24 02:45:57,505 INFO L226 Difference]: Without dead ends: 59 [2022-02-24 02:45:57,506 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 10 SyntacticMatches, 1 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1516 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=290, Invalid=6516, Unknown=0, NotChecked=0, Total=6806 [2022-02-24 02:45:57,507 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 54 mSDsluCounter, 167 mSDsCounter, 0 mSdLazyCounter, 1684 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 177 SdHoareTripleChecker+Invalid, 1712 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 1684 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-02-24 02:45:57,507 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [54 Valid, 177 Invalid, 1712 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 1684 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-02-24 02:45:57,507 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2022-02-24 02:45:57,511 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 58. [2022-02-24 02:45:57,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 53 states have (on average 1.0377358490566038) internal successors, (55), 53 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) [2022-02-24 02:45:57,512 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 59 transitions. [2022-02-24 02:45:57,512 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 59 transitions. Word has length 53 [2022-02-24 02:45:57,512 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 02:45:57,512 INFO L470 AbstractCegarLoop]: Abstraction has 58 states and 59 transitions. [2022-02-24 02:45:57,512 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 43 states have (on average 1.1395348837209303) internal successors, (49), 42 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) [2022-02-24 02:45:57,512 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 59 transitions. [2022-02-24 02:45:57,513 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2022-02-24 02:45:57,513 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 02:45:57,513 INFO L514 BasicCegarLoop]: trace histogram [15, 15, 9, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 02:45:57,513 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2022-02-24 02:45:57,513 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 02:45:57,513 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 02:45:57,513 INFO L85 PathProgramCache]: Analyzing trace with hash 1665324201, now seen corresponding path program 6 times [2022-02-24 02:45:57,513 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 02:45:57,513 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1424372867] [2022-02-24 02:45:57,513 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 02:45:57,514 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 02:45:57,657 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:45:57,822 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:45:57,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:45:57,898 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 02:45:57,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:45:57,901 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 02:45:58,711 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 02:45:58,711 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1424372867] [2022-02-24 02:45:58,711 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1424372867] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 02:45:58,711 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 02:45:58,711 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [46] imperfect sequences [] total 46 [2022-02-24 02:45:58,711 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1420640342] [2022-02-24 02:45:58,711 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 02:45:58,711 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2022-02-24 02:45:58,711 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 02:45:58,712 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2022-02-24 02:45:58,712 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=2139, Unknown=0, NotChecked=0, Total=2256 [2022-02-24 02:45:58,712 INFO L87 Difference]: Start difference. First operand 58 states and 59 transitions. Second operand has 46 states, 45 states have (on average 1.1555555555555554) internal successors, (52), 44 states have internal predecessors, (52), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:45:59,892 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 02:45:59,893 INFO L93 Difference]: Finished difference Result 70 states and 74 transitions. [2022-02-24 02:45:59,893 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2022-02-24 02:45:59,893 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 45 states have (on average 1.1555555555555554) internal successors, (52), 44 states have internal predecessors, (52), 2 states have call successors, (3), 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 56 [2022-02-24 02:45:59,893 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 02:45:59,894 INFO L225 Difference]: With dead ends: 70 [2022-02-24 02:45:59,894 INFO L226 Difference]: Without dead ends: 62 [2022-02-24 02:45:59,895 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 10 SyntacticMatches, 2 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1816 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=313, Invalid=7343, Unknown=0, NotChecked=0, Total=7656 [2022-02-24 02:45:59,896 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 57 mSDsluCounter, 177 mSDsCounter, 0 mSdLazyCounter, 1887 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 187 SdHoareTripleChecker+Invalid, 1916 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 1887 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-02-24 02:45:59,896 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [57 Valid, 187 Invalid, 1916 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 1887 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-02-24 02:45:59,896 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2022-02-24 02:45:59,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2022-02-24 02:45:59,901 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 56 states have (on average 1.0357142857142858) internal successors, (58), 56 states have internal predecessors, (58), 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) [2022-02-24 02:45:59,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 62 transitions. [2022-02-24 02:45:59,901 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 62 transitions. Word has length 56 [2022-02-24 02:45:59,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 02:45:59,901 INFO L470 AbstractCegarLoop]: Abstraction has 61 states and 62 transitions. [2022-02-24 02:45:59,901 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 45 states have (on average 1.1555555555555554) internal successors, (52), 44 states have internal predecessors, (52), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:45:59,902 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 62 transitions. [2022-02-24 02:45:59,902 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-02-24 02:45:59,902 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 02:45:59,902 INFO L514 BasicCegarLoop]: trace histogram [16, 16, 9, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 02:45:59,902 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2022-02-24 02:45:59,902 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 02:45:59,902 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 02:45:59,902 INFO L85 PathProgramCache]: Analyzing trace with hash -464512626, now seen corresponding path program 7 times [2022-02-24 02:45:59,902 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 02:45:59,902 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1353844159] [2022-02-24 02:45:59,903 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 02:45:59,903 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 02:46:00,014 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:46:00,134 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:46:00,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:46:00,216 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 02:46:00,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:46:00,222 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 02:46:01,175 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 02:46:01,175 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1353844159] [2022-02-24 02:46:01,176 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1353844159] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 02:46:01,176 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 02:46:01,176 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [48] imperfect sequences [] total 48 [2022-02-24 02:46:01,176 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1439522805] [2022-02-24 02:46:01,176 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 02:46:01,176 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2022-02-24 02:46:01,176 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 02:46:01,176 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2022-02-24 02:46:01,177 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=2328, Unknown=0, NotChecked=0, Total=2450 [2022-02-24 02:46:01,177 INFO L87 Difference]: Start difference. First operand 61 states and 62 transitions. Second operand has 48 states, 47 states have (on average 1.1702127659574468) internal successors, (55), 46 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) [2022-02-24 02:46:02,448 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 02:46:02,448 INFO L93 Difference]: Finished difference Result 73 states and 77 transitions. [2022-02-24 02:46:02,449 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2022-02-24 02:46:02,449 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 47 states have (on average 1.1702127659574468) internal successors, (55), 46 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 [2022-02-24 02:46:02,449 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 02:46:02,449 INFO L225 Difference]: With dead ends: 73 [2022-02-24 02:46:02,449 INFO L226 Difference]: Without dead ends: 65 [2022-02-24 02:46:02,450 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 11 SyntacticMatches, 2 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2007 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=328, Invalid=8044, Unknown=0, NotChecked=0, Total=8372 [2022-02-24 02:46:02,451 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 61 mSDsluCounter, 177 mSDsCounter, 0 mSdLazyCounter, 1996 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 187 SdHoareTripleChecker+Invalid, 2026 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 1996 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-02-24 02:46:02,451 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [61 Valid, 187 Invalid, 2026 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 1996 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-02-24 02:46:02,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2022-02-24 02:46:02,456 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 64. [2022-02-24 02:46:02,456 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 59 states have (on average 1.0338983050847457) internal successors, (61), 59 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) [2022-02-24 02:46:02,456 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 65 transitions. [2022-02-24 02:46:02,456 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 65 transitions. Word has length 59 [2022-02-24 02:46:02,456 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 02:46:02,457 INFO L470 AbstractCegarLoop]: Abstraction has 64 states and 65 transitions. [2022-02-24 02:46:02,457 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 47 states have (on average 1.1702127659574468) internal successors, (55), 46 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) [2022-02-24 02:46:02,457 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 65 transitions. [2022-02-24 02:46:02,457 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2022-02-24 02:46:02,457 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 02:46:02,457 INFO L514 BasicCegarLoop]: trace histogram [17, 17, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 02:46:02,457 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2022-02-24 02:46:02,457 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 02:46:02,458 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 02:46:02,458 INFO L85 PathProgramCache]: Analyzing trace with hash -881561975, now seen corresponding path program 8 times [2022-02-24 02:46:02,458 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 02:46:02,458 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1070585135] [2022-02-24 02:46:02,458 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 02:46:02,458 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 02:46:02,571 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:46:02,716 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:46:02,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:46:02,774 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 02:46:02,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:46:02,787 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 02:46:03,715 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 02:46:03,716 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1070585135] [2022-02-24 02:46:03,716 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1070585135] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 02:46:03,716 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 02:46:03,716 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [50] imperfect sequences [] total 50 [2022-02-24 02:46:03,716 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [882514684] [2022-02-24 02:46:03,716 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 02:46:03,716 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2022-02-24 02:46:03,716 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 02:46:03,716 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2022-02-24 02:46:03,717 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=127, Invalid=2525, Unknown=0, NotChecked=0, Total=2652 [2022-02-24 02:46:03,717 INFO L87 Difference]: Start difference. First operand 64 states and 65 transitions. Second operand has 50 states, 49 states have (on average 1.183673469387755) internal successors, (58), 48 states have internal predecessors, (58), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:46:05,017 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 02:46:05,018 INFO L93 Difference]: Finished difference Result 76 states and 80 transitions. [2022-02-24 02:46:05,025 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2022-02-24 02:46:05,025 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 49 states have (on average 1.183673469387755) internal successors, (58), 48 states have internal predecessors, (58), 2 states have call successors, (3), 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 62 [2022-02-24 02:46:05,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 02:46:05,026 INFO L225 Difference]: With dead ends: 76 [2022-02-24 02:46:05,026 INFO L226 Difference]: Without dead ends: 68 [2022-02-24 02:46:05,027 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2208 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=343, Invalid=8777, Unknown=0, NotChecked=0, Total=9120 [2022-02-24 02:46:05,028 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 66 mSDsluCounter, 177 mSDsCounter, 0 mSdLazyCounter, 2105 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 187 SdHoareTripleChecker+Invalid, 2136 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 2105 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-02-24 02:46:05,028 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [66 Valid, 187 Invalid, 2136 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 2105 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-02-24 02:46:05,028 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2022-02-24 02:46:05,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2022-02-24 02:46:05,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 62 states have (on average 1.032258064516129) internal successors, (64), 62 states have internal predecessors, (64), 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) [2022-02-24 02:46:05,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 68 transitions. [2022-02-24 02:46:05,033 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 68 transitions. Word has length 62 [2022-02-24 02:46:05,033 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 02:46:05,033 INFO L470 AbstractCegarLoop]: Abstraction has 67 states and 68 transitions. [2022-02-24 02:46:05,033 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 49 states have (on average 1.183673469387755) internal successors, (58), 48 states have internal predecessors, (58), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:46:05,033 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 68 transitions. [2022-02-24 02:46:05,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2022-02-24 02:46:05,034 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 02:46:05,034 INFO L514 BasicCegarLoop]: trace histogram [18, 18, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 02:46:05,034 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2022-02-24 02:46:05,034 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 02:46:05,034 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 02:46:05,034 INFO L85 PathProgramCache]: Analyzing trace with hash 141669294, now seen corresponding path program 9 times [2022-02-24 02:46:05,034 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 02:46:05,034 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1434698649] [2022-02-24 02:46:05,034 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 02:46:05,035 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 02:46:05,173 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:46:05,320 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:46:05,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:46:05,414 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 02:46:05,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:46:05,421 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 02:46:06,512 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 02:46:06,513 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1434698649] [2022-02-24 02:46:06,513 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1434698649] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 02:46:06,513 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 02:46:06,513 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [52] imperfect sequences [] total 52 [2022-02-24 02:46:06,513 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [785771807] [2022-02-24 02:46:06,513 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 02:46:06,513 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2022-02-24 02:46:06,513 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 02:46:06,513 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2022-02-24 02:46:06,514 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=2730, Unknown=0, NotChecked=0, Total=2862 [2022-02-24 02:46:06,514 INFO L87 Difference]: Start difference. First operand 67 states and 68 transitions. Second operand has 52 states, 51 states have (on average 1.196078431372549) internal successors, (61), 50 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) [2022-02-24 02:46:07,997 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 02:46:07,997 INFO L93 Difference]: Finished difference Result 79 states and 83 transitions. [2022-02-24 02:46:07,997 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2022-02-24 02:46:07,998 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 51 states have (on average 1.196078431372549) internal successors, (61), 50 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 [2022-02-24 02:46:07,998 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 02:46:07,998 INFO L225 Difference]: With dead ends: 79 [2022-02-24 02:46:07,998 INFO L226 Difference]: Without dead ends: 71 [2022-02-24 02:46:08,000 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2416 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=358, Invalid=9542, Unknown=0, NotChecked=0, Total=9900 [2022-02-24 02:46:08,000 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 69 mSDsluCounter, 187 mSDsCounter, 0 mSdLazyCounter, 2333 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 197 SdHoareTripleChecker+Invalid, 2365 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 2333 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-02-24 02:46:08,000 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [69 Valid, 197 Invalid, 2365 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 2333 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-02-24 02:46:08,000 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2022-02-24 02:46:08,005 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 70. [2022-02-24 02:46:08,005 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 65 states have (on average 1.0307692307692307) internal successors, (67), 65 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) [2022-02-24 02:46:08,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 71 transitions. [2022-02-24 02:46:08,005 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 71 transitions. Word has length 65 [2022-02-24 02:46:08,006 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 02:46:08,006 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 71 transitions. [2022-02-24 02:46:08,006 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 51 states have (on average 1.196078431372549) internal successors, (61), 50 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) [2022-02-24 02:46:08,006 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 71 transitions. [2022-02-24 02:46:08,006 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2022-02-24 02:46:08,006 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 02:46:08,006 INFO L514 BasicCegarLoop]: trace histogram [19, 19, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 02:46:08,006 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2022-02-24 02:46:08,006 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 02:46:08,006 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 02:46:08,007 INFO L85 PathProgramCache]: Analyzing trace with hash 1841504361, now seen corresponding path program 10 times [2022-02-24 02:46:08,007 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 02:46:08,007 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1304182255] [2022-02-24 02:46:08,007 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 02:46:08,007 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 02:46:08,161 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:46:08,298 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:46:08,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:46:08,376 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 02:46:08,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:46:08,379 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 02:46:09,655 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 02:46:09,655 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1304182255] [2022-02-24 02:46:09,655 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1304182255] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 02:46:09,655 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 02:46:09,655 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [55] imperfect sequences [] total 55 [2022-02-24 02:46:09,655 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [461242503] [2022-02-24 02:46:09,655 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 02:46:09,656 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2022-02-24 02:46:09,656 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 02:46:09,656 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2022-02-24 02:46:09,657 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=2927, Unknown=0, NotChecked=0, Total=3080 [2022-02-24 02:46:09,657 INFO L87 Difference]: Start difference. First operand 70 states and 71 transitions. Second operand has 55 states, 54 states have (on average 1.1851851851851851) internal successors, (64), 53 states have internal predecessors, (64), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:46:11,809 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 02:46:11,810 INFO L93 Difference]: Finished difference Result 82 states and 86 transitions. [2022-02-24 02:46:11,810 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2022-02-24 02:46:11,810 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 54 states have (on average 1.1851851851851851) internal successors, (64), 53 states have internal predecessors, (64), 2 states have call successors, (3), 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 68 [2022-02-24 02:46:11,810 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 02:46:11,811 INFO L225 Difference]: With dead ends: 82 [2022-02-24 02:46:11,811 INFO L226 Difference]: Without dead ends: 74 [2022-02-24 02:46:11,812 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 14 SyntacticMatches, 2 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3297 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=431, Invalid=10489, Unknown=0, NotChecked=0, Total=10920 [2022-02-24 02:46:11,812 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 73 mSDsluCounter, 172 mSDsCounter, 0 mSdLazyCounter, 2248 mSolverCounterSat, 48 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 182 SdHoareTripleChecker+Invalid, 2296 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 48 IncrementalHoareTripleChecker+Valid, 2248 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-02-24 02:46:11,812 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [73 Valid, 182 Invalid, 2296 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [48 Valid, 2248 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-02-24 02:46:11,813 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2022-02-24 02:46:11,818 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2022-02-24 02:46:11,818 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 68 states have (on average 1.0294117647058822) internal successors, (70), 68 states have internal predecessors, (70), 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) [2022-02-24 02:46:11,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 74 transitions. [2022-02-24 02:46:11,818 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 74 transitions. Word has length 68 [2022-02-24 02:46:11,818 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 02:46:11,819 INFO L470 AbstractCegarLoop]: Abstraction has 73 states and 74 transitions. [2022-02-24 02:46:11,819 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 54 states have (on average 1.1851851851851851) internal successors, (64), 53 states have internal predecessors, (64), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:46:11,819 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 74 transitions. [2022-02-24 02:46:11,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2022-02-24 02:46:11,819 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 02:46:11,819 INFO L514 BasicCegarLoop]: trace histogram [20, 20, 11, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 02:46:11,819 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2022-02-24 02:46:11,819 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 02:46:11,820 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 02:46:11,820 INFO L85 PathProgramCache]: Analyzing trace with hash -331401778, now seen corresponding path program 11 times [2022-02-24 02:46:11,820 