/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationQvasr_64.epf -i ../../../trunk/examples/svcomp/loops-crafted-1/nested_delay_nd.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-05ce600 [2022-02-24 03:51:30,893 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-02-24 03:51:30,894 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-02-24 03:51:30,921 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-02-24 03:51:30,942 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-02-24 03:51:30,942 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-02-24 03:51:30,943 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-02-24 03:51:30,944 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 03:51:30,949 INFO L113 SettingsManager]: Loading preferences was successful [2022-02-24 03:51:30,949 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-02-24 03:51:30,950 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-02-24 03:51:30,950 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-02-24 03:51:30,950 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-02-24 03:51:30,951 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-02-24 03:51:30,951 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-02-24 03:51:30,951 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-02-24 03:51:30,951 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-02-24 03:51:30,951 INFO L138 SettingsManager]: * Use constant arrays=true [2022-02-24 03:51:30,951 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-02-24 03:51:30,951 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-02-24 03:51:30,952 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-02-24 03:51:30,952 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-02-24 03:51:30,952 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-02-24 03:51:30,952 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-02-24 03:51:30,952 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-02-24 03:51:30,952 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2022-02-24 03:51:30,952 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-02-24 03:51:30,953 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=QVASR [2022-02-24 03:51:30,953 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-02-24 03:51:31,121 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-02-24 03:51:31,138 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-02-24 03:51:31,140 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-02-24 03:51:31,142 INFO L271 PluginConnector]: Initializing CDTParser... [2022-02-24 03:51:31,142 INFO L275 PluginConnector]: CDTParser initialized [2022-02-24 03:51:31,143 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/nested_delay_nd.c [2022-02-24 03:51:31,194 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c0cd0c693/26b1f4fef31a4f99be5467784b657b1b/FLAGd907a6e30 [2022-02-24 03:51:31,568 INFO L306 CDTParser]: Found 1 translation units. [2022-02-24 03:51:31,569 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/nested_delay_nd.c [2022-02-24 03:51:31,573 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c0cd0c693/26b1f4fef31a4f99be5467784b657b1b/FLAGd907a6e30 [2022-02-24 03:51:31,582 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c0cd0c693/26b1f4fef31a4f99be5467784b657b1b [2022-02-24 03:51:31,585 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-02-24 03:51:31,586 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-02-24 03:51:31,590 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-02-24 03:51:31,590 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-02-24 03:51:31,593 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-02-24 03:51:31,594 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.02 03:51:31" (1/1) ... [2022-02-24 03:51:31,594 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2fe7d487 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.02 03:51:31, skipping insertion in model container [2022-02-24 03:51:31,594 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.02 03:51:31" (1/1) ... [2022-02-24 03:51:31,598 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-02-24 03:51:31,611 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-02-24 03:51:31,719 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/nested_delay_nd.c[465,478] [2022-02-24 03:51:31,730 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-02-24 03:51:31,735 INFO L203 MainTranslator]: Completed pre-run [2022-02-24 03:51:31,742 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/nested_delay_nd.c[465,478] [2022-02-24 03:51:31,745 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-02-24 03:51:31,753 INFO L208 MainTranslator]: Completed translation [2022-02-24 03:51:31,753 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.02 03:51:31 WrapperNode [2022-02-24 03:51:31,753 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-02-24 03:51:31,754 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-02-24 03:51:31,754 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-02-24 03:51:31,754 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-02-24 03:51:31,760 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.02 03:51:31" (1/1) ... [2022-02-24 03:51:31,760 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.02 03:51:31" (1/1) ... [2022-02-24 03:51:31,764 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.02 03:51:31" (1/1) ... [2022-02-24 03:51:31,764 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.02 03:51:31" (1/1) ... [2022-02-24 03:51:31,766 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.02 03:51:31" (1/1) ... [2022-02-24 03:51:31,769 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.02 03:51:31" (1/1) ... [2022-02-24 03:51:31,769 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.02 03:51:31" (1/1) ... [2022-02-24 03:51:31,770 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-02-24 03:51:31,771 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-02-24 03:51:31,771 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-02-24 03:51:31,771 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-02-24 03:51:31,773 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.02 03:51:31" (1/1) ... [2022-02-24 03:51:31,778 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-02-24 03:51:31,784 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-02-24 03:51:31,793 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 03:51:31,808 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 03:51:31,818 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-02-24 03:51:31,818 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-02-24 03:51:31,818 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-02-24 03:51:31,818 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2022-02-24 03:51:31,818 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-02-24 03:51:31,818 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-02-24 03:51:31,818 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-02-24 03:51:31,818 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-02-24 03:51:31,818 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-02-24 03:51:31,819 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-02-24 03:51:31,819 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2022-02-24 03:51:31,819 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2022-02-24 03:51:31,819 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-02-24 03:51:31,820 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-02-24 03:51:31,820 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-02-24 03:51:31,820 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-02-24 03:51:31,820 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-02-24 03:51:31,821 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-02-24 03:51:31,822 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-02-24 03:51:31,822 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-02-24 03:51:31,866 INFO L234 CfgBuilder]: Building ICFG [2022-02-24 03:51:31,867 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-02-24 03:51:31,961 INFO L275 CfgBuilder]: Performing block encoding [2022-02-24 03:51:31,965 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-02-24 03:51:31,965 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2022-02-24 03:51:31,968 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.02 03:51:31 BoogieIcfgContainer [2022-02-24 03:51:31,968 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-02-24 03:51:31,969 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-02-24 03:51:31,969 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-02-24 03:51:31,975 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-02-24 03:51:31,975 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.02 03:51:31" (1/3) ... [2022-02-24 03:51:31,975 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@506b6420 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.02 03:51:31, skipping insertion in model container [2022-02-24 03:51:31,975 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.02 03:51:31" (2/3) ... [2022-02-24 03:51:31,975 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@506b6420 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.02 03:51:31, skipping insertion in model container [2022-02-24 03:51:31,976 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.02 03:51:31" (3/3) ... [2022-02-24 03:51:31,976 INFO L111 eAbstractionObserver]: Analyzing ICFG nested_delay_nd.c [2022-02-24 03:51:31,979 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-02-24 03:51:31,979 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-02-24 03:51:32,015 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-02-24 03:51:32,020 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 03:51:32,020 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-02-24 03:51:32,029 INFO L276 IsEmpty]: Start isEmpty. Operand has 32 states, 22 states have (on average 1.5454545454545454) internal successors, (34), 24 states have internal predecessors, (34), 4 states have call successors, (4), 4 states have call predecessors, (4), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-02-24 03:51:32,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-02-24 03:51:32,034 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:51:32,034 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:51:32,035 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:51:32,038 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:51:32,038 INFO L85 PathProgramCache]: Analyzing trace with hash -1039138334, now seen corresponding path program 1 times [2022-02-24 03:51:32,043 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:51:32,044 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [365410712] [2022-02-24 03:51:32,044 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:51:32,052 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:51:32,083 INFO L213 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-02-24 03:51:32,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:32,182 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:51:32,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:32,194 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:51:32,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:32,204 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 03:51:32,205 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:51:32,205 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [365410712] [2022-02-24 03:51:32,206 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [365410712] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:51:32,206 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:51:32,207 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-02-24 03:51:32,207 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1689035737] [2022-02-24 03:51:32,208 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:51:32,211 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-02-24 03:51:32,212 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:51:32,232 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-02-24 03:51:32,233 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-02-24 03:51:32,235 INFO L87 Difference]: Start difference. First operand has 32 states, 22 states have (on average 1.5454545454545454) internal successors, (34), 24 states have internal predecessors, (34), 4 states have call successors, (4), 4 states have call predecessors, (4), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Second operand has 3 states, 3 states have (on average 5.0) internal successors, (15), 2 states have internal predecessors, (15), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2022-02-24 03:51:32,315 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:51:32,315 INFO L93 Difference]: Finished difference Result 50 states and 71 transitions. [2022-02-24 03:51:32,316 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-02-24 03:51:32,317 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 2 states have internal predecessors, (15), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 21 [2022-02-24 03:51:32,317 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:51:32,322 INFO L225 Difference]: With dead ends: 50 [2022-02-24 03:51:32,322 INFO L226 Difference]: Without dead ends: 27 [2022-02-24 03:51:32,325 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 6 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 03:51:32,328 INFO L933 BasicCegarLoop]: 33 mSDtfsCounter, 8 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 22 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-02-24 03:51:32,329 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 35 Invalid, 22 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-02-24 03:51:32,339 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2022-02-24 03:51:32,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2022-02-24 03:51:32,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 19 states have (on average 1.368421052631579) internal successors, (26), 20 states have internal predecessors, (26), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-02-24 03:51:32,360 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 33 transitions. [2022-02-24 03:51:32,361 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 33 transitions. Word has length 21 [2022-02-24 03:51:32,361 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:51:32,361 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 33 transitions. [2022-02-24 03:51:32,361 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 2 states have internal predecessors, (15), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2022-02-24 03:51:32,361 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 33 transitions. [2022-02-24 03:51:32,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-02-24 03:51:32,362 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:51:32,363 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:51:32,363 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-02-24 03:51:32,363 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:51:32,365 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:51:32,365 INFO L85 PathProgramCache]: Analyzing trace with hash 677978447, now seen corresponding path program 1 times [2022-02-24 03:51:32,365 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:51:32,365 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [587089082] [2022-02-24 03:51:32,365 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:51:32,369 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:51:32,373 INFO L213 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-02-24 03:51:32,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:32,473 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:51:32,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:32,502 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:51:32,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:32,514 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 03:51:32,514 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:51:32,514 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [587089082] [2022-02-24 03:51:32,515 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [587089082] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:51:32,515 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:51:32,515 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-02-24 03:51:32,515 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1147945976] [2022-02-24 03:51:32,515 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:51:32,515 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-02-24 03:51:32,516 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:51:32,516 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-02-24 03:51:32,516 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-02-24 03:51:32,516 INFO L87 Difference]: Start difference. First operand 27 states and 33 transitions. Second operand has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:32,623 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:51:32,623 INFO L93 Difference]: Finished difference Result 46 states and 60 transitions. [2022-02-24 03:51:32,624 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-02-24 03:51:32,624 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 21 [2022-02-24 03:51:32,624 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:51:32,625 INFO L225 Difference]: With dead ends: 46 [2022-02-24 03:51:32,625 INFO L226 Difference]: Without dead ends: 31 [2022-02-24 03:51:32,628 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2022-02-24 03:51:32,629 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 39 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 60 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 65 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 60 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-02-24 03:51:32,630 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 25 Invalid, 65 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 60 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-02-24 03:51:32,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2022-02-24 03:51:32,638 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2022-02-24 03:51:32,638 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 20 states have (on average 1.35) internal successors, (27), 21 states have internal predecessors, (27), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-02-24 03:51:32,639 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 34 transitions. [2022-02-24 03:51:32,639 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 34 transitions. Word has length 21 [2022-02-24 03:51:32,639 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:51:32,639 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 34 transitions. [2022-02-24 03:51:32,639 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:32,639 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 34 transitions. [2022-02-24 03:51:32,640 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-02-24 03:51:32,640 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:51:32,640 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:51:32,640 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-02-24 03:51:32,640 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:51:32,641 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:51:32,641 INFO L85 PathProgramCache]: Analyzing trace with hash -673447056, now seen corresponding path program 1 times [2022-02-24 03:51:32,641 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:51:32,641 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1544351518] [2022-02-24 03:51:32,653 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:51:32,655 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:51:32,803 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:51:32,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:32,833 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:51:32,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:32,838 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:51:32,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:32,842 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 03:51:32,868 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:51:32,869 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1544351518] [2022-02-24 03:51:32,869 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1544351518] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:51:32,869 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:51:32,869 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-02-24 03:51:32,869 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1196277914] [2022-02-24 03:51:32,869 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:51:32,870 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-02-24 03:51:32,870 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:51:32,870 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-02-24 03:51:32,870 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2022-02-24 03:51:32,870 INFO L87 Difference]: Start difference. First operand 28 states and 34 transitions. Second operand has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-02-24 03:51:32,994 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:51:32,995 INFO L93 Difference]: Finished difference Result 59 states and 82 transitions. [2022-02-24 03:51:32,995 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-02-24 03:51:32,995 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 24 [2022-02-24 03:51:32,996 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:51:32,997 INFO L225 Difference]: With dead ends: 59 [2022-02-24 03:51:32,997 INFO L226 Difference]: Without dead ends: 43 [2022-02-24 03:51:32,997 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2022-02-24 03:51:32,998 INFO L933 BasicCegarLoop]: 27 mSDtfsCounter, 30 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 112 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 122 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 112 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-02-24 03:51:32,999 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 43 Invalid, 122 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 112 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-02-24 03:51:32,999 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2022-02-24 03:51:33,007 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 35. [2022-02-24 03:51:33,007 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 27 states have (on average 1.3333333333333333) internal successors, (36), 28 states have internal predecessors, (36), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-02-24 03:51:33,008 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 43 transitions. [2022-02-24 03:51:33,008 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 43 transitions. Word has length 24 [2022-02-24 03:51:33,008 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:51:33,009 INFO L470 AbstractCegarLoop]: Abstraction has 35 states and 43 transitions. [2022-02-24 03:51:33,009 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-02-24 03:51:33,009 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 43 transitions. [2022-02-24 03:51:33,009 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-02-24 03:51:33,009 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:51:33,010 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:51:33,010 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-02-24 03:51:33,010 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:51:33,010 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:51:33,010 INFO L85 PathProgramCache]: Analyzing trace with hash 708533296, now seen corresponding path program 1 times [2022-02-24 03:51:33,010 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:51:33,011 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1850498475] [2022-02-24 03:51:33,011 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:51:33,011 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:51:33,068 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:51:33,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:33,100 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:51:33,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:33,107 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:51:33,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:33,110 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 03:51:33,150 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:51:33,150 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1850498475] [2022-02-24 03:51:33,150 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1850498475] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:51:33,150 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:51:33,151 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-02-24 03:51:33,151 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [735833936] [2022-02-24 03:51:33,151 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:51:33,151 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-02-24 03:51:33,151 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:51:33,152 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-02-24 03:51:33,152 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2022-02-24 03:51:33,152 INFO L87 Difference]: Start difference. First operand 35 states and 43 transitions. Second operand has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-02-24 03:51:33,249 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:51:33,250 INFO L93 Difference]: Finished difference Result 64 states and 85 transitions. [2022-02-24 03:51:33,250 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-02-24 03:51:33,250 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 24 [2022-02-24 03:51:33,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:51:33,252 INFO L225 Difference]: With dead ends: 64 [2022-02-24 03:51:33,252 INFO L226 Difference]: Without dead ends: 41 [2022-02-24 03:51:33,253 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2022-02-24 03:51:33,260 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 22 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 106 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 115 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 106 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-02-24 03:51:33,261 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 52 Invalid, 115 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 106 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-02-24 03:51:33,263 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2022-02-24 03:51:33,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 34. [2022-02-24 03:51:33,270 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 26 states have (on average 1.2692307692307692) internal successors, (33), 27 states have internal predecessors, (33), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-02-24 03:51:33,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 40 transitions. [2022-02-24 03:51:33,270 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 40 transitions. Word has length 24 [2022-02-24 03:51:33,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:51:33,271 INFO L470 AbstractCegarLoop]: Abstraction has 34 states and 40 transitions. [2022-02-24 03:51:33,271 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2022-02-24 03:51:33,271 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 40 transitions. [2022-02-24 03:51:33,271 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-02-24 03:51:33,271 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:51:33,271 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:51:33,272 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-02-24 03:51:33,272 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:51:33,272 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:51:33,272 INFO L85 PathProgramCache]: Analyzing trace with hash -2061972965, now seen corresponding path program 1 times [2022-02-24 03:51:33,272 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:51:33,272 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [455430840] [2022-02-24 03:51:33,272 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:51:33,273 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:51:33,362 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:51:33,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:33,421 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:51:33,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:33,437 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:51:33,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:33,440 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 03:51:33,493 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:51:33,493 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [455430840] [2022-02-24 03:51:33,493 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [455430840] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:51:33,493 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:51:33,493 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-02-24 03:51:33,493 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [109113686] [2022-02-24 03:51:33,493 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:51:33,494 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-02-24 03:51:33,494 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:51:33,494 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-02-24 03:51:33,494 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2022-02-24 03:51:33,494 INFO L87 Difference]: Start difference. First operand 34 states and 40 transitions. Second operand has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 8 states have internal predecessors, (19), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:33,655 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:51:33,655 INFO L93 Difference]: Finished difference Result 77 states and 98 transitions. [2022-02-24 03:51:33,656 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-02-24 03:51:33,656 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 8 states have internal predecessors, (19), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 25 [2022-02-24 03:51:33,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:51:33,661 INFO L225 Difference]: With dead ends: 77 [2022-02-24 03:51:33,661 INFO L226 Difference]: Without dead ends: 55 [2022-02-24 03:51:33,666 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 9 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=69, Invalid=141, Unknown=0, NotChecked=0, Total=210 [2022-02-24 03:51:33,667 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 72 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 94 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 115 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 94 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-02-24 03:51:33,668 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [74 Valid, 31 Invalid, 115 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 94 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-02-24 03:51:33,668 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2022-02-24 03:51:33,679 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 50. [2022-02-24 03:51:33,679 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 41 states have (on average 1.2926829268292683) internal successors, (53), 42 states have internal predecessors, (53), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-02-24 03:51:33,680 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 62 transitions. [2022-02-24 03:51:33,680 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 62 transitions. Word has length 25 [2022-02-24 03:51:33,680 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:51:33,680 INFO L470 AbstractCegarLoop]: Abstraction has 50 states and 62 transitions. [2022-02-24 03:51:33,680 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 8 states have internal predecessors, (19), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:33,680 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 62 transitions. [2022-02-24 03:51:33,681 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-02-24 03:51:33,681 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:51:33,681 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:51:33,681 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-02-24 03:51:33,682 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:51:33,682 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:51:33,682 INFO L85 PathProgramCache]: Analyzing trace with hash -2060125923, now seen corresponding path program 1 times [2022-02-24 03:51:33,682 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:51:33,682 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1815308908] [2022-02-24 03:51:33,682 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:51:33,682 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:51:33,758 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:51:33,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:33,823 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:51:33,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:33,830 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:51:33,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:33,835 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 03:51:33,863 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:51:33,863 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1815308908] [2022-02-24 03:51:33,863 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1815308908] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:51:33,863 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:51:33,863 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-02-24 03:51:33,863 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [67922691] [2022-02-24 03:51:33,863 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:51:33,864 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-02-24 03:51:33,864 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:51:33,864 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-02-24 03:51:33,864 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2022-02-24 03:51:33,865 INFO L87 Difference]: Start difference. First operand 50 states and 62 transitions. Second operand has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:34,073 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:51:34,073 INFO L93 Difference]: Finished difference Result 101 states and 129 transitions. [2022-02-24 03:51:34,074 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-02-24 03:51:34,074 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 25 [2022-02-24 03:51:34,074 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:51:34,077 INFO L225 Difference]: With dead ends: 101 [2022-02-24 03:51:34,077 INFO L226 Difference]: Without dead ends: 63 [2022-02-24 03:51:34,078 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2022-02-24 03:51:34,078 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 39 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 157 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 167 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 157 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-02-24 03:51:34,078 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 32 Invalid, 167 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 157 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-02-24 03:51:34,079 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2022-02-24 03:51:34,091 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 56. [2022-02-24 03:51:34,092 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 47 states have (on average 1.297872340425532) internal successors, (61), 48 states have internal predecessors, (61), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-02-24 03:51:34,092 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 70 transitions. [2022-02-24 03:51:34,092 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 70 transitions. Word has length 25 [2022-02-24 03:51:34,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:51:34,093 INFO L470 AbstractCegarLoop]: Abstraction has 56 states and 70 transitions. [2022-02-24 03:51:34,093 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:34,093 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 70 transitions. [2022-02-24 03:51:34,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-02-24 03:51:34,093 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:51:34,093 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:51:34,093 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2022-02-24 03:51:34,093 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:51:34,094 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:51:34,094 INFO L85 PathProgramCache]: Analyzing trace with hash 2067453981, now seen corresponding path program 1 times [2022-02-24 03:51:34,094 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:51:34,094 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1061271003] [2022-02-24 03:51:34,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:51:34,094 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:51:34,133 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:51:34,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:34,163 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:51:34,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:34,168 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:51:34,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:34,171 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 03:51:34,200 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:51:34,201 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1061271003] [2022-02-24 03:51:34,201 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1061271003] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:51:34,201 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:51:34,201 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-02-24 03:51:34,201 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [443786961] [2022-02-24 03:51:34,201 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:51:34,201 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-02-24 03:51:34,201 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:51:34,202 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-02-24 03:51:34,202 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2022-02-24 03:51:34,202 INFO L87 Difference]: Start difference. First operand 56 states and 70 transitions. Second operand has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 8 states have internal predecessors, (19), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:34,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:51:34,336 INFO L93 Difference]: Finished difference Result 105 states and 135 transitions. [2022-02-24 03:51:34,336 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-02-24 03:51:34,337 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 8 states have internal predecessors, (19), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 25 [2022-02-24 03:51:34,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:51:34,339 INFO L225 Difference]: With dead ends: 105 [2022-02-24 03:51:34,339 INFO L226 Difference]: Without dead ends: 80 [2022-02-24 03:51:34,339 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=83, Unknown=0, NotChecked=0, Total=132 [2022-02-24 03:51:34,340 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 79 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 127 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 82 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 143 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 127 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-02-24 03:51:34,340 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [82 Valid, 41 Invalid, 143 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 127 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-02-24 03:51:34,341 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2022-02-24 03:51:34,367 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 75. [2022-02-24 03:51:34,369 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 65 states have (on average 1.3076923076923077) internal successors, (85), 66 states have internal predecessors, (85), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:51:34,372 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 96 transitions. [2022-02-24 03:51:34,372 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 96 transitions. Word has length 25 [2022-02-24 03:51:34,373 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:51:34,373 INFO L470 