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 02:46:11,820 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [9681994] [2022-02-24 02:46:11,820 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 02:46:11,820 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 02:46:11,940 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:46:12,084 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:46:12,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:46:12,143 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 02:46:12,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:46:12,145 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 02:46:13,289 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 02:46:13,289 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [9681994] [2022-02-24 02:46:13,289 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [9681994] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 02:46:13,289 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 02:46:13,289 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [56] imperfect sequences [] total 56 [2022-02-24 02:46:13,289 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [751843231] [2022-02-24 02:46:13,290 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 02:46:13,290 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2022-02-24 02:46:13,290 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 02:46:13,290 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2022-02-24 02:46:13,291 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=3164, Unknown=0, NotChecked=0, Total=3306 [2022-02-24 02:46:13,291 INFO L87 Difference]: Start difference. First operand 73 states and 74 transitions. Second operand has 56 states, 55 states have (on average 1.2181818181818183) internal successors, (67), 54 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) [2022-02-24 02:46:15,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 02:46:15,058 INFO L93 Difference]: Finished difference Result 85 states and 89 transitions. [2022-02-24 02:46:15,060 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2022-02-24 02:46:15,060 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 55 states have (on average 1.2181818181818183) internal successors, (67), 54 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 [2022-02-24 02:46:15,060 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 02:46:15,061 INFO L225 Difference]: With dead ends: 85 [2022-02-24 02:46:15,061 INFO L226 Difference]: Without dead ends: 77 [2022-02-24 02:46:15,062 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2868 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=388, Invalid=11168, Unknown=0, NotChecked=0, Total=11556 [2022-02-24 02:46:15,062 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 78 mSDsluCounter, 222 mSDsCounter, 0 mSdLazyCounter, 3028 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 78 SdHoareTripleChecker+Valid, 232 SdHoareTripleChecker+Invalid, 3062 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 3028 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-02-24 02:46:15,062 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [78 Valid, 232 Invalid, 3062 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 3028 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-02-24 02:46:15,063 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2022-02-24 02:46:15,067 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 76. [2022-02-24 02:46:15,068 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 71 states have (on average 1.028169014084507) internal successors, (73), 71 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) [2022-02-24 02:46:15,068 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 77 transitions. [2022-02-24 02:46:15,068 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 77 transitions. Word has length 71 [2022-02-24 02:46:15,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 02:46:15,068 INFO L470 AbstractCegarLoop]: Abstraction has 76 states and 77 transitions. [2022-02-24 02:46:15,068 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 55 states have (on average 1.2181818181818183) internal successors, (67), 54 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) [2022-02-24 02:46:15,068 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 77 transitions. [2022-02-24 02:46:15,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2022-02-24 02:46:15,069 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 02:46:15,069 INFO L514 BasicCegarLoop]: trace histogram [21, 21, 12, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 02:46:15,069 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2022-02-24 02:46:15,069 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 02:46:15,069 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 02:46:15,069 INFO L85 PathProgramCache]: Analyzing trace with hash 368896585, now seen corresponding path program 12 times [2022-02-24 02:46:15,069 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 02:46:15,069 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [566726275] [2022-02-24 02:46:15,069 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 02:46:15,070 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 02:46:15,182 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:46:15,327 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:46:15,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:46:15,428 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 02:46:15,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:46:15,431 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 02:46:17,138 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 02:46:17,138 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [566726275] [2022-02-24 02:46:17,138 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [566726275] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 02:46:17,138 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 02:46:17,138 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [59] imperfect sequences [] total 59 [2022-02-24 02:46:17,138 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1657032323] [2022-02-24 02:46:17,138 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 02:46:17,139 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2022-02-24 02:46:17,139 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 02:46:17,139 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2022-02-24 02:46:17,139 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=3377, Unknown=0, NotChecked=0, Total=3540 [2022-02-24 02:46:17,140 INFO L87 Difference]: Start difference. First operand 76 states and 77 transitions. Second operand has 59 states, 58 states have (on average 1.206896551724138) internal successors, (70), 57 states have internal predecessors, (70), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:46:19,757 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 02:46:19,757 INFO L93 Difference]: Finished difference Result 88 states and 92 transitions. [2022-02-24 02:46:19,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2022-02-24 02:46:19,758 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 58 states have (on average 1.206896551724138) internal successors, (70), 57 states have internal predecessors, (70), 2 states have call successors, (3), 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 74 [2022-02-24 02:46:19,758 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 02:46:19,758 INFO L225 Difference]: With dead ends: 88 [2022-02-24 02:46:19,758 INFO L226 Difference]: Without dead ends: 80 [2022-02-24 02:46:19,759 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3851 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=461, Invalid=12195, Unknown=0, NotChecked=0, Total=12656 [2022-02-24 02:46:19,759 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 83 mSDsluCounter, 192 mSDsCounter, 0 mSdLazyCounter, 2733 mSolverCounterSat, 48 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 83 SdHoareTripleChecker+Valid, 202 SdHoareTripleChecker+Invalid, 2781 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 48 IncrementalHoareTripleChecker+Valid, 2733 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-02-24 02:46:19,759 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [83 Valid, 202 Invalid, 2781 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [48 Valid, 2733 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-02-24 02:46:19,760 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2022-02-24 02:46:19,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 79. [2022-02-24 02:46:19,765 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 74 states have (on average 1.027027027027027) internal successors, (76), 74 states have internal predecessors, (76), 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) [2022-02-24 02:46:19,765 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 80 transitions. [2022-02-24 02:46:19,765 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 80 transitions. Word has length 74 [2022-02-24 02:46:19,765 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 02:46:19,765 INFO L470 AbstractCegarLoop]: Abstraction has 79 states and 80 transitions. [2022-02-24 02:46:19,765 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 59 states, 58 states have (on average 1.206896551724138) internal successors, (70), 57 states have internal predecessors, (70), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:46:19,765 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 80 transitions. [2022-02-24 02:46:19,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2022-02-24 02:46:19,766 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 02:46:19,766 INFO L514 BasicCegarLoop]: trace histogram [22, 22, 13, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 02:46:19,766 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2022-02-24 02:46:19,766 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 02:46:19,766 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 02:46:19,766 INFO L85 PathProgramCache]: Analyzing trace with hash -1993695250, now seen corresponding path program 13 times [2022-02-24 02:46:19,766 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 02:46:19,766 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1489357306] [2022-02-24 02:46:19,766 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 02:46:19,767 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 02:46:19,887 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:46:19,994 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:46:20,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:46:20,079 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 02:46:20,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:46:20,084 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 02:46:21,994 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 02:46:21,994 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1489357306] [2022-02-24 02:46:21,994 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1489357306] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 02:46:21,994 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 02:46:21,994 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [61] imperfect sequences [] total 61 [2022-02-24 02:46:21,994 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [630003874] [2022-02-24 02:46:21,994 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 02:46:21,994 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 61 states [2022-02-24 02:46:21,994 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 02:46:21,995 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2022-02-24 02:46:21,995 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=3732, Unknown=0, NotChecked=0, Total=3906 [2022-02-24 02:46:21,996 INFO L87 Difference]: Start difference. First operand 79 states and 80 transitions. Second operand has 61 states, 60 states have (on average 1.2166666666666666) internal successors, (73), 59 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) [2022-02-24 02:46:24,952 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 02:46:24,953 INFO L93 Difference]: Finished difference Result 91 states and 95 transitions. [2022-02-24 02:46:24,953 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2022-02-24 02:46:24,953 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 60 states have (on average 1.2166666666666666) internal successors, (73), 59 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 [2022-02-24 02:46:24,953 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 02:46:24,954 INFO L225 Difference]: With dead ends: 91 [2022-02-24 02:46:24,954 INFO L226 Difference]: Without dead ends: 83 [2022-02-24 02:46:24,955 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4202 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=484, Invalid=13322, Unknown=0, NotChecked=0, Total=13806 [2022-02-24 02:46:24,955 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 87 mSDsluCounter, 192 mSDsCounter, 0 mSdLazyCounter, 2852 mSolverCounterSat, 50 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 202 SdHoareTripleChecker+Invalid, 2902 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 50 IncrementalHoareTripleChecker+Valid, 2852 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-02-24 02:46:24,956 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [87 Valid, 202 Invalid, 2902 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [50 Valid, 2852 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-02-24 02:46:24,956 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2022-02-24 02:46:24,961 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 82. [2022-02-24 02:46:24,961 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 77 states have (on average 1.025974025974026) internal successors, (79), 77 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) [2022-02-24 02:46:24,962 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 83 transitions. [2022-02-24 02:46:24,962 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 83 transitions. Word has length 77 [2022-02-24 02:46:24,962 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 02:46:24,962 INFO L470 AbstractCegarLoop]: Abstraction has 82 states and 83 transitions. [2022-02-24 02:46:24,962 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 61 states, 60 states have (on average 1.2166666666666666) internal successors, (73), 59 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) [2022-02-24 02:46:24,962 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 83 transitions. [2022-02-24 02:46:24,962 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2022-02-24 02:46:24,962 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 02:46:24,962 INFO L514 BasicCegarLoop]: trace histogram [23, 23, 14, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 02:46:24,962 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2022-02-24 02:46:24,963 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 02:46:24,963 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 02:46:24,963 INFO L85 PathProgramCache]: Analyzing trace with hash -43004887, now seen corresponding path program 14 times [2022-02-24 02:46:24,963 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 02:46:24,963 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [42885895] [2022-02-24 02:46:24,963 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 02:46:24,964 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 02:46:25,124 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:46:25,264 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:46:25,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:46:25,329 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 02:46:25,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:46:25,332 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 02:46:27,619 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 02:46:27,619 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [42885895] [2022-02-24 02:46:27,619 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [42885895] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 02:46:27,620 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 02:46:27,620 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [63] imperfect sequences [] total 63 [2022-02-24 02:46:27,620 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1028222057] [2022-02-24 02:46:27,620 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 02:46:27,620 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 63 states [2022-02-24 02:46:27,620 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 02:46:27,620 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2022-02-24 02:46:27,621 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=3859, Unknown=0, NotChecked=0, Total=4032 [2022-02-24 02:46:27,621 INFO L87 Difference]: Start difference. First operand 82 states and 83 transitions. Second operand has 63 states, 62 states have (on average 1.2258064516129032) internal successors, (76), 61 states have internal predecessors, (76), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:46:31,080 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 02:46:31,080 INFO L93 Difference]: Finished difference Result 94 states and 98 transitions. [2022-02-24 02:46:31,081 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2022-02-24 02:46:31,081 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 62 states have (on average 1.2258064516129032) internal successors, (76), 61 states have internal predecessors, (76), 2 states have call successors, (3), 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 80 [2022-02-24 02:46:31,081 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 02:46:31,081 INFO L225 Difference]: With dead ends: 94 [2022-02-24 02:46:31,082 INFO L226 Difference]: Without dead ends: 86 [2022-02-24 02:46:31,083 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 17 SyntacticMatches, 3 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4445 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=491, Invalid=14029, Unknown=0, NotChecked=0, Total=14520 [2022-02-24 02:46:31,083 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 90 mSDsluCounter, 217 mSDsCounter, 0 mSdLazyCounter, 3346 mSolverCounterSat, 53 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 90 SdHoareTripleChecker+Valid, 227 SdHoareTripleChecker+Invalid, 3399 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 3346 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-02-24 02:46:31,083 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [90 Valid, 227 Invalid, 3399 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [53 Valid, 3346 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-02-24 02:46:31,083 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2022-02-24 02:46:31,089 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2022-02-24 02:46:31,089 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 80 states have (on average 1.025) internal successors, (82), 80 states have internal predecessors, (82), 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) [2022-02-24 02:46:31,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 86 transitions. [2022-02-24 02:46:31,090 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 86 transitions. Word has length 80 [2022-02-24 02:46:31,090 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 02:46:31,090 INFO L470 AbstractCegarLoop]: Abstraction has 85 states and 86 transitions. [2022-02-24 02:46:31,090 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 63 states, 62 states have (on average 1.2258064516129032) internal successors, (76), 61 states have internal predecessors, (76), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:46:31,090 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 86 transitions. [2022-02-24 02:46:31,090 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2022-02-24 02:46:31,090 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 02:46:31,090 INFO L514 BasicCegarLoop]: trace histogram [24, 24, 15, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 02:46:31,091 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2022-02-24 02:46:31,091 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 02:46:31,091 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 02:46:31,091 INFO L85 PathProgramCache]: Analyzing trace with hash 2066084366, now seen corresponding path program 15 times [2022-02-24 02:46:31,091 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 02:46:31,091 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1081737248] [2022-02-24 02:46:31,091 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 02:46:31,092 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 02:46:31,201 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:46:31,308 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:46:31,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:46:31,397 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 02:46:31,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:46:31,400 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 02:46:34,177 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 02:46:34,177 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1081737248] [2022-02-24 02:46:34,177 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1081737248] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 02:46:34,177 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 02:46:34,177 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [65] imperfect sequences [] total 65 [2022-02-24 02:46:34,177 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1882938080] [2022-02-24 02:46:34,177 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 02:46:34,178 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 65 states [2022-02-24 02:46:34,178 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 02:46:34,178 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2022-02-24 02:46:34,178 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=4238, Unknown=0, NotChecked=0, Total=4422 [2022-02-24 02:46:34,178 INFO L87 Difference]: Start difference. First operand 85 states and 86 transitions. Second operand has 65 states, 64 states have (on average 1.234375) internal successors, (79), 63 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) [2022-02-24 02:46:38,047 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 02:46:38,048 INFO L93 Difference]: Finished difference Result 97 states and 101 transitions. [2022-02-24 02:46:38,048 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2022-02-24 02:46:38,048 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 64 states have (on average 1.234375) internal successors, (79), 63 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 [2022-02-24 02:46:38,049 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 02:46:38,049 INFO L225 Difference]: With dead ends: 97 [2022-02-24 02:46:38,049 INFO L226 Difference]: Without dead ends: 89 [2022-02-24 02:46:38,050 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 18 SyntacticMatches, 2 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4820 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=514, Invalid=15236, Unknown=0, NotChecked=0, Total=15750 [2022-02-24 02:46:38,050 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 94 mSDsluCounter, 192 mSDsCounter, 0 mSdLazyCounter, 3086 mSolverCounterSat, 53 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 94 SdHoareTripleChecker+Valid, 202 SdHoareTripleChecker+Invalid, 3139 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 3086 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-02-24 02:46:38,050 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [94 Valid, 202 Invalid, 3139 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [53 Valid, 3086 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-02-24 02:46:38,050 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2022-02-24 02:46:38,056 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 88. [2022-02-24 02:46:38,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 83 states have (on average 1.0240963855421688) internal successors, (85), 83 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) [2022-02-24 02:46:38,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 89 transitions. [2022-02-24 02:46:38,057 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 89 transitions. Word has length 83 [2022-02-24 02:46:38,057 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 02:46:38,057 INFO L470 AbstractCegarLoop]: Abstraction has 88 states and 89 transitions. [2022-02-24 02:46:38,057 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 65 states, 64 states have (on average 1.234375) internal successors, (79), 63 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) [2022-02-24 02:46:38,057 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 89 transitions. [2022-02-24 02:46:38,057 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2022-02-24 02:46:38,058 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 02:46:38,058 INFO L514 BasicCegarLoop]: trace histogram [25, 25, 16, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 02:46:38,058 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2022-02-24 02:46:38,058 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 02:46:38,058 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 02:46:38,058 INFO L85 PathProgramCache]: Analyzing trace with hash -1427519991, now seen corresponding path program 16 times [2022-02-24 02:46:38,058 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 02:46:38,058 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1323312589] [2022-02-24 02:46:38,058 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 02:46:38,059 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 02:46:38,168 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:46:38,313 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:46:38,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:46:38,405 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 02:46:38,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:46:38,407 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 02:46:40,082 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 02:46:40,082 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1323312589] [2022-02-24 02:46:40,082 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1323312589] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 02:46:40,082 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 02:46:40,082 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [66] imperfect sequences [] total 66 [2022-02-24 02:46:40,083 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1718062975] [2022-02-24 02:46:40,083 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 02:46:40,083 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 66 states [2022-02-24 02:46:40,083 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 02:46:40,083 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2022-02-24 02:46:40,084 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=167, Invalid=4389, Unknown=0, NotChecked=0, Total=4556 [2022-02-24 02:46:40,084 INFO L87 Difference]: Start difference. First operand 88 states and 89 transitions. Second operand has 66 states, 65 states have (on average 1.2615384615384615) internal successors, (82), 64 states have internal predecessors, (82), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:46:42,591 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 02:46:42,591 INFO L93 Difference]: Finished difference Result 100 states and 104 transitions. [2022-02-24 02:46:42,591 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2022-02-24 02:46:42,591 INFO L78 Accepts]: Start accepts. Automaton has has 66 states, 65 states have (on average 1.2615384615384615) internal successors, (82), 64 states have internal predecessors, (82), 2 states have call successors, (3), 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 86 [2022-02-24 02:46:42,592 