AbstractCegarLoop]: Abstraction has 75 states and 96 transitions. [2022-02-24 03:51:34,373 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 8 states have internal predecessors, (19), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:34,373 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 96 transitions. [2022-02-24 03:51:34,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-02-24 03:51:34,377 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:51:34,377 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:51:34,377 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2022-02-24 03:51:34,377 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:51:34,378 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:51:34,378 INFO L85 PathProgramCache]: Analyzing trace with hash 2069301023, now seen corresponding path program 1 times [2022-02-24 03:51:34,378 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:51:34,378 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1423404030] [2022-02-24 03:51:34,378 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:51:34,378 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:51:34,414 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:51:34,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:34,545 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:51:34,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:34,549 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:51:34,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:34,552 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 03:51:34,592 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:51:34,592 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1423404030] [2022-02-24 03:51:34,592 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1423404030] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:51:34,593 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:51:34,593 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2022-02-24 03:51:34,593 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1509946983] [2022-02-24 03:51:34,593 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:51:34,593 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-02-24 03:51:34,593 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:51:34,593 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-02-24 03:51:34,593 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=120, Unknown=0, NotChecked=0, Total=156 [2022-02-24 03:51:34,594 INFO L87 Difference]: Start difference. First operand 75 states and 96 transitions. Second operand has 12 states, 12 states have (on average 1.5833333333333333) internal successors, (19), 10 states have internal predecessors, (19), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:34,719 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:51:34,720 INFO L93 Difference]: Finished difference Result 156 states and 205 transitions. [2022-02-24 03:51:34,720 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-02-24 03:51:34,720 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.5833333333333333) internal successors, (19), 10 states have internal predecessors, (19), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 25 [2022-02-24 03:51:34,720 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:51:34,721 INFO L225 Difference]: With dead ends: 156 [2022-02-24 03:51:34,721 INFO L226 Difference]: Without dead ends: 93 [2022-02-24 03:51:34,721 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 7 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=46, Invalid=164, Unknown=0, NotChecked=0, Total=210 [2022-02-24 03:51:34,721 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 48 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 217 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 226 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 217 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-02-24 03:51:34,722 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [49 Valid, 51 Invalid, 226 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 217 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-02-24 03:51:34,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2022-02-24 03:51:34,730 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 80. [2022-02-24 03:51:34,731 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 70 states have (on average 1.3) internal successors, (91), 70 states have internal predecessors, (91), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:51:34,731 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 102 transitions. [2022-02-24 03:51:34,731 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 102 transitions. Word has length 25 [2022-02-24 03:51:34,731 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:51:34,732 INFO L470 AbstractCegarLoop]: Abstraction has 80 states and 102 transitions. [2022-02-24 03:51:34,732 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 1.5833333333333333) internal successors, (19), 10 states have internal predecessors, (19), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:34,732 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 102 transitions. [2022-02-24 03:51:34,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-02-24 03:51:34,732 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:51:34,732 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:51:34,732 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2022-02-24 03:51:34,732 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:51:34,733 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:51:34,733 INFO L85 PathProgramCache]: Analyzing trace with hash -1640504642, now seen corresponding path program 2 times [2022-02-24 03:51:34,733 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:51:34,733 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [755405282] [2022-02-24 03:51:34,733 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:51:34,733 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:51:34,805 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:51:34,873 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:51:34,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:34,921 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:51:34,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:34,927 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:51:34,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:34,929 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 03:51:34,979 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:51:34,979 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [755405282] [2022-02-24 03:51:34,979 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [755405282] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:51:34,979 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:51:34,979 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2022-02-24 03:51:34,979 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1501144881] [2022-02-24 03:51:34,979 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:51:34,979 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-02-24 03:51:34,980 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:51:34,980 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-02-24 03:51:34,980 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2022-02-24 03:51:34,980 INFO L87 Difference]: Start difference. First operand 80 states and 102 transitions. Second operand has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:35,080 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:51:35,080 INFO L93 Difference]: Finished difference Result 161 states and 207 transitions. [2022-02-24 03:51:35,080 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-02-24 03:51:35,081 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 28 [2022-02-24 03:51:35,081 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:51:35,081 INFO L225 Difference]: With dead ends: 161 [2022-02-24 03:51:35,081 INFO L226 Difference]: Without dead ends: 98 [2022-02-24 03:51:35,084 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 15 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=79, Unknown=0, NotChecked=0, Total=110 [2022-02-24 03:51:35,085 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 39 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 177 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 187 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 177 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-02-24 03:51:35,086 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 32 Invalid, 187 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 177 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-02-24 03:51:35,086 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2022-02-24 03:51:35,096 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 89. [2022-02-24 03:51:35,096 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 79 states have (on average 1.2658227848101267) internal successors, (100), 79 states have internal predecessors, (100), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:51:35,096 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 111 transitions. [2022-02-24 03:51:35,096 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 111 transitions. Word has length 28 [2022-02-24 03:51:35,097 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:51:35,097 INFO L470 AbstractCegarLoop]: Abstraction has 89 states and 111 transitions. [2022-02-24 03:51:35,097 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:35,097 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 111 transitions. [2022-02-24 03:51:35,097 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-02-24 03:51:35,097 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:51:35,097 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:51:35,097 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2022-02-24 03:51:35,097 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:51:35,098 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:51:35,098 INFO L85 PathProgramCache]: Analyzing trace with hash 1643345404, now seen corresponding path program 1 times [2022-02-24 03:51:35,098 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:51:35,098 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [365302602] [2022-02-24 03:51:35,098 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:51:35,098 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:51:35,147 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:51:35,261 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:51:35,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:35,353 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:51:35,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:35,357 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:51:35,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:35,360 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 03:51:35,438 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:51:35,438 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [365302602] [2022-02-24 03:51:35,438 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [365302602] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:51:35,439 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:51:35,439 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2022-02-24 03:51:35,439 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1281105635] [2022-02-24 03:51:35,439 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:51:35,439 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-02-24 03:51:35,439 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:51:35,439 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-02-24 03:51:35,439 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=93, Unknown=0, NotChecked=0, Total=132 [2022-02-24 03:51:35,439 INFO L87 Difference]: Start difference. First operand 89 states and 111 transitions. Second operand has 10 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:35,552 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:51:35,552 INFO L93 Difference]: Finished difference Result 185 states and 237 transitions. [2022-02-24 03:51:35,552 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-02-24 03:51:35,552 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 28 [2022-02-24 03:51:35,552 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:51:35,553 INFO L225 Difference]: With dead ends: 185 [2022-02-24 03:51:35,553 INFO L226 Difference]: Without dead ends: 113 [2022-02-24 03:51:35,553 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 14 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=51, Invalid=131, Unknown=0, NotChecked=0, Total=182 [2022-02-24 03:51:35,554 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 44 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 154 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 165 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 154 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-02-24 03:51:35,554 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [45 Valid, 31 Invalid, 165 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 154 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-02-24 03:51:35,554 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2022-02-24 03:51:35,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 93. [2022-02-24 03:51:35,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 83 states have (on average 1.2771084337349397) internal successors, (106), 84 states have internal predecessors, (106), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:51:35,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 117 transitions. [2022-02-24 03:51:35,564 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 117 transitions. Word has length 28 [2022-02-24 03:51:35,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:51:35,564 INFO L470 AbstractCegarLoop]: Abstraction has 93 states and 117 transitions. [2022-02-24 03:51:35,564 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:35,564 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 117 transitions. [2022-02-24 03:51:35,565 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-02-24 03:51:35,565 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:51:35,565 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:51:35,565 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2022-02-24 03:51:35,565 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:51:35,565 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:51:35,565 INFO L85 PathProgramCache]: Analyzing trace with hash 1477805054, now seen corresponding path program 2 times [2022-02-24 03:51:35,566 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:51:35,566 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [7643153] [2022-02-24 03:51:35,566 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:51:35,566 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:51:35,596 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:51:35,631 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:51:35,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:35,733 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:51:35,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:35,739 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:51:35,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:35,742 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 03:51:35,818 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:51:35,818 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [7643153] [2022-02-24 03:51:35,818 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [7643153] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:51:35,818 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:51:35,818 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-02-24 03:51:35,818 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [195971469] [2022-02-24 03:51:35,818 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:51:35,818 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-02-24 03:51:35,818 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:51:35,819 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-02-24 03:51:35,819 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=163, Unknown=0, NotChecked=0, Total=210 [2022-02-24 03:51:35,819 INFO L87 Difference]: Start difference. First operand 93 states and 117 transitions. Second operand has 14 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 12 states have internal predecessors, (22), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:35,989 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:51:35,989 INFO L93 Difference]: Finished difference Result 199 states and 255 transitions. [2022-02-24 03:51:35,990 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-02-24 03:51:35,990 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 12 states have internal predecessors, (22), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 28 [2022-02-24 03:51:35,990 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:51:35,990 INFO L225 Difference]: With dead ends: 199 [2022-02-24 03:51:35,990 INFO L226 Difference]: Without dead ends: 118 [2022-02-24 03:51:35,991 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 7 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=57, Invalid=215, Unknown=0, NotChecked=0, Total=272 [2022-02-24 03:51:35,991 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 57 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 371 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 381 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 371 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-02-24 03:51:35,991 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [58 Valid, 55 Invalid, 381 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 371 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-02-24 03:51:35,992 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2022-02-24 03:51:36,001 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 101. [2022-02-24 03:51:36,001 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 101 states, 91 states have (on average 1.2747252747252746) internal successors, (116), 91 states have internal predecessors, (116), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:51:36,001 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 127 transitions. [2022-02-24 03:51:36,002 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 127 transitions. Word has length 28 [2022-02-24 03:51:36,002 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:51:36,002 INFO L470 AbstractCegarLoop]: Abstraction has 101 states and 127 transitions. [2022-02-24 03:51:36,002 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 12 states have internal predecessors, (22), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:36,002 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 127 transitions. [2022-02-24 03:51:36,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-02-24 03:51:36,002 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:51:36,002 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:51:36,002 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2022-02-24 03:51:36,003 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:51:36,003 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:51:36,003 INFO L85 PathProgramCache]: Analyzing trace with hash 942246269, now seen corresponding path program 3 times [2022-02-24 03:51:36,003 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:51:36,003 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [977059894] [2022-02-24 03:51:36,003 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:51:36,003 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:51:36,073 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:51:36,145 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:51:36,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:36,218 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:51:36,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:36,223 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:51:36,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:36,225 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 03:51:36,302 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:51:36,302 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [977059894] [2022-02-24 03:51:36,302 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [977059894] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:51:36,302 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:51:36,302 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2022-02-24 03:51:36,302 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1620283314] [2022-02-24 03:51:36,302 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:51:36,303 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-02-24 03:51:36,303 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:51:36,303 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-02-24 03:51:36,303 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=79, Unknown=0, NotChecked=0, Total=110 [2022-02-24 03:51:36,303 INFO L87 Difference]: Start difference. First operand 101 states and 127 transitions. Second operand has 10 states, 10 states have (on average 2.5) internal successors, (25), 9 states have internal predecessors, (25), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:36,447 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:51:36,448 INFO L93 Difference]: Finished difference Result 203 states and 256 transitions. [2022-02-24 03:51:36,448 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-02-24 03:51:36,448 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.5) internal successors, (25), 9 states have internal predecessors, (25), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 31 [2022-02-24 03:51:36,448 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:51:36,449 INFO L225 Difference]: With dead ends: 203 [2022-02-24 03:51:36,449 INFO L226 Difference]: Without dead ends: 122 [2022-02-24 03:51:36,449 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 6 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2022-02-24 03:51:36,449 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 39 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 265 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 275 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 265 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-02-24 03:51:36,450 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 35 Invalid, 275 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 265 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-02-24 03:51:36,450 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2022-02-24 03:51:36,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 110. [2022-02-24 03:51:36,460 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 110 states, 100 states have (on average 1.25) internal successors, (125), 100 states have internal predecessors, (125), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:51:36,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 136 transitions. [2022-02-24 03:51:36,461 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 136 transitions. Word has length 31 [2022-02-24 03:51:36,461 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:51:36,461 INFO L470 AbstractCegarLoop]: Abstraction has 110 states and 136 transitions. [2022-02-24 03:51:36,461 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.5) internal successors, (25), 9 states have internal predecessors, (25), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:36,461 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 136 transitions. [2022-02-24 03:51:36,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-02-24 03:51:36,461 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:51:36,461 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:51:36,462 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2022-02-24 03:51:36,462 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:51:36,462 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:51:36,462 INFO L85 PathProgramCache]: Analyzing trace with hash -646101633, now seen corresponding path program 2 times [2022-02-24 03:51:36,462 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:51:36,462 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1473889261] [2022-02-24 03:51:36,463 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:51:36,463 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:51:36,567 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:51:36,680 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:51:36,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:36,743 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:51:36,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:36,748 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:51:36,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:36,752 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 03:51:36,868 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:51:36,868 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1473889261] [2022-02-24 03:51:36,868 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1473889261] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:51:36,868 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:51:36,868 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-02-24 03:51:36,868 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1431474042] [2022-02-24 03:51:36,868 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:51:36,869 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-02-24 03:51:36,869 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:51:36,869 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-02-24 03:51:36,869 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=114, Unknown=0, NotChecked=0, Total=156 [2022-02-24 03:51:36,869 INFO L87 Difference]: Start difference. First operand 110 states and 136 transitions. Second operand has 11 states, 11 states have (on average 2.272727272727273) internal successors, (25), 10 states have internal predecessors, (25), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:37,031 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:51:37,031 INFO L93 Difference]: Finished difference Result 224 states and 277 transitions. [2022-02-24 03:51:37,032 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-02-24 03:51:37,032 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.272727272727273) internal successors, (25), 10 states have internal predecessors, (25), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 31 [2022-02-24 03:51:37,032 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:51:37,033 INFO L225 Difference]: With dead ends: 224 [2022-02-24 03:51:37,033 INFO L226 Difference]: Without dead ends: 134 [2022-02-24 03:51:37,033 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 14 SyntacticMatches, 5 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=54, Invalid=156, Unknown=0, NotChecked=0, Total=210 [2022-02-24 03:51:37,034 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 41 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 204 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 214 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 204 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-02-24 03:51:37,034 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [42 Valid, 35 Invalid, 214 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 204 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-02-24 03:51:37,034 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2022-02-24 03:51:37,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 110. [2022-02-24 03:51:37,049 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 110 states, 100 states have (on average 1.25) internal successors, (125), 100 states have internal predecessors, (125), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:51:37,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 136 transitions. [2022-02-24 03:51:37,049 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 136 transitions. Word has length 31 [2022-02-24 03:51:37,049 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:51:37,050 INFO L470 AbstractCegarLoop]: Abstraction has 110 states and 136 transitions. [2022-02-24 03:51:37,050 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.272727272727273) internal successors, (25), 10 states have internal predecessors, (25), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:37,050 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 136 transitions. [2022-02-24 03:51:37,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-02-24 03:51:37,050 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:51:37,050 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:51:37,050 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2022-02-24 03:51:37,050 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:51:37,051 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:51:37,051 INFO L85 PathProgramCache]: Analyzing trace with hash -1657218883, now seen corresponding path program 3 times [2022-02-24 03:51:37,051 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:51:37,051 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1535210912] [2022-02-24 03:51:37,051 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:51:37,051 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:51:37,084 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:51:37,185 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:51:37,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:37,242 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:51:37,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:37,246 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:51:37,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:37,249 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 03:51:37,358 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:51:37,358 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1535210912] [2022-02-24 03:51:37,358 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1535210912] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:51:37,358 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:51:37,358 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2022-02-24 03:51:37,358 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1879231025] [2022-02-24 03:51:37,358 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:51:37,358 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-02-24 03:51:37,358 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:51:37,359 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-02-24 03:51:37,359 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=132, Unknown=0, NotChecked=0, Total=182 [2022-02-24 03:51:37,359 INFO L87 Difference]: Start difference. First operand 110 states and 136 transitions. Second operand has 12 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 11 states have internal predecessors, (25), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:37,521 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:51:37,521 INFO L93 Difference]: Finished difference Result 227 states and 286 transitions. [2022-02-24 03:51:37,521 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-02-24 03:51:37,521 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 11 states have internal predecessors, (25), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 31 [2022-02-24 03:51:37,522 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:51:37,522 INFO L225 Difference]: With dead ends: 227 [2022-02-24 03:51:37,522 INFO L226 Difference]: Without dead ends: 137 [2022-02-24 03:51:37,523 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 14 SyntacticMatches, 4 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=64, Invalid=176, Unknown=0, NotChecked=0, Total=240 [2022-02-24 03:51:37,523 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 45 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 293 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 305 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 293 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-02-24 03:51:37,523 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [46 Valid, 37 Invalid, 305 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 293 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-02-24 03:51:37,524 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2022-02-24 03:51:37,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 111. [2022-02-24 03:51:37,538 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 101 states have (on average 1.2574257425742574) internal successors, (127), 102 states have internal predecessors, (127), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:51:37,538 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 138 transitions. [2022-02-24 03:51:37,538 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 138 transitions. Word has length 31 [2022-02-24 03:51:37,538 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:51:37,538 INFO L470 AbstractCegarLoop]: Abstraction has 111 states and 138 transitions. [2022-02-24 03:51:37,539 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 11 states have internal predecessors, (25), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:37,539 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 138 transitions. [2022-02-24 03:51:37,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-02-24 03:51:37,539 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:51:37,539 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:51:37,539 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2022-02-24 03:51:37,539 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:51:37,540 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:51:37,540 INFO L85 PathProgramCache]: Analyzing trace with hash -1822759233, now seen corresponding path program 3 times [2022-02-24 03:51:37,540 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:51:37,540 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [951273348] [2022-02-24 03:51:37,540 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:51:37,540 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:51:37,572 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:51:37,601 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:51:37,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:37,627 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:51:37,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:37,634 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:51:37,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:37,637 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 03:51:37,707 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:51:37,707 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [951273348] [2022-02-24 03:51:37,708 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [951273348] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:51:37,708 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:51:37,708 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-02-24 03:51:37,708 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [604045726] [2022-02-24 03:51:37,708 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:51:37,708 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-02-24 03:51:37,708 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:51:37,708 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-02-24 03:51:37,708 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2022-02-24 03:51:37,708 INFO L87 Difference]: Start difference. First operand 111 states and 138 transitions. Second operand has 11 states, 11 states have (on average 2.272727272727273) internal successors, (25), 10 states have internal predecessors, (25), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:37,865 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:51:37,865 INFO L93 Difference]: Finished difference Result 232 states and 292 transitions. [2022-02-24 03:51:37,866 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-02-24 03:51:37,866 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.272727272727273) internal successors, (25), 10 states have internal predecessors, (25), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 31 [2022-02-24 03:51:37,866 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:51:37,866 INFO L225 Difference]: With dead ends: 232 [2022-02-24 03:51:37,866 INFO L226 Difference]: Without dead ends: 133 [2022-02-24 03:51:37,867 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 13 SyntacticMatches, 4 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=119, Unknown=0, NotChecked=0, Total=156 [2022-02-24 03:51:37,867 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 47 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 357 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 362 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 357 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-02-24 03:51:37,867 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 30 Invalid, 362 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 357 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-02-24 03:51:37,868 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2022-02-24 03:51:37,879 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 117. [2022-02-24 03:51:37,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117 states, 107 states have (on average 1.2429906542056075) internal successors, (133), 108 states have internal predecessors, (133), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:51:37,879 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 144 transitions. [2022-02-24 03:51:37,879 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 144 transitions. Word has length 31 [2022-02-24 03:51:37,880 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:51:37,880 INFO L470 AbstractCegarLoop]: Abstraction has 117 states and 144 transitions. [2022-02-24 03:51:37,880 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.272727272727273) internal successors, (25), 10 states have internal predecessors, (25), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:37,880 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 144 transitions. [2022-02-24 03:51:37,880 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-02-24 03:51:37,880 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:51:37,880 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:51:37,880 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2022-02-24 03:51:37,880 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:51:37,880 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:51:37,881 INFO L85 PathProgramCache]: Analyzing trace with hash -664471970, now seen corresponding path program 4 times [2022-02-24 03:51:37,881 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:51:37,881 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [41448] [2022-02-24 03:51:37,881 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:51:37,881 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:51:37,942 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:51:38,010 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:51:38,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:38,070 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:51:38,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:38,074 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:51:38,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:38,076 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 03:51:38,176 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:51:38,176 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [41448] [2022-02-24 03:51:38,176 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [41448] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:51:38,176 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:51:38,176 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-02-24 03:51:38,176 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1955878349] [2022-02-24 03:51:38,176 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:51:38,176 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-02-24 03:51:38,176 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:51:38,177 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-02-24 03:51:38,177 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2022-02-24 03:51:38,177 INFO L87 Difference]: Start difference. First operand 117 states and 144 transitions. Second operand has 11 states, 11 states have (on average 2.5454545454545454) internal successors, (28), 10 states have internal predecessors, (28), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:38,337 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:51:38,338 INFO L93 Difference]: Finished difference Result 253 states and 310 transitions. [2022-02-24 03:51:38,338 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-02-24 03:51:38,338 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.5454545454545454) internal successors, (28), 10 states have internal predecessors, (28), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 34 [2022-02-24 03:51:38,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:51:38,339 INFO L225 Difference]: With dead ends: 253 [2022-02-24 03:51:38,339 INFO L226 Difference]: Without dead ends: 148 [2022-02-24 03:51:38,339 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 15 SyntacticMatches, 8 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=39, Invalid=117, Unknown=0, NotChecked=0, Total=156 [2022-02-24 03:51:38,339 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 39 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 328 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 338 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 328 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-02-24 03:51:38,340 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 35 Invalid, 338 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 328 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-02-24 03:51:38,340 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2022-02-24 03:51:38,353 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 126. [2022-02-24 03:51:38,353 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 126 states, 116 states have (on average 1.2241379310344827) internal successors, (142), 117 states have internal predecessors, (142), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:51:38,353 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 153 transitions. [2022-02-24 03:51:38,354 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 153 transitions. Word has length 34 [2022-02-24 03:51:38,354 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:51:38,354 INFO L470 AbstractCegarLoop]: Abstraction has 126 states and 153 transitions. [2022-02-24 03:51:38,354 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.5454545454545454) internal successors, (28), 10 states have internal predecessors, (28), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:38,354 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 153 transitions. [2022-02-24 03:51:38,354 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-02-24 03:51:38,354 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:51:38,354 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:51:38,354 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2022-02-24 03:51:38,354 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:51:38,355 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:51:38,355 INFO L85 PathProgramCache]: Analyzing trace with hash -1482120420, now seen corresponding path program 4 times [2022-02-24 03:51:38,355 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:51:38,355 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1965372356] [2022-02-24 03:51:38,355 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:51:38,355 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:51:38,460 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:51:38,549 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:51:38,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:38,613 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:51:38,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:38,622 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:51:38,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:38,624 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 03:51:38,739 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:51:38,739 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1965372356] [2022-02-24 03:51:38,739 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1965372356] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:51:38,739 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:51:38,739 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2022-02-24 03:51:38,739 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1467284560] [2022-02-24 03:51:38,739 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:51:38,739 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-02-24 03:51:38,739 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:51:38,740 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-02-24 03:51:38,740 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2022-02-24 03:51:38,740 INFO L87 Difference]: Start difference. First operand 126 states and 153 transitions. Second operand has 12 states, 12 states have (on average 2.3333333333333335) internal successors, (28), 11 states have internal predecessors, (28), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:38,904 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:51:38,904 INFO L93 Difference]: Finished difference Result 271 states and 328 transitions. [2022-02-24 03:51:38,906 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-02-24 03:51:38,906 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.3333333333333335) internal successors, (28), 11 states have internal predecessors, (28), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 34 [2022-02-24 03:51:38,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:51:38,906 INFO L225 Difference]: With dead ends: 271 [2022-02-24 03:51:38,906 INFO L226 Difference]: Without dead ends: 157 [2022-02-24 03:51:38,907 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 14 SyntacticMatches, 7 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=57, Invalid=183, Unknown=0, NotChecked=0, Total=240 [2022-02-24 03:51:38,907 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 41 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 305 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 315 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 305 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-02-24 03:51:38,907 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [42 Valid, 36 Invalid, 315 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 305 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-02-24 03:51:38,908 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2022-02-24 03:51:38,922 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 126. [2022-02-24 03:51:38,922 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 126 states, 116 states have (on average 1.2241379310344827) internal successors, (142), 117 states have internal predecessors, (142), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:51:38,923 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 153 transitions. [2022-02-24 03:51:38,923 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 153 transitions. Word has length 34 [2022-02-24 03:51:38,923 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:51:38,923 INFO L470 AbstractCegarLoop]: Abstraction has 126 states and 153 transitions. [2022-02-24 03:51:38,923 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.3333333333333335) internal successors, (28), 11 states have internal predecessors, (28), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:38,923 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 153 transitions. [2022-02-24 03:51:38,923 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-02-24 03:51:38,923 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:51:38,923 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:51:38,924 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2022-02-24 03:51:38,924 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:51:38,924 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:51:38,924 INFO L85 PathProgramCache]: Analyzing trace with hash 1224498974, now seen corresponding path program 5 times [2022-02-24 03:51:38,924 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:51:38,924 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1060865340] [2022-02-24 03:51:38,924 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:51:38,924 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:51:39,026 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:51:39,119 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:51:39,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:39,191 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:51:39,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:39,195 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:51:39,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:39,213 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 03:51:39,332 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:51:39,332 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1060865340] [2022-02-24 03:51:39,332 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1060865340] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:51:39,332 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:51:39,333 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2022-02-24 03:51:39,333 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [19079697] [2022-02-24 03:51:39,333 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:51:39,333 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-02-24 03:51:39,333 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:51:39,333 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-02-24 03:51:39,333 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=157, Unknown=0, NotChecked=0, Total=210 [2022-02-24 03:51:39,333 INFO L87 Difference]: Start difference. First operand 126 states and 153 transitions. Second operand has 13 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 12 states have internal predecessors, (28), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:39,563 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:51:39,563 INFO L93 Difference]: Finished difference Result 265 states and 322 transitions. [2022-02-24 03:51:39,563 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-02-24 03:51:39,564 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 12 states have internal predecessors, (28), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 34 [2022-02-24 03:51:39,564 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:51:39,564 INFO L225 Difference]: With dead ends: 265 [2022-02-24 03:51:39,564 INFO L226 Difference]: Without dead ends: 151 [2022-02-24 03:51:39,565 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 14 SyntacticMatches, 6 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=67, Invalid=205, Unknown=0, NotChecked=0, Total=272 [2022-02-24 03:51:39,565 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 46 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 444 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 455 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 444 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-02-24 03:51:39,565 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [47 Valid, 39 Invalid, 455 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 444 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-02-24 03:51:39,566 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2022-02-24 03:51:39,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 126. [2022-02-24 03:51:39,581 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 126 states, 116 states have (on average 1.2241379310344827) internal successors, (142), 117 states have internal predecessors, (142), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:51:39,582 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 153 transitions. [2022-02-24 03:51:39,582 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 153 transitions. Word has length 34 [2022-02-24 03:51:39,582 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:51:39,582 INFO L470 AbstractCegarLoop]: Abstraction has 126 states and 153 transitions. [2022-02-24 03:51:39,582 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 12 states have internal predecessors, (28), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:39,582 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 153 transitions. [2022-02-24 03:51:39,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-02-24 03:51:39,582 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:51:39,582 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:51:39,582 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2022-02-24 03:51:39,583 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:51:39,583 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:51:39,583 INFO L85 PathProgramCache]: Analyzing trace with hash 213381724, now seen corresponding path program 6 times [2022-02-24 03:51:39,583 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:51:39,583 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [522726127] [2022-02-24 03:51:39,583 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:51:39,583 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:51:39,612 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:51:39,714 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:51:39,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:39,787 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:51:39,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:39,792 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:51:39,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:39,799 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 03:51:39,923 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:51:39,924 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [522726127] [2022-02-24 03:51:39,924 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [522726127] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:51:39,924 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:51:39,924 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-02-24 03:51:39,924 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1037131924] [2022-02-24 03:51:39,924 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:51:39,924 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-02-24 03:51:39,924 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:51:39,924 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-02-24 03:51:39,924 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=179, Unknown=0, NotChecked=0, Total=240 [2022-02-24 03:51:39,925 INFO L87 Difference]: Start difference. First operand 126 states and 153 transitions. Second operand has 14 states, 14 states have (on average 2.0) internal successors, (28), 13 states have internal predecessors, (28), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:40,159 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:51:40,159 INFO L93 Difference]: Finished difference Result 265 states and 325 transitions. [2022-02-24 03:51:40,160 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-02-24 03:51:40,160 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.0) internal successors, (28), 13 states have internal predecessors, (28), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 34 [2022-02-24 03:51:40,160 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:51:40,161 INFO L225 Difference]: With dead ends: 265 [2022-02-24 03:51:40,161 INFO L226 Difference]: Without dead ends: 151 [2022-02-24 03:51:40,162 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 14 SyntacticMatches, 5 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=77, Invalid=229, Unknown=0, NotChecked=0, Total=306 [2022-02-24 03:51:40,162 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 48 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 394 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 406 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 394 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-02-24 03:51:40,162 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [49 Valid, 41 Invalid, 406 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 394 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-02-24 03:51:40,163 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2022-02-24 03:51:40,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 129. [2022-02-24 03:51:40,181 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 129 states, 119 states have (on average 1.2436974789915967) internal successors, (148), 120 states have internal predecessors, (148), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:51:40,182 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 159 transitions. [2022-02-24 03:51:40,182 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 159 transitions. Word has length 34 [2022-02-24 03:51:40,182 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:51:40,182 INFO L470 AbstractCegarLoop]: Abstraction has 129 states and 159 transitions. [2022-02-24 03:51:40,182 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.0) internal successors, (28), 13 states have internal predecessors, (28), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:40,182 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 159 transitions. [2022-02-24 03:51:40,182 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-02-24 03:51:40,182 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:51:40,183 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:51:40,183 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2022-02-24 03:51:40,183 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:51:40,183 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:51:40,183 INFO L85 PathProgramCache]: Analyzing trace with hash 47841374, now seen corresponding path program 4 times [2022-02-24 03:51:40,183 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:51:40,183 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [338604210] [2022-02-24 03:51:40,183 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:51:40,183 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:51:40,216 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:51:40,250 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:51:40,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:40,356 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:51:40,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:40,372 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:51:40,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:40,375 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 03:51:40,549 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:51:40,549 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [338604210] [2022-02-24 03:51:40,549 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [338604210] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:51:40,549 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:51:40,549 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2022-02-24 03:51:40,550 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1458771598] [2022-02-24 03:51:40,550 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:51:40,550 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-02-24 03:51:40,550 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:51:40,550 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-02-24 03:51:40,550 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=273, Unknown=0, NotChecked=0, Total=342 [2022-02-24 03:51:40,550 INFO L87 Difference]: Start difference. First operand 129 states and 159 transitions. Second operand has 18 states, 18 states have (on average 1.5555555555555556) internal successors, (28), 16 states have internal predecessors, (28), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:40,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:51:40,755 INFO L93 Difference]: Finished difference Result 285 states and 355 transitions. [2022-02-24 03:51:40,755 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-02-24 03:51:40,756 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.5555555555555556) internal successors, (28), 16 states have internal predecessors, (28), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 34 [2022-02-24 03:51:40,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:51:40,756 INFO L225 Difference]: With dead ends: 285 [2022-02-24 03:51:40,756 INFO L226 Difference]: Without dead ends: 168 [2022-02-24 03:51:40,757 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 7 SyntacticMatches, 4 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2022-02-24 03:51:40,757 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 54 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 451 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 460 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 451 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-02-24 03:51:40,757 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [55 Valid, 51 Invalid, 460 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 451 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-02-24 03:51:40,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2022-02-24 03:51:40,775 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 143. [2022-02-24 03:51:40,776 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 133 states have (on average 1.2481203007518797) internal successors, (166), 133 states have internal predecessors, (166), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:51:40,776 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 177 transitions. [2022-02-24 03:51:40,776 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 177 transitions. Word has length 34 [2022-02-24 03:51:40,776 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:51:40,776 INFO L470 AbstractCegarLoop]: Abstraction has 143 states and 177 transitions. [2022-02-24 03:51:40,777 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 1.5555555555555556) internal successors, (28), 16 states have internal predecessors, (28), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:40,777 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 177 transitions. [2022-02-24 03:51:40,777 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-02-24 03:51:40,777 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:51:40,777 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:51:40,777 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2022-02-24 03:51:40,777 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:51:40,777 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:51:40,777 INFO L85 PathProgramCache]: Analyzing trace with hash 1002983901, now seen corresponding path program 5 times [2022-02-24 03:51:40,777 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:51:40,778 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1462839698] [2022-02-24 03:51:40,778 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:51:40,778 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:51:40,841 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:51:40,909 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:51:40,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:40,956 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:51:40,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:40,959 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:51:40,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:40,962 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 03:51:41,099 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:51:41,099 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1462839698] [2022-02-24 03:51:41,099 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1462839698] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:51:41,099 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:51:41,099 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2022-02-24 03:51:41,099 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [253005673] [2022-02-24 03:51:41,099 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:51:41,099 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-02-24 03:51:41,100 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:51:41,100 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-02-24 03:51:41,100 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=117, Unknown=0, NotChecked=0, Total=156 [2022-02-24 03:51:41,100 INFO L87 Difference]: Start difference. First operand 143 states and 177 transitions. Second operand has 12 states, 12 states have (on average 2.5833333333333335) internal successors, (31), 11 states have internal predecessors, (31), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:41,291 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:51:41,291 INFO L93 Difference]: Finished difference Result 299 states and 366 transitions. [2022-02-24 03:51:41,292 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-02-24 03:51:41,292 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.5833333333333335) internal successors, (31), 11 states have internal predecessors, (31), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 37 [2022-02-24 03:51:41,292 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:51:41,293 INFO L225 Difference]: With dead ends: 299 [2022-02-24 03:51:41,293 INFO L226 Difference]: Without dead ends: 182 [2022-02-24 03:51:41,293 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 15 SyntacticMatches, 10 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=43, Invalid=139, Unknown=0, NotChecked=0, Total=182 [2022-02-24 03:51:41,293 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 39 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 357 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 367 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 357 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-02-24 03:51:41,293 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 37 Invalid, 367 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 357 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-02-24 03:51:41,294 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2022-02-24 03:51:41,322 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 152. [2022-02-24 03:51:41,322 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 152 states, 142 states have (on average 1.232394366197183) internal successors, (175), 142 states have internal predecessors, (175), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:51:41,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 186 transitions. [2022-02-24 03:51:41,323 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 186 transitions. Word has length 37 [2022-02-24 03:51:41,323 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:51:41,323 INFO L470 AbstractCegarLoop]: Abstraction has 152 states and 186 transitions. [2022-02-24 03:51:41,323 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 2.5833333333333335) internal successors, (31), 11 states have internal predecessors, (31), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:41,323 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 186 transitions. [2022-02-24 03:51:41,323 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-02-24 03:51:41,323 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:51:41,323 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:51:41,323 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2022-02-24 03:51:41,323 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:51:41,324 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:51:41,324 INFO L85 PathProgramCache]: Analyzing trace with hash -802454433, now seen corresponding path program 7 times [2022-02-24 03:51:41,324 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:51:41,324 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1076591419] [2022-02-24 03:51:41,324 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:51:41,324 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:51:41,433 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:51:41,543 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:51:41,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:41,607 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:51:41,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:41,610 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:51:41,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:41,614 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 03:51:41,796 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:51:41,796 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1076591419] [2022-02-24 03:51:41,796 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1076591419] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:51:41,796 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:51:41,796 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2022-02-24 03:51:41,796 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1705196891] [2022-02-24 03:51:41,796 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:51:41,796 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-02-24 03:51:41,797 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:51:41,797 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-02-24 03:51:41,797 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=162, Unknown=0, NotChecked=0, Total=210 [2022-02-24 03:51:41,797 INFO L87 Difference]: Start difference. First operand 152 states and 186 transitions. Second operand has 13 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 12 states have internal predecessors, (31), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:42,037 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:51:42,039 INFO L93 Difference]: Finished difference Result 317 states and 384 transitions. [2022-02-24 03:51:42,039 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-02-24 03:51:42,039 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 12 states have internal predecessors, (31), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 37 [2022-02-24 03:51:42,040 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:51:42,040 INFO L225 Difference]: With dead ends: 317 [2022-02-24 03:51:42,040 INFO L226 Difference]: Without dead ends: 191 [2022-02-24 03:51:42,041 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 14 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 82 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=60, Invalid=212, Unknown=0, NotChecked=0, Total=272 [2022-02-24 03:51:42,042 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 44 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 328 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 338 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 328 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-02-24 03:51:42,042 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [45 Valid, 34 Invalid, 338 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 328 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-02-24 03:51:42,042 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 191 states. [2022-02-24 03:51:42,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 191 to 152. [2022-02-24 03:51:42,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 152 states, 142 states have (on average 1.232394366197183) internal successors, (175), 142 states have internal predecessors, (175), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:51:42,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 186 transitions. [2022-02-24 03:51:42,074 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 186 transitions. Word has length 37 [2022-02-24 03:51:42,074 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:51:42,074 INFO L470 AbstractCegarLoop]: Abstraction has 152 states and 186 transitions. [2022-02-24 03:51:42,074 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 12 states have internal predecessors, (31), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:42,075 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 186 transitions. [2022-02-24 03:51:42,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-02-24 03:51:42,075 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:51:42,075 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:51:42,075 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2022-02-24 03:51:42,075 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:51:42,075 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:51:42,075 INFO L85 PathProgramCache]: Analyzing trace with hash -1620102883, now seen corresponding path program 8 times [2022-02-24 03:51:42,075 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:51:42,075 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1723045644] [2022-02-24 03:51:42,075 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:51:42,076 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:51:42,207 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:51:42,315 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:51:42,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:42,392 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:51:42,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:42,399 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:51:42,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:42,401 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 03:51:42,555 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:51:42,555 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1723045644] [2022-02-24 03:51:42,555 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1723045644] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:51:42,555 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:51:42,555 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-02-24 03:51:42,555 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1222461767] [2022-02-24 03:51:42,555 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:51:42,555 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-02-24 03:51:42,555 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:51:42,556 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-02-24 03:51:42,556 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=184, Unknown=0, NotChecked=0, Total=240 [2022-02-24 03:51:42,556 INFO L87 Difference]: Start difference. First operand 152 states and 186 transitions. Second operand has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 13 states have internal predecessors, (31), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:42,730 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:51:42,731 INFO L93 Difference]: Finished difference Result 311 states and 378 transitions. [2022-02-24 03:51:42,736 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-02-24 03:51:42,736 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 13 states have internal predecessors, (31), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 37 [2022-02-24 03:51:42,736 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:51:42,737 INFO L225 Difference]: With dead ends: 311 [2022-02-24 03:51:42,737 INFO L226 Difference]: Without dead ends: 185 [2022-02-24 03:51:42,737 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 14 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=70, Invalid=236, Unknown=0, NotChecked=0, Total=306 [2022-02-24 03:51:42,737 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 50 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 318 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 329 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 318 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-02-24 03:51:42,738 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [51 Valid, 34 Invalid, 329 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 318 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-02-24 03:51:42,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 185 states. [2022-02-24 03:51:42,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 185 to 152. [2022-02-24 03:51:42,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 152 states, 142 states have (on average 1.232394366197183) internal successors, (175), 142 states have internal predecessors, (175), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:51:42,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 186 transitions. [2022-02-24 03:51:42,763 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 186 transitions. Word has length 37 [2022-02-24 03:51:42,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:51:42,763 INFO L470 AbstractCegarLoop]: Abstraction has 152 states and 186 transitions. [2022-02-24 03:51:42,763 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 13 states have internal predecessors, (31), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:42,763 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 186 transitions. [2022-02-24 03:51:42,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-02-24 03:51:42,763 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:51:42,763 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:51:42,764 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2022-02-24 03:51:42,764 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:51:42,764 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:51:42,764 INFO L85 PathProgramCache]: Analyzing trace with hash 1086516511, now seen corresponding path program 9 times [2022-02-24 03:51:42,764 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:51:42,764 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1086609237] [2022-02-24 03:51:42,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:51:42,764 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:51:42,874 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:51:42,980 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:51:42,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:43,053 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:51:43,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:43,058 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:51:43,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:43,061 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 03:51:43,250 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:51:43,250 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1086609237] [2022-02-24 03:51:43,251 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1086609237] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:51:43,251 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:51:43,251 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-02-24 03:51:43,251 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [801957957] [2022-02-24 03:51:43,251 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:51:43,251 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-02-24 03:51:43,251 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:51:43,251 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-02-24 03:51:43,251 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=208, Unknown=0, NotChecked=0, Total=272 [2022-02-24 03:51:43,252 INFO L87 Difference]: Start difference. First operand 152 states and 186 transitions. Second operand has 15 states, 15 states have (on average 2.066666666666667) internal successors, (31), 14 states have internal predecessors, (31), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:43,517 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:51:43,517 INFO L93 Difference]: Finished difference Result 308 states and 375 transitions. [2022-02-24 03:51:43,517 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-02-24 03:51:43,518 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.066666666666667) internal successors, (31), 14 states have internal predecessors, (31), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 37 [2022-02-24 03:51:43,518 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:51:43,520 INFO L225 Difference]: With dead ends: 308 [2022-02-24 03:51:43,520 INFO L226 Difference]: Without dead ends: 182 [2022-02-24 03:51:43,520 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 14 SyntacticMatches, 7 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 103 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=80, Invalid=262, Unknown=0, NotChecked=0, Total=342 [2022-02-24 03:51:43,521 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 47 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 457 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 469 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 457 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-02-24 03:51:43,521 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 42 Invalid, 469 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 457 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-02-24 03:51:43,521 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2022-02-24 03:51:43,548 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 152. [2022-02-24 03:51:43,549 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 152 states, 142 states have (on average 1.232394366197183) internal successors, (175), 142 states have internal predecessors, (175), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:51:43,549 