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 02:46:42,592 INFO L225 Difference]: With dead ends: 100 [2022-02-24 02:46:42,592 INFO L226 Difference]: Without dead ends: 92 [2022-02-24 02:46:42,594 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 20 SyntacticMatches, 2 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4176 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=463, Invalid=15793, Unknown=0, NotChecked=0, Total=16256 [2022-02-24 02:46:42,594 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 98 mSDsluCounter, 242 mSDsCounter, 0 mSdLazyCounter, 4031 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 98 SdHoareTripleChecker+Valid, 252 SdHoareTripleChecker+Invalid, 4070 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 4031 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-02-24 02:46:42,594 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [98 Valid, 252 Invalid, 4070 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 4031 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2022-02-24 02:46:42,595 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2022-02-24 02:46:42,601 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 91. [2022-02-24 02:46:42,601 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 86 states have (on average 1.0232558139534884) internal successors, (88), 86 states have internal predecessors, (88), 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) [2022-02-24 02:46:42,602 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 92 transitions. [2022-02-24 02:46:42,602 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 92 transitions. Word has length 86 [2022-02-24 02:46:42,602 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 02:46:42,602 INFO L470 AbstractCegarLoop]: Abstraction has 91 states and 92 transitions. [2022-02-24 02:46:42,602 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 66 states, 65 states have (on average 1.2615384615384615) internal successors, (82), 64 states have internal predecessors, (82), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:46:42,602 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 92 transitions. [2022-02-24 02:46:42,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2022-02-24 02:46:42,603 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 02:46:42,603 INFO L514 BasicCegarLoop]: trace histogram [26, 26, 17, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 02:46:42,603 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2022-02-24 02:46:42,603 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 02:46:42,603 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 02:46:42,603 INFO L85 PathProgramCache]: Analyzing trace with hash 547564590, now seen corresponding path program 17 times [2022-02-24 02:46:42,603 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 02:46:42,603 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [105639215] [2022-02-24 02:46:42,603 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 02:46:42,604 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 02:46:42,772 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:46:42,912 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:46:42,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:46:43,020 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 02:46:43,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:46:43,040 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 02:46:44,810 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 02:46:44,810 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [105639215] [2022-02-24 02:46:44,810 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [105639215] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 02:46:44,810 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 02:46:44,810 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [68] imperfect sequences [] total 68 [2022-02-24 02:46:44,810 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [145197301] [2022-02-24 02:46:44,810 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 02:46:44,811 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 68 states [2022-02-24 02:46:44,811 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 02:46:44,811 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2022-02-24 02:46:44,812 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=172, Invalid=4658, Unknown=0, NotChecked=0, Total=4830 [2022-02-24 02:46:44,812 INFO L87 Difference]: Start difference. First operand 91 states and 92 transitions. Second operand has 68 states, 67 states have (on average 1.2686567164179106) internal successors, (85), 66 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) [2022-02-24 02:46:47,656 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 02:46:47,656 INFO L93 Difference]: Finished difference Result 103 states and 107 transitions. [2022-02-24 02:46:47,657 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2022-02-24 02:46:47,657 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 67 states have (on average 1.2686567164179106) internal successors, (85), 66 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 [2022-02-24 02:46:47,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 02:46:47,658 INFO L225 Difference]: With dead ends: 103 [2022-02-24 02:46:47,658 INFO L226 Difference]: Without dead ends: 95 [2022-02-24 02:46:47,659 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 130 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4464 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=478, Invalid=16814, Unknown=0, NotChecked=0, Total=17292 [2022-02-24 02:46:47,660 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 101 mSDsluCounter, 267 mSDsCounter, 0 mSdLazyCounter, 4601 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 101 SdHoareTripleChecker+Valid, 277 SdHoareTripleChecker+Invalid, 4641 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 4601 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-02-24 02:46:47,660 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [101 Valid, 277 Invalid, 4641 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 4601 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2022-02-24 02:46:47,660 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2022-02-24 02:46:47,671 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 94. [2022-02-24 02:46:47,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 89 states have (on average 1.0224719101123596) internal successors, (91), 89 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) [2022-02-24 02:46:47,671 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 95 transitions. [2022-02-24 02:46:47,672 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 95 transitions. Word has length 89 [2022-02-24 02:46:47,672 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 02:46:47,672 INFO L470 AbstractCegarLoop]: Abstraction has 94 states and 95 transitions. [2022-02-24 02:46:47,672 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 68 states, 67 states have (on average 1.2686567164179106) internal successors, (85), 66 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) [2022-02-24 02:46:47,672 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 95 transitions. [2022-02-24 02:46:47,672 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2022-02-24 02:46:47,672 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 02:46:47,672 INFO L514 BasicCegarLoop]: trace histogram [27, 27, 18, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 02:46:47,672 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2022-02-24 02:46:47,673 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 02:46:47,673 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 02:46:47,673 INFO L85 PathProgramCache]: Analyzing trace with hash -759638039, now seen corresponding path program 18 times [2022-02-24 02:46:47,673 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 02:46:47,673 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1292685663] [2022-02-24 02:46:47,673 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 02:46:47,674 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 02:46:47,821 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:46:47,968 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:46:47,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:46:48,041 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 02:46:48,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:46:48,044 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 02:46:49,971 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 02:46:49,972 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1292685663] [2022-02-24 02:46:49,972 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1292685663] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 02:46:49,972 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 02:46:49,972 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [70] imperfect sequences [] total 70 [2022-02-24 02:46:49,972 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1771740372] [2022-02-24 02:46:49,972 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 02:46:49,972 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 70 states [2022-02-24 02:46:49,972 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 02:46:49,972 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2022-02-24 02:46:49,973 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=4935, Unknown=0, NotChecked=0, Total=5112 [2022-02-24 02:46:49,973 INFO L87 Difference]: Start difference. First operand 94 states and 95 transitions. Second operand has 70 states, 69 states have (on average 1.2753623188405796) internal successors, (88), 68 states have internal predecessors, (88), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:46:52,813 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 02:46:52,813 INFO L93 Difference]: Finished difference Result 106 states and 110 transitions. [2022-02-24 02:46:52,813 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2022-02-24 02:46:52,814 INFO L78 Accepts]: Start accepts. Automaton has has 70 states, 69 states have (on average 1.2753623188405796) internal successors, (88), 68 states have internal predecessors, (88), 2 states have call successors, (3), 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 92 [2022-02-24 02:46:52,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 02:46:52,814 INFO L225 Difference]: With dead ends: 106 [2022-02-24 02:46:52,814 INFO L226 Difference]: Without dead ends: 98 [2022-02-24 02:46:52,816 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 22 SyntacticMatches, 2 SemanticMatches, 134 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4768 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=493, Invalid=17867, Unknown=0, NotChecked=0, Total=18360 [2022-02-24 02:46:52,816 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 106 mSDsluCounter, 252 mSDsCounter, 0 mSdLazyCounter, 4502 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 106 SdHoareTripleChecker+Valid, 262 SdHoareTripleChecker+Invalid, 4543 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 4502 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2022-02-24 02:46:52,817 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [106 Valid, 262 Invalid, 4543 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 4502 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2022-02-24 02:46:52,817 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2022-02-24 02:46:52,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 97. [2022-02-24 02:46:52,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 92 states have (on average 1.0217391304347827) internal successors, (94), 92 states have internal predecessors, (94), 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) [2022-02-24 02:46:52,825 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 98 transitions. [2022-02-24 02:46:52,825 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 98 transitions. Word has length 92 [2022-02-24 02:46:52,825 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 02:46:52,825 INFO L470 AbstractCegarLoop]: Abstraction has 97 states and 98 transitions. [2022-02-24 02:46:52,825 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 70 states, 69 states have (on average 1.2753623188405796) internal successors, (88), 68 states have internal predecessors, (88), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:46:52,825 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 98 transitions. [2022-02-24 02:46:52,826 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2022-02-24 02:46:52,826 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 02:46:52,826 INFO L514 BasicCegarLoop]: trace histogram [28, 28, 19, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 02:46:52,826 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2022-02-24 02:46:52,826 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 02:46:52,826 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 02:46:52,826 INFO L85 PathProgramCache]: Analyzing trace with hash -1164685746, now seen corresponding path program 19 times [2022-02-24 02:46:52,826 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 02:46:52,826 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1894624302] [2022-02-24 02:46:52,826 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 02:46:52,827 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 02:46:52,938 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:46:53,082 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:46:53,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:46:53,154 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 02:46:53,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:46:53,159 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 02:46:56,886 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 02:46:56,886 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1894624302] [2022-02-24 02:46:56,886 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1894624302] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 02:46:56,886 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 02:46:56,886 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [73] imperfect sequences [] total 73 [2022-02-24 02:46:56,886 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2018901061] [2022-02-24 02:46:56,886 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 02:46:56,887 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 73 states [2022-02-24 02:46:56,887 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 02:46:56,887 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2022-02-24 02:46:56,888 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=198, Invalid=5204, Unknown=0, NotChecked=0, Total=5402 [2022-02-24 02:46:56,888 INFO L87 Difference]: Start difference. First operand 97 states and 98 transitions. Second operand has 73 states, 72 states have (on average 1.2638888888888888) internal successors, (91), 71 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) [2022-02-24 02:47:02,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 02:47:02,269 INFO L93 Difference]: Finished difference Result 109 states and 113 transitions. [2022-02-24 02:47:02,269 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2022-02-24 02:47:02,269 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 72 states have (on average 1.2638888888888888) internal successors, (91), 71 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 [2022-02-24 02:47:02,270 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 02:47:02,270 INFO L225 Difference]: With dead ends: 109 [2022-02-24 02:47:02,270 INFO L226 Difference]: Without dead ends: 101 [2022-02-24 02:47:02,273 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 22 SyntacticMatches, 3 SemanticMatches, 139 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6105 ImplicationChecksByTransitivity, 7.5s TimeCoverageRelationStatistics Valid=566, Invalid=19174, Unknown=0, NotChecked=0, Total=19740 [2022-02-24 02:47:02,274 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 110 mSDsluCounter, 232 mSDsCounter, 0 mSdLazyCounter, 4282 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 110 SdHoareTripleChecker+Valid, 242 SdHoareTripleChecker+Invalid, 4337 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 4282 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2022-02-24 02:47:02,274 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [110 Valid, 242 Invalid, 4337 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 4282 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2022-02-24 02:47:02,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2022-02-24 02:47:02,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 100. [2022-02-24 02:47:02,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 95 states have (on average 1.0210526315789474) internal successors, (97), 95 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) [2022-02-24 02:47:02,283 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 101 transitions. [2022-02-24 02:47:02,283 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 101 transitions. Word has length 95 [2022-02-24 02:47:02,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 02:47:02,283 INFO L470 AbstractCegarLoop]: Abstraction has 100 states and 101 transitions. [2022-02-24 02:47:02,283 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 73 states, 72 states have (on average 1.2638888888888888) internal successors, (91), 71 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) [2022-02-24 02:47:02,283 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 101 transitions. [2022-02-24 02:47:02,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2022-02-24 02:47:02,283 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 02:47:02,283 INFO L514 BasicCegarLoop]: trace histogram [29, 29, 20, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 02:47:02,284 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2022-02-24 02:47:02,284 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 02:47:02,284 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 02:47:02,284 INFO L85 PathProgramCache]: Analyzing trace with hash 917176777, now seen corresponding path program 20 times [2022-02-24 02:47:02,284 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 02:47:02,284 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1210472778] [2022-02-24 02:47:02,284 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 02:47:02,285 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 02:47:02,432 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:47:02,577 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:47:02,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:47:02,650 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 02:47:02,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:47:02,653 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 02:47:04,729 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 02:47:04,730 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1210472778] [2022-02-24 02:47:04,730 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1210472778] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 02:47:04,730 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 02:47:04,730 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [74] imperfect sequences [] total 74 [2022-02-24 02:47:04,730 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [242069416] [2022-02-24 02:47:04,730 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 02:47:04,730 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 74 states [2022-02-24 02:47:04,730 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 02:47:04,730 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2022-02-24 02:47:04,731 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=181, Invalid=5369, Unknown=0, NotChecked=0, Total=5550 [2022-02-24 02:47:04,731 INFO L87 Difference]: Start difference. First operand 100 states and 101 transitions. Second operand has 74 states, 73 states have (on average 1.2876712328767124) internal successors, (94), 72 states have internal predecessors, (94), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:47:08,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 02:47:08,218 INFO L93 Difference]: Finished difference Result 112 states and 116 transitions. [2022-02-24 02:47:08,218 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2022-02-24 02:47:08,218 INFO L78 Accepts]: Start accepts. Automaton has has 74 states, 73 states have (on average 1.2876712328767124) internal successors, (94), 72 states have internal predecessors, (94), 2 states have call successors, (3), 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 98 [2022-02-24 02:47:08,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 02:47:08,219 INFO L225 Difference]: With dead ends: 112 [2022-02-24 02:47:08,219 INFO L226 Difference]: Without dead ends: 104 [2022-02-24 02:47:08,220 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 141 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5191 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=515, Invalid=19791, Unknown=0, NotChecked=0, Total=20306 [2022-02-24 02:47:08,221 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 114 mSDsluCounter, 292 mSDsCounter, 0 mSdLazyCounter, 5553 mSolverCounterSat, 43 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 114 SdHoareTripleChecker+Valid, 302 SdHoareTripleChecker+Invalid, 5596 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 43 IncrementalHoareTripleChecker+Valid, 5553 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2022-02-24 02:47:08,221 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [114 Valid, 302 Invalid, 5596 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [43 Valid, 5553 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2022-02-24 02:47:08,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2022-02-24 02:47:08,229 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 103. [2022-02-24 02:47:08,229 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 98 states have (on average 1.0204081632653061) internal successors, (100), 98 states have internal predecessors, (100), 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) [2022-02-24 02:47:08,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 104 transitions. [2022-02-24 02:47:08,230 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 104 transitions. Word has length 98 [2022-02-24 02:47:08,230 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 02:47:08,230 INFO L470 AbstractCegarLoop]: Abstraction has 103 states and 104 transitions. [2022-02-24 02:47:08,230 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 74 states, 73 states have (on average 1.2876712328767124) internal successors, (94), 72 states have internal predecessors, (94), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:47:08,230 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 104 transitions. [2022-02-24 02:47:08,230 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2022-02-24 02:47:08,230 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 02:47:08,231 INFO L514 BasicCegarLoop]: trace histogram [30, 30, 21, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 02:47:08,231 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2022-02-24 02:47:08,231 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 02:47:08,231 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 02:47:08,231 INFO L85 PathProgramCache]: Analyzing trace with hash -1939122066, now seen corresponding path program 21 times [2022-02-24 02:47:08,231 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 02:47:08,231 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1193761714] [2022-02-24 02:47:08,231 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 02:47:08,232 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 02:47:08,355 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:47:08,466 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:47:08,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:47:08,544 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 02:47:08,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:47:08,549 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 02:47:10,813 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 02:47:10,813 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1193761714] [2022-02-24 02:47:10,813 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1193761714] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 02:47:10,813 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 02:47:10,813 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [76] imperfect sequences [] total 76 [2022-02-24 02:47:10,813 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [138810776] [2022-02-24 02:47:10,813 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 02:47:10,814 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 76 states [2022-02-24 02:47:10,814 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 02:47:10,814 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2022-02-24 02:47:10,814 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=5814, Unknown=0, NotChecked=0, Total=6006 [2022-02-24 02:47:10,814 INFO L87 Difference]: Start difference. First operand 103 states and 104 transitions. Second operand has 76 states, 75 states have (on average 1.2933333333333332) internal successors, (97), 74 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) [2022-02-24 02:47:14,447 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 02:47:14,447 INFO L93 Difference]: Finished difference Result 115 states and 119 transitions. [2022-02-24 02:47:14,447 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2022-02-24 02:47:14,448 INFO L78 Accepts]: Start accepts. Automaton has has 76 states, 75 states have (on average 1.2933333333333332) internal successors, (97), 74 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 [2022-02-24 02:47:14,448 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 02:47:14,448 INFO L225 Difference]: With dead ends: 115 [2022-02-24 02:47:14,448 INFO L226 Difference]: Without dead ends: 107 [2022-02-24 02:47:14,450 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 26 SyntacticMatches, 1 SemanticMatches, 146 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5728 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=538, Invalid=21218, Unknown=0, NotChecked=0, Total=21756 [2022-02-24 02:47:14,450 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 118 mSDsluCounter, 282 mSDsCounter, 0 mSdLazyCounter, 5540 mSolverCounterSat, 44 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 118 SdHoareTripleChecker+Valid, 292 SdHoareTripleChecker+Invalid, 5584 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 44 IncrementalHoareTripleChecker+Valid, 5540 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2022-02-24 02:47:14,450 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [118 Valid, 292 Invalid, 5584 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [44 Valid, 5540 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2022-02-24 02:47:14,450 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2022-02-24 02:47:14,459 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 106. [2022-02-24 02:47:14,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 101 states have (on average 1.0198019801980198) internal successors, (103), 101 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) [2022-02-24 02:47:14,460 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 107 transitions. [2022-02-24 02:47:14,460 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 107 transitions. Word has length 101 [2022-02-24 02:47:14,460 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 02:47:14,460 INFO L470 AbstractCegarLoop]: Abstraction has 106 states and 107 transitions. [2022-02-24 02:47:14,460 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 76 states, 75 states have (on average 1.2933333333333332) internal successors, (97), 74 