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 186 transitions. [2022-02-24 03:51:43,549 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 186 transitions. Word has length 37 [2022-02-24 03:51:43,549 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:51:43,549 INFO L470 AbstractCegarLoop]: Abstraction has 152 states and 186 transitions. [2022-02-24 03:51:43,549 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 2.066666666666667) internal successors, (31), 14 states have internal predecessors, (31), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:43,550 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 186 transitions. [2022-02-24 03:51:43,550 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-02-24 03:51:43,550 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:51:43,550 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:51:43,550 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2022-02-24 03:51:43,550 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:51:43,550 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:51:43,550 INFO L85 PathProgramCache]: Analyzing trace with hash 75399261, now seen corresponding path program 10 times [2022-02-24 03:51:43,550 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:51:43,551 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [832096166] [2022-02-24 03:51:43,551 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:51:43,551 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:51:43,582 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:51:43,692 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:51:43,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:43,757 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:51:43,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:43,761 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:51:43,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:43,763 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 03:51:43,922 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:51:43,922 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [832096166] [2022-02-24 03:51:43,922 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [832096166] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:51:43,922 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:51:43,922 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2022-02-24 03:51:43,922 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [878266227] [2022-02-24 03:51:43,922 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:51:43,922 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-02-24 03:51:43,922 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:51:43,923 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-02-24 03:51:43,923 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=234, Unknown=0, NotChecked=0, Total=306 [2022-02-24 03:51:43,923 INFO L87 Difference]: Start difference. First operand 152 states and 186 transitions. Second operand has 16 states, 16 states have (on average 1.9375) internal successors, (31), 15 states have internal predecessors, (31), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:44,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:51:44,134 INFO L93 Difference]: Finished difference Result 311 states and 384 transitions. [2022-02-24 03:51:44,135 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-02-24 03:51:44,135 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.9375) internal successors, (31), 15 states have internal predecessors, (31), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 37 [2022-02-24 03:51:44,135 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:51:44,136 INFO L225 Difference]: With dead ends: 311 [2022-02-24 03:51:44,136 INFO L226 Difference]: Without dead ends: 185 [2022-02-24 03:51:44,136 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 14 SyntacticMatches, 6 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 100 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=90, Invalid=290, Unknown=0, NotChecked=0, Total=380 [2022-02-24 03:51:44,137 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 55 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 394 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 408 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 394 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-02-24 03:51:44,137 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [56 Valid, 36 Invalid, 408 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 394 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-02-24 03:51:44,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 185 states. [2022-02-24 03:51:44,171 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 185 to 147. [2022-02-24 03:51:44,172 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 147 states, 137 states have (on average 1.2335766423357664) internal successors, (169), 138 states have internal predecessors, (169), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:51:44,172 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 180 transitions. [2022-02-24 03:51:44,172 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 180 transitions. Word has length 37 [2022-02-24 03:51:44,173 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:51:44,173 INFO L470 AbstractCegarLoop]: Abstraction has 147 states and 180 transitions. [2022-02-24 03:51:44,173 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 1.9375) internal successors, (31), 15 states have internal predecessors, (31), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:44,173 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 180 transitions. [2022-02-24 03:51:44,173 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-02-24 03:51:44,173 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:51:44,173 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:51:44,173 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2022-02-24 03:51:44,173 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:51:44,174 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:51:44,174 INFO L85 PathProgramCache]: Analyzing trace with hash -90141089, now seen corresponding path program 5 times [2022-02-24 03:51:44,174 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:51:44,174 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [563882597] [2022-02-24 03:51:44,174 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:51:44,174 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:51:44,207 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:51:44,242 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:51:44,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:44,347 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:51:44,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:44,351 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:51:44,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:44,353 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 03:51:44,575 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:51:44,575 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [563882597] [2022-02-24 03:51:44,575 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [563882597] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:51:44,575 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:51:44,576 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2022-02-24 03:51:44,576 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1603998016] [2022-02-24 03:51:44,576 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:51:44,576 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-02-24 03:51:44,576 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:51:44,576 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-02-24 03:51:44,576 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=340, Unknown=0, NotChecked=0, Total=420 [2022-02-24 03:51:44,576 INFO L87 Difference]: Start difference. First operand 147 states and 180 transitions. Second operand has 20 states, 20 states have (on average 1.55) internal successors, (31), 18 states have internal predecessors, (31), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:44,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:51:44,893 INFO L93 Difference]: Finished difference Result 328 states and 405 transitions. [2022-02-24 03:51:44,893 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-02-24 03:51:44,893 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.55) internal successors, (31), 18 states have internal predecessors, (31), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 37 [2022-02-24 03:51:44,893 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:51:44,894 INFO L225 Difference]: With dead ends: 328 [2022-02-24 03:51:44,894 INFO L226 Difference]: Without dead ends: 193 [2022-02-24 03:51:44,895 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 7 SyntacticMatches, 5 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 113 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=90, Invalid=416, Unknown=0, NotChecked=0, Total=506 [2022-02-24 03:51:44,895 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 54 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 684 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 693 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 684 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-02-24 03:51:44,895 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [55 Valid, 63 Invalid, 693 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 684 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-02-24 03:51:44,895 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193 states. [2022-02-24 03:51:44,923 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193 to 164. [2022-02-24 03:51:44,924 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 164 states, 154 states have (on average 1.2402597402597402) internal successors, (191), 154 states have internal predecessors, (191), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:51:44,924 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 164 states to 164 states and 202 transitions. [2022-02-24 03:51:44,924 INFO L78 Accepts]: Start accepts. Automaton has 164 states and 202 transitions. Word has length 37 [2022-02-24 03:51:44,924 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:51:44,924 INFO L470 AbstractCegarLoop]: Abstraction has 164 states and 202 transitions. [2022-02-24 03:51:44,924 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.55) internal successors, (31), 18 states have internal predecessors, (31), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:44,924 INFO L276 IsEmpty]: Start isEmpty. Operand 164 states and 202 transitions. [2022-02-24 03:51:44,925 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-02-24 03:51:44,925 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:51:44,925 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:51:44,925 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2022-02-24 03:51:44,925 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:51:44,925 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:51:44,925 INFO L85 PathProgramCache]: Analyzing trace with hash 589091326, now seen corresponding path program 6 times [2022-02-24 03:51:44,925 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:51:44,925 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [762876180] [2022-02-24 03:51:44,925 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:51:44,926 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:51:45,002 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:51:45,071 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:51:45,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:45,123 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:51:45,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:45,127 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:51:45,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:45,129 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 03:51:45,304 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:51:45,304 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [762876180] [2022-02-24 03:51:45,305 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [762876180] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:51:45,305 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:51:45,305 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2022-02-24 03:51:45,305 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1584479207] [2022-02-24 03:51:45,305 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:51:45,305 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-02-24 03:51:45,305 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:51:45,305 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-02-24 03:51:45,306 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=139, Unknown=0, NotChecked=0, Total=182 [2022-02-24 03:51:45,306 INFO L87 Difference]: Start difference. First operand 164 states and 202 transitions. Second operand has 13 states, 13 states have (on average 2.6153846153846154) internal successors, (34), 12 states have internal predecessors, (34), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:45,525 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:51:45,525 INFO L93 Difference]: Finished difference Result 347 states and 421 transitions. [2022-02-24 03:51:45,525 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-02-24 03:51:45,526 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.6153846153846154) internal successors, (34), 12 states have internal predecessors, (34), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 40 [2022-02-24 03:51:45,526 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:51:45,526 INFO L225 Difference]: With dead ends: 347 [2022-02-24 03:51:45,526 INFO L226 Difference]: Without dead ends: 212 [2022-02-24 03:51:45,527 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 15 SyntacticMatches, 12 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=47, Invalid=163, Unknown=0, NotChecked=0, Total=210 [2022-02-24 03:51:45,527 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 37 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 429 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 439 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 429 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-02-24 03:51:45,527 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 41 Invalid, 439 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 429 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-02-24 03:51:45,528 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 212 states. [2022-02-24 03:51:45,560 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 212 to 173. [2022-02-24 03:51:45,560 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 173 states, 163 states have (on average 1.2269938650306749) internal successors, (200), 163 states have internal predecessors, (200), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:51:45,560 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 211 transitions. [2022-02-24 03:51:45,560 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 211 transitions. Word has length 40 [2022-02-24 03:51:45,561 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:51:45,561 INFO L470 AbstractCegarLoop]: Abstraction has 173 states and 211 transitions. [2022-02-24 03:51:45,561 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.6153846153846154) internal successors, (34), 12 states have internal predecessors, (34), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:45,561 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 211 transitions. [2022-02-24 03:51:45,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-02-24 03:51:45,561 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:51:45,561 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:51:45,561 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2022-02-24 03:51:45,561 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:51:45,561 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:51:45,562 INFO L85 PathProgramCache]: Analyzing trace with hash 651130940, now seen corresponding path program 11 times [2022-02-24 03:51:45,562 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:51:45,562 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1520964042] [2022-02-24 03:51:45,562 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:51:45,562 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:51:45,666 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:51:45,774 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:51:45,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:45,845 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:51:45,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:45,856 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:51:45,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:45,858 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 03:51:46,040 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:51:46,040 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1520964042] [2022-02-24 03:51:46,040 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1520964042] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:51:46,040 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:51:46,040 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-02-24 03:51:46,040 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [612936492] [2022-02-24 03:51:46,040 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:51:46,040 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-02-24 03:51:46,041 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:51:46,041 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-02-24 03:51:46,041 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=189, Unknown=0, NotChecked=0, Total=240 [2022-02-24 03:51:46,041 INFO L87 Difference]: Start difference. First operand 173 states and 211 transitions. Second operand has 14 states, 14 states have (on average 2.4285714285714284) internal successors, (34), 13 states have internal predecessors, (34), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:46,294 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:51:46,294 INFO L93 Difference]: Finished difference Result 365 states and 439 transitions. [2022-02-24 03:51:46,294 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-02-24 03:51:46,295 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.4285714285714284) internal successors, (34), 13 states have internal predecessors, (34), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 40 [2022-02-24 03:51:46,295 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:51:46,295 INFO L225 Difference]: With dead ends: 365 [2022-02-24 03:51:46,295 INFO L226 Difference]: Without dead ends: 221 [2022-02-24 03:51:46,296 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 14 SyntacticMatches, 11 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=63, Invalid=243, Unknown=0, NotChecked=0, Total=306 [2022-02-24 03:51:46,296 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 44 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 403 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 413 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 403 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-02-24 03:51:46,296 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [45 Valid, 37 Invalid, 413 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 403 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-02-24 03:51:46,299 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 221 states. [2022-02-24 03:51:46,334 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 221 to 173. [2022-02-24 03:51:46,334 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 173 states, 163 states have (on average 1.2269938650306749) internal successors, (200), 163 states have internal predecessors, (200), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:51:46,335 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 211 transitions. [2022-02-24 03:51:46,335 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 211 transitions. Word has length 40 [2022-02-24 03:51:46,335 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:51:46,335 INFO L470 AbstractCegarLoop]: Abstraction has 173 states and 211 transitions. [2022-02-24 03:51:46,335 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.4285714285714284) internal successors, (34), 13 states have internal predecessors, (34), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:46,335 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 211 transitions. [2022-02-24 03:51:46,335 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-02-24 03:51:46,335 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:51:46,336 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:51:46,336 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2022-02-24 03:51:46,336 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:51:46,336 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:51:46,336 INFO L85 PathProgramCache]: Analyzing trace with hash -1154307394, now seen corresponding path program 12 times [2022-02-24 03:51:46,336 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:51:46,336 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [23111171] [2022-02-24 03:51:46,336 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:51:46,336 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:51:46,427 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:51:46,519 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:51:46,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:46,594 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:51:46,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:46,599 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:51:46,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:46,602 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 03:51:46,817 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:51:46,817 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [23111171] [2022-02-24 03:51:46,817 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [23111171] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:51:46,817 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:51:46,817 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-02-24 03:51:46,817 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1334154307] [2022-02-24 03:51:46,817 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:51:46,817 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-02-24 03:51:46,817 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:51:46,818 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-02-24 03:51:46,818 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=213, Unknown=0, NotChecked=0, Total=272 [2022-02-24 03:51:46,818 INFO L87 Difference]: Start difference. First operand 173 states and 211 transitions. Second operand has 15 states, 15 states have (on average 2.2666666666666666) internal successors, (34), 14 states have internal predecessors, (34), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:47,085 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:51:47,085 INFO L93 Difference]: Finished difference Result 359 states and 433 transitions. [2022-02-24 03:51:47,085 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-02-24 03:51:47,086 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.2666666666666666) internal successors, (34), 14 states have internal predecessors, (34), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 40 [2022-02-24 03:51:47,086 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:51:47,086 INFO L225 Difference]: With dead ends: 359 [2022-02-24 03:51:47,086 INFO L226 Difference]: Without dead ends: 215 [2022-02-24 03:51:47,087 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 14 SyntacticMatches, 10 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 118 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=73, Invalid=269, Unknown=0, NotChecked=0, Total=342 [2022-02-24 03:51:47,087 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 46 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 465 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 476 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 465 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-02-24 03:51:47,087 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [47 Valid, 38 Invalid, 476 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 465 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-02-24 03:51:47,088 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 215 states. [2022-02-24 03:51:47,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 215 to 173. [2022-02-24 03:51:47,124 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 173 states, 163 states have (on average 1.2269938650306749) internal successors, (200), 163 states have internal predecessors, (200), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:51:47,125 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 211 transitions. [2022-02-24 03:51:47,125 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 211 transitions. Word has length 40 [2022-02-24 03:51:47,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:51:47,125 INFO L470 AbstractCegarLoop]: Abstraction has 173 states and 211 transitions. [2022-02-24 03:51:47,125 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 2.2666666666666666) internal successors, (34), 14 states have internal predecessors, (34), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:47,125 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 211 transitions. [2022-02-24 03:51:47,126 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-02-24 03:51:47,126 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:51:47,126 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:51:47,126 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2022-02-24 03:51:47,126 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:51:47,126 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:51:47,126 INFO L85 PathProgramCache]: Analyzing trace with hash -1971955844, now seen corresponding path program 13 times [2022-02-24 03:51:47,126 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:51:47,126 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1461745398] [2022-02-24 03:51:47,126 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:51:47,127 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:51:47,224 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:51:47,315 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:51:47,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:47,374 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:51:47,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:47,377 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:51:47,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:47,379 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 03:51:47,566 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:51:47,566 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1461745398] [2022-02-24 03:51:47,566 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1461745398] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:51:47,566 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:51:47,566 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2022-02-24 03:51:47,566 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [729905636] [2022-02-24 03:51:47,566 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:51:47,566 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-02-24 03:51:47,566 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:51:47,566 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-02-24 03:51:47,567 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=239, Unknown=0, NotChecked=0, Total=306 [2022-02-24 03:51:47,567 INFO L87 Difference]: Start difference. First operand 173 states and 211 transitions. Second operand has 16 states, 16 states have (on average 2.125) internal successors, (34), 15 states have internal predecessors, (34), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:47,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:51:47,812 INFO L93 Difference]: Finished difference Result 353 states and 427 transitions. [2022-02-24 03:51:47,815 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-02-24 03:51:47,815 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.125) internal successors, (34), 15 states have internal predecessors, (34), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 40 [2022-02-24 03:51:47,815 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:51:47,816 INFO L225 Difference]: With dead ends: 353 [2022-02-24 03:51:47,816 INFO L226 Difference]: Without dead ends: 209 [2022-02-24 03:51:47,816 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 14 SyntacticMatches, 9 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 130 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=83, Invalid=297, Unknown=0, NotChecked=0, Total=380 [2022-02-24 03:51:47,817 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 51 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 442 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 454 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 442 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-02-24 03:51:47,817 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [52 Valid, 36 Invalid, 454 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 442 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-02-24 03:51:47,817 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2022-02-24 03:51:47,854 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 173. [2022-02-24 03:51:47,855 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 173 states, 163 states have (on average 1.2269938650306749) internal successors, (200), 163 states have internal predecessors, (200), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:51:47,855 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 211 transitions. [2022-02-24 03:51:47,855 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 211 transitions. Word has length 40 [2022-02-24 03:51:47,855 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:51:47,855 INFO L470 AbstractCegarLoop]: Abstraction has 173 states and 211 transitions. [2022-02-24 03:51:47,856 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 2.125) internal successors, (34), 15 states have internal predecessors, (34), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:47,856 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 211 transitions. [2022-02-24 03:51:47,856 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-02-24 03:51:47,856 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:51:47,856 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:51:47,856 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2022-02-24 03:51:47,856 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:51:47,856 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:51:47,856 INFO L85 PathProgramCache]: Analyzing trace with hash 734663550, now seen corresponding path program 14 times [2022-02-24 03:51:47,856 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:51:47,856 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1183303672] [2022-02-24 03:51:47,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:51:47,857 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:51:47,952 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:51:48,044 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:51:48,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:48,106 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:51:48,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:48,116 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:51:48,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:48,120 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 03:51:48,322 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:51:48,322 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1183303672] [2022-02-24 03:51:48,322 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1183303672] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:51:48,322 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:51:48,322 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2022-02-24 03:51:48,322 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [243135783] [2022-02-24 03:51:48,322 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:51:48,322 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-02-24 03:51:48,323 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:51:48,323 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-02-24 03:51:48,323 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=267, Unknown=0, NotChecked=0, Total=342 [2022-02-24 03:51:48,323 INFO L87 Difference]: Start difference. First operand 173 states and 211 transitions. Second operand has 17 states, 17 states have (on average 2.0) internal successors, (34), 16 states have internal predecessors, (34), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:48,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:51:48,573 INFO L93 Difference]: Finished difference Result 350 states and 424 transitions. [2022-02-24 03:51:48,573 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-02-24 03:51:48,573 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0) internal successors, (34), 16 states have internal predecessors, (34), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 40 [2022-02-24 03:51:48,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:51:48,574 INFO L225 Difference]: With dead ends: 350 [2022-02-24 03:51:48,574 INFO L226 Difference]: Without dead ends: 206 [2022-02-24 03:51:48,574 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 14 SyntacticMatches, 8 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 133 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=93, Invalid=327, Unknown=0, NotChecked=0, Total=420 [2022-02-24 03:51:48,575 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 60 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 445 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 458 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 445 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-02-24 03:51:48,575 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [61 Valid, 36 Invalid, 458 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 445 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-02-24 03:51:48,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 206 states. [2022-02-24 03:51:48,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 206 to 173. [2022-02-24 03:51:48,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 173 states, 163 states have (on average 1.2269938650306749) internal successors, (200), 163 states have internal predecessors, (200), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:51:48,620 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 211 transitions. [2022-02-24 03:51:48,620 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 211 transitions. Word has length 40 [2022-02-24 03:51:48,620 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:51:48,620 INFO L470 AbstractCegarLoop]: Abstraction has 173 states and 211 transitions. [2022-02-24 03:51:48,620 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.0) internal successors, (34), 16 states have internal predecessors, (34), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:48,620 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 211 transitions. [2022-02-24 03:51:48,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-02-24 03:51:48,621 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:51:48,621 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:51:48,621 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2022-02-24 03:51:48,621 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:51:48,621 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:51:48,621 INFO L85 PathProgramCache]: Analyzing trace with hash -276453700, now seen corresponding path program 15 times [2022-02-24 03:51:48,621 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:51:48,621 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1980502562] [2022-02-24 03:51:48,621 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:51:48,622 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:51:48,665 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:51:48,762 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:51:48,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:48,833 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:51:48,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:48,836 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:51:48,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:48,839 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 03:51:49,028 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:51:49,028 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1980502562] [2022-02-24 03:51:49,028 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1980502562] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:51:49,028 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:51:49,028 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2022-02-24 03:51:49,028 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [224385348] [2022-02-24 03:51:49,028 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:51:49,029 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-02-24 03:51:49,029 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:51:49,029 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-02-24 03:51:49,029 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=297, Unknown=0, NotChecked=0, Total=380 [2022-02-24 03:51:49,029 INFO L87 Difference]: Start difference. First operand 173 states and 211 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 17 states have internal predecessors, (34), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:49,327 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:51:49,327 INFO L93 Difference]: Finished difference Result 353 states and 433 transitions. [2022-02-24 03:51:49,327 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-02-24 03:51:49,327 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 17 states have internal predecessors, (34), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 40 [2022-02-24 03:51:49,327 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:51:49,328 INFO L225 Difference]: With dead ends: 353 [2022-02-24 03:51:49,328 INFO L226 Difference]: Without dead ends: 209 [2022-02-24 03:51:49,330 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 14 SyntacticMatches, 7 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 127 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=103, Invalid=359, Unknown=0, NotChecked=0, Total=462 [2022-02-24 03:51:49,330 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 62 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 566 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 581 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 566 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-02-24 03:51:49,330 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [63 Valid, 41 Invalid, 581 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 566 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-02-24 03:51:49,331 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2022-02-24 03:51:49,375 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 165. [2022-02-24 03:51:49,376 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 165 states, 155 states have (on average 1.2258064516129032) internal successors, (190), 156 states have internal predecessors, (190), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:51:49,377 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 165 states to 165 states and 201 transitions. [2022-02-24 03:51:49,377 INFO L78 Accepts]: Start accepts. Automaton has 165 states and 201 transitions. Word has length 40 [2022-02-24 03:51:49,377 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:51:49,377 INFO L470 AbstractCegarLoop]: Abstraction has 165 states and 201 transitions. [2022-02-24 03:51:49,377 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 17 states have internal predecessors, (34), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:49,377 INFO L276 IsEmpty]: Start isEmpty. Operand 165 states and 201 transitions. [2022-02-24 03:51:49,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-02-24 03:51:49,377 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:51:49,378 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:51:49,378 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2022-02-24 03:51:49,378 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:51:49,378 