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) [2022-02-24 02:47:14,460 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 107 transitions. [2022-02-24 02:47:14,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2022-02-24 02:47:14,461 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 02:47:14,461 INFO L514 BasicCegarLoop]: trace histogram [31, 31, 22, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 02:47:14,461 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2022-02-24 02:47:14,461 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 02:47:14,461 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 02:47:14,461 INFO L85 PathProgramCache]: Analyzing trace with hash -2045885527, now seen corresponding path program 22 times [2022-02-24 02:47:14,461 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 02:47:14,461 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1612573465] [2022-02-24 02:47:14,461 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 02:47:14,462 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 02:47:14,575 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:47:14,730 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:47:14,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:47:14,773 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 02:47:14,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:47:14,776 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 02:47:17,203 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 02:47:17,203 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1612573465] [2022-02-24 02:47:17,203 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1612573465] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 02:47:17,203 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 02:47:17,203 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [78] imperfect sequences [] total 78 [2022-02-24 02:47:17,203 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [361888939] [2022-02-24 02:47:17,204 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 02:47:17,204 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 78 states [2022-02-24 02:47:17,204 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 02:47:17,204 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 78 interpolants. [2022-02-24 02:47:17,205 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=191, Invalid=5971, Unknown=0, NotChecked=0, Total=6162 [2022-02-24 02:47:17,205 INFO L87 Difference]: Start difference. First operand 106 states and 107 transitions. Second operand has 78 states, 77 states have (on average 1.2987012987012987) internal successors, (100), 76 states have internal predecessors, (100), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:47:20,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 02:47:20,773 INFO L93 Difference]: Finished difference Result 118 states and 122 transitions. [2022-02-24 02:47:20,774 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2022-02-24 02:47:20,774 INFO L78 Accepts]: Start accepts. Automaton has has 78 states, 77 states have (on average 1.2987012987012987) internal successors, (100), 76 states have internal predecessors, (100), 2 states have call successors, (3), 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 104 [2022-02-24 02:47:20,774 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 02:47:20,775 INFO L225 Difference]: With dead ends: 118 [2022-02-24 02:47:20,775 INFO L226 Difference]: Without dead ends: 110 [2022-02-24 02:47:20,777 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 26 SyntacticMatches, 2 SemanticMatches, 149 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5853 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=545, Invalid=22105, Unknown=0, NotChecked=0, Total=22650 [2022-02-24 02:47:20,777 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 121 mSDsluCounter, 277 mSDsCounter, 0 mSdLazyCounter, 5612 mSolverCounterSat, 45 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 121 SdHoareTripleChecker+Valid, 287 SdHoareTripleChecker+Invalid, 5657 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 45 IncrementalHoareTripleChecker+Valid, 5612 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2022-02-24 02:47:20,777 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [121 Valid, 287 Invalid, 5657 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [45 Valid, 5612 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2022-02-24 02:47:20,778 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2022-02-24 02:47:20,787 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 109. [2022-02-24 02:47:20,787 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109 states, 104 states have (on average 1.0192307692307692) internal successors, (106), 104 states have internal predecessors, (106), 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) [2022-02-24 02:47:20,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 110 transitions. [2022-02-24 02:47:20,788 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 110 transitions. Word has length 104 [2022-02-24 02:47:20,788 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 02:47:20,788 INFO L470 AbstractCegarLoop]: Abstraction has 109 states and 110 transitions. [2022-02-24 02:47:20,788 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 78 states, 77 states have (on average 1.2987012987012987) internal successors, (100), 76 states have internal predecessors, (100), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:47:20,788 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 110 transitions. [2022-02-24 02:47:20,788 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2022-02-24 02:47:20,788 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 02:47:20,788 INFO L514 BasicCegarLoop]: trace histogram [32, 32, 23, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 02:47:20,789 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2022-02-24 02:47:20,789 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 02:47:20,789 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 02:47:20,789 INFO L85 PathProgramCache]: Analyzing trace with hash -65385842, now seen corresponding path program 23 times [2022-02-24 02:47:20,789 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 02:47:20,789 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1536776790] [2022-02-24 02:47:20,789 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 02:47:20,790 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 02:47:20,939 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:47:21,095 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:47:21,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:47:21,199 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 02:47:21,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:47:21,201 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 02:47:23,712 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 02:47:23,713 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1536776790] [2022-02-24 02:47:23,713 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1536776790] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 02:47:23,713 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 02:47:23,713 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [80] imperfect sequences [] total 80 [2022-02-24 02:47:23,713 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1978342191] [2022-02-24 02:47:23,713 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 02:47:23,713 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 80 states [2022-02-24 02:47:23,713 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 02:47:23,713 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2022-02-24 02:47:23,714 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=202, Invalid=6440, Unknown=0, NotChecked=0, Total=6642 [2022-02-24 02:47:23,714 INFO L87 Difference]: Start difference. First operand 109 states and 110 transitions. Second operand has 80 states, 79 states have (on average 1.3037974683544304) internal successors, (103), 78 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) [2022-02-24 02:47:27,609 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 02:47:27,609 INFO L93 Difference]: Finished difference Result 121 states and 125 transitions. [2022-02-24 02:47:27,609 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2022-02-24 02:47:27,610 INFO L78 Accepts]: Start accepts. Automaton has has 80 states, 79 states have (on average 1.3037974683544304) internal successors, (103), 78 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 [2022-02-24 02:47:27,610 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 02:47:27,610 INFO L225 Difference]: With dead ends: 121 [2022-02-24 02:47:27,610 INFO L226 Difference]: Without dead ends: 113 [2022-02-24 02:47:27,612 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 27 SyntacticMatches, 2 SemanticMatches, 154 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6423 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=568, Invalid=23612, Unknown=0, NotChecked=0, Total=24180 [2022-02-24 02:47:27,612 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 126 mSDsluCounter, 287 mSDsCounter, 0 mSdLazyCounter, 5983 mSolverCounterSat, 46 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 126 SdHoareTripleChecker+Valid, 297 SdHoareTripleChecker+Invalid, 6029 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 46 IncrementalHoareTripleChecker+Valid, 5983 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2022-02-24 02:47:27,612 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [126 Valid, 297 Invalid, 6029 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [46 Valid, 5983 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2022-02-24 02:47:27,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2022-02-24 02:47:27,621 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 112. [2022-02-24 02:47:27,622 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 107 states have (on average 1.0186915887850467) internal successors, (109), 107 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) [2022-02-24 02:47:27,622 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 113 transitions. [2022-02-24 02:47:27,622 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 113 transitions. Word has length 107 [2022-02-24 02:47:27,622 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 02:47:27,622 INFO L470 AbstractCegarLoop]: Abstraction has 112 states and 113 transitions. [2022-02-24 02:47:27,622 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 80 states, 79 states have (on average 1.3037974683544304) internal successors, (103), 78 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) [2022-02-24 02:47:27,622 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 113 transitions. [2022-02-24 02:47:27,623 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2022-02-24 02:47:27,623 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 02:47:27,623 INFO L514 BasicCegarLoop]: trace histogram [33, 33, 24, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 02:47:27,623 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2022-02-24 02:47:27,623 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 02:47:27,623 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 02:47:27,623 INFO L85 PathProgramCache]: Analyzing trace with hash 1034984841, now seen corresponding path program 24 times [2022-02-24 02:47:27,623 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 02:47:27,623 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1279528135] [2022-02-24 02:47:27,623 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 02:47:27,624 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 02:47:27,778 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:47:27,890 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:47:27,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:47:27,944 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 02:47:27,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:47:27,947 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 02:47:30,545 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 02:47:30,546 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1279528135] [2022-02-24 02:47:30,546 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1279528135] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 02:47:30,546 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 02:47:30,546 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [82] imperfect sequences [] total 82 [2022-02-24 02:47:30,546 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [616424613] [2022-02-24 02:47:30,546 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 02:47:30,546 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 82 states [2022-02-24 02:47:30,546 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 02:47:30,546 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 82 interpolants. [2022-02-24 02:47:30,547 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=201, Invalid=6605, Unknown=0, NotChecked=0, Total=6806 [2022-02-24 02:47:30,547 INFO L87 Difference]: Start difference. First operand 112 states and 113 transitions. Second operand has 82 states, 81 states have (on average 1.308641975308642) internal successors, (106), 80 states have internal predecessors, (106), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:47:34,656 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 02:47:34,656 INFO L93 Difference]: Finished difference Result 124 states and 128 transitions. [2022-02-24 02:47:34,657 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2022-02-24 02:47:34,657 INFO L78 Accepts]: Start accepts. Automaton has has 82 states, 81 states have (on average 1.308641975308642) internal successors, (106), 80 states have internal predecessors, (106), 2 states have call successors, (3), 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 110 [2022-02-24 02:47:34,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 02:47:34,658 INFO L225 Difference]: With dead ends: 124 [2022-02-24 02:47:34,658 INFO L226 Difference]: Without dead ends: 116 [2022-02-24 02:47:34,659 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 187 GetRequests, 29 SyntacticMatches, 1 SemanticMatches, 157 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6551 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=575, Invalid=24547, Unknown=0, NotChecked=0, Total=25122 [2022-02-24 02:47:34,659 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 129 mSDsluCounter, 317 mSDsCounter, 0 mSdLazyCounter, 6792 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 129 SdHoareTripleChecker+Valid, 327 SdHoareTripleChecker+Invalid, 6839 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 6792 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2022-02-24 02:47:34,659 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [129 Valid, 327 Invalid, 6839 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 6792 Invalid, 0 Unknown, 0 Unchecked, 2.0s Time] [2022-02-24 02:47:34,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2022-02-24 02:47:34,669 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 115. [2022-02-24 02:47:34,669 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 110 states have (on average 1.018181818181818) internal successors, (112), 110 states have internal predecessors, (112), 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) [2022-02-24 02:47:34,669 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 116 transitions. [2022-02-24 02:47:34,670 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 116 transitions. Word has length 110 [2022-02-24 02:47:34,670 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 02:47:34,670 INFO L470 AbstractCegarLoop]: Abstraction has 115 states and 116 transitions. [2022-02-24 02:47:34,670 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 82 states, 81 states have (on average 1.308641975308642) internal successors, (106), 80 states have internal predecessors, (106), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:47:34,670 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 116 transitions. [2022-02-24 02:47:34,670 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2022-02-24 02:47:34,670 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 02:47:34,670 INFO L514 BasicCegarLoop]: trace histogram [34, 34, 25, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 02:47:34,670 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2022-02-24 02:47:34,671 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 02:47:34,671 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 02:47:34,671 INFO L85 PathProgramCache]: Analyzing trace with hash -1307368274, now seen corresponding path program 25 times [2022-02-24 02:47:34,671 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 02:47:34,671 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [964675253] [2022-02-24 02:47:34,671 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 02:47:34,672 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 02:47:34,825 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:47:34,982 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:47:34,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:47:35,038 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 02:47:35,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:47:35,040 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 02:47:37,701 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 02:47:37,701 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [964675253] [2022-02-24 02:47:37,701 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [964675253] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 02:47:37,701 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 02:47:37,701 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [84] imperfect sequences [] total 84 [2022-02-24 02:47:37,701 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2138961768] [2022-02-24 02:47:37,701 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 02:47:37,701 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 84 states [2022-02-24 02:47:37,701 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 02:47:37,702 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2022-02-24 02:47:37,702 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=206, Invalid=6934, Unknown=0, NotChecked=0, Total=7140 [2022-02-24 02:47:37,702 INFO L87 Difference]: Start difference. First operand 115 states and 116 transitions. Second operand has 84 states, 83 states have (on average 1.3132530120481927) internal successors, (109), 82 states have internal predecessors, (109), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:47:42,186 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 02:47:42,186 INFO L93 Difference]: Finished difference Result 127 states and 131 transitions. [2022-02-24 02:47:42,186 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2022-02-24 02:47:42,187 INFO L78 Accepts]: Start accepts. Automaton has has 84 states, 83 states have (on average 1.3132530120481927) internal successors, (109), 82 states have internal predecessors, (109), 2 states have call successors, (3), 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 113 [2022-02-24 02:47:42,187 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 02:47:42,187 INFO L225 Difference]: With dead ends: 127 [2022-02-24 02:47:42,187 INFO L226 Difference]: Without dead ends: 119 [2022-02-24 02:47:42,189 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 30 SyntacticMatches, 1 SemanticMatches, 161 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6916 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=590, Invalid=25816, Unknown=0, NotChecked=0, Total=26406 [2022-02-24 02:47:42,189 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 133 mSDsluCounter, 332 mSDsCounter, 0 mSdLazyCounter, 7307 mSolverCounterSat, 48 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 133 SdHoareTripleChecker+Valid, 342 SdHoareTripleChecker+Invalid, 7355 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 48 IncrementalHoareTripleChecker+Valid, 7307 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2022-02-24 02:47:42,189 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [133 Valid, 342 Invalid, 7355 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [48 Valid, 7307 Invalid, 0 Unknown, 0 Unchecked, 2.2s Time] [2022-02-24 02:47:42,190 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2022-02-24 02:47:42,200 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 118. [2022-02-24 02:47:42,200 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 113 states have (on average 1.0176991150442478) internal successors, (115), 113 states have internal predecessors, (115), 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) [2022-02-24 02:47:42,200 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 119 transitions. [2022-02-24 02:47:42,200 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 119 transitions. Word has length 113 [2022-02-24 02:47:42,201 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 02:47:42,201 INFO L470 AbstractCegarLoop]: Abstraction has 118 states and 119 transitions. [2022-02-24 02:47:42,201 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 84 states, 83 states have (on average 1.3132530120481927) internal successors, (109), 82 states have internal predecessors, (109), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:47:42,201 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 119 transitions. [2022-02-24 02:47:42,201 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2022-02-24 02:47:42,201 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 02:47:42,201 INFO L514 BasicCegarLoop]: trace histogram [35, 35, 26, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 02:47:42,201 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2022-02-24 02:47:42,201 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 02:47:42,202 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 02:47:42,202 INFO L85 PathProgramCache]: Analyzing trace with hash -2015359127, now seen corresponding path program 26 times [2022-02-24 02:47:42,202 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 02:47:42,202 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [475938775] [2022-02-24 02:47:42,202 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 02:47:42,203 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 02:47:42,319 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:47:42,436 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:47:42,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:47:42,523 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 02:47:42,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:47:42,526 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 02:47:45,393 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 02:47:45,393 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [475938775] [2022-02-24 02:47:45,394 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [475938775] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 02:47:45,394 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 02:47:45,394 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [86] imperfect sequences [] total 86 [2022-02-24 02:47:45,394 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [723179596] [2022-02-24 02:47:45,394 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 02:47:45,394 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 86 states [2022-02-24 02:47:45,394 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 02:47:45,394 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2022-02-24 02:47:45,395 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=217, Invalid=7439, Unknown=0, NotChecked=0, Total=7656 [2022-02-24 02:47:45,395 INFO L87 Difference]: Start difference. First operand 118 states and 119 transitions. Second operand has 86 states, 85 states have (on average 1.3176470588235294) internal successors, (112), 84 states have internal predecessors, (112), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:47:49,721 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 02:47:49,722 INFO L93 Difference]: Finished difference Result 130 states and 134 transitions. [2022-02-24 02:47:49,723 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2022-02-24 02:47:49,723 INFO L78 Accepts]: Start accepts. Automaton has has 86 states, 85 states have (on average 1.3176470588235294) internal successors, (112), 84 states have internal predecessors, (112), 2 states have call successors, (3), 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 116 [2022-02-24 02:47:49,723 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 02:47:49,723 INFO L225 Difference]: With dead ends: 130 [2022-02-24 02:47:49,723 INFO L226 Difference]: Without dead ends: 122 [2022-02-24 02:47:49,725 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 198 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 166 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7533 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=613, Invalid=27443, Unknown=0, NotChecked=0, Total=28056 [2022-02-24 02:47:49,725 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 137 mSDsluCounter, 307 mSDsCounter, 0 mSdLazyCounter, 6955 mSolverCounterSat, 49 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 137 SdHoareTripleChecker+Valid, 317 SdHoareTripleChecker+Invalid, 7004 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 49 IncrementalHoareTripleChecker+Valid, 6955 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2022-02-24 02:47:49,726 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [137 Valid, 317 Invalid, 7004 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [49 Valid, 6955 Invalid, 0 Unknown, 0 Unchecked, 2.1s Time] [2022-02-24 02:47:49,726 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2022-02-24 02:47:49,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 121. [2022-02-24 02:47:49,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 121 states, 116 states have (on average 1.0172413793103448) internal successors, (118), 116 states have internal predecessors, (118), 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) [2022-02-24 02:47:49,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 122 transitions. [2022-02-24 02:47:49,738 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 122 transitions. Word has length 116 [2022-02-24 02:47:49,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 02:47:49,738 INFO L470 AbstractCegarLoop]: Abstraction has 121 states and 122 transitions. [2022-02-24 02:47:49,738 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 86 states, 85 states have (on average 1.3176470588235294) internal successors, (112), 84 states have internal predecessors, (112), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:47:49,738 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 122 transitions. [2022-02-24 02:47:49,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2022-02-24 02:47:49,739 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 02:47:49,739 INFO L514 BasicCegarLoop]: trace histogram [36, 36, 27, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 02:47:49,739 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2022-02-24 02:47:49,739 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 02:47:49,739 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 02:47:49,739 INFO L85 PathProgramCache]: Analyzing trace with hash -1186470194, now seen corresponding path program 27 times [2022-02-24 02:47:49,739 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 02:47:49,739 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1076938009] [2022-02-24 02:47:49,740 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 02:47:49,740 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 02:47:49,909 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:47:50,023 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:47:50,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:47:50,121 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 