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:51:49,378 INFO L85 PathProgramCache]: Analyzing trace with hash -441994050, now seen corresponding path program 6 times [2022-02-24 03:51:49,378 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:51:49,378 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [943381216] [2022-02-24 03:51:49,378 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:51:49,379 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:51:49,407 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:51:49,447 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:51:49,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:49,477 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:51:49,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:49,481 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:51:49,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:49,483 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 03:51:49,677 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:51:49,677 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [943381216] [2022-02-24 03:51:49,677 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [943381216] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:51:49,677 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:51:49,677 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2022-02-24 03:51:49,677 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [756362957] [2022-02-24 03:51:49,678 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:51:49,678 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-02-24 03:51:49,678 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:51:49,678 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-02-24 03:51:49,678 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=252, Unknown=0, NotChecked=0, Total=306 [2022-02-24 03:51:49,678 INFO L87 Difference]: Start difference. First operand 165 states and 201 transitions. Second operand has 17 states, 17 states have (on average 2.0) internal successors, (34), 16 states have internal predecessors, (34), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:49,960 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:51:49,961 INFO L93 Difference]: Finished difference Result 349 states and 427 transitions. [2022-02-24 03:51:49,961 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-02-24 03:51:49,961 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0) internal successors, (34), 16 states have internal predecessors, (34), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 40 [2022-02-24 03:51:49,961 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:51:49,968 INFO L225 Difference]: With dead ends: 349 [2022-02-24 03:51:49,968 INFO L226 Difference]: Without dead ends: 196 [2022-02-24 03:51:49,969 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 13 SyntacticMatches, 7 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=58, Invalid=284, Unknown=0, NotChecked=0, Total=342 [2022-02-24 03:51:49,969 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 49 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 614 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 619 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 614 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-02-24 03:51:49,969 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [50 Valid, 40 Invalid, 619 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 614 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-02-24 03:51:49,969 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2022-02-24 03:51:50,009 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 171. [2022-02-24 03:51:50,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 171 states, 161 states have (on average 1.2173913043478262) internal successors, (196), 162 states have internal predecessors, (196), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:51:50,009 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 207 transitions. [2022-02-24 03:51:50,010 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 207 transitions. Word has length 40 [2022-02-24 03:51:50,010 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:51:50,010 INFO L470 AbstractCegarLoop]: Abstraction has 171 states and 207 transitions. [2022-02-24 03:51:50,010 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.0) internal successors, (34), 16 states have internal predecessors, (34), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:50,010 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 207 transitions. [2022-02-24 03:51:50,010 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-02-24 03:51:50,010 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:51:50,010 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:51:50,010 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2022-02-24 03:51:50,010 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:51:50,011 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:51:50,011 INFO L85 PathProgramCache]: Analyzing trace with hash 1166496317, now seen corresponding path program 7 times [2022-02-24 03:51:50,011 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:51:50,011 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2121518381] [2022-02-24 03:51:50,011 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:51:50,011 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:51:50,073 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:51:50,137 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:51:50,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:50,183 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:51:50,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:50,189 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:51:50,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:50,191 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 03:51:50,402 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:51:50,402 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2121518381] [2022-02-24 03:51:50,402 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [2121518381] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:51:50,402 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:51:50,402 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2022-02-24 03:51:50,402 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [679148576] [2022-02-24 03:51:50,403 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:51:50,403 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-02-24 03:51:50,403 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:51:50,403 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-02-24 03:51:50,403 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=163, Unknown=0, NotChecked=0, Total=210 [2022-02-24 03:51:50,403 INFO L87 Difference]: Start difference. First operand 171 states and 207 transitions. Second operand has 14 states, 14 states have (on average 2.642857142857143) internal successors, (37), 13 states have internal predecessors, (37), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:50,673 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:51:50,673 INFO L93 Difference]: Finished difference Result 388 states and 463 transitions. [2022-02-24 03:51:50,673 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-02-24 03:51:50,673 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.642857142857143) internal successors, (37), 13 states have internal predecessors, (37), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 43 [2022-02-24 03:51:50,673 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:51:50,674 INFO L225 Difference]: With dead ends: 388 [2022-02-24 03:51:50,674 INFO L226 Difference]: Without dead ends: 229 [2022-02-24 03:51:50,674 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 15 SyntacticMatches, 14 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=51, Invalid=189, Unknown=0, NotChecked=0, Total=240 [2022-02-24 03:51:50,675 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 39 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 553 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 563 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 553 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-02-24 03:51:50,675 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 43 Invalid, 563 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 553 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-02-24 03:51:50,675 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 229 states. [2022-02-24 03:51:50,726 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 229 to 180. [2022-02-24 03:51:50,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 180 states, 170 states have (on average 1.2058823529411764) internal successors, (205), 171 states have internal predecessors, (205), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:51:50,727 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 216 transitions. [2022-02-24 03:51:50,727 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 216 transitions. Word has length 43 [2022-02-24 03:51:50,727 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:51:50,728 INFO L470 AbstractCegarLoop]: Abstraction has 180 states and 216 transitions. [2022-02-24 03:51:50,728 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.642857142857143) internal successors, (37), 13 states have internal predecessors, (37), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:50,728 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 216 transitions. [2022-02-24 03:51:50,728 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-02-24 03:51:50,728 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:51:50,728 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:51:50,728 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2022-02-24 03:51:50,728 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:51:50,729 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:51:50,729 INFO L85 PathProgramCache]: Analyzing trace with hash -1742267585, now seen corresponding path program 16 times [2022-02-24 03:51:50,729 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:51:50,729 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2059087160] [2022-02-24 03:51:50,729 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:51:50,729 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:51:50,826 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:51:50,934 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:51:50,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:50,997 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:51:50,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:51,001 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:51:51,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:51,003 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 03:51:51,229 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:51:51,229 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2059087160] [2022-02-24 03:51:51,229 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [2059087160] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:51:51,229 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:51:51,229 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-02-24 03:51:51,229 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1382800777] [2022-02-24 03:51:51,229 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:51:51,230 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-02-24 03:51:51,230 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:51:51,230 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-02-24 03:51:51,230 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=218, Unknown=0, NotChecked=0, Total=272 [2022-02-24 03:51:51,230 INFO L87 Difference]: Start difference. First operand 180 states and 216 transitions. Second operand has 15 states, 15 states have (on average 2.466666666666667) internal successors, (37), 14 states have internal predecessors, (37), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:51,527 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:51:51,527 INFO L93 Difference]: Finished difference Result 406 states and 481 transitions. [2022-02-24 03:51:51,527 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-02-24 03:51:51,527 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.466666666666667) internal successors, (37), 14 states have internal predecessors, (37), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 43 [2022-02-24 03:51:51,527 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:51:51,528 INFO L225 Difference]: With dead ends: 406 [2022-02-24 03:51:51,528 INFO L226 Difference]: Without dead ends: 238 [2022-02-24 03:51:51,528 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 14 SyntacticMatches, 13 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 112 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=66, Invalid=276, Unknown=0, NotChecked=0, Total=342 [2022-02-24 03:51:51,529 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 44 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 576 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 586 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 576 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-02-24 03:51:51,529 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [45 Valid, 43 Invalid, 586 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 576 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-02-24 03:51:51,529 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 238 states. [2022-02-24 03:51:51,600 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 238 to 180. [2022-02-24 03:51:51,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 180 states, 170 states have (on average 1.2058823529411764) internal successors, (205), 171 states have internal predecessors, (205), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:51:51,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 216 transitions. [2022-02-24 03:51:51,601 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 216 transitions. Word has length 43 [2022-02-24 03:51:51,601 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:51:51,601 INFO L470 AbstractCegarLoop]: Abstraction has 180 states and 216 transitions. [2022-02-24 03:51:51,601 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 2.466666666666667) internal successors, (37), 14 states have internal predecessors, (37), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:51,601 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 216 transitions. [2022-02-24 03:51:51,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-02-24 03:51:51,601 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:51:51,601 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:51:51,601 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2022-02-24 03:51:51,601 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:51:51,602 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:51:51,602 INFO L85 PathProgramCache]: Analyzing trace with hash -1680227971, now seen corresponding path program 17 times [2022-02-24 03:51:51,602 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:51:51,602 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1050461187] [2022-02-24 03:51:51,602 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:51:51,602 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:51:51,711 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:51:51,812 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:51:51,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:51,881 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:51:51,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:51,885 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:51:51,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:51,887 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 03:51:52,122 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:51:52,123 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1050461187] [2022-02-24 03:51:52,123 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1050461187] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:51:52,123 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:51:52,123 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2022-02-24 03:51:52,123 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1842458233] [2022-02-24 03:51:52,123 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:51:52,124 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-02-24 03:51:52,124 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:51:52,124 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-02-24 03:51:52,124 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=244, Unknown=0, NotChecked=0, Total=306 [2022-02-24 03:51:52,125 INFO L87 Difference]: Start difference. First operand 180 states and 216 transitions. Second operand has 16 states, 16 states have (on average 2.3125) internal successors, (37), 15 states have internal predecessors, (37), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:52,454 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:51:52,454 INFO L93 Difference]: Finished difference Result 400 states and 475 transitions. [2022-02-24 03:51:52,454 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-02-24 03:51:52,454 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.3125) internal successors, (37), 15 states have internal predecessors, (37), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 43 [2022-02-24 03:51:52,455 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:51:52,455 INFO L225 Difference]: With dead ends: 400 [2022-02-24 03:51:52,455 INFO L226 Difference]: Without dead ends: 232 [2022-02-24 03:51:52,456 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 14 SyntacticMatches, 12 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 139 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=76, Invalid=304, Unknown=0, NotChecked=0, Total=380 [2022-02-24 03:51:52,456 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 46 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 547 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 558 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 547 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-02-24 03:51:52,457 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [47 Valid, 37 Invalid, 558 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 547 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-02-24 03:51:52,457 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 232 states. [2022-02-24 03:51:52,518 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 232 to 180. [2022-02-24 03:51:52,518 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 180 states, 170 states have (on average 1.2058823529411764) internal successors, (205), 171 states have internal predecessors, (205), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:51:52,518 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 216 transitions. [2022-02-24 03:51:52,519 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 216 transitions. Word has length 43 [2022-02-24 03:51:52,519 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:51:52,519 INFO L470 AbstractCegarLoop]: Abstraction has 180 states and 216 transitions. [2022-02-24 03:51:52,519 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 2.3125) internal successors, (37), 15 states have internal predecessors, (37), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:52,519 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 216 transitions. [2022-02-24 03:51:52,519 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-02-24 03:51:52,519 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:51:52,519 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:51:52,519 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2022-02-24 03:51:52,519 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:51:52,520 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:51:52,520 INFO L85 PathProgramCache]: Analyzing trace with hash 809300991, now seen corresponding path program 18 times [2022-02-24 03:51:52,520 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:51:52,520 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1125520022] [2022-02-24 03:51:52,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:51:52,521 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:51:52,614 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:51:52,710 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:51:52,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:52,861 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:51:52,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:52,864 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:51:52,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:52,867 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 03:51:53,117 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:51:53,117 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1125520022] [2022-02-24 03:51:53,117 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1125520022] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:51:53,117 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:51:53,117 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2022-02-24 03:51:53,117 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [862401966] [2022-02-24 03:51:53,117 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:51:53,117 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-02-24 03:51:53,117 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:51:53,118 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-02-24 03:51:53,118 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=272, Unknown=0, NotChecked=0, Total=342 [2022-02-24 03:51:53,118 INFO L87 Difference]: Start difference. First operand 180 states and 216 transitions. Second operand has 17 states, 17 states have (on average 2.176470588235294) internal successors, (37), 16 states have internal predecessors, (37), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:53,423 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:51:53,423 INFO L93 Difference]: Finished difference Result 394 states and 469 transitions. [2022-02-24 03:51:53,423 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-02-24 03:51:53,423 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.176470588235294) internal successors, (37), 16 states have internal predecessors, (37), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 43 [2022-02-24 03:51:53,424 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:51:53,424 INFO L225 Difference]: With dead ends: 394 [2022-02-24 03:51:53,424 INFO L226 Difference]: Without dead ends: 226 [2022-02-24 03:51:53,425 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 14 SyntacticMatches, 11 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 157 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=86, Invalid=334, Unknown=0, NotChecked=0, Total=420 [2022-02-24 03:51:53,425 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 54 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 493 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 505 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 493 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-02-24 03:51:53,425 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [55 Valid, 38 Invalid, 505 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 493 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-02-24 03:51:53,425 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 226 states. [2022-02-24 03:51:53,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 226 to 180. [2022-02-24 03:51:53,482 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 180 states, 170 states have (on average 1.2058823529411764) internal successors, (205), 171 states have internal predecessors, (205), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:51:53,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 216 transitions. [2022-02-24 03:51:53,483 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 216 transitions. Word has length 43 [2022-02-24 03:51:53,483 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:51:53,483 INFO L470 AbstractCegarLoop]: Abstraction has 180 states and 216 transitions. [2022-02-24 03:51:53,483 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.176470588235294) internal successors, (37), 16 states have internal predecessors, (37), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:53,483 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 216 transitions. [2022-02-24 03:51:53,483 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-02-24 03:51:53,483 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:51:53,483 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:51:53,483 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2022-02-24 03:51:53,483 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:51:53,484 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:51:53,484 INFO L85 PathProgramCache]: Analyzing trace with hash -8347459, now seen corresponding path program 19 times [2022-02-24 03:51:53,484 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:51:53,484 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [192154589] [2022-02-24 03:51:53,484 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:51:53,484 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:51:53,591 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:51:53,687 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:51:53,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:53,781 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:51:53,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:53,785 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:51:53,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:53,787 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 03:51:54,018 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:51:54,018 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [192154589] [2022-02-24 03:51:54,018 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [192154589] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:51:54,018 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:51:54,018 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2022-02-24 03:51:54,018 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1674869928] [2022-02-24 03:51:54,018 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:51:54,019 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-02-24 03:51:54,019 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:51:54,019 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-02-24 03:51:54,019 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=302, Unknown=0, NotChecked=0, Total=380 [2022-02-24 03:51:54,019 INFO L87 Difference]: Start difference. First operand 180 states and 216 transitions. Second operand has 18 states, 18 states have (on average 2.0555555555555554) internal successors, (37), 17 states have internal predecessors, (37), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:54,354 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:51:54,354 INFO L93 Difference]: Finished difference Result 388 states and 463 transitions. [2022-02-24 03:51:54,354 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-02-24 03:51:54,354 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0555555555555554) internal successors, (37), 17 states have internal predecessors, (37), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 43 [2022-02-24 03:51:54,354 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:51:54,355 INFO L225 Difference]: With dead ends: 388 [2022-02-24 03:51:54,355 INFO L226 Difference]: Without dead ends: 220 [2022-02-24 03:51:54,355 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 14 SyntacticMatches, 10 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 166 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=96, Invalid=366, Unknown=0, NotChecked=0, Total=462 [2022-02-24 03:51:54,356 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 56 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 580 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 593 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 580 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-02-24 03:51:54,356 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [57 Valid, 42 Invalid, 593 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 580 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-02-24 03:51:54,356 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 220 states. [2022-02-24 03:51:54,414 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 220 to 180. [2022-02-24 03:51:54,415 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 180 states, 170 states have (on average 1.2058823529411764) internal successors, (205), 171 states have internal predecessors, (205), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:51:54,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 216 transitions. [2022-02-24 03:51:54,415 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 216 transitions. Word has length 43 [2022-02-24 03:51:54,415 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:51:54,415 INFO L470 AbstractCegarLoop]: Abstraction has 180 states and 216 transitions. [2022-02-24 03:51:54,415 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 2.0555555555555554) internal successors, (37), 17 states have internal predecessors, (37), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:54,415 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 216 transitions. [2022-02-24 03:51:54,416 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-02-24 03:51:54,416 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:51:54,416 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:51:54,416 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2022-02-24 03:51:54,416 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:51:54,416 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:51:54,416 INFO L85 PathProgramCache]: Analyzing trace with hash -1596695361, now seen corresponding path program 20 times [2022-02-24 03:51:54,416 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:51:54,416 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [474887814] [2022-02-24 03:51:54,416 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:51:54,417 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:51:54,519 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:51:54,613 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:51:54,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:54,688 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:51:54,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:54,700 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:51:54,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:54,702 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 03:51:54,952 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:51:54,952 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [474887814] [2022-02-24 03:51:54,952 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [474887814] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:51:54,952 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:51:54,952 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2022-02-24 03:51:54,952 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [527822740] [2022-02-24 03:51:54,952 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:51:54,953 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-02-24 03:51:54,953 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:51:54,954 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-02-24 03:51:54,954 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=334, Unknown=0, NotChecked=0, Total=420 [2022-02-24 03:51:54,954 INFO L87 Difference]: Start difference. First operand 180 states and 216 transitions. Second operand has 19 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 18 states have internal predecessors, (37), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:55,285 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:51:55,286 INFO L93 Difference]: Finished difference Result 382 states and 457 transitions. [2022-02-24 03:51:55,286 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-02-24 03:51:55,286 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 18 states have internal predecessors, (37), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 43 [2022-02-24 03:51:55,286 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:51:55,287 INFO L225 Difference]: With dead ends: 382 [2022-02-24 03:51:55,287 INFO L226 Difference]: Without dead ends: 214 [2022-02-24 03:51:55,287 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 14 SyntacticMatches, 9 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 166 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=106, Invalid=400, Unknown=0, NotChecked=0, Total=506 [2022-02-24 03:51:55,288 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 64 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 577 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 591 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 577 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-02-24 03:51:55,288 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [65 Valid, 38 Invalid, 591 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 577 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-02-24 03:51:55,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 214 states. [2022-02-24 03:51:55,356 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 214 to 180. [2022-02-24 03:51:55,356 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 180 states, 170 states have (on average 1.2058823529411764) internal successors, (205), 171 states have internal predecessors, (205), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:51:55,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 216 transitions. [2022-02-24 03:51:55,357 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 216 transitions. Word has length 43 [2022-02-24 03:51:55,357 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:51:55,357 INFO L470 AbstractCegarLoop]: Abstraction has 180 states and 216 transitions. [2022-02-24 03:51:55,357 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 18 states have internal predecessors, (37), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:55,357 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 216 transitions. [2022-02-24 03:51:55,357 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-02-24 03:51:55,357 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:51:55,357 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:51:55,357 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2022-02-24 03:51:55,357 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:51:55,358 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:51:55,358 INFO L85 PathProgramCache]: Analyzing trace with hash 1687154685, now seen corresponding path program 21 times [2022-02-24 03:51:55,358 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:51:55,358 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [953972911] [2022-02-24 03:51:55,358 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:51:55,358 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:51:55,391 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:51:55,486 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:51:55,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:55,551 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:51:55,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:55,564 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:51:55,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:55,566 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 03:51:55,820 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:51:55,820 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [953972911] [2022-02-24 03:51:55,820 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [953972911] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:51:55,820 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:51:55,820 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2022-02-24 03:51:55,820 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2099045390] [2022-02-24 03:51:55,820 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:51:55,821 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-02-24 03:51:55,821 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:51:55,821 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-02-24 03:51:55,821 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=368, Unknown=0, NotChecked=0, Total=462 [2022-02-24 03:51:55,821 INFO L87 Difference]: Start difference. First operand 180 states and 216 transitions. Second operand has 20 states, 20 states have (on average 1.85) internal successors, (37), 19 states have internal predecessors, (37), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:56,186 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:51:56,186 INFO L93 Difference]: Finished difference Result 382 states and 460 transitions. [2022-02-24 03:51:56,186 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-02-24 03:51:56,186 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.85) internal successors, (37), 19 states have internal predecessors, (37), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 43 [2022-02-24 03:51:56,187 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:51:56,187 INFO L225 Difference]: With dead ends: 382 [2022-02-24 03:51:56,187 INFO L226 Difference]: Without dead ends: 214 [2022-02-24 03:51:56,188 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 14 SyntacticMatches, 8 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 157 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=116, Invalid=436, Unknown=0, NotChecked=0, Total=552 [2022-02-24 03:51:56,188 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 62 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 748 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 763 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 748 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-02-24 03:51:56,188 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [63 Valid, 46 Invalid, 763 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 748 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-02-24 03:51:56,189 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 214 states. [2022-02-24 03:51:56,255 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 214 to 183. [2022-02-24 03:51:56,256 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 183 states, 173 states have (on average 1.2196531791907514) internal successors, (211), 174 states have internal predecessors, (211), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:51:56,256 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 222 transitions. [2022-02-24 03:51:56,256 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 222 transitions. Word has length 43 [2022-02-24 03:51:56,256 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:51:56,256 INFO L470 AbstractCegarLoop]: Abstraction has 183 states and 222 transitions. [2022-02-24 03:51:56,256 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.85) internal successors, (37), 19 states have internal predecessors, (37), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:56,256 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 222 transitions. [2022-02-24 03:51:56,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-02-24 03:51:56,257 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:51:56,257 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:51:56,257 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2022-02-24 03:51:56,257 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:51:56,257 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:51:56,257 INFO L85 PathProgramCache]: Analyzing trace with hash 1521614335, now seen corresponding path program 7 times [2022-02-24 03:51:56,257 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:51:56,257 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1270760058] [2022-02-24 03:51:56,257 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:51:56,258 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:51:56,288 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:51:56,318 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:51:56,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:56,344 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:51:56,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:56,355 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:51:56,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:56,357 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 03:51:56,570 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:51:56,571 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1270760058] [2022-02-24 03:51:56,571 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1270760058] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:51:56,571 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:51:56,571 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2022-02-24 03:51:56,571 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [714998103] [2022-02-24 03:51:56,571 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:51:56,571 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-02-24 03:51:56,571 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:51:56,572 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-02-24 03:51:56,572 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=319, Unknown=0, NotChecked=0, Total=380 [2022-02-24 03:51:56,572 INFO L87 Difference]: Start difference. First operand 183 states and 222 transitions. Second operand has 19 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 18 states have internal predecessors, (37), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:56,958 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:51:56,959 INFO L93 Difference]: Finished difference Result 388 states and 472 transitions. [2022-02-24 03:51:56,960 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-02-24 03:51:56,960 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 18 states have internal predecessors, (37), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 43 [2022-02-24 03:51:56,961 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:51:56,961 INFO L225 Difference]: With dead ends: 388 [2022-02-24 03:51:56,961 INFO L226 Difference]: Without dead ends: 217 [2022-02-24 03:51:56,962 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 13 SyntacticMatches, 8 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=65, Invalid=355, Unknown=0, NotChecked=0, Total=420 [2022-02-24 03:51:56,962 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 57 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 854 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 859 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 854 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-02-24 03:51:56,962 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [58 Valid, 38 Invalid, 859 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 854 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-02-24 03:51:56,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 217 states. [2022-02-24 03:51:57,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 217 to 189. [2022-02-24 03:51:57,032 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 189 states, 179 states have (on average 1.2122905027932962) internal successors, (217), 180 states have internal predecessors, (217), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:51:57,032 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 189 states to 189 states and 228 transitions. [2022-02-24 03:51:57,033 INFO L78 Accepts]: Start accepts. Automaton has 189 states and 228 transitions. Word has length 43 [2022-02-24 03:51:57,033 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:51:57,033 INFO L470 AbstractCegarLoop]: Abstraction has 189 states and 228 transitions. [2022-02-24 03:51:57,033 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 18 states have internal predecessors, (37), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:57,033 INFO L276 IsEmpty]: Start isEmpty. Operand 189 states and 228 transitions. [2022-02-24 03:51:57,033 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-02-24 03:51:57,033 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:51:57,033 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:51:57,033 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2022-02-24 03:51:57,034 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:51:57,034 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:51:57,034 INFO L85 PathProgramCache]: Analyzing trace with hash 1294562718, now seen corresponding path program 8 times [2022-02-24 03:51:57,034 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:51:57,034 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1569745903] [2022-02-24 03:51:57,034 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:51:57,034 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:51:57,112 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:51:57,180 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:51:57,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:57,225 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:51:57,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:57,228 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:51:57,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:57,230 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 03:51:57,449 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:51:57,449 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1569745903] [2022-02-24 03:51:57,449 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1569745903] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:51:57,449 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:51:57,449 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-02-24 03:51:57,449 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1853208313] [2022-02-24 03:51:57,449 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:51:57,449 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-02-24 03:51:57,449 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:51:57,450 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-02-24 03:51:57,450 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=189, Unknown=0, NotChecked=0, Total=240 [2022-02-24 03:51:57,450 INFO L87 Difference]: Start difference. First operand 189 states and 228 transitions. Second operand has 15 states, 15 states have (on average 2.6666666666666665) internal successors, (40), 14 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:57,774 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:51:57,775 INFO L93 Difference]: Finished difference Result 433 states and 514 transitions. [2022-02-24 03:51:57,775 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-02-24 03:51:57,775 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.6666666666666665) internal successors, (40), 14 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 46 [2022-02-24 03:51:57,775 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:51:57,776 INFO L225 Difference]: With dead ends: 433 [2022-02-24 03:51:57,776 INFO L226 Difference]: Without dead ends: 256 [2022-02-24 03:51:57,776 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 15 SyntacticMatches, 16 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 62 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2022-02-24 03:51:57,776 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 39 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 640 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 650 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 640 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-02-24 03:51:57,777 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 39 Invalid, 650 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 640 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-02-24 03:51:57,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 256 states. [2022-02-24 03:51:57,848 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 256 to 198. [2022-02-24 03:51:57,848 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 198 states, 188 states have (on average 1.202127659574468) internal successors, (226), 189 states have internal predecessors, (226), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:51:57,849 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 198 states to 198 states and 237 transitions. [2022-02-24 03:51:57,849 INFO L78 Accepts]: Start accepts. Automaton has 198 states and 237 transitions. Word has length 46 [2022-02-24 03:51:57,849 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:51:57,849 INFO L470 AbstractCegarLoop]: Abstraction has 198 states and 237 transitions. [2022-02-24 03:51:57,849 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 2.6666666666666665) internal successors, (40), 14 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:57,849 INFO L276 IsEmpty]: Start isEmpty. Operand 198 states and 237 transitions. [2022-02-24 03:51:57,849 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-02-24 03:51:57,849 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:51:57,849 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:51:57,849 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2022-02-24 03:51:57,850 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:51:57,850 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:51:57,850 INFO L85 PathProgramCache]: Analyzing trace with hash 1569322332, now seen corresponding path program 22 times [2022-02-24 03:51:57,850 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:51:57,850 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1088417636] [2022-02-24 03:51:57,850 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:51:57,850 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:51:57,945 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:51:58,042 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:51:58,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:58,107 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:51:58,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:58,113 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:51:58,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:58,115 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 03:51:58,380 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:51:58,380 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1088417636] [2022-02-24 03:51:58,380 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1088417636] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:51:58,380 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:51:58,380 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2022-02-24 03:51:58,380 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1091651886] [2022-02-24 03:51:58,381 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:51:58,381 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-02-24 03:51:58,381 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:51:58,381 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-02-24 03:51:58,381 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2022-02-24 03:51:58,381 INFO L87 Difference]: Start difference. First operand 198 states and 237 transitions. Second operand has 16 states, 16 states have (on average 2.5) internal successors, (40), 15 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:58,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:51:58,741 INFO L93 Difference]: Finished difference Result 451 states and 532 transitions. [2022-02-24 03:51:58,742 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-02-24 03:51:58,742 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.5) internal successors, (40), 15 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 46 [2022-02-24 03:51:58,742 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:51:58,742 INFO L225 Difference]: With dead ends: 451 [2022-02-24 03:51:58,743 INFO L226 Difference]: Without dead ends: 265 [2022-02-24 03:51:58,743 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 14 SyntacticMatches, 15 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 127 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=69, Invalid=311, Unknown=0, NotChecked=0, Total=380 [2022-02-24 03:51:58,743 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 43 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 562 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 572 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 562 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-02-24 03:51:58,743 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 41 Invalid, 572 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 562 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-02-24 03:51:58,744 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 265 states. [2022-02-24 03:51:58,825 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 265 to 198. [2022-02-24 03:51:58,826 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 198 states, 188 states have (on average 1.202127659574468) internal successors, (226), 189 states have internal predecessors, (226), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:51:58,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 198 states to 198 states and 237 transitions. [2022-02-24 03:51:58,827 INFO L78 Accepts]: Start accepts. Automaton has 198 states and 237 transitions. Word has length 46 [2022-02-24 03:51:58,827 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:51:58,827 INFO L470 AbstractCegarLoop]: Abstraction has 198 states and 237 transitions. [2022-02-24 03:51:58,827 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 2.5) internal successors, (40), 15 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:58,827 INFO L276 IsEmpty]: Start isEmpty. Operand 198 states and 237 transitions. [2022-02-24 03:51:58,827 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-02-24 03:51:58,827 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:51:58,827 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:51:58,827 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2022-02-24 03:51:58,827 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:51:58,828 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:51:58,828 INFO L85 PathProgramCache]: Analyzing trace with hash -1339441570, now seen corresponding path program 23 times [2022-02-24 03:51:58,828 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:51:58,828 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1313569170] [2022-02-24 03:51:58,828 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:51:58,828 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:51:58,925 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:51:59,017 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:51:59,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:59,076 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:51:59,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:59,079 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:51:59,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:51:59,081 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 03:51:59,383 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:51:59,384 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1313569170] [2022-02-24 03:51:59,384 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1313569170] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:51:59,384 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:51:59,384 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2022-02-24 03:51:59,384 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1620881559] [2022-02-24 03:51:59,384 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:51:59,384 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-02-24 03:51:59,384 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:51:59,384 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-02-24 03:51:59,384 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=277, Unknown=0, NotChecked=0, Total=342 [2022-02-24 03:51:59,385 INFO L87 Difference]: Start difference. First operand 198 states and 237 transitions. Second operand has 17 states, 17 states have (on average 2.3529411764705883) internal successors, (40), 16 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:59,835 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:51:59,835 INFO L93 Difference]: Finished difference Result 445 states and 526 transitions. [2022-02-24 03:51:59,835 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-02-24 03:51:59,835 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.3529411764705883) internal successors, (40), 16 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 46 [2022-02-24 03:51:59,836 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:51:59,836 INFO L225 Difference]: With dead ends: 445 [2022-02-24 03:51:59,836 INFO L226 Difference]: Without dead ends: 259 [2022-02-24 03:51:59,837 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 14 SyntacticMatches, 14 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 160 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2022-02-24 03:51:59,837 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 42 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 635 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 646 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 635 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-02-24 03:51:59,837 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [43 Valid, 46 Invalid, 646 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 635 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-02-24 03:51:59,838 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 259 states. [2022-02-24 03:51:59,921 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 259 to 198. [2022-02-24 03:51:59,921 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 198 states, 188 states have (on average 1.202127659574468) internal successors, (226), 189 states have internal predecessors, (226), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:51:59,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 198 states to 198 states and 237 transitions. [2022-02-24 03:51:59,921 INFO L78 Accepts]: Start accepts. Automaton has 198 states and 237 transitions. Word has length 46 [2022-02-24 03:51:59,922 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:51:59,922 INFO L470 AbstractCegarLoop]: Abstraction has 198 states and 237 transitions. [2022-02-24 03:51:59,922 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.3529411764705883) internal successors, (40), 16 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:51:59,922 INFO L276 IsEmpty]: Start isEmpty. Operand 198 states and 237 transitions. [2022-02-24 03:51:59,922 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-02-24 03:51:59,922 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:51:59,922 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:51:59,922 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2022-02-24 03:51:59,922 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:51:59,922 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:51:59,923 INFO L85 PathProgramCache]: Analyzing trace with hash -1277401956, now seen corresponding path program 24 times [2022-02-24 03:51:59,923 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:51:59,923 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [532100327] [2022-02-24 03:51:59,923 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:51:59,923 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:52:00,019 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:52:00,118 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:52:00,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:00,189 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:52:00,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:00,192 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:52:00,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:00,194 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 03:52:00,494 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:52:00,494 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [532100327] [2022-02-24 03:52:00,494 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [532100327] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:52:00,494 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:52:00,494 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2022-02-24 03:52:00,494 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [157584798] [2022-02-24 03:52:00,494 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:52:00,495 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-02-24 03:52:00,495 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:52:00,495 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-02-24 03:52:00,495 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=307, Unknown=0, NotChecked=0, Total=380 [2022-02-24 03:52:00,495 INFO L87 Difference]: Start difference. First operand 198 states and 237 transitions. Second operand has 18 states, 18 states have (on average 2.2222222222222223) internal successors, (40), 17 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:52:00,863 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:52:00,863 INFO L93 Difference]: Finished difference Result 439 states and 520 transitions. [2022-02-24 03:52:00,863 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-02-24 03:52:00,864 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.2222222222222223) internal successors, (40), 17 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 46 [2022-02-24 03:52:00,864 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:52:00,864 INFO L225 Difference]: With dead ends: 439 [2022-02-24 03:52:00,864 INFO L226 Difference]: Without dead ends: 253 [2022-02-24 03:52:00,865 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 14 SyntacticMatches, 13 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=89, Invalid=373, Unknown=0, NotChecked=0, Total=462 [2022-02-24 03:52:00,865 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 56 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 577 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 589 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 577 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-02-24 03:52:00,865 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [57 Valid, 41 Invalid, 589 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 577 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-02-24 03:52:00,865 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 253 states. [2022-02-24 03:52:00,949 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 253 to 198. [2022-02-24 03:52:00,950 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 198 states, 188 states have (on average 1.202127659574468) internal successors, (226), 189 states have internal predecessors, (226), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:52:00,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 198 states to 198 states and 237 transitions. [2022-02-24 03:52:00,950 INFO L78 Accepts]: Start accepts. Automaton has 198 states and 237 transitions. Word has length 46 [2022-02-24 03:52:00,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:52:00,950 INFO L470 AbstractCegarLoop]: Abstraction has 198 states and 237 transitions. [2022-02-24 03:52:00,950 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 2.2222222222222223) internal successors, (40), 17 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:52:00,950 INFO L276 IsEmpty]: Start isEmpty. Operand 198 states and 237 transitions. [2022-02-24 03:52:00,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-02-24 03:52:00,951 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:52:00,951 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:52:00,951 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2022-02-24 03:52:00,951 INFO L402 AbstractCegarLoop]: === Iteration 46 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:52:00,951 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:52:00,951 INFO L85 PathProgramCache]: Analyzing trace with hash 1212127006, now seen corresponding path program 25 times [2022-02-24 03:52:00,951 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:52:00,951 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [586162375] [2022-02-24 03:52:00,951 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:52:00,952 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:52:01,057 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:52:01,158 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:52:01,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:01,243 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:52:01,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:01,246 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:52:01,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:01,248 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 03:52:01,535 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:52:01,535 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [586162375] [2022-02-24 03:52:01,535 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [586162375] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:52:01,535 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:52:01,535 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2022-02-24 03:52:01,535 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [465125699] [2022-02-24 03:52:01,535 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:52:01,535 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-02-24 03:52:01,536 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:52:01,536 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-02-24 03:52:01,536 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=339, Unknown=0, NotChecked=0, Total=420 [2022-02-24 03:52:01,536 INFO L87 Difference]: Start difference. First operand 198 states and 237 transitions. Second operand has 19 states, 19 states have (on average 2.1052631578947367) internal successors, (40), 18 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:52:02,007 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:52:02,007 INFO L93 Difference]: Finished difference Result 433 states and 514 transitions. [2022-02-24 03:52:02,007 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-02-24 03:52:02,007 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.1052631578947367) internal successors, (40), 18 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 46 [2022-02-24 03:52:02,007 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:52:02,008 INFO L225 Difference]: With dead ends: 433 [2022-02-24 03:52:02,008 INFO L226 Difference]: Without dead ends: 247 [2022-02-24 03:52:02,008 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 14 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 199 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=99, Invalid=407, Unknown=0, NotChecked=0, Total=506 [2022-02-24 03:52:02,009 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 52 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 865 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 878 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 865 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-02-24 03:52:02,009 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [53 Valid, 51 Invalid, 878 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 865 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-02-24 03:52:02,009 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 247 states. [2022-02-24 03:52:02,098 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 247 to 198. [2022-02-24 03:52:02,099 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 198 states, 188 states have (on average 1.202127659574468) internal successors, (226), 189 states have internal predecessors, (226), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:52:02,099 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 198 states to 198 states and 237 transitions. [2022-02-24 03:52:02,099 INFO L78 Accepts]: Start accepts. Automaton has 198 states and 237 transitions. Word has length 46 [2022-02-24 03:52:02,099 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:52:02,099 INFO L470 AbstractCegarLoop]: Abstraction has 198 states and 237 transitions. [2022-02-24 03:52:02,099 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 2.1052631578947367) internal successors, (40), 18 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:52:02,100 INFO L276 IsEmpty]: Start isEmpty. Operand 198 states and 237 transitions. [2022-02-24 03:52:02,100 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-02-24 03:52:02,100 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:52:02,100 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:52:02,100 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2022-02-24 03:52:02,100 INFO L402 AbstractCegarLoop]: === Iteration 47 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:52:02,100 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:52:02,100 INFO L85 PathProgramCache]: Analyzing trace with hash 394478556, now seen corresponding path program 26 times [2022-02-24 03:52:02,100 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:52:02,100 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [828993941] [2022-02-24 03:52:02,100 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:52:02,101 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:52:02,208 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:52:02,302 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:52:02,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:02,359 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:52:02,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:02,362 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:52:02,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:02,364 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 03:52:02,641 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:52:02,642 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [828993941] [2022-02-24 03:52:02,642 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [828993941] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:52:02,642 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:52:02,642 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2022-02-24 03:52:02,642 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2028155428] [2022-02-24 03:52:02,642 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:52:02,642 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-02-24 03:52:02,642 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:52:02,642 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-02-24 03:52:02,643 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=373, Unknown=0, NotChecked=0, Total=462 [2022-02-24 03:52:02,643 INFO L87 Difference]: Start difference. First operand 198 states and 237 transitions. Second operand has 20 states, 20 states have (on average 2.0) internal successors, (40), 19 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:52:03,141 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:52:03,142 INFO L93 Difference]: Finished difference Result 427 states and 508 transitions. [2022-02-24 03:52:03,142 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-02-24 03:52:03,142 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.0) internal successors, (40), 19 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 46 [2022-02-24 03:52:03,142 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:52:03,143 INFO L225 Difference]: With dead ends: 427 [2022-02-24 03:52:03,143 INFO L226 Difference]: Without dead ends: 241 [2022-02-24 03:52:03,144 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 14 SyntacticMatches, 11 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 205 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=109, Invalid=443, Unknown=0, NotChecked=0, Total=552 [2022-02-24 03:52:03,144 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 56 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 1000 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 1014 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 1000 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-02-24 03:52:03,144 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [57 Valid, 49 Invalid, 1014 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 1000 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-02-24 03:52:03,144 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 241 states. [2022-02-24 03:52:03,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 241 to 198. [2022-02-24 03:52:03,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 198 states, 188 states have (on average 1.202127659574468) internal successors, (226), 189 states have internal predecessors, (226), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:52:03,231 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 198 states to 198 states and 237 transitions. [2022-02-24 03:52:03,231 INFO L78 Accepts]: Start accepts. Automaton has 198 states and 237 transitions. Word has length 46 [2022-02-24 03:52:03,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:52:03,231 INFO L470 AbstractCegarLoop]: Abstraction has 198 states and 237 transitions. [2022-02-24 03:52:03,231 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.0) internal successors, (40), 19 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:52:03,231 INFO L276 IsEmpty]: Start isEmpty. Operand 198 states and 237 transitions. [2022-02-24 03:52:03,231 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-02-24 03:52:03,231 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:52:03,231 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:52:03,231 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2022-02-24 03:52:03,231 INFO L402 AbstractCegarLoop]: === Iteration 48 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:52:03,232 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:52:03,232 INFO L85 PathProgramCache]: Analyzing trace with hash -1193869346, now seen corresponding path program 27 times [2022-02-24 03:52:03,232 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:52:03,232 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1692624345] [2022-02-24 03:52:03,232 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:52:03,232 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:52:03,339 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:52:03,439 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:52:03,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:03,503 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:52:03,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:03,514 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:52:03,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:03,517 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 03:52:03,822 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:52:03,823 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1692624345] [2022-02-24 03:52:03,823 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1692624345] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:52:03,823 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:52:03,823 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2022-02-24 03:52:03,823 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1681024208] [2022-02-24 03:52:03,823 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:52:03,823 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-02-24 03:52:03,823 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:52:03,823 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-02-24 03:52:03,823 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=409, Unknown=0, NotChecked=0, Total=506 [2022-02-24 03:52:03,824 INFO L87 Difference]: Start difference. First operand 198 states and 237 transitions. Second operand has 21 states, 21 states have (on average 1.9047619047619047) internal successors, (40), 20 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:52:04,206 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:52:04,207 INFO L93 Difference]: Finished difference Result 421 states and 502 transitions. [2022-02-24 03:52:04,207 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-02-24 03:52:04,207 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.9047619047619047) internal successors, (40), 20 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 46 [2022-02-24 03:52:04,207 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:52:04,208 INFO L225 Difference]: With dead ends: 421 [2022-02-24 03:52:04,208 INFO L226 Difference]: Without dead ends: 235 [2022-02-24 03:52:04,208 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 14 SyntacticMatches, 10 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 202 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=119, Invalid=481, Unknown=0, NotChecked=0, Total=600 [2022-02-24 03:52:04,208 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 68 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 621 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 636 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 621 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-02-24 03:52:04,208 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [69 Valid, 38 Invalid, 636 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 621 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-02-24 03:52:04,209 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 235 states. [2022-02-24 03:52:04,294 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 235 to 198. [2022-02-24 03:52:04,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 198 states, 188 states have (on average 1.202127659574468) internal successors, (226), 189 states have internal predecessors, (226), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:52:04,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 198 states to 198 states and 237 transitions. [2022-02-24 03:52:04,295 INFO L78 Accepts]: Start accepts. Automaton has 198 states and 237 transitions. Word has length 46 [2022-02-24 03:52:04,295 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:52:04,295 INFO L470 AbstractCegarLoop]: Abstraction has 198 states and 237 transitions. [2022-02-24 03:52:04,295 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 1.9047619047619047) internal successors, (40), 20 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:52:04,295 INFO L276 IsEmpty]: Start isEmpty. Operand 198 states and 237 transitions. [2022-02-24 03:52:04,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-02-24 03:52:04,295 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:52:04,296 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:52:04,296 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2022-02-24 03:52:04,296 INFO L402 AbstractCegarLoop]: === Iteration 49 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:52:04,296 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:52:04,296 INFO L85 PathProgramCache]: Analyzing trace with hash 2089980700, now seen corresponding path program 28 times [2022-02-24 03:52:04,296 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:52:04,296 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2089650229] [2022-02-24 03:52:04,296 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:52:04,296 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:52:04,327 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:52:04,420 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:52:04,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:04,490 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:52:04,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:04,494 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:52:04,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:04,495 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 03:52:04,804 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:52:04,804 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2089650229] [2022-02-24 03:52:04,804 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [2089650229] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:52:04,804 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:52:04,804 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2022-02-24 03:52:04,804 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [884010408] [2022-02-24 03:52:04,804 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:52:04,804 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-02-24 03:52:04,804 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:52:04,804 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-02-24 03:52:04,805 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=447, Unknown=0, NotChecked=0, Total=552 [2022-02-24 03:52:04,805 INFO L87 Difference]: Start difference. First operand 198 states and 237 transitions. Second operand has 22 states, 22 states have (on average 1.8181818181818181) internal successors, (40), 21 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:52:05,316 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:52:05,316 INFO L93 Difference]: Finished difference Result 421 states and 505 transitions. [2022-02-24 03:52:05,316 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-02-24 