02:47:50,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:47:50,124 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 02:47:53,099 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 02:47:53,099 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1076938009] [2022-02-24 02:47:53,099 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1076938009] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 02:47:53,099 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 02:47:53,099 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [88] imperfect sequences [] total 88 [2022-02-24 02:47:53,099 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [768321076] [2022-02-24 02:47:53,099 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 02:47:53,101 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 88 states [2022-02-24 02:47:53,101 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 02:47:53,101 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 88 interpolants. [2022-02-24 02:47:53,103 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=7788, Unknown=0, NotChecked=0, Total=8010 [2022-02-24 02:47:53,103 INFO L87 Difference]: Start difference. First operand 121 states and 122 transitions. Second operand has 88 states, 87 states have (on average 1.3218390804597702) internal successors, (115), 86 states have internal predecessors, (115), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:47:57,930 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 02:47:57,930 INFO L93 Difference]: Finished difference Result 133 states and 137 transitions. [2022-02-24 02:47:57,931 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2022-02-24 02:47:57,931 INFO L78 Accepts]: Start accepts. Automaton has has 88 states, 87 states have (on average 1.3218390804597702) internal successors, (115), 86 states have internal predecessors, (115), 2 states have call successors, (3), 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 119 [2022-02-24 02:47:57,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 02:47:57,932 INFO L225 Difference]: With dead ends: 133 [2022-02-24 02:47:57,932 INFO L226 Difference]: Without dead ends: 125 [2022-02-24 02:47:57,933 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 203 GetRequests, 32 SyntacticMatches, 1 SemanticMatches, 170 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7924 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=628, Invalid=28784, Unknown=0, NotChecked=0, Total=29412 [2022-02-24 02:47:57,934 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 141 mSDsluCounter, 332 mSDsCounter, 0 mSdLazyCounter, 7711 mSolverCounterSat, 50 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 141 SdHoareTripleChecker+Valid, 342 SdHoareTripleChecker+Invalid, 7761 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 50 IncrementalHoareTripleChecker+Valid, 7711 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2022-02-24 02:47:57,934 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [141 Valid, 342 Invalid, 7761 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [50 Valid, 7711 Invalid, 0 Unknown, 0 Unchecked, 2.4s Time] [2022-02-24 02:47:57,934 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2022-02-24 02:47:57,945 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 124. [2022-02-24 02:47:57,945 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 119 states have (on average 1.0168067226890756) internal successors, (121), 119 states have internal predecessors, (121), 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) [2022-02-24 02:47:57,946 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 125 transitions. [2022-02-24 02:47:57,946 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 125 transitions. Word has length 119 [2022-02-24 02:47:57,946 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 02:47:57,946 INFO L470 AbstractCegarLoop]: Abstraction has 124 states and 125 transitions. [2022-02-24 02:47:57,946 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 88 states, 87 states have (on average 1.3218390804597702) internal successors, (115), 86 states have internal predecessors, (115), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:47:57,946 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 125 transitions. [2022-02-24 02:47:57,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2022-02-24 02:47:57,946 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 02:47:57,946 INFO L514 BasicCegarLoop]: trace histogram [37, 37, 28, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 02:47:57,947 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2022-02-24 02:47:57,947 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 02:47:57,947 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 02:47:57,947 INFO L85 PathProgramCache]: Analyzing trace with hash 476748105, now seen corresponding path program 28 times [2022-02-24 02:47:57,947 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 02:47:57,947 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [640044093] [2022-02-24 02:47:57,947 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 02:47:57,948 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 02:47:58,104 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:47:58,259 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:47:58,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:47:58,343 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 02:47:58,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:47:58,352 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 02:48:01,378 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 02:48:01,378 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [640044093] [2022-02-24 02:48:01,378 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [640044093] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 02:48:01,378 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 02:48:01,378 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [90] imperfect sequences [] total 90 [2022-02-24 02:48:01,378 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1452540641] [2022-02-24 02:48:01,378 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 02:48:01,380 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 90 states [2022-02-24 02:48:01,380 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 02:48:01,380 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 90 interpolants. [2022-02-24 02:48:01,381 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=227, Invalid=8145, Unknown=0, NotChecked=0, Total=8372 [2022-02-24 02:48:01,381 INFO L87 Difference]: Start difference. First operand 124 states and 125 transitions. Second operand has 90 states, 89 states have (on average 1.3258426966292134) internal successors, (118), 88 states have internal predecessors, (118), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:48:06,318 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 02:48:06,318 INFO L93 Difference]: Finished difference Result 136 states and 140 transitions. [2022-02-24 02:48:06,318 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 87 states. [2022-02-24 02:48:06,319 INFO L78 Accepts]: Start accepts. Automaton has has 90 states, 89 states have (on average 1.3258426966292134) internal successors, (118), 88 states have internal predecessors, (118), 2 states have call successors, (3), 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 122 [2022-02-24 02:48:06,319 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 02:48:06,319 INFO L225 Difference]: With dead ends: 136 [2022-02-24 02:48:06,319 INFO L226 Difference]: Without dead ends: 128 [2022-02-24 02:48:06,321 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 208 GetRequests, 32 SyntacticMatches, 2 SemanticMatches, 174 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8328 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=643, Invalid=30157, Unknown=0, NotChecked=0, Total=30800 [2022-02-24 02:48:06,322 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 146 mSDsluCounter, 327 mSDsCounter, 0 mSdLazyCounter, 7796 mSolverCounterSat, 51 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 146 SdHoareTripleChecker+Valid, 337 SdHoareTripleChecker+Invalid, 7847 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 7796 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2022-02-24 02:48:06,322 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [146 Valid, 337 Invalid, 7847 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 7796 Invalid, 0 Unknown, 0 Unchecked, 2.5s Time] [2022-02-24 02:48:06,322 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2022-02-24 02:48:06,351 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 127. [2022-02-24 02:48:06,352 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 122 states have (on average 1.0163934426229508) internal successors, (124), 122 states have internal predecessors, (124), 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) [2022-02-24 02:48:06,352 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 128 transitions. [2022-02-24 02:48:06,352 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 128 transitions. Word has length 122 [2022-02-24 02:48:06,352 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 02:48:06,352 INFO L470 AbstractCegarLoop]: Abstraction has 127 states and 128 transitions. [2022-02-24 02:48:06,353 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 90 states, 89 states have (on average 1.3258426966292134) internal successors, (118), 88 states have internal predecessors, (118), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:48:06,353 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 128 transitions. [2022-02-24 02:48:06,353 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2022-02-24 02:48:06,353 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 02:48:06,353 INFO L514 BasicCegarLoop]: trace histogram [38, 38, 29, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 02:48:06,353 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2022-02-24 02:48:06,353 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 02:48:06,353 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 02:48:06,353 INFO L85 PathProgramCache]: Analyzing trace with hash -1624600338, now seen corresponding path program 29 times [2022-02-24 02:48:06,354 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 02:48:06,354 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1990207004] [2022-02-24 02:48:06,354 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 02:48:06,355 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 02:48:06,544 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:48:06,695 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:48:06,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:48:06,756 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 02:48:06,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:48:06,759 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 02:48:09,940 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 02:48:09,940 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1990207004] [2022-02-24 02:48:09,940 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1990207004] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 02:48:09,940 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 02:48:09,940 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [92] imperfect sequences [] total 92 [2022-02-24 02:48:09,940 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [487625438] [2022-02-24 02:48:09,940 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 02:48:09,940 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 92 states [2022-02-24 02:48:09,940 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 02:48:09,941 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 92 interpolants. [2022-02-24 02:48:09,942 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=232, Invalid=8510, Unknown=0, NotChecked=0, Total=8742 [2022-02-24 02:48:09,942 INFO L87 Difference]: Start difference. First operand 127 states and 128 transitions. Second operand has 92 states, 91 states have (on average 1.3296703296703296) internal successors, (121), 90 states have internal predecessors, (121), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:48:15,106 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 02:48:15,106 INFO L93 Difference]: Finished difference Result 139 states and 143 transitions. [2022-02-24 02:48:15,108 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 89 states. [2022-02-24 02:48:15,108 INFO L78 Accepts]: Start accepts. Automaton has has 92 states, 91 states have (on average 1.3296703296703296) internal successors, (121), 90 states have internal predecessors, (121), 2 states have call successors, (3), 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 125 [2022-02-24 02:48:15,108 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 02:48:15,108 INFO L225 Difference]: With dead ends: 139 [2022-02-24 02:48:15,109 INFO L226 Difference]: Without dead ends: 131 [2022-02-24 02:48:15,110 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 213 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 178 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8739 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=658, Invalid=31562, Unknown=0, NotChecked=0, Total=32220 [2022-02-24 02:48:15,110 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 149 mSDsluCounter, 337 mSDsCounter, 0 mSdLazyCounter, 8239 mSolverCounterSat, 52 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 149 SdHoareTripleChecker+Valid, 347 SdHoareTripleChecker+Invalid, 8291 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 52 IncrementalHoareTripleChecker+Valid, 8239 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.6s IncrementalHoareTripleChecker+Time [2022-02-24 02:48:15,110 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [149 Valid, 347 Invalid, 8291 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [52 Valid, 8239 Invalid, 0 Unknown, 0 Unchecked, 2.6s Time] [2022-02-24 02:48:15,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2022-02-24 02:48:15,123 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 130. [2022-02-24 02:48:15,124 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 130 states, 125 states have (on average 1.016) internal successors, (127), 125 states have internal predecessors, (127), 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) [2022-02-24 02:48:15,124 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 131 transitions. [2022-02-24 02:48:15,124 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 131 transitions. Word has length 125 [2022-02-24 02:48:15,124 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 02:48:15,124 INFO L470 AbstractCegarLoop]: Abstraction has 130 states and 131 transitions. [2022-02-24 02:48:15,124 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 92 states, 91 states have (on average 1.3296703296703296) internal successors, (121), 90 states have internal predecessors, (121), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:48:15,124 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 131 transitions. [2022-02-24 02:48:15,125 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2022-02-24 02:48:15,125 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 02:48:15,125 INFO L514 BasicCegarLoop]: trace histogram [39, 39, 30, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 02:48:15,125 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2022-02-24 02:48:15,125 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 02:48:15,125 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 02:48:15,125 INFO L85 PathProgramCache]: Analyzing trace with hash 547240745, now seen corresponding path program 30 times [2022-02-24 02:48:15,125 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 02:48:15,125 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [32232176] [2022-02-24 02:48:15,126 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 02:48:15,126 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 02:48:15,280 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:48:15,431 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:48:15,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:48:15,489 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 02:48:15,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:48:15,499 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 02:48:24,502 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 02:48:24,503 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [32232176] [2022-02-24 02:48:24,503 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [32232176] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 02:48:24,503 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 02:48:24,503 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [95] imperfect sequences [] total 95 [2022-02-24 02:48:24,503 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [995099063] [2022-02-24 02:48:24,503 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 02:48:24,503 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 95 states [2022-02-24 02:48:24,503 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 02:48:24,504 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 95 interpolants. [2022-02-24 02:48:24,504 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=8867, Unknown=0, NotChecked=0, Total=9120 [2022-02-24 02:48:24,504 INFO L87 Difference]: Start difference. First operand 130 states and 131 transitions. Second operand has 95 states, 94 states have (on average 1.3191489361702127) internal successors, (124), 93 states have internal predecessors, (124), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:48:35,560 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 02:48:35,560 INFO L93 Difference]: Finished difference Result 142 states and 146 transitions. [2022-02-24 02:48:35,561 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 92 states. [2022-02-24 02:48:35,561 INFO L78 Accepts]: Start accepts. Automaton has has 95 states, 94 states have (on average 1.3191489361702127) internal successors, (124), 93 states have internal predecessors, (124), 2 states have call successors, (3), 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 128 [2022-02-24 02:48:35,561 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 02:48:35,562 INFO L225 Difference]: With dead ends: 142 [2022-02-24 02:48:35,562 INFO L226 Difference]: Without dead ends: 134 [2022-02-24 02:48:35,564 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 219 GetRequests, 34 SyntacticMatches, 2 SemanticMatches, 183 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10637 ImplicationChecksByTransitivity, 16.9s TimeCoverageRelationStatistics Valid=731, Invalid=33309, Unknown=0, NotChecked=0, Total=34040 [2022-02-24 02:48:35,564 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 154 mSDsluCounter, 302 mSDsCounter, 0 mSdLazyCounter, 7569 mSolverCounterSat, 69 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 154 SdHoareTripleChecker+Valid, 312 SdHoareTripleChecker+Invalid, 7638 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 69 IncrementalHoareTripleChecker+Valid, 7569 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.0s IncrementalHoareTripleChecker+Time [2022-02-24 02:48:35,564 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [154 Valid, 312 Invalid, 7638 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [69 Valid, 7569 Invalid, 0 Unknown, 0 Unchecked, 3.0s Time] [2022-02-24 02:48:35,565 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2022-02-24 02:48:35,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 133. [2022-02-24 02:48:35,578 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 128 states have (on average 1.015625) internal successors, (130), 128 states have internal predecessors, (130), 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) [2022-02-24 02:48:35,578 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 134 transitions. [2022-02-24 02:48:35,578 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 134 transitions. Word has length 128 [2022-02-24 02:48:35,578 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 02:48:35,578 INFO L470 AbstractCegarLoop]: Abstraction has 133 states and 134 transitions. [2022-02-24 02:48:35,578 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 95 states, 94 states have (on average 1.3191489361702127) internal successors, (124), 93 states have internal predecessors, (124), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:48:35,579 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 134 transitions. [2022-02-24 02:48:35,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2022-02-24 02:48:35,579 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 02:48:35,579 INFO L514 BasicCegarLoop]: trace histogram [40, 40, 31, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 02:48:35,579 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2022-02-24 02:48:35,579 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 02:48:35,579 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 02:48:35,579 INFO L85 PathProgramCache]: Analyzing trace with hash -1817369842, now seen corresponding path program 31 times [2022-02-24 02:48:35,580 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 02:48:35,580 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1487096593] [2022-02-24 02:48:35,580 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 02:48:35,581 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 02:48:35,752 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:48:35,906 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:48:35,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:48:35,965 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 02:48:35,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:48:35,967 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 02:48:39,828 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 02:48:39,828 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1487096593] [2022-02-24 02:48:39,829 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1487096593] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 02:48:39,829 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 02:48:39,829 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [96] imperfect sequences [] total 96 [2022-02-24 02:48:39,829 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1780799031] [2022-02-24 02:48:39,829 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 02:48:39,829 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 96 states [2022-02-24 02:48:39,829 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 02:48:39,829 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants. [2022-02-24 02:48:39,830 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=242, Invalid=9264, Unknown=0, NotChecked=0, Total=9506 [2022-02-24 02:48:39,830 INFO L87 Difference]: Start difference. First operand 133 states and 134 transitions. Second operand has 96 states, 95 states have (on average 1.3368421052631578) internal successors, (127), 94 states have internal predecessors, (127), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:48:45,744 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 02:48:45,744 INFO L93 Difference]: Finished difference Result 145 states and 149 transitions. [2022-02-24 02:48:45,745 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 93 states. [2022-02-24 02:48:45,745 INFO L78 Accepts]: Start accepts. Automaton has has 96 states, 95 states have (on average 1.3368421052631578) internal successors, (127), 94 states have internal predecessors, (127), 2 states have call successors, (3), 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 131 [2022-02-24 02:48:45,745 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 02:48:45,746 INFO L225 Difference]: With dead ends: 145 [2022-02-24 02:48:45,746 INFO L226 Difference]: Without dead ends: 137 [2022-02-24 02:48:45,747 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 223 GetRequests, 35 SyntacticMatches, 2 SemanticMatches, 186 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9591 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=688, Invalid=34468, Unknown=0, NotChecked=0, Total=35156 [2022-02-24 02:48:45,747 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 158 mSDsluCounter, 357 mSDsCounter, 0 mSdLazyCounter, 9150 mSolverCounterSat, 54 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 158 SdHoareTripleChecker+Valid, 367 SdHoareTripleChecker+Invalid, 9204 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 54 IncrementalHoareTripleChecker+Valid, 9150 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.1s IncrementalHoareTripleChecker+Time [2022-02-24 02:48:45,748 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [158 Valid, 367 Invalid, 9204 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [54 Valid, 9150 Invalid, 0 Unknown, 0 Unchecked, 3.1s Time] [2022-02-24 02:48:45,748 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2022-02-24 02:48:45,761 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 136. [2022-02-24 02:48:45,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 131 states have (on average 1.015267175572519) internal successors, (133), 131 states have internal predecessors, (133), 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) [2022-02-24 02:48:45,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 137 transitions. [2022-02-24 02:48:45,762 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 137 transitions. Word has length 131 [2022-02-24 02:48:45,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 02:48:45,762 INFO L470 AbstractCegarLoop]: Abstraction has 136 states and 137 transitions. [2022-02-24 02:48:45,762 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 96 states, 95 states have (on average 1.3368421052631578) internal successors, (127), 94 states have internal predecessors, (127), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:48:45,763 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 137 transitions. [2022-02-24 02:48:45,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2022-02-24 02:48:45,763 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 02:48:45,763 INFO L514 BasicCegarLoop]: trace histogram [41, 41, 32, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 02:48:45,763 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2022-02-24 02:48:45,763 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 02:48:45,763 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 02:48:45,763 INFO L85 PathProgramCache]: Analyzing trace with hash 122221833, now seen corresponding path program 32 times [2022-02-24 02:48:45,763 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 02:48:45,764 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [32493590] [2022-02-24 02:48:45,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 02:48:45,765 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 02:48:45,892 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:48:46,058 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:48:46,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:48:46,154 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 02:48:46,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:48:46,157 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 02:48:50,204 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 02:48:50,204 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [32493590] [2022-02-24 02:48:50,205 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [32493590] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 02:48:50,205 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 02:48:50,205 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [98] imperfect sequences [] total 98 [2022-02-24 02:48:50,205 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1700238980] [2022-02-24 02:48:50,205 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 02:48:50,205 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 98 states [2022-02-24 02:48:50,205 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 02:48:50,205 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2022-02-24 02:48:50,206 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=247, Invalid=9653, Unknown=0, NotChecked=0, Total=9900 [2022-02-24 02:48:50,206 INFO L87 Difference]: Start difference. First operand 136 states and 137 transitions. Second operand has 98 states, 97 states have (on average 1.3402061855670102) internal successors, (130), 96 states have internal predecessors, (130), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:48:56,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 02:48:56,348 INFO L93 Difference]: Finished difference Result 148 states and 152 transitions. [2022-02-24 02:48:56,349 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 95 states. [2022-02-24 02:48:56,349 INFO L78 Accepts]: Start accepts. Automaton has has 98 states, 97 states have (on average 1.3402061855670102) internal successors, (130), 96 states have internal predecessors, (130), 2 states have call successors, (3), 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 134 [2022-02-24 02:48:56,350 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 02:48:56,350 INFO L225 Difference]: With dead ends: 148 [2022-02-24 02:48:56,350 INFO L226 Difference]: Without dead ends: 140 [2022-02-24 02:48:56,351 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 228 GetRequests, 36 SyntacticMatches, 2 SemanticMatches, 190 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10032 ImplicationChecksByTransitivity, 6.9s TimeCoverageRelationStatistics Valid=703, Invalid=35969, Unknown=0, NotChecked=0, Total=36672 [2022-02-24 02:48:56,352 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 161 mSDsluCounter, 347 mSDsCounter, 0 mSdLazyCounter, 9109 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 161 SdHoareTripleChecker+Valid, 357 SdHoareTripleChecker+Invalid, 9164 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 9109 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.1s IncrementalHoareTripleChecker+Time [2022-02-24 02:48:56,352 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [161 Valid, 357 Invalid, 9164 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 9109 Invalid, 0 Unknown, 0 Unchecked, 3.1s Time] [2022-02-24 02:48:56,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2022-02-24 02:48:56,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 139. [2022-02-24 02:48:56,366 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 139 states, 134 states have (on average 1.0149253731343284) internal successors, (136), 134 states have internal predecessors, (136), 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) [2022-02-24 02:48:56,367 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 140 transitions. [2022-02-24 02:48:56,367 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 140 transitions. Word has length 134 [2022-02-24 02:48:56,367 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 02:48:56,367 INFO L470 AbstractCegarLoop]: Abstraction has 139 states and 140 transitions. [2022-02-24 02:48:56,367 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 98 states, 97 states have (on average 1.3402061855670102) internal successors, (130), 96 states have internal predecessors, (130), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:48:56,367 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 140 transitions. [2022-02-24 02:48:56,367 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2022-02-24 02:48:56,367 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 02:48:56,368 INFO L514 BasicCegarLoop]: trace histogram [42, 42, 33, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 02:48:56,368 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2022-02-24 02:48:56,368 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 02:48:56,368 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 02:48:56,368 INFO L85 PathProgramCache]: Analyzing trace with hash -1992188626, now seen corresponding path program 33 times [2022-02-24 02:48:56,368 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 02:48:56,368 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1971611246] [2022-02-24 02:48:56,368 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 02:48:56,369 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 02:48:56,526 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:48:56,643 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:48:56,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:48:56,703 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 02:48:56,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:48:56,710 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 02:49:10,206 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 02:49:10,206 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1971611246] [2022-02-24 02:49:10,206 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1971611246] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 02:49:10,206 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 02:49:10,207 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [101] imperfect sequences [] total 101 [2022-02-24 02:49:10,207 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1678605334] [2022-02-24 02:49:10,207 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 02:49:10,207 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 101 states [2022-02-24 02:49:10,207 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 02:49:10,207 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2022-02-24 02:49:10,208 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=274, Invalid=10232, Unknown=0, NotChecked=0, Total=10506 [2022-02-24 02:49:10,208 INFO L87 Difference]: Start difference. First operand 139 states and 140 transitions. Second operand has 101 states, 100 states have (on average 1.33) internal successors, (133), 99 states have internal predecessors, (133), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:49:25,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 02:49:25,369 INFO L93 Difference]: Finished difference Result 151 states and 155 transitions. [2022-02-24 02:49:25,370 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2022-02-24 02:49:25,370 INFO L78 Accepts]: Start accepts. Automaton has has 101 states, 100 states have (on average 1.33) internal successors, (133), 99 states have internal predecessors, (133), 2 states have call successors, (3), 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 137 [2022-02-24 02:49:25,370 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 02:49:25,371 INFO L225 Difference]: With dead ends: 151 [2022-02-24 02:49:25,371 INFO L226 Difference]: Without dead ends: 143 [2022-02-24 02:49:25,373 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 234 GetRequests, 36 SyntacticMatches, 2 SemanticMatches, 196 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12182 ImplicationChecksByTransitivity, 24.8s TimeCoverageRelationStatistics Valid=784, Invalid=38222, Unknown=0, NotChecked=0, Total=39006 [2022-02-24 02:49:25,373 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 166 mSDsluCounter, 307 mSDsCounter, 0 mSdLazyCounter, 8249 mSolverCounterSat, 74 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 166 SdHoareTripleChecker+Valid, 317 SdHoareTripleChecker+Invalid, 8323 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 74 IncrementalHoareTripleChecker+Valid, 8249 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.6s IncrementalHoareTripleChecker+Time [2022-02-24 02:49:25,374 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [166 Valid, 317 Invalid, 8323 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [74 Valid, 8249 Invalid, 0 Unknown, 0 Unchecked, 3.6s Time] [2022-02-24 02:49:25,374 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2022-02-24 02:49:25,405 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 142. [2022-02-24 02:49:25,405 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 142 states, 137 states have (on average 1.0145985401459854) internal successors, (139), 137 states have internal predecessors, (139), 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) [2022-02-24 02:49:25,406 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 143 transitions. [2022-02-24 02:49:25,406 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 143 transitions. Word has length 137 [2022-02-24 02:49:25,406 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 02:49:25,406 INFO L470 AbstractCegarLoop]: Abstraction has 142 states and 143 transitions. [2022-02-24 02:49:25,406 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 101 states, 100 states have (on average 1.33) internal successors, (133), 99 states have internal predecessors, (133), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:49:25,406 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 143 transitions. [2022-02-24 02:49:25,407 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2022-02-24 02:49:25,407 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 02:49:25,407 INFO L514 BasicCegarLoop]: trace histogram [43, 43, 34, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 02:49:25,407 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2022-02-24 02:49:25,407 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 02:49:25,407 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 02:49:25,407 INFO L85 PathProgramCache]: Analyzing trace with hash 1891157737, now seen corresponding path program 34 times [2022-02-24 02:49:25,407 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 02:49:25,408 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [369532930] [2022-02-24 02:49:25,408 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 02:49:25,409 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 02:49:25,591 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:49:25,755 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:49:25,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:49:25,886 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 02:49:25,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:49:25,888 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 02:49:30,558 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 02:49:30,558 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [369532930] [2022-02-24 02:49:30,558 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [369532930] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 02:49:30,558 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 02:49:30,559 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [102] imperfect sequences [] total 102 [2022-02-24 02:49:30,559 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2092990233] [2022-02-24 02:49:30,559 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 02:49:30,559 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 102 states [2022-02-24 02:49:30,559 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 02:49:30,559 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 102 interpolants. [2022-02-24 02:49:30,560 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=257, Invalid=10455, Unknown=0, NotChecked=0, Total=10712 [2022-02-24 02:49:30,560 INFO L87 Difference]: Start difference. First operand 142 states and 143 transitions. Second operand has 102 states, 101 states have (on average 1.3465346534653466) internal successors, (136), 100 states have internal predecessors, (136), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:49:38,098 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 02:49:38,099 INFO L93 Difference]: Finished difference Result 154 states and 158 transitions. [2022-02-24 02:49:38,100 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 99 states. [2022-02-24 02:49:38,100 INFO L78 Accepts]: Start accepts. Automaton has has 102 states, 101 states have (on average 1.3465346534653466) internal successors, (136), 100 states have internal predecessors, (136), 2 states have call successors, (3), 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 140 [2022-02-24 02:49:38,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 02:49:38,100 INFO L225 Difference]: With dead ends: 154 [2022-02-24 02:49:38,101 INFO L226 Difference]: Without dead ends: 146 [2022-02-24 02:49:38,102 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 238 GetRequests, 38 SyntacticMatches, 2 SemanticMatches, 198 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10944 ImplicationChecksByTransitivity, 8.0s TimeCoverageRelationStatistics Valid=733, Invalid=39067, Unknown=0, NotChecked=0, Total=39800 [2022-02-24 02:49:38,102 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 169 mSDsluCounter, 397 mSDsCounter, 0 mSdLazyCounter, 10880 mSolverCounterSat, 57 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 169 SdHoareTripleChecker+Valid, 407 SdHoareTripleChecker+Invalid, 10937 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 57 IncrementalHoareTripleChecker+Valid, 10880 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.0s IncrementalHoareTripleChecker+Time [2022-02-24 02:49:38,102 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [169 Valid, 407 Invalid, 10937 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [57 Valid, 10880 Invalid, 0 Unknown, 0 Unchecked, 4.0s Time] [2022-02-24 02:49:38,103 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2022-02-24 02:49:38,118 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 145. [2022-02-24 02:49:38,118 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 145 states, 140 states have (on average 1.0142857142857142) internal successors, (142), 140 states have internal predecessors, (142), 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) [2022-02-24 02:49:38,119 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 145 states to 145 states and 146 transitions. [2022-02-24 02:49:38,119 INFO L78 Accepts]: Start accepts. Automaton has 145 states and 146 transitions. Word has length 140 [2022-02-24 02:49:38,119 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 02:49:38,119 INFO L470 AbstractCegarLoop]: Abstraction has 145 states and 146 transitions. [2022-02-24 02:49:38,119 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 102 states, 101 states have (on average 1.3465346534653466) internal successors, (136), 100 states have internal predecessors, (136), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:49:38,119 INFO L276 IsEmpty]: Start isEmpty. Operand 145 states and 146 transitions. [2022-02-24 02:49:38,119 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2022-02-24 02:49:38,119 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 02:49:38,120 INFO L514 BasicCegarLoop]: trace histogram [44, 44, 35, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 02:49:38,120 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2022-02-24 02:49:38,120 INFO L402 AbstractCegarLoop]: === Iteration 46 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 02:49:38,120 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 02:49:38,120 INFO L85 PathProgramCache]: Analyzing trace with hash 1423572814, now seen corresponding path program 35 times [2022-02-24 02:49:38,120 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 02:49:38,120 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [154227787] [2022-02-24 02:49:38,120 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 02:49:38,121 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 02:49:38,283 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:49:38,398 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:49:38,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:49:38,451 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 02:49:38,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:49:38,454 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 02:50:00,193 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 02:50:00,193 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [154227787] [2022-02-24 02:50:00,193 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [154227787] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 02:50:00,193 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 02:50:00,194 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [105] imperfect sequences [] total 105 [2022-02-24 02:50:00,194 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1090143055] [2022-02-24 02:50:00,194 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 02:50:00,194 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 105 states [2022-02-24 02:50:00,194 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 02:50:00,194 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 105 interpolants. [2022-02-24 02:50:00,195 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=278, Invalid=10852, Unknown=0, NotChecked=0, Total=11130 [2022-02-24 02:50:00,195 INFO L87 Difference]: Start difference. First operand 145 states and 146 transitions. Second operand has 105 states, 104 states have (on average 1.3365384615384615) internal successors, (139), 103 states have internal predecessors, (139), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:50:23,192 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 02:50:23,192 INFO L93 Difference]: Finished difference Result 157 states and 161 transitions. [2022-02-24 02:50:23,193 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 102 states. [2022-02-24 02:50:23,194 INFO L78 Accepts]: Start accepts. Automaton has has 105 states, 104 states have (on average 1.3365384615384615) internal successors, (139), 103 states have internal predecessors, (139), 2 states have call successors, (3), 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 143 [2022-02-24 02:50:23,194 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 02:50:23,194 INFO L225 Difference]: With dead ends: 157 [2022-02-24 02:50:23,194 INFO L226 Difference]: Without dead ends: 149 [2022-02-24 02:50:23,196 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 243 GetRequests, 38 SyntacticMatches, 2 SemanticMatches, 203 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12900 ImplicationChecksByTransitivity, 39.4s TimeCoverageRelationStatistics Valid=806, Invalid=41014, Unknown=0, NotChecked=0, Total=41820 [2022-02-24 02:50:23,197 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 174 mSDsluCounter, 377 mSDsCounter, 0 mSdLazyCounter, 10553 mSolverCounterSat, 69 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 174 SdHoareTripleChecker+Valid, 387 SdHoareTripleChecker+Invalid, 10622 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 69 IncrementalHoareTripleChecker+Valid, 10553 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.1s IncrementalHoareTripleChecker+Time [2022-02-24 02:50:23,197 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [174 Valid, 387 Invalid, 10622 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [69 Valid, 10553 Invalid, 0 Unknown, 0 Unchecked, 5.1s Time] [2022-02-24 02:50:23,197 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2022-02-24 02:50:23,214 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 148. [2022-02-24 02:50:23,215 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 148 states, 143 states have (on average 1.013986013986014) internal successors, (145), 143 states have internal predecessors, (145), 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) [2022-02-24 02:50:23,215 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 149 transitions. [2022-02-24 02:50:23,215 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 149 transitions. Word has length 143 [2022-02-24 02:50:23,215 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 02:50:23,215 INFO L470 AbstractCegarLoop]: Abstraction has 148 states and 149 transitions. [2022-02-24 02:50:23,216 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 105 states, 104 states have (on average 1.3365384615384615) internal successors, (139), 103 states have internal predecessors, (139), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:50:23,216 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 149 transitions. [2022-02-24 02:50:23,216 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2022-02-24 02:50:23,216 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 02:50:23,216 INFO L514 BasicCegarLoop]: trace histogram [45, 45, 36, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 02:50:23,216 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2022-02-24 02:50:23,216 INFO L402 AbstractCegarLoop]: === Iteration 47 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 02:50:23,217 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 02:50:23,217 INFO L85 PathProgramCache]: Analyzing trace with hash 180072649, now seen corresponding path program 36 times [2022-02-24 02:50:23,217 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 02:50:23,217 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [695181426] [2022-02-24 02:50:23,217 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 02:50:23,218 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 02:50:23,398 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:50:23,579 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:50:23,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:50:23,618 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 02:50:23,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:50:23,621 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 02:50:28,881 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 02:50:28,882 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [695181426] [2022-02-24 02:50:28,884 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [695181426] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 02:50:28,884 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 02:50:28,884 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [106] imperfect sequences [] total 106 [2022-02-24 02:50:28,884 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [407648501] [2022-02-24 02:50:28,884 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 02:50:28,886 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 106 states [2022-02-24 02:50:28,886 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 02:50:28,887 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 106 interpolants. [2022-02-24 02:50:28,887 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=261, Invalid=11081, Unknown=0, NotChecked=0, Total=11342 [2022-02-24 02:50:28,887 INFO L87 Difference]: Start difference. First operand 148 states and 149 transitions. Second operand has 106 states, 105 states have (on average 1.3523809523809525) internal successors, (142), 104 states have internal predecessors, (142), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:50:37,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 02:50:37,549 INFO L93 Difference]: Finished difference Result 160 states and 164 transitions. [2022-02-24 02:50:37,549 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 103 states. [2022-02-24 02:50:37,549 INFO L78 Accepts]: Start accepts. Automaton has has 106 states, 105 states have (on average 1.3523809523809525) internal successors, (142), 104 states have internal predecessors, (142), 2 states have call successors, (3), 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 146 [2022-02-24 02:50:37,549 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 02:50:37,550 INFO L225 Difference]: With dead ends: 160 [2022-02-24 02:50:37,550 INFO L226 Difference]: Without dead ends: 152 [2022-02-24 02:50:37,552 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 247 GetRequests, 40 SyntacticMatches, 2 SemanticMatches, 205 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11593 ImplicationChecksByTransitivity, 9.1s TimeCoverageRelationStatistics Valid=755, Invalid=41887, Unknown=0, NotChecked=0, Total=42642 [2022-02-24 02:50:37,553 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 177 mSDsluCounter, 407 mSDsCounter, 0 mSdLazyCounter, 11646 mSolverCounterSat, 59 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 177 SdHoareTripleChecker+Valid, 417 SdHoareTripleChecker+Invalid, 11705 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 59 IncrementalHoareTripleChecker+Valid, 11646 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.6s IncrementalHoareTripleChecker+Time [2022-02-24 02:50:37,553 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [177 Valid, 417 Invalid, 11705 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [59 Valid, 11646 Invalid, 0 Unknown, 0 Unchecked, 4.6s Time] [2022-02-24 02:50:37,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2022-02-24 02:50:37,569 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 151. [2022-02-24 02:50:37,569 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 151 states, 146 states have (on average 1.0136986301369864) internal successors, (148), 146 states have internal predecessors, (148), 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) [2022-02-24 02:50:37,570 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 152 transitions. [2022-02-24 02:50:37,570 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 152 transitions. Word has length 146 [2022-02-24 02:50:37,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 02:50:37,570 INFO L470 AbstractCegarLoop]: Abstraction has 151 states and 152 transitions. [2022-02-24 02:50:37,570 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 106 states, 105 states have (on average 1.3523809523809525) internal successors, (142), 104 states have internal predecessors, (142), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:50:37,570 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 152 transitions. [2022-02-24 02:50:37,571 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2022-02-24 02:50:37,571 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 02:50:37,571 INFO L514 BasicCegarLoop]: trace histogram [46, 46, 37, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 02:50:37,571 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2022-02-24 02:50:37,571 INFO L402 AbstractCegarLoop]: === Iteration 48 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 02:50:37,571 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 02:50:37,571 INFO L85 PathProgramCache]: Analyzing trace with hash -840414866, now seen corresponding path program 37 times [2022-02-24 02:50:37,571 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 02:50:37,571 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [19436634] [2022-02-24 02:50:37,571 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 02:50:37,572 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 02:50:37,696 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:50:37,868 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:50:37,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:50:37,958 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 02:50:37,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:50:37,964 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 02:50:43,579 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 02:50:43,579 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [19436634] [2022-02-24 02:50:43,579 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [19436634] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 02:50:43,579 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 02:50:43,579 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [108] imperfect sequences [] total 108 [2022-02-24 02:50:43,579 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [822092881] [2022-02-24 02:50:43,579 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 02:50:43,580 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 108 states [2022-02-24 02:50:43,580 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 02:50:43,580 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 108 interpolants. [2022-02-24 02:50:43,581 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=272, Invalid=11718, Unknown=0, NotChecked=0, Total=11990 [2022-02-24 02:50:43,581 INFO L87 Difference]: Start difference. First operand 151 states and 152 transitions. Second operand has 108 states, 107 states have (on average 1.355140186915888) internal successors, (145), 106 states have internal predecessors, (145), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:50:52,391 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 02:50:52,391 INFO L93 Difference]: Finished difference Result 163 states and 167 transitions. [2022-02-24 02:50:52,392 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 105 states. [2022-02-24 02:50:52,392 INFO L78 Accepts]: Start accepts. Automaton has has 108 states, 107 states have (on average 1.355140186915888) internal successors, (145), 106 states have internal predecessors, (145), 2 states have call successors, (3), 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 149 [2022-02-24 02:50:52,393 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 02:50:52,393 INFO L225 Difference]: With dead ends: 163 [2022-02-24 02:50:52,393 INFO L226 Difference]: Without dead ends: 155 [2022-02-24 02:50:52,395 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 253 GetRequests, 41 SyntacticMatches, 2 SemanticMatches, 210 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12387 ImplicationChecksByTransitivity, 9.5s TimeCoverageRelationStatistics Valid=778, Invalid=43954, Unknown=0, NotChecked=0, Total=44732 [2022-02-24 02:50:52,395 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 182 mSDsluCounter, 402 mSDsCounter, 0 mSdLazyCounter, 11747 mSolverCounterSat, 60 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 182 SdHoareTripleChecker+Valid, 412 SdHoareTripleChecker+Invalid, 11807 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 60 IncrementalHoareTripleChecker+Valid, 11747 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.7s IncrementalHoareTripleChecker+Time [2022-02-24 02:50:52,396 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [182 Valid, 412 Invalid, 11807 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [60 Valid, 11747 Invalid, 0 Unknown, 0 Unchecked, 4.7s Time] [2022-02-24 02:50:52,396 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2022-02-24 02:50:52,413 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 154. [2022-02-24 02:50:52,414 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 154 states, 149 states have (on average 1.0134228187919463) internal successors, (151), 149 states have internal predecessors, (151), 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) [2022-02-24 02:50:52,414 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 155 transitions. [2022-02-24 02:50:52,414 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 155 transitions. Word has length 149 [2022-02-24 02:50:52,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 02:50:52,414 INFO L470 AbstractCegarLoop]: Abstraction has 154 states and 155 transitions. [2022-02-24 02:50:52,415 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 108 states, 107 states have (on average 1.355140186915888) internal successors, (145), 106 states have internal predecessors, (145), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:50:52,415 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 155 transitions. [2022-02-24 02:50:52,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2022-02-24 02:50:52,415 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 02:50:52,415 INFO L514 BasicCegarLoop]: trace histogram [47, 47, 38, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 02:50:52,415 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2022-02-24 02:50:52,415 INFO L402 AbstractCegarLoop]: === Iteration 49 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 02:50:52,416 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 02:50:52,416 INFO L85 PathProgramCache]: Analyzing trace with hash 1889514153, now seen corresponding path program 38 times [2022-02-24 02:50:52,416 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 02:50:52,416 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [664872804] [2022-02-24 02:50:52,416 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 02:50:52,416 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 02:50:52,581 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:50:52,702 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:50:52,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:50:52,820 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 02:50:52,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:50:52,831 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 02:51:00,242 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 02:51:00,243 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [664872804] [2022-02-24 02:51:00,243 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [664872804] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 02:51:00,243 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 02:51:00,243 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [110] imperfect sequences [] total 110 [2022-02-24 02:51:00,243 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1404232769] [2022-02-24 02:51:00,243 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 02:51:00,243 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 110 states [2022-02-24 02:51:00,243 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 02:51:00,244 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 110 interpolants. [2022-02-24 02:51:00,244 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=277, Invalid=12155, Unknown=0, NotChecked=0, Total=12432 [2022-02-24 02:51:00,244 INFO L87 Difference]: Start difference. First operand 154 states and 155 transitions. Second operand has 110 states, 109 states have (on average 1.3577981651376148) internal successors, (148), 108 states have internal predecessors, (148), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:51:10,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 02:51:10,156 INFO L93 Difference]: Finished difference Result 166 states and 170 transitions. [2022-02-24 02:51:10,157 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 107 states. [2022-02-24 02:51:10,157 INFO L78 Accepts]: Start accepts. Automaton has has 110 states, 109 states have (on average 1.3577981651376148) internal successors, (148), 108 states have internal predecessors, (148), 2 states have call successors, (3), 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 152 [2022-02-24 02:51:10,157 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 02:51:10,157 INFO L225 Difference]: With dead ends: 166 [2022-02-24 02:51:10,157 INFO L226 Difference]: Without dead ends: 158 [2022-02-24 02:51:10,159 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 258 GetRequests, 42 SyntacticMatches, 2 SemanticMatches, 214 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12888 ImplicationChecksByTransitivity, 12.1s TimeCoverageRelationStatistics Valid=793, Invalid=45647, Unknown=0, NotChecked=0, Total=46440 [2022-02-24 02:51:10,159 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 185 mSDsluCounter, 417 mSDsCounter, 0 mSdLazyCounter, 12432 mSolverCounterSat, 61 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 185 SdHoareTripleChecker+Valid, 427 SdHoareTripleChecker+Invalid, 12493 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 61 IncrementalHoareTripleChecker+Valid, 12432 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.0s IncrementalHoareTripleChecker+Time [2022-02-24 02:51:10,159 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [185 Valid, 427 Invalid, 12493 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [61 Valid, 12432 Invalid, 0 Unknown, 0 Unchecked, 5.0s Time] [2022-02-24 02:51:10,160 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 158 states. [2022-02-24 02:51:10,178 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 158 to 157. [2022-02-24 02:51:10,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 157 states, 152 states have (on average 1.013157894736842) internal successors, (154), 152 states have internal predecessors, (154), 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) [2022-02-24 02:51:10,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 158 transitions. [2022-02-24 02:51:10,178 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 158 transitions. Word has length 152 [2022-02-24 02:51:10,178 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 02:51:10,178 INFO L470 AbstractCegarLoop]: Abstraction has 157 states and 158 transitions. [2022-02-24 02:51:10,179 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 110 states, 109 states have (on average 1.3577981651376148) internal successors, (148), 108 states have internal predecessors, (148), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:51:10,179 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 158 transitions. [2022-02-24 02:51:10,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2022-02-24 02:51:10,179 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 02:51:10,179 INFO L514 BasicCegarLoop]: trace histogram [48, 48, 39, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 02:51:10,179 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48 [2022-02-24 02:51:10,179 INFO L402 AbstractCegarLoop]: === Iteration 50 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 02:51:10,180 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 02:51:10,180 INFO L85 PathProgramCache]: Analyzing trace with hash -295797874, now seen corresponding path program 39 times [2022-02-24 02:51:10,180 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 02:51:10,180 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [529094268] [2022-02-24 02:51:10,180 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 02:51:10,180 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 02:51:10,344 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:51:10,473 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:51:10,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:51:10,525 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 02:51:10,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:51:10,530 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 02:51:16,866 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 02:51:16,866 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [529094268] [2022-02-24 02:51:16,866 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [529094268] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 02:51:16,866 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 02:51:16,866 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [112] imperfect sequences [] total 112 [2022-02-24 02:51:16,867 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [154807801] [2022-02-24 02:51:16,867 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 02:51:16,867 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 112 states [2022-02-24 02:51:16,867 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 02:51:16,867 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 112 interpolants. [2022-02-24 02:51:16,868 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=282, Invalid=12600, Unknown=0, NotChecked=0, Total=12882 [2022-02-24 02:51:16,869 INFO L87 Difference]: Start difference. First operand 157 states and 158 transitions. Second operand has 112 states, 111 states have (on average 1.3603603603603605) internal successors, (151), 110 states have internal predecessors, (151), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:51:26,476 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 02:51:26,476 INFO L93 Difference]: Finished difference Result 169 states and 173 transitions. [2022-02-24 02:51:26,476 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 109 states. [2022-02-24 02:51:26,476 INFO L78 Accepts]: Start accepts. Automaton has has 112 states, 111 states have (on average 1.3603603603603605) internal successors, (151), 110 states have internal predecessors, (151), 2 states have call successors, (3), 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 155 [2022-02-24 02:51:26,476 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 02:51:26,477 INFO L225 Difference]: With dead ends: 169 [2022-02-24 02:51:26,477 INFO L226 Difference]: Without dead ends: 161 [2022-02-24 02:51:26,479 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 263 GetRequests, 44 SyntacticMatches, 1 SemanticMatches, 218 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13396 ImplicationChecksByTransitivity, 10.4s TimeCoverageRelationStatistics Valid=808, Invalid=47372, Unknown=0, NotChecked=0, Total=48180 [2022-02-24 02:51:26,480 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 190 mSDsluCounter, 422 mSDsCounter, 0 mSdLazyCounter, 12835 mSolverCounterSat, 62 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 190 SdHoareTripleChecker+Valid, 432 SdHoareTripleChecker+Invalid, 12897 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 62 IncrementalHoareTripleChecker+Valid, 12835 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.2s IncrementalHoareTripleChecker+Time [2022-02-24 02:51:26,480 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [190 Valid, 432 Invalid, 12897 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [62 Valid, 12835 Invalid, 0 Unknown, 0 Unchecked, 5.2s Time] [2022-02-24 02:51:26,480 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 161 states. [2022-02-24 02:51:26,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 161 to 160. [2022-02-24 02:51:26,499 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 160 states, 155 states have (on average 1.0129032258064516) internal successors, (157), 155 states have internal predecessors, (157), 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) [2022-02-24 02:51:26,499 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 161 transitions. [2022-02-24 02:51:26,499 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 161 transitions. Word has length 155 [2022-02-24 02:51:26,499 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 02:51:26,499 INFO L470 AbstractCegarLoop]: Abstraction has 160 states and 161 transitions. [2022-02-24 02:51:26,499 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 112 states, 111 states have (on average 1.3603603603603605) internal successors, (151), 110 states have internal predecessors, (151), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:51:26,499 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 161 transitions. [2022-02-24 02:51:26,500 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2022-02-24 02:51:26,500 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 02:51:26,500 INFO L514 BasicCegarLoop]: trace histogram [49, 49, 40, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 02:51:26,500 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable49 [2022-02-24 02:51:26,500 INFO L402 AbstractCegarLoop]: === Iteration 51 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 02:51:26,500 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 02:51:26,500 INFO L85 PathProgramCache]: Analyzing trace with hash 187878537, now seen corresponding path program 40 times [2022-02-24 02:51:26,500 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 02:51:26,500 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [24806893] [2022-02-24 02:51:26,500 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 02:51:26,501 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 02:51:26,674 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:51:26,864 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:51:26,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:51:26,921 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 02:51:26,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:51:26,923 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 02:51:32,841 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 02:51:32,842 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [24806893] [2022-02-24 02:51:32,842 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [24806893] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 02:51:32,842 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 02:51:32,842 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [114] imperfect sequences [] total 114 [2022-02-24 02:51:32,842 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1793588224] [2022-02-24 02:51:32,842 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 02:51:32,842 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 114 states [2022-02-24 02:51:32,842 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 02:51:32,843 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 114 interpolants. [2022-02-24 02:51:32,844 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=287, Invalid=13053, Unknown=0, NotChecked=0, Total=13340 [2022-02-24 02:51:32,844 INFO L87 Difference]: Start difference. First operand 160 states and 161 transitions. Second operand has 114 states, 113 states have (on average 1.3628318584070795) internal successors, (154), 112 states have internal predecessors, (154), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:51:43,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 02:51:43,062 INFO L93 Difference]: Finished difference Result 172 states and 176 transitions. [2022-02-24 02:51:43,062 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 111 states. [2022-02-24 02:51:43,063 INFO L78 Accepts]: Start accepts. Automaton has has 114 states, 113 states have (on average 1.3628318584070795) internal successors, (154), 112 states have internal predecessors, (154), 2 states have call successors, (3), 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 158 [2022-02-24 02:51:43,063 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 02:51:43,064 INFO L225 Difference]: With dead ends: 172 [2022-02-24 02:51:43,064 INFO L226 Difference]: Without dead ends: 164 [2022-02-24 02:51:43,066 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 268 GetRequests, 44 SyntacticMatches, 2 SemanticMatches, 222 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13920 ImplicationChecksByTransitivity, 10.4s TimeCoverageRelationStatistics Valid=823, Invalid=49129, Unknown=0, NotChecked=0, Total=49952 [2022-02-24 02:51:43,066 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 194 mSDsluCounter, 432 mSDsCounter, 0 mSdLazyCounter, 13398 mSolverCounterSat, 63 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 194 SdHoareTripleChecker+Valid, 442 SdHoareTripleChecker+Invalid, 13461 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 63 IncrementalHoareTripleChecker+Valid, 13398 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.5s IncrementalHoareTripleChecker+Time [2022-02-24 02:51:43,067 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [194 Valid, 442 Invalid, 13461 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [63 Valid, 13398 Invalid, 0 Unknown, 0 Unchecked, 5.5s Time] [2022-02-24 02:51:43,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2022-02-24 02:51:43,086 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 163. [2022-02-24 02:51:43,086 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 163 states, 158 states have (on average 1.0126582278481013) internal successors, (160), 158 states have internal predecessors, (160), 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) [2022-02-24 02:51:43,087 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 163 states to 163 states and 164 transitions. [2022-02-24 02:51:43,087 INFO L78 Accepts]: Start accepts. Automaton has 163 states and 164 transitions. Word has length 158 [2022-02-24 02:51:43,087 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 02:51:43,087 INFO L470 AbstractCegarLoop]: Abstraction has 163 states and 164 transitions. [2022-02-24 02:51:43,087 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 114 states, 113 states have (on average 1.3628318584070795) internal successors, (154), 112 states have internal predecessors, (154), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:51:43,087 INFO L276 IsEmpty]: Start isEmpty. Operand 163 states and 164 transitions. [2022-02-24 02:51:43,088 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2022-02-24 02:51:43,088 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 02:51:43,088 INFO L514 BasicCegarLoop]: trace histogram [50, 50, 41, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 02:51:43,088 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50 [2022-02-24 02:51:43,088 INFO L402 AbstractCegarLoop]: === Iteration 52 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 02:51:43,088 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 02:51:43,088 INFO L85 PathProgramCache]: Analyzing trace with hash -223439442, now seen corresponding path program 41 times [2022-02-24 02:51:43,088 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 02:51:43,088 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [665609762] [2022-02-24 02:51:43,088 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 02:51:43,089 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 02:51:43,267 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:51:43,449 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:51:43,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:51:43,550 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 02:51:43,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:51:43,559 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 02:51:49,857 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 02:51:49,857 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [665609762] [2022-02-24 02:51:49,857 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [665609762] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 02:51:49,857 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 02:51:49,857 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [116] imperfect sequences [] total 116 [2022-02-24 02:51:49,857 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1213076709] [2022-02-24 02:51:49,857 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 02:51:49,858 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 116 states [2022-02-24 02:51:49,858 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 02:51:49,858 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 116 interpolants. [2022-02-24 02:51:49,859 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=292, Invalid=13514, Unknown=0, NotChecked=0, Total=13806 [2022-02-24 02:51:49,859 INFO L87 Difference]: Start difference. First operand 163 states and 164 transitions. Second operand has 116 states, 115 states have (on average 1.3652173913043477) internal successors, (157), 114 states have internal predecessors, (157), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:52:00,134 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 02:52:00,134 INFO L93 Difference]: Finished difference Result 175 states and 179 transitions. [2022-02-24 02:52:00,134 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 113 states. [2022-02-24 02:52:00,135 INFO L78 Accepts]: Start accepts. Automaton has has 116 states, 115 states have (on average 1.3652173913043477) internal successors, (157), 114 states have internal predecessors, (157), 2 states have call successors, (3), 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 161 [2022-02-24 02:52:00,135 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 02:52:00,135 INFO L225 Difference]: With dead ends: 175 [2022-02-24 02:52:00,136 INFO L226 Difference]: Without dead ends: 167 [2022-02-24 02:52:00,138 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 273 GetRequests, 45 SyntacticMatches, 2 SemanticMatches, 226 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14451 ImplicationChecksByTransitivity, 10.8s TimeCoverageRelationStatistics Valid=838, Invalid=50918, Unknown=0, NotChecked=0, Total=51756 [2022-02-24 02:52:00,139 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 197 mSDsluCounter, 422 mSDsCounter, 0 mSdLazyCounter, 13347 mSolverCounterSat, 64 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 197 SdHoareTripleChecker+Valid, 432 SdHoareTripleChecker+Invalid, 13411 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 64 IncrementalHoareTripleChecker+Valid, 13347 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.5s IncrementalHoareTripleChecker+Time [2022-02-24 02:52:00,139 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [197 Valid, 432 Invalid, 13411 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [64 Valid, 13347 Invalid, 0 Unknown, 0 Unchecked, 5.5s Time] [2022-02-24 02:52:00,139 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2022-02-24 02:52:00,171 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 166. [2022-02-24 02:52:00,171 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 166 states, 161 states have (on average 1.0124223602484472) internal successors, (163), 161 states have internal predecessors, (163), 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) [2022-02-24 02:52:00,171 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 167 transitions. [2022-02-24 02:52:00,171 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 167 transitions. Word has length 161 [2022-02-24 02:52:00,172 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 02:52:00,172 INFO L470 AbstractCegarLoop]: Abstraction has 166 states and 167 transitions. [2022-02-24 02:52:00,172 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 116 states, 115 states have (on average 1.3652173913043477) internal successors, (157), 114 states have internal predecessors, (157), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:52:00,172 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 167 transitions. [2022-02-24 02:52:00,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2022-02-24 02:52:00,172 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 02:52:00,172 INFO L514 BasicCegarLoop]: trace histogram [51, 51, 42, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 02:52:00,172 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51 [2022-02-24 02:52:00,172 INFO L402 AbstractCegarLoop]: === Iteration 53 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 02:52:00,173 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 02:52:00,173 INFO L85 PathProgramCache]: Analyzing trace with hash -255656343, now seen corresponding path program 42 times [2022-02-24 02:52:00,173 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 02:52:00,173 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1432781237] [2022-02-24 02:52:00,173 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 02:52:00,174 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 02:52:00,340 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:52:00,514 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:52:00,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:52:00,708 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 02:52:00,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:52:00,711 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 02:52:10,307 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 02:52:10,307 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1432781237] [2022-02-24 02:52:10,307 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1432781237] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 02:52:10,307 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 02:52:10,307 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [118] imperfect sequences [] total 118 [2022-02-24 02:52:10,307 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [174574880] [2022-02-24 02:52:10,307 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 02:52:10,308 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 118 states [2022-02-24 02:52:10,308 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 02:52:10,308 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 118 interpolants. [2022-02-24 02:52:10,309 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=297, Invalid=13983, Unknown=0, NotChecked=0, Total=14280 [2022-02-24 02:52:10,309 INFO L87 Difference]: Start difference. First operand 166 states and 167 transitions. Second operand has 118 states, 117 states have (on average 1.3675213675213675) internal successors, (160), 116 states have internal predecessors, (160), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:52:22,371 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 02:52:22,371 INFO L93 Difference]: Finished difference Result 178 states and 182 transitions. [2022-02-24 02:52:22,371 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 115 states. [2022-02-24 02:52:22,372 INFO L78 Accepts]: Start accepts. Automaton has has 118 states, 117 states have (on average 1.3675213675213675) internal successors, (160), 116 states have internal predecessors, (160), 2 states have call successors, (3), 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 164 [2022-02-24 02:52:22,372 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 02:52:22,372 INFO L225 Difference]: With dead ends: 178 [2022-02-24 02:52:22,372 INFO L226 Difference]: Without dead ends: 170 [2022-02-24 02:52:22,374 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 278 GetRequests, 46 SyntacticMatches, 2 SemanticMatches, 230 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14992 ImplicationChecksByTransitivity, 15.6s TimeCoverageRelationStatistics Valid=853, Invalid=52739, Unknown=0, NotChecked=0, Total=53592 [2022-02-24 02:52:22,374 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 202 mSDsluCounter, 412 mSDsCounter, 0 mSdLazyCounter, 13284 mSolverCounterSat, 65 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 202 SdHoareTripleChecker+Valid, 422 SdHoareTripleChecker+Invalid, 13349 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 65 IncrementalHoareTripleChecker+Valid, 13284 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.9s IncrementalHoareTripleChecker+Time [2022-02-24 02:52:22,374 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [202 Valid, 422 Invalid, 13349 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [65 Valid, 13284 Invalid, 0 Unknown, 0 Unchecked, 5.9s Time] [2022-02-24 02:52:22,375 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2022-02-24 02:52:22,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 169. [2022-02-24 02:52:22,395 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 169 states, 164 states have (on average 1.0121951219512195) internal successors, (166), 164 states have internal predecessors, (166), 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) [2022-02-24 02:52:22,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 170 transitions. [2022-02-24 02:52:22,396 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 170 transitions. Word has length 164 [2022-02-24 02:52:22,396 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 02:52:22,396 INFO L470 AbstractCegarLoop]: Abstraction has 169 states and 170 transitions. [2022-02-24 02:52:22,396 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 118 states, 117 states have (on average 1.3675213675213675) internal successors, (160), 116 states have internal predecessors, (160), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:52:22,396 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 170 transitions. [2022-02-24 02:52:22,396 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2022-02-24 02:52:22,397 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 02:52:22,397 INFO L514 BasicCegarLoop]: trace histogram [52, 52, 43, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 02:52:22,397 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52 [2022-02-24 02:52:22,397 INFO L402 AbstractCegarLoop]: === Iteration 54 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 02:52:22,397 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 02:52:22,397 INFO L85 PathProgramCache]: Analyzing trace with hash 2043320270, now seen corresponding path program 43 times [2022-02-24 02:52:22,397 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 02:52:22,397 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1333760910] [2022-02-24 02:52:22,397 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 02:52:22,398 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 02:52:22,542 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:52:22,664 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:52:22,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:52:22,712 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 02:52:22,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:52:22,726 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 02:52:29,617 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 02:52:29,617 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1333760910] [2022-02-24 02:52:29,617 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1333760910] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 02:52:29,617 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 02:52:29,617 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [120] imperfect sequences [] total 120 [2022-02-24 02:52:29,617 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1112360355] [2022-02-24 02:52:29,617 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 02:52:29,618 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 120 states [2022-02-24 02:52:29,618 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 02:52:29,618 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 120 interpolants. [2022-02-24 02:52:29,619 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=296, Invalid=14224, Unknown=0, NotChecked=0, Total=14520 [2022-02-24 02:52:29,619 INFO L87 Difference]: Start difference. First operand 169 states and 170 transitions. Second operand has 120 states, 119 states have (on average 1.3697478991596639) internal successors, (163), 118 states have internal predecessors, (163), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:52:41,389 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 02:52:41,390 INFO L93 Difference]: Finished difference Result 181 states and 185 transitions. [2022-02-24 02:52:41,390 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 117 states. [2022-02-24 02:52:41,390 INFO L78 Accepts]: Start accepts. Automaton has has 120 states, 119 states have (on average 1.3697478991596639) internal successors, (163), 118 states have internal predecessors, (163), 2 states have call successors, (3), 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 167 [2022-02-24 02:52:41,390 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 02:52:41,391 INFO L225 Difference]: With dead ends: 181 [2022-02-24 02:52:41,391 INFO L226 Difference]: Without dead ends: 173 [2022-02-24 02:52:41,393 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 282 GetRequests, 47 SyntacticMatches, 2 SemanticMatches, 233 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15198 ImplicationChecksByTransitivity, 11.8s TimeCoverageRelationStatistics Valid=860, Invalid=54130, Unknown=0, NotChecked=0, Total=54990 [2022-02-24 02:52:41,393 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 206 mSDsluCounter, 452 mSDsCounter, 0 mSdLazyCounter, 14831 mSolverCounterSat, 66 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 206 SdHoareTripleChecker+Valid, 462 SdHoareTripleChecker+Invalid, 14897 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 66 IncrementalHoareTripleChecker+Valid, 14831 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.5s IncrementalHoareTripleChecker+Time [2022-02-24 02:52:41,393 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [206 Valid, 462 Invalid, 14897 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [66 Valid, 14831 Invalid, 0 Unknown, 0 Unchecked, 6.5s Time] [2022-02-24 02:52:41,394 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2022-02-24 02:52:41,414 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 172. [2022-02-24 02:52:41,415 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 172 states, 167 states have (on average 1.0119760479041917) internal successors, (169), 167 states have internal predecessors, (169), 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) [2022-02-24 02:52:41,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 173 transitions. [2022-02-24 02:52:41,415 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 173 transitions. Word has length 167 [2022-02-24 02:52:41,415 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 02:52:41,415 INFO L470 AbstractCegarLoop]: Abstraction has 172 states and 173 transitions. [2022-02-24 02:52:41,415 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 120 states, 119 states have (on average 1.3697478991596639) internal successors, (163), 118 states have internal predecessors, (163), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:52:41,415 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 173 transitions. [2022-02-24 02:52:41,416 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 171 [2022-02-24 02:52:41,416 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 02:52:41,416 INFO L514 BasicCegarLoop]: trace histogram [53, 53, 44, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 02:52:41,416 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53 [2022-02-24 02:52:41,416 INFO L402 AbstractCegarLoop]: === Iteration 55 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 02:52:41,416 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 02:52:41,416 INFO L85 PathProgramCache]: Analyzing trace with hash -987871159, now seen corresponding path program 44 times [2022-02-24 02:52:41,416 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 02:52:41,417 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [298154082] [2022-02-24 02:52:41,417 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 02:52:41,417 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 02:52:41,598 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:52:41,729 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:52:41,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:52:41,797 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 02:52:41,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:52:41,799 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 02:53:57,722 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 02:53:57,723 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [298154082] [2022-02-24 02:53:57,723 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [298154082] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 02:53:57,723 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 02:53:57,723 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [123] imperfect sequences [] total 123 [2022-02-24 02:53:57,723 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1182879703] [2022-02-24 02:53:57,723 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 02:53:57,723 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 123 states [2022-02-24 02:53:57,723 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 02:53:57,724 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 123 interpolants. [2022-02-24 02:53:57,725 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=329, Invalid=15171, Unknown=0, NotChecked=0, Total=15500 [2022-02-24 02:53:57,725 INFO L87 Difference]: Start difference. First operand 172 states and 173 transitions. Second operand has 123 states, 122 states have (on average 1.360655737704918) internal successors, (166), 121 states have internal predecessors, (166), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:55:06,758 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 02:55:06,759 INFO L93 Difference]: Finished difference Result 184 states and 188 transitions. [2022-02-24 02:55:06,762 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 120 states. [2022-02-24 02:55:06,763 INFO L78 Accepts]: Start accepts. Automaton has has 123 states, 122 states have (on average 1.360655737704918) internal successors, (166), 121 states have internal predecessors, (166), 2 states have call successors, (3), 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 170 [2022-02-24 02:55:06,763 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 02:55:06,764 INFO L225 Difference]: With dead ends: 184 [2022-02-24 02:55:06,764 INFO L226 Difference]: Without dead ends: 176 [2022-02-24 02:55:06,766 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 289 GetRequests, 47 SyntacticMatches, 2 SemanticMatches, 240 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18276 ImplicationChecksByTransitivity, 132.5s TimeCoverageRelationStatistics Valid=949, Invalid=57373, Unknown=0, NotChecked=0, Total=58322 [2022-02-24 02:55:06,766 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 211 mSDsluCounter, 467 mSDsCounter, 0 mSdLazyCounter, 15588 mSolverCounterSat, 78 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 211 SdHoareTripleChecker+Valid, 477 SdHoareTripleChecker+Invalid, 15666 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 78 IncrementalHoareTripleChecker+Valid, 15588 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 12.0s IncrementalHoareTripleChecker+Time [2022-02-24 02:55:06,767 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [211 Valid, 477 Invalid, 15666 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [78 Valid, 15588 Invalid, 0 Unknown, 0 Unchecked, 12.0s Time] [2022-02-24 02:55:06,771 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 176 states. [2022-02-24 02:55:06,793 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 176 to 175. [2022-02-24 02:55:06,794 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 175 states, 170 states have (on average 1.011764705882353) internal successors, (172), 170 states have internal predecessors, (172), 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) [2022-02-24 02:55:06,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 175 states to 175 states and 176 transitions. [2022-02-24 02:55:06,794 INFO L78 Accepts]: Start accepts. Automaton has 175 states and 176 transitions. Word has length 170 [2022-02-24 02:55:06,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 02:55:06,794 INFO L470 AbstractCegarLoop]: Abstraction has 175 states and 176 transitions. [2022-02-24 02:55:06,794 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 123 states, 122 states have (on average 1.360655737704918) internal successors, (166), 121 states have internal predecessors, (166), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:55:06,794 INFO L276 IsEmpty]: Start isEmpty. Operand 175 states and 176 transitions. [2022-02-24 02:55:06,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2022-02-24 02:55:06,795 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 02:55:06,795 INFO L514 BasicCegarLoop]: trace histogram [54, 54, 45, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 02:55:06,795 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54 [2022-02-24 02:55:06,795 INFO L402 AbstractCegarLoop]: === Iteration 56 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 02:55:06,795 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 02:55:06,796 INFO L85 PathProgramCache]: Analyzing trace with hash -1524334098, now seen corresponding path program 45 times [2022-02-24 02:55:06,796 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 02:55:06,796 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1269574519] [2022-02-24 02:55:06,796 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 02:55:06,796 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 02:55:06,997 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:55:07,185 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:55:07,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:55:07,640 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 02:55:07,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:55:07,642 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 02:55:20,097 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 02:55:20,097 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1269574519] [2022-02-24 02:55:20,097 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1269574519] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 02:55:20,097 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 02:55:20,097 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [124] imperfect sequences [] total 124 [2022-02-24 02:55:20,097 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1553887584] [2022-02-24 02:55:20,097 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 02:55:20,098 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 124 states [2022-02-24 02:55:20,098 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 02:55:20,098 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 124 interpolants. [2022-02-24 02:55:20,099 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=312, Invalid=15438, Unknown=0, NotChecked=0, Total=15750 [2022-02-24 02:55:20,100 INFO L87 Difference]: Start difference. First operand 175 states and 176 transitions. Second operand has 124 states, 123 states have (on average 1.3739837398373984) internal successors, (169), 122 states have internal predecessors, (169), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:55:36,640 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 02:55:36,640 INFO L93 Difference]: Finished difference Result 187 states and 191 transitions. [2022-02-24 02:55:36,640 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 121 states. [2022-02-24 02:55:36,640 INFO L78 Accepts]: Start accepts. Automaton has has 124 states, 123 states have (on average 1.3739837398373984) internal successors, (169), 122 states have internal predecessors, (169), 2 states have call successors, (3), 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 173 [2022-02-24 02:55:36,641 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 02:55:36,641 INFO L225 Difference]: With dead ends: 187 [2022-02-24 02:55:36,641 INFO L226 Difference]: Without dead ends: 179 [2022-02-24 02:55:36,644 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 293 GetRequests, 49 SyntacticMatches, 2 SemanticMatches, 242 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16675 ImplicationChecksByTransitivity, 20.3s TimeCoverageRelationStatistics Valid=898, Invalid=58394, Unknown=0, NotChecked=0, Total=59292 [2022-02-24 02:55:36,644 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 213 mSDsluCounter, 482 mSDsCounter, 0 mSdLazyCounter, 16390 mSolverCounterSat, 68 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 213 SdHoareTripleChecker+Valid, 492 SdHoareTripleChecker+Invalid, 16458 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 68 IncrementalHoareTripleChecker+Valid, 16390 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.6s IncrementalHoareTripleChecker+Time [2022-02-24 02:55:36,644 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [213 Valid, 492 Invalid, 16458 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [68 Valid, 16390 Invalid, 0 Unknown, 0 Unchecked, 8.6s Time] [2022-02-24 02:55:36,645 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2022-02-24 02:55:36,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 178. [2022-02-24 02:55:36,668 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 178 states, 173 states have (on average 1.0115606936416186) internal successors, (175), 173 states have internal predecessors, (175), 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) [2022-02-24 02:55:36,668 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 179 transitions. [2022-02-24 02:55:36,668 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 179 transitions. Word has length 173 [2022-02-24 02:55:36,668 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 02:55:36,668 INFO L470 AbstractCegarLoop]: Abstraction has 178 states and 179 transitions. [2022-02-24 02:55:36,668 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 124 states, 123 states have (on average 1.3739837398373984) internal successors, (169), 122 states have internal predecessors, (169), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:55:36,669 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 179 transitions. [2022-02-24 02:55:36,669 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2022-02-24 02:55:36,669 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 02:55:36,669 INFO L514 BasicCegarLoop]: trace histogram [55, 55, 46, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 02:55:36,669 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable55 [2022-02-24 02:55:36,669 INFO L402 AbstractCegarLoop]: === Iteration 57 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 02:55:36,670 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 02:55:36,670 INFO L85 PathProgramCache]: Analyzing trace with hash -1718441431, now seen corresponding path program 46 times [2022-02-24 02:55:36,670 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 02:55:36,670 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [129506214] [2022-02-24 02:55:36,670 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 02:55:36,670 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 02:55:36,800 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:55:36,980 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:55:36,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:55:37,083 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 02:55:37,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:55:37,086 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 02:55:48,774 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 02:55:48,774 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [129506214] [2022-02-24 02:55:48,774 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [129506214] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 02:55:48,774 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 02:55:48,774 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [126] imperfect sequences [] total 126 [2022-02-24 02:55:48,774 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1065378922] [2022-02-24 02:55:48,774 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 02:55:48,775 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 126 states [2022-02-24 02:55:48,775 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 02:55:48,775 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 126 interpolants. [2022-02-24 02:55:48,776 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=317, Invalid=15939, Unknown=0, NotChecked=0, Total=16256 [2022-02-24 02:55:48,776 INFO L87 Difference]: Start difference. First operand 178 states and 179 transitions. Second operand has 126 states, 125 states have (on average 1.376) internal successors, (172), 124 states have internal predecessors, (172), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:56:05,895 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 02:56:05,895 INFO L93 Difference]: Finished difference Result 190 states and 194 transitions. [2022-02-24 02:56:05,897 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 123 states. [2022-02-24 02:56:05,897 INFO L78 Accepts]: Start accepts. Automaton has has 126 states, 125 states have (on average 1.376) internal successors, (172), 124 states have internal predecessors, (172), 2 states have call successors, (3), 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 176 [2022-02-24 02:56:05,897 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 02:56:05,898 INFO L225 Difference]: With dead ends: 190 [2022-02-24 02:56:05,898 INFO L226 Difference]: Without dead ends: 182 [2022-02-24 02:56:05,901 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 298 GetRequests, 50 SyntacticMatches, 2 SemanticMatches, 246 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17256 ImplicationChecksByTransitivity, 19.1s TimeCoverageRelationStatistics Valid=913, Invalid=60343, Unknown=0, NotChecked=0, Total=61256 [2022-02-24 02:56:05,901 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 218 mSDsluCounter, 467 mSDsCounter, 0 mSdLazyCounter, 16166 mSolverCounterSat, 69 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 218 SdHoareTripleChecker+Valid, 477 SdHoareTripleChecker+Invalid, 16235 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 69 IncrementalHoareTripleChecker+Valid, 16166 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 9.2s IncrementalHoareTripleChecker+Time [2022-02-24 02:56:05,901 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [218 Valid, 477 Invalid, 16235 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [69 Valid, 16166 Invalid, 0 Unknown, 0 Unchecked, 9.2s Time] [2022-02-24 02:56:05,902 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2022-02-24 02:56:05,926 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 181. [2022-02-24 02:56:05,926 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 181 states, 176 states have (on average 1.0113636363636365) internal successors, (178), 176 states have internal predecessors, (178), 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) [2022-02-24 02:56:05,927 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 182 transitions. [2022-02-24 02:56:05,927 INFO L78 Accepts]: Start accepts. Automaton has 181 states and 182 transitions. Word has length 176 [2022-02-24 02:56:05,927 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 02:56:05,927 INFO L470 AbstractCegarLoop]: Abstraction has 181 states and 182 transitions. [2022-02-24 02:56:05,927 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 126 states, 125 states have (on average 1.376) internal successors, (172), 124 states have internal predecessors, (172), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-24 02:56:05,927 INFO L276 IsEmpty]: Start isEmpty. Operand 181 states and 182 transitions. [2022-02-24 02:56:05,928 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 180 [2022-02-24 02:56:05,928 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 02:56:05,928 INFO L514 BasicCegarLoop]: trace histogram [56, 56, 47, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 02:56:05,928 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56 [2022-02-24 02:56:05,928 INFO L402 AbstractCegarLoop]: === Iteration 58 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 02:56:05,928 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 02:56:05,928 INFO L85 PathProgramCache]: Analyzing trace with hash 950948878, now seen corresponding path program 47 times [2022-02-24 02:56:05,928 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 02:56:05,928 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2006908596] [2022-02-24 02:56:05,928 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 02:56:05,929 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 02:56:06,137 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:56:06,377 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 02:56:06,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:56:06,469 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 02:56:06,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 02:56:06,471 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 02:58:22,670 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 02:58:22,670 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2006908596] [2022-02-24 02:58:22,671 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [2006908596] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 02:58:22,671 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 02:58:22,671 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [129] imperfect sequences [] total 129 [2022-02-24 02:58:22,671 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1891211917] [2022-02-24 02:58:22,671 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 02:58:22,671 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 129 states [2022-02-24 02:58:22,671 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 02:58:22,671 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 129 interpolants. [2022-02-24 02:58:22,672 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=338, Invalid=16432, Unknown=0, NotChecked=0, Total=16770 [2022-02-24 02:58:22,672 INFO L87 Difference]: Start difference. First operand 181 states and 182 transitions. Second operand has 129 states, 128 states have (on average 1.3671875) internal successors, (175), 127 states have internal predecessors, (175), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1)