03:52:05,316 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.8181818181818181) internal successors, (40), 21 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 46 [2022-02-24 03:52:05,316 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:52:05,317 INFO L225 Difference]: With dead ends: 421 [2022-02-24 03:52:05,317 INFO L226 Difference]: Without dead ends: 235 [2022-02-24 03:52:05,318 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 14 SyntacticMatches, 9 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=129, Invalid=521, Unknown=0, NotChecked=0, Total=650 [2022-02-24 03:52:05,318 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 69 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 987 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 1003 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 987 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-02-24 03:52:05,318 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [70 Valid, 48 Invalid, 1003 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 987 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-02-24 03:52:05,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 235 states. [2022-02-24 03:52:05,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 235 to 201. [2022-02-24 03:52:05,419 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 201 states, 191 states have (on average 1.2146596858638743) internal successors, (232), 192 states have internal predecessors, (232), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:52:05,420 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201 states to 201 states and 243 transitions. [2022-02-24 03:52:05,420 INFO L78 Accepts]: Start accepts. Automaton has 201 states and 243 transitions. Word has length 46 [2022-02-24 03:52:05,420 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:52:05,420 INFO L470 AbstractCegarLoop]: Abstraction has 201 states and 243 transitions. [2022-02-24 03:52:05,420 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 1.8181818181818181) internal successors, (40), 21 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:52:05,420 INFO L276 IsEmpty]: Start isEmpty. Operand 201 states and 243 transitions. [2022-02-24 03:52:05,421 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-02-24 03:52:05,421 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:52:05,421 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:52:05,421 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48 [2022-02-24 03:52:05,421 INFO L402 AbstractCegarLoop]: === Iteration 50 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:52:05,421 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:52:05,421 INFO L85 PathProgramCache]: Analyzing trace with hash 1924440350, now seen corresponding path program 8 times [2022-02-24 03:52:05,421 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:52:05,421 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [642802348] [2022-02-24 03:52:05,421 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:52:05,422 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:52:05,462 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:52:05,494 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:52:05,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:05,527 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:52:05,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:05,530 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:52:05,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:05,531 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 03:52:05,787 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:52:05,788 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [642802348] [2022-02-24 03:52:05,788 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [642802348] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:52:05,788 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:52:05,788 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2022-02-24 03:52:05,788 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [650504647] [2022-02-24 03:52:05,788 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:52:05,788 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-02-24 03:52:05,788 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:52:05,788 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-02-24 03:52:05,788 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=394, Unknown=0, NotChecked=0, Total=462 [2022-02-24 03:52:05,789 INFO L87 Difference]: Start difference. First operand 201 states and 243 transitions. Second operand has 21 states, 21 states have (on average 1.9047619047619047) internal successors, (40), 20 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:52:06,330 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:52:06,330 INFO L93 Difference]: Finished difference Result 427 states and 517 transitions. [2022-02-24 03:52:06,331 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-02-24 03:52:06,331 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.9047619047619047) internal successors, (40), 20 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 46 [2022-02-24 03:52:06,331 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:52:06,332 INFO L225 Difference]: With dead ends: 427 [2022-02-24 03:52:06,332 INFO L226 Difference]: Without dead ends: 238 [2022-02-24 03:52:06,332 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 13 SyntacticMatches, 9 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 128 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=72, Invalid=434, Unknown=0, NotChecked=0, Total=506 [2022-02-24 03:52:06,333 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 58 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 1059 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 1064 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 1059 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-02-24 03:52:06,333 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [59 Valid, 44 Invalid, 1064 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 1059 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-02-24 03:52:06,333 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 238 states. [2022-02-24 03:52:06,421 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 238 to 207. [2022-02-24 03:52:06,422 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 207 states, 197 states have (on average 1.2081218274111676) internal successors, (238), 198 states have internal predecessors, (238), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:52:06,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 249 transitions. [2022-02-24 03:52:06,422 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 249 transitions. Word has length 46 [2022-02-24 03:52:06,423 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:52:06,423 INFO L470 AbstractCegarLoop]: Abstraction has 207 states and 249 transitions. [2022-02-24 03:52:06,423 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 1.9047619047619047) internal successors, (40), 20 states have internal predecessors, (40), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:52:06,423 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 249 transitions. [2022-02-24 03:52:06,423 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-02-24 03:52:06,423 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:52:06,423 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:52:06,423 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable49 [2022-02-24 03:52:06,423 INFO L402 AbstractCegarLoop]: === Iteration 51 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:52:06,423 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:52:06,423 INFO L85 PathProgramCache]: Analyzing trace with hash -1705211235, now seen corresponding path program 9 times [2022-02-24 03:52:06,424 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:52:06,424 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [650497212] [2022-02-24 03:52:06,424 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:52:06,424 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:52:06,496 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:52:06,569 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:52:06,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:06,616 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:52:06,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:06,620 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:52:06,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:06,622 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 03:52:06,898 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:52:06,898 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [650497212] [2022-02-24 03:52:06,898 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [650497212] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:52:06,898 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:52:06,899 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2022-02-24 03:52:06,899 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1902295089] [2022-02-24 03:52:06,899 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:52:06,899 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-02-24 03:52:06,899 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:52:06,899 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-02-24 03:52:06,899 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2022-02-24 03:52:06,899 INFO L87 Difference]: Start difference. First operand 207 states and 249 transitions. Second operand has 16 states, 16 states have (on average 2.6875) internal successors, (43), 15 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:52:07,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:52:07,341 INFO L93 Difference]: Finished difference Result 478 states and 565 transitions. [2022-02-24 03:52:07,342 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-02-24 03:52:07,342 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.6875) internal successors, (43), 15 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 49 [2022-02-24 03:52:07,343 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:52:07,343 INFO L225 Difference]: With dead ends: 478 [2022-02-24 03:52:07,343 INFO L226 Difference]: Without dead ends: 283 [2022-02-24 03:52:07,344 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 15 SyntacticMatches, 18 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=59, Invalid=247, Unknown=0, NotChecked=0, Total=306 [2022-02-24 03:52:07,345 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 39 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 681 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 691 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 681 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-02-24 03:52:07,345 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 40 Invalid, 691 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 681 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-02-24 03:52:07,345 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 283 states. [2022-02-24 03:52:07,459 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 283 to 216. [2022-02-24 03:52:07,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 216 states, 206 states have (on average 1.1990291262135921) internal successors, (247), 207 states have internal predecessors, (247), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:52:07,460 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 216 states to 216 states and 258 transitions. [2022-02-24 03:52:07,460 INFO L78 Accepts]: Start accepts. Automaton has 216 states and 258 transitions. Word has length 49 [2022-02-24 03:52:07,460 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:52:07,460 INFO L470 AbstractCegarLoop]: Abstraction has 216 states and 258 transitions. [2022-02-24 03:52:07,461 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 2.6875) internal successors, (43), 15 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:52:07,461 INFO L276 IsEmpty]: Start isEmpty. Operand 216 states and 258 transitions. [2022-02-24 03:52:07,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-02-24 03:52:07,461 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:52:07,461 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:52:07,461 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50 [2022-02-24 03:52:07,461 INFO L402 AbstractCegarLoop]: === Iteration 52 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:52:07,462 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:52:07,462 INFO L85 PathProgramCache]: Analyzing trace with hash 1745750559, now seen corresponding path program 29 times [2022-02-24 03:52:07,462 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:52:07,462 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [267575696] [2022-02-24 03:52:07,462 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:52:07,462 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:52:07,561 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:52:07,656 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:52:07,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:07,729 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:52:07,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:07,736 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:52:07,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:07,739 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 03:52:08,076 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:52:08,076 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [267575696] [2022-02-24 03:52:08,076 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [267575696] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:52:08,076 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:52:08,076 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2022-02-24 03:52:08,076 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [931688232] [2022-02-24 03:52:08,076 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:52:08,076 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-02-24 03:52:08,076 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:52:08,077 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-02-24 03:52:08,077 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=282, Unknown=0, NotChecked=0, Total=342 [2022-02-24 03:52:08,077 INFO L87 Difference]: Start difference. First operand 216 states and 258 transitions. Second operand has 17 states, 17 states have (on average 2.5294117647058822) internal successors, (43), 16 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:52:08,621 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:52:08,621 INFO L93 Difference]: Finished difference Result 496 states and 583 transitions. [2022-02-24 03:52:08,622 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-02-24 03:52:08,622 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.5294117647058822) internal successors, (43), 16 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 49 [2022-02-24 03:52:08,622 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:52:08,623 INFO L225 Difference]: With dead ends: 496 [2022-02-24 03:52:08,623 INFO L226 Difference]: Without dead ends: 292 [2022-02-24 03:52:08,624 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 14 SyntacticMatches, 17 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=72, Invalid=348, Unknown=0, NotChecked=0, Total=420 [2022-02-24 03:52:08,624 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 42 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 814 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 824 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 814 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-02-24 03:52:08,624 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [43 Valid, 43 Invalid, 824 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 814 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-02-24 03:52:08,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 292 states. [2022-02-24 03:52:08,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 292 to 216. [2022-02-24 03:52:08,752 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 216 states, 206 states have (on average 1.1990291262135921) internal successors, (247), 207 states have internal predecessors, (247), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:52:08,752 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 216 states to 216 states and 258 transitions. [2022-02-24 03:52:08,752 INFO L78 Accepts]: Start accepts. Automaton has 216 states and 258 transitions. Word has length 49 [2022-02-24 03:52:08,753 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:52:08,753 INFO L470 AbstractCegarLoop]: Abstraction has 216 states and 258 transitions. [2022-02-24 03:52:08,753 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.5294117647058822) internal successors, (43), 16 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:52:08,753 INFO L276 IsEmpty]: Start isEmpty. Operand 216 states and 258 transitions. [2022-02-24 03:52:08,753 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-02-24 03:52:08,753 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:52:08,753 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 7, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:52:08,753 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51 [2022-02-24 03:52:08,753 INFO L402 AbstractCegarLoop]: === Iteration 53 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:52:08,753 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:52:08,753 INFO L85 PathProgramCache]: Analyzing trace with hash 2020510173, now seen corresponding path program 30 times [2022-02-24 03:52:08,753 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:52:08,754 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [81211241] [2022-02-24 03:52:08,754 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:52:08,754 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:52:08,853 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:52:08,956 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:52:08,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:09,042 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:52:09,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:09,045 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:52:09,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:09,050 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 03:52:09,408 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:52:09,408 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [81211241] [2022-02-24 03:52:09,408 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [81211241] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:52:09,408 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:52:09,408 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2022-02-24 03:52:09,408 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [684003200] [2022-02-24 03:52:09,408 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:52:09,408 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-02-24 03:52:09,408 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:52:09,408 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-02-24 03:52:09,409 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=312, Unknown=0, NotChecked=0, Total=380 [2022-02-24 03:52:09,409 INFO L87 Difference]: Start difference. First operand 216 states and 258 transitions. Second operand has 18 states, 18 states have (on average 2.388888888888889) internal successors, (43), 17 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:52:09,887 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:52:09,887 INFO L93 Difference]: Finished difference Result 490 states and 577 transitions. [2022-02-24 03:52:09,887 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-02-24 03:52:09,887 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.388888888888889) internal successors, (43), 17 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 49 [2022-02-24 03:52:09,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:52:09,888 INFO L225 Difference]: With dead ends: 490 [2022-02-24 03:52:09,888 INFO L226 Difference]: Without dead ends: 286 [2022-02-24 03:52:09,888 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 14 SyntacticMatches, 16 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 181 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2022-02-24 03:52:09,889 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 44 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 678 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 689 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 678 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-02-24 03:52:09,889 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [45 Valid, 44 Invalid, 689 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 678 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-02-24 03:52:09,889 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 286 states. [2022-02-24 03:52:10,017 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 286 to 216. [2022-02-24 03:52:10,017 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 216 states, 206 states have (on average 1.1990291262135921) internal successors, (247), 207 states have internal predecessors, (247), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:52:10,018 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 216 states to 216 states and 258 transitions. [2022-02-24 03:52:10,018 INFO L78 Accepts]: Start accepts. Automaton has 216 states and 258 transitions. Word has length 49 [2022-02-24 03:52:10,018 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:52:10,018 INFO L470 AbstractCegarLoop]: Abstraction has 216 states and 258 transitions. [2022-02-24 03:52:10,018 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 2.388888888888889) internal successors, (43), 17 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:52:10,018 INFO L276 IsEmpty]: Start isEmpty. Operand 216 states and 258 transitions. [2022-02-24 03:52:10,019 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-02-24 03:52:10,019 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:52:10,019 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 6, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:52:10,019 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52 [2022-02-24 03:52:10,019 INFO L402 AbstractCegarLoop]: === Iteration 54 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:52:10,020 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:52:10,020 INFO L85 PathProgramCache]: Analyzing trace with hash -888253729, now seen corresponding path program 31 times [2022-02-24 03:52:10,020 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:52:10,020 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1323983644] [2022-02-24 03:52:10,020 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:52:10,021 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:52:10,138 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:52:10,236 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:52:10,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:10,305 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:52:10,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:10,312 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:52:10,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:10,314 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 03:52:10,627 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:52:10,627 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1323983644] [2022-02-24 03:52:10,628 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1323983644] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:52:10,628 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:52:10,628 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2022-02-24 03:52:10,628 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [170079493] [2022-02-24 03:52:10,628 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:52:10,628 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-02-24 03:52:10,628 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:52:10,629 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-02-24 03:52:10,629 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=344, Unknown=0, NotChecked=0, Total=420 [2022-02-24 03:52:10,629 INFO L87 Difference]: Start difference. First operand 216 states and 258 transitions. Second operand has 19 states, 19 states have (on average 2.263157894736842) internal successors, (43), 18 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:52:11,141 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:52:11,141 INFO L93 Difference]: Finished difference Result 484 states and 571 transitions. [2022-02-24 03:52:11,141 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-02-24 03:52:11,141 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.263157894736842) internal successors, (43), 18 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 49 [2022-02-24 03:52:11,141 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:52:11,142 INFO L225 Difference]: With dead ends: 484 [2022-02-24 03:52:11,142 INFO L226 Difference]: Without dead ends: 280 [2022-02-24 03:52:11,142 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 14 SyntacticMatches, 15 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 211 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=92, Invalid=414, Unknown=0, NotChecked=0, Total=506 [2022-02-24 03:52:11,143 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 47 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 762 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 47 SdHoareTripleChecker+Invalid, 774 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 762 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-02-24 03:52:11,143 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 47 Invalid, 774 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 762 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-02-24 03:52:11,143 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 280 states. [2022-02-24 03:52:11,271 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 280 to 216. [2022-02-24 03:52:11,271 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 216 states, 206 states have (on average 1.1990291262135921) internal successors, (247), 207 states have internal predecessors, (247), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:52:11,272 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 216 states to 216 states and 258 transitions. [2022-02-24 03:52:11,272 INFO L78 Accepts]: Start accepts. Automaton has 216 states and 258 transitions. Word has length 49 [2022-02-24 03:52:11,272 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:52:11,272 INFO L470 AbstractCegarLoop]: Abstraction has 216 states and 258 transitions. [2022-02-24 03:52:11,272 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 2.263157894736842) internal successors, (43), 18 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:52:11,272 INFO L276 IsEmpty]: Start isEmpty. Operand 216 states and 258 transitions. [2022-02-24 03:52:11,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-02-24 03:52:11,272 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:52:11,273 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:52:11,273 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53 [2022-02-24 03:52:11,273 INFO L402 AbstractCegarLoop]: === Iteration 55 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:52:11,273 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:52:11,273 INFO L85 PathProgramCache]: Analyzing trace with hash -826214115, now seen corresponding path program 32 times [2022-02-24 03:52:11,273 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:52:11,273 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1191549398] [2022-02-24 03:52:11,273 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:52:11,273 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:52:11,373 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:52:11,480 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:52:11,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:11,541 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:52:11,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:11,552 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:52:11,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:11,554 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 03:52:11,911 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:52:11,911 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1191549398] [2022-02-24 03:52:11,911 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1191549398] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:52:11,911 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:52:11,912 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2022-02-24 03:52:11,912 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [322496765] [2022-02-24 03:52:11,912 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:52:11,912 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-02-24 03:52:11,912 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:52:11,912 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-02-24 03:52:11,912 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=378, Unknown=0, NotChecked=0, Total=462 [2022-02-24 03:52:11,912 INFO L87 Difference]: Start difference. First operand 216 states and 258 transitions. Second operand has 20 states, 20 states have (on average 2.15) internal successors, (43), 19 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:52:12,486 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:52:12,486 INFO L93 Difference]: Finished difference Result 478 states and 565 transitions. [2022-02-24 03:52:12,487 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-02-24 03:52:12,487 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.15) internal successors, (43), 19 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 49 [2022-02-24 03:52:12,487 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:52:12,488 INFO L225 Difference]: With dead ends: 478 [2022-02-24 03:52:12,488 INFO L226 Difference]: Without dead ends: 274 [2022-02-24 03:52:12,488 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 14 SyntacticMatches, 14 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 232 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=102, Invalid=450, Unknown=0, NotChecked=0, Total=552 [2022-02-24 03:52:12,488 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 53 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 912 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 50 SdHoareTripleChecker+Invalid, 925 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 912 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-02-24 03:52:12,489 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [54 Valid, 50 Invalid, 925 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 912 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-02-24 03:52:12,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 274 states. [2022-02-24 03:52:12,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 274 to 216. [2022-02-24 03:52:12,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 216 states, 206 states have (on average 1.1990291262135921) internal successors, (247), 207 states have internal predecessors, (247), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:52:12,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 216 states to 216 states and 258 transitions. [2022-02-24 03:52:12,618 INFO L78 Accepts]: Start accepts. Automaton has 216 states and 258 transitions. Word has length 49 [2022-02-24 03:52:12,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:52:12,618 INFO L470 AbstractCegarLoop]: Abstraction has 216 states and 258 transitions. [2022-02-24 03:52:12,618 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.15) internal successors, (43), 19 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:52:12,618 INFO L276 IsEmpty]: Start isEmpty. Operand 216 states and 258 transitions. [2022-02-24 03:52:12,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-02-24 03:52:12,618 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:52:12,618 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:52:12,618 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54 [2022-02-24 03:52:12,619 INFO L402 AbstractCegarLoop]: === Iteration 56 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:52:12,619 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:52:12,619 INFO L85 PathProgramCache]: Analyzing trace with hash 1663314847, now seen corresponding path program 33 times [2022-02-24 03:52:12,619 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:52:12,619 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [4598003] [2022-02-24 03:52:12,619 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:52:12,619 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:52:12,717 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:52:12,816 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:52:12,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:12,880 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:52:12,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:12,884 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:52:12,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:12,885 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 03:52:13,217 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:52:13,217 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [4598003] [2022-02-24 03:52:13,217 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [4598003] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:52:13,217 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:52:13,217 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2022-02-24 03:52:13,217 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [910131486] [2022-02-24 03:52:13,217 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:52:13,218 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-02-24 03:52:13,218 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:52:13,218 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-02-24 03:52:13,218 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=414, Unknown=0, NotChecked=0, Total=506 [2022-02-24 03:52:13,218 INFO L87 Difference]: Start difference. First operand 216 states and 258 transitions. Second operand has 21 states, 21 states have (on average 2.0476190476190474) internal successors, (43), 20 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:52:13,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:52:13,788 INFO L93 Difference]: Finished difference Result 472 states and 559 transitions. [2022-02-24 03:52:13,788 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-02-24 03:52:13,788 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 2.0476190476190474) internal successors, (43), 20 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 49 [2022-02-24 03:52:13,788 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:52:13,789 INFO L225 Difference]: With dead ends: 472 [2022-02-24 03:52:13,789 INFO L226 Difference]: Without dead ends: 268 [2022-02-24 03:52:13,789 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 14 SyntacticMatches, 13 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 244 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=112, Invalid=488, Unknown=0, NotChecked=0, Total=600 [2022-02-24 03:52:13,790 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 56 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 927 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 941 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 927 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-02-24 03:52:13,790 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [57 Valid, 44 Invalid, 941 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 927 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-02-24 03:52:13,790 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 268 states. [2022-02-24 03:52:13,921 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 268 to 216. [2022-02-24 03:52:13,921 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 216 states, 206 states have (on average 1.1990291262135921) internal successors, (247), 207 states have internal predecessors, (247), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:52:13,922 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 216 states to 216 states and 258 transitions. [2022-02-24 03:52:13,922 INFO L78 Accepts]: Start accepts. Automaton has 216 states and 258 transitions. Word has length 49 [2022-02-24 03:52:13,922 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:52:13,922 INFO L470 AbstractCegarLoop]: Abstraction has 216 states and 258 transitions. [2022-02-24 03:52:13,922 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 2.0476190476190474) internal successors, (43), 20 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:52:13,922 INFO L276 IsEmpty]: Start isEmpty. Operand 216 states and 258 transitions. [2022-02-24 03:52:13,922 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-02-24 03:52:13,922 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:52:13,923 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 6, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:52:13,923 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable55 [2022-02-24 03:52:13,923 INFO L402 AbstractCegarLoop]: === Iteration 57 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:52:13,923 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:52:13,923 INFO L85 PathProgramCache]: Analyzing trace with hash 845666397, now seen corresponding path program 34 times [2022-02-24 03:52:13,923 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:52:13,923 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [350785874] [2022-02-24 03:52:13,923 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:52:13,923 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:52:14,022 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:52:14,119 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:52:14,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:14,193 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:52:14,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:14,196 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:52:14,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:14,198 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 03:52:14,588 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:52:14,588 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [350785874] [2022-02-24 03:52:14,588 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [350785874] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:52:14,588 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:52:14,588 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2022-02-24 03:52:14,588 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [182799244] [2022-02-24 03:52:14,588 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:52:14,588 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-02-24 03:52:14,588 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:52:14,589 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-02-24 03:52:14,589 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=452, Unknown=0, NotChecked=0, Total=552 [2022-02-24 03:52:14,589 INFO L87 Difference]: Start difference. First operand 216 states and 258 transitions. Second operand has 22 states, 22 states have (on average 1.9545454545454546) internal successors, (43), 21 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:52:15,213 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:52:15,213 INFO L93 Difference]: Finished difference Result 466 states and 553 transitions. [2022-02-24 03:52:15,213 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-02-24 03:52:15,213 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.9545454545454546) internal successors, (43), 21 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 49 [2022-02-24 03:52:15,214 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:52:15,214 INFO L225 Difference]: With dead ends: 466 [2022-02-24 03:52:15,214 INFO L226 Difference]: Without dead ends: 262 [2022-02-24 03:52:15,215 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 14 SyntacticMatches, 12 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 247 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=122, Invalid=528, Unknown=0, NotChecked=0, Total=650 [2022-02-24 03:52:15,215 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 60 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 1082 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 1097 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 1082 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-02-24 03:52:15,215 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [61 Valid, 55 Invalid, 1097 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 1082 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-02-24 03:52:15,215 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 262 states. [2022-02-24 03:52:15,341 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 262 to 216. [2022-02-24 03:52:15,341 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 216 states, 206 states have (on average 1.1990291262135921) internal successors, (247), 207 states have internal predecessors, (247), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:52:15,341 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 216 states to 216 states and 258 transitions. [2022-02-24 03:52:15,341 INFO L78 Accepts]: Start accepts. Automaton has 216 states and 258 transitions. Word has length 49 [2022-02-24 03:52:15,342 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:52:15,342 INFO L470 AbstractCegarLoop]: Abstraction has 216 states and 258 transitions. [2022-02-24 03:52:15,342 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 1.9545454545454546) internal successors, (43), 21 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:52:15,342 INFO L276 IsEmpty]: Start isEmpty. Operand 216 states and 258 transitions. [2022-02-24 03:52:15,342 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-02-24 03:52:15,342 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:52:15,343 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 7, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:52:15,343 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56 [2022-02-24 03:52:15,343 INFO L402 AbstractCegarLoop]: === Iteration 58 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:52:15,343 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:52:15,343 INFO L85 PathProgramCache]: Analyzing trace with hash -742681505, now seen corresponding path program 35 times [2022-02-24 03:52:15,343 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:52:15,343 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [322383388] [2022-02-24 03:52:15,343 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:52:15,343 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:52:15,443 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:52:15,545 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:52:15,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:15,627 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:52:15,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:15,634 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:52:15,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:15,636 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 03:52:15,996 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:52:15,996 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [322383388] [2022-02-24 03:52:15,997 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [322383388] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:52:15,997 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:52:15,997 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2022-02-24 03:52:15,997 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1913523885] [2022-02-24 03:52:15,997 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:52:15,997 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-02-24 03:52:15,997 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:52:15,997 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-02-24 03:52:15,997 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=492, Unknown=0, NotChecked=0, Total=600 [2022-02-24 03:52:15,997 INFO L87 Difference]: Start difference. First operand 216 states and 258 transitions. Second operand has 23 states, 23 states have (on average 1.8695652173913044) internal successors, (43), 22 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:52:16,474 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:52:16,474 INFO L93 Difference]: Finished difference Result 460 states and 547 transitions. [2022-02-24 03:52:16,475 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-02-24 03:52:16,475 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.8695652173913044) internal successors, (43), 22 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 49 [2022-02-24 03:52:16,475 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:52:16,476 INFO L225 Difference]: With dead ends: 460 [2022-02-24 03:52:16,476 INFO L226 Difference]: Without dead ends: 256 [2022-02-24 03:52:16,476 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 14 SyntacticMatches, 11 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 241 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=132, Invalid=570, Unknown=0, NotChecked=0, Total=702 [2022-02-24 03:52:16,477 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 70 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 685 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 71 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 701 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 685 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-02-24 03:52:16,477 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [71 Valid, 38 Invalid, 701 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 685 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-02-24 03:52:16,477 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 256 states. [2022-02-24 03:52:16,602 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 256 to 216. [2022-02-24 03:52:16,602 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 216 states, 206 states have (on average 1.1990291262135921) internal successors, (247), 207 states have internal predecessors, (247), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:52:16,602 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 216 states to 216 states and 258 transitions. [2022-02-24 03:52:16,603 INFO L78 Accepts]: Start accepts. Automaton has 216 states and 258 transitions. Word has length 49 [2022-02-24 03:52:16,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:52:16,603 INFO L470 AbstractCegarLoop]: Abstraction has 216 states and 258 transitions. [2022-02-24 03:52:16,603 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.8695652173913044) internal successors, (43), 22 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:52:16,603 INFO L276 IsEmpty]: Start isEmpty. Operand 216 states and 258 transitions. [2022-02-24 03:52:16,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-02-24 03:52:16,603 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:52:16,603 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:52:16,603 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable57 [2022-02-24 03:52:16,603 INFO L402 AbstractCegarLoop]: === Iteration 59 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:52:16,603 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:52:16,604 INFO L85 PathProgramCache]: Analyzing trace with hash -1753798755, now seen corresponding path program 36 times [2022-02-24 03:52:16,604 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:52:16,604 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1121394566] [2022-02-24 03:52:16,604 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:52:16,604 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:52:16,636 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:52:16,735 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:52:16,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:16,812 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:52:16,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:16,817 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:52:16,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:16,819 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 03:52:17,200 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:52:17,200 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1121394566] [2022-02-24 03:52:17,200 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1121394566] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:52:17,200 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:52:17,200 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2022-02-24 03:52:17,201 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1006791326] [2022-02-24 03:52:17,201 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:52:17,201 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-02-24 03:52:17,201 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:52:17,201 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-02-24 03:52:17,201 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=534, Unknown=0, NotChecked=0, Total=650 [2022-02-24 03:52:17,201 INFO L87 Difference]: Start difference. First operand 216 states and 258 transitions. Second operand has 24 states, 24 states have (on average 1.7916666666666667) internal successors, (43), 23 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:52:17,770 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:52:17,770 INFO L93 Difference]: Finished difference Result 460 states and 550 transitions. [2022-02-24 03:52:17,770 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-02-24 03:52:17,771 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.7916666666666667) internal successors, (43), 23 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 49 [2022-02-24 03:52:17,771 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:52:17,771 INFO L225 Difference]: With dead ends: 460 [2022-02-24 03:52:17,771 INFO L226 Difference]: Without dead ends: 256 [2022-02-24 03:52:17,772 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 14 SyntacticMatches, 10 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 226 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=142, Invalid=614, Unknown=0, NotChecked=0, Total=756 [2022-02-24 03:52:17,772 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 63 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 1010 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 64 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 1027 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 1010 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-02-24 03:52:17,772 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [64 Valid, 51 Invalid, 1027 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 1010 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-02-24 03:52:17,772 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 256 states. [2022-02-24 03:52:17,909 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 256 to 219. [2022-02-24 03:52:17,910 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 219 states, 209 states have (on average 1.2105263157894737) internal successors, (253), 210 states have internal predecessors, (253), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:52:17,910 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 219 states to 219 states and 264 transitions. [2022-02-24 03:52:17,910 INFO L78 Accepts]: Start accepts. Automaton has 219 states and 264 transitions. Word has length 49 [2022-02-24 03:52:17,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:52:17,910 INFO L470 AbstractCegarLoop]: Abstraction has 219 states and 264 transitions. [2022-02-24 03:52:17,911 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 1.7916666666666667) internal successors, (43), 23 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:52:17,911 INFO L276 IsEmpty]: Start isEmpty. Operand 219 states and 264 transitions. [2022-02-24 03:52:17,912 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2022-02-24 03:52:17,912 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:52:17,912 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:52:17,912 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable58 [2022-02-24 03:52:17,912 INFO L402 AbstractCegarLoop]: === Iteration 60 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:52:17,912 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:52:17,912 INFO L85 PathProgramCache]: Analyzing trace with hash -1919339105, now seen corresponding path program 9 times [2022-02-24 03:52:17,912 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:52:17,912 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [106609203] [2022-02-24 03:52:17,912 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:52:17,913 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:52:17,966 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:52:18,000 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:52:18,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:18,101 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:52:18,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:18,104 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:52:18,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:18,106 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 03:52:18,602 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:52:18,602 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [106609203] [2022-02-24 03:52:18,602 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [106609203] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:52:18,602 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:52:18,602 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [] total 28 [2022-02-24 03:52:18,602 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [400616781] [2022-02-24 03:52:18,602 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:52:18,602 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-02-24 03:52:18,602 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:52:18,602 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-02-24 03:52:18,603 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=688, Unknown=0, NotChecked=0, Total=812 [2022-02-24 03:52:18,603 INFO L87 Difference]: Start difference. First operand 219 states and 264 transitions. Second operand has 28 states, 28 states have (on average 1.5357142857142858) internal successors, (43), 26 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:52:19,277 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:52:19,277 INFO L93 Difference]: Finished difference Result 500 states and 605 transitions. [2022-02-24 03:52:19,278 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-02-24 03:52:19,278 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.5357142857142858) internal successors, (43), 26 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 49 [2022-02-24 03:52:19,278 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:52:19,279 INFO L225 Difference]: With dead ends: 500 [2022-02-24 03:52:19,279 INFO L226 Difference]: Without dead ends: 293 [2022-02-24 03:52:19,279 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 7 SyntacticMatches, 9 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 235 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=134, Invalid=796, Unknown=0, NotChecked=0, Total=930 [2022-02-24 03:52:19,280 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 66 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 1217 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 67 SdHoareTripleChecker+Invalid, 1226 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 1217 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-02-24 03:52:19,280 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [67 Valid, 67 Invalid, 1226 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 1217 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-02-24 03:52:19,280 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 293 states. [2022-02-24 03:52:19,419 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 293 to 248. [2022-02-24 03:52:19,420 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 248 states, 238 states have (on average 1.2226890756302522) internal successors, (291), 238 states have internal predecessors, (291), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:52:19,420 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 248 states to 248 states and 302 transitions. [2022-02-24 03:52:19,420 INFO L78 Accepts]: Start accepts. Automaton has 248 states and 302 transitions. Word has length 49 [2022-02-24 03:52:19,420 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:52:19,420 INFO L470 AbstractCegarLoop]: Abstraction has 248 states and 302 transitions. [2022-02-24 03:52:19,420 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 1.5357142857142858) internal successors, (43), 26 states have internal predecessors, (43), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:52:19,420 INFO L276 IsEmpty]: Start isEmpty. Operand 248 states and 302 transitions. [2022-02-24 03:52:19,421 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-02-24 03:52:19,421 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:52:19,421 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:52:19,421 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable59 [2022-02-24 03:52:19,422 INFO L402 AbstractCegarLoop]: === Iteration 61 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:52:19,422 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:52:19,422 INFO L85 PathProgramCache]: Analyzing trace with hash 1708450110, now seen corresponding path program 10 times [2022-02-24 03:52:19,422 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:52:19,422 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2142167909] [2022-02-24 03:52:19,422 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:52:19,422 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:52:19,497 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:52:19,567 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:52:19,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:19,609 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:52:19,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:19,612 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:52:19,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:19,624 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 03:52:19,962 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:52:19,962 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2142167909] [2022-02-24 03:52:19,962 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [2142167909] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:52:19,962 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:52:19,963 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2022-02-24 03:52:19,963 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [186631175] [2022-02-24 03:52:19,963 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:52:19,963 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-02-24 03:52:19,963 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:52:19,963 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-02-24 03:52:19,963 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=247, Unknown=0, NotChecked=0, Total=306 [2022-02-24 03:52:19,963 INFO L87 Difference]: Start difference. First operand 248 states and 302 transitions. Second operand has 17 states, 17 states have (on average 2.7058823529411766) internal successors, (46), 16 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:52:20,479 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:52:20,479 INFO L93 Difference]: Finished difference Result 539 states and 641 transitions. [2022-02-24 03:52:20,479 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-02-24 03:52:20,480 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.7058823529411766) internal successors, (46), 16 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 52 [2022-02-24 03:52:20,480 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:52:20,480 INFO L225 Difference]: With dead ends: 539 [2022-02-24 03:52:20,480 INFO L226 Difference]: Without dead ends: 332 [2022-02-24 03:52:20,481 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 15 SyntacticMatches, 20 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=63, Invalid=279, Unknown=0, NotChecked=0, Total=342 [2022-02-24 03:52:20,481 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 37 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 777 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 787 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 777 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-02-24 03:52:20,481 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 46 Invalid, 787 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 777 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-02-24 03:52:20,482 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 332 states. [2022-02-24 03:52:20,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 332 to 257. [2022-02-24 03:52:20,637 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 257 states, 247 states have (on average 1.214574898785425) internal successors, (300), 247 states have internal predecessors, (300), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:52:20,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 257 states to 257 states and 311 transitions. [2022-02-24 03:52:20,637 INFO L78 Accepts]: Start accepts. Automaton has 257 states and 311 transitions. Word has length 52 [2022-02-24 03:52:20,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:52:20,638 INFO L470 AbstractCegarLoop]: Abstraction has 257 states and 311 transitions. [2022-02-24 03:52:20,638 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.7058823529411766) internal successors, (46), 16 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:52:20,638 INFO L276 IsEmpty]: Start isEmpty. Operand 257 states and 311 transitions. [2022-02-24 03:52:20,638 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-02-24 03:52:20,638 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:52:20,638 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:52:20,638 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable60 [2022-02-24 03:52:20,638 INFO L402 AbstractCegarLoop]: === Iteration 62 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:52:20,638 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:52:20,638 INFO L85 PathProgramCache]: Analyzing trace with hash 679090812, now seen corresponding path program 37 times [2022-02-24 03:52:20,639 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:52:20,639 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1940292822] [2022-02-24 03:52:20,639 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:52:20,639 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:52:20,744 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:52:20,846 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:52:20,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:20,921 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:52:20,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:20,925 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:52:20,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:20,927 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 03:52:21,305 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:52:21,305 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1940292822] [2022-02-24 03:52:21,305 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1940292822] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:52:21,305 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:52:21,306 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2022-02-24 03:52:21,306 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [982453955] [2022-02-24 03:52:21,306 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:52:21,306 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-02-24 03:52:21,306 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:52:21,306 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-02-24 03:52:21,306 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=317, Unknown=0, NotChecked=0, Total=380 [2022-02-24 03:52:21,306 INFO L87 Difference]: Start difference. First operand 257 states and 311 transitions. Second operand has 18 states, 18 states have (on average 2.5555555555555554) internal successors, (46), 17 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:52:21,915 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:52:21,916 INFO L93 Difference]: Finished difference Result 557 states and 659 transitions. [2022-02-24 03:52:21,916 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-02-24 03:52:21,916 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.5555555555555554) internal successors, (46), 17 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 52 [2022-02-24 03:52:21,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:52:21,917 INFO L225 Difference]: With dead ends: 557 [2022-02-24 03:52:21,917 INFO L226 Difference]: Without dead ends: 341 [2022-02-24 03:52:21,917 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 14 SyntacticMatches, 19 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 157 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=75, Invalid=387, Unknown=0, NotChecked=0, Total=462 [2022-02-24 03:52:21,918 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 41 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 800 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 810 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 800 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-02-24 03:52:21,918 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [42 Valid, 49 Invalid, 810 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 800 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-02-24 03:52:21,918 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 341 states. [2022-02-24 03:52:22,097 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 341 to 257. [2022-02-24 03:52:22,098 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 257 states, 247 states have (on average 1.214574898785425) internal successors, (300), 247 states have internal predecessors, (300), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:52:22,098 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 257 states to 257 states and 311 transitions. [2022-02-24 03:52:22,099 INFO L78 Accepts]: Start accepts. Automaton has 257 states and 311 transitions. Word has length 52 [2022-02-24 03:52:22,099 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:52:22,099 INFO L470 AbstractCegarLoop]: Abstraction has 257 states and 311 transitions. [2022-02-24 03:52:22,099 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 2.5555555555555554) internal successors, (46), 17 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:52:22,099 INFO L276 IsEmpty]: Start isEmpty. Operand 257 states and 311 transitions. [2022-02-24 03:52:22,099 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-02-24 03:52:22,099 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:52:22,099 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:52:22,100 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable61 [2022-02-24 03:52:22,100 INFO L402 AbstractCegarLoop]: === Iteration 63 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:52:22,100 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:52:22,100 INFO L85 PathProgramCache]: Analyzing trace with hash -164914690, now seen corresponding path program 38 times [2022-02-24 03:52:22,100 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:52:22,100 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [149498403] [2022-02-24 03:52:22,100 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:52:22,101 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:52:22,213 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:52:22,318 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:52:22,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:22,382 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:52:22,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:22,385 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:52:22,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:22,387 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 03:52:22,752 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:52:22,752 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [149498403] [2022-02-24 03:52:22,753 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [149498403] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:52:22,753 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:52:22,753 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2022-02-24 03:52:22,753 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1975265860] [2022-02-24 03:52:22,753 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:52:22,753 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-02-24 03:52:22,753 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:52:22,753 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-02-24 03:52:22,753 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=349, Unknown=0, NotChecked=0, Total=420 [2022-02-24 03:52:22,753 INFO L87 Difference]: Start difference. First operand 257 states and 311 transitions. Second operand has 19 states, 19 states have (on average 2.4210526315789473) internal successors, (46), 18 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:52:23,438 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:52:23,438 INFO L93 Difference]: Finished difference Result 551 states and 653 transitions. [2022-02-24 03:52:23,439 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-02-24 03:52:23,439 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.4210526315789473) internal successors, (46), 18 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 52 [2022-02-24 03:52:23,439 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:52:23,440 INFO L225 Difference]: With dead ends: 551 [2022-02-24 03:52:23,440 INFO L226 Difference]: Without dead ends: 335 [2022-02-24 03:52:23,440 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 14 SyntacticMatches, 18 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 202 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=85, Invalid=421, Unknown=0, NotChecked=0, Total=506 [2022-02-24 03:52:23,440 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 48 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 953 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 964 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 953 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-02-24 03:52:23,441 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [49 Valid, 43 Invalid, 964 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 953 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-02-24 03:52:23,441 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 335 states. [2022-02-24 03:52:23,621 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 335 to 257. [2022-02-24 03:52:23,621 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 257 states, 247 states have (on average 1.214574898785425) internal successors, (300), 247 states have internal predecessors, (300), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:52:23,621 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 257 states to 257 states and 311 transitions. [2022-02-24 03:52:23,621 INFO L78 Accepts]: Start accepts. Automaton has 257 states and 311 transitions. Word has length 52 [2022-02-24 03:52:23,622 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:52:23,622 INFO L470 AbstractCegarLoop]: Abstraction has 257 states and 311 transitions. [2022-02-24 03:52:23,622 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 2.4210526315789473) internal successors, (46), 18 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:52:23,622 INFO L276 IsEmpty]: Start isEmpty. Operand 257 states and 311 transitions. [2022-02-24 03:52:23,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-02-24 03:52:23,625 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:52:23,625 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 7, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:52:23,625 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable62 [2022-02-24 03:52:23,625 INFO L402 AbstractCegarLoop]: === Iteration 64 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:52:23,625 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:52:23,625 INFO L85 PathProgramCache]: Analyzing trace with hash 109844924, now seen corresponding path program 39 times [2022-02-24 03:52:23,625 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:52:23,625 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1519543555] [2022-02-24 03:52:23,625 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:52:23,625 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:52:23,727 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:52:23,832 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:52:23,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:23,907 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:52:23,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:23,910 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:52:23,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:23,912 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 03:52:24,280 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:52:24,280 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1519543555] [2022-02-24 03:52:24,280 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1519543555] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:52:24,280 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:52:24,280 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2022-02-24 03:52:24,280 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1264765185] [2022-02-24 03:52:24,280 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:52:24,280 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-02-24 03:52:24,281 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:52:24,281 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-02-24 03:52:24,281 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=383, Unknown=0, NotChecked=0, Total=462 [2022-02-24 03:52:24,281 INFO L87 Difference]: Start difference. First operand 257 states and 311 transitions. Second operand has 20 states, 20 states have (on average 2.3) internal successors, (46), 19 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:52:24,970 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:52:24,970 INFO L93 Difference]: Finished difference Result 545 states and 647 transitions. [2022-02-24 03:52:24,971 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-02-24 03:52:24,971 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.3) internal successors, (46), 19 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 52 [2022-02-24 03:52:24,971 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:52:24,972 INFO L225 Difference]: With dead ends: 545 [2022-02-24 03:52:24,972 INFO L226 Difference]: Without dead ends: 329 [2022-02-24 03:52:24,972 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 14 SyntacticMatches, 17 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 238 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=95, Invalid=457, Unknown=0, NotChecked=0, Total=552 [2022-02-24 03:52:24,973 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 45 mSDsluCounter, 31 mSDsCounter, 0 mSdLazyCounter, 916 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 928 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 916 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-02-24 03:52:24,973 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [46 Valid, 52 Invalid, 928 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 916 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-02-24 03:52:24,973 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 329 states. [2022-02-24 03:52:25,185 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 329 to 257. [2022-02-24 03:52:25,186 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 257 states, 247 states have (on average 1.214574898785425) internal successors, (300), 247 states have internal predecessors, (300), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:52:25,186 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 257 states to 257 states and 311 transitions. [2022-02-24 03:52:25,186 INFO L78 Accepts]: Start accepts. Automaton has 257 states and 311 transitions. Word has length 52 [2022-02-24 03:52:25,186 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:52:25,186 INFO L470 AbstractCegarLoop]: Abstraction has 257 states and 311 transitions. [2022-02-24 03:52:25,186 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.3) internal successors, (46), 19 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:52:25,186 INFO L276 IsEmpty]: Start isEmpty. Operand 257 states and 311 transitions. [2022-02-24 03:52:25,187 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-02-24 03:52:25,187 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:52:25,187 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:52:25,187 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable63 [2022-02-24 03:52:25,187 INFO L402 AbstractCegarLoop]: === Iteration 65 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:52:25,187 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:52:25,187 INFO L85 PathProgramCache]: Analyzing trace with hash 1496048318, now seen corresponding path program 40 times [2022-02-24 03:52:25,187 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:52:25,187 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [656533420] [2022-02-24 03:52:25,187 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:52:25,188 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:52:25,291 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:52:25,426 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:52:25,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:25,492 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:52:25,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:25,495 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:52:25,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:25,497 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 03:52:25,870 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:52:25,871 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [656533420] [2022-02-24 03:52:25,871 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [656533420] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:52:25,871 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:52:25,871 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2022-02-24 03:52:25,871 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [585677716] [2022-02-24 03:52:25,871 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:52:25,871 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-02-24 03:52:25,871 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:52:25,871 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-02-24 03:52:25,871 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=419, Unknown=0, NotChecked=0, Total=506 [2022-02-24 03:52:25,872 INFO L87 Difference]: Start difference. First operand 257 states and 311 transitions. Second operand has 21 states, 21 states have (on average 2.1904761904761907) internal successors, (46), 20 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:52:26,633 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:52:26,633 INFO L93 Difference]: Finished difference Result 539 states and 641 transitions. [2022-02-24 03:52:26,634 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-02-24 03:52:26,634 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 2.1904761904761907) internal successors, (46), 20 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 52 [2022-02-24 03:52:26,634 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:52:26,635 INFO L225 Difference]: With dead ends: 539 [2022-02-24 03:52:26,635 INFO L226 Difference]: Without dead ends: 323 [2022-02-24 03:52:26,636 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 14 SyntacticMatches, 16 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 265 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=105, Invalid=495, Unknown=0, NotChecked=0, Total=600 [2022-02-24 03:52:26,636 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 53 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 1035 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 53 SdHoareTripleChecker+Invalid, 1048 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 1035 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-02-24 03:52:26,636 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [54 Valid, 53 Invalid, 1048 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 1035 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-02-24 03:52:26,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 323 states. [2022-02-24 03:52:26,839 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 323 to 257. [2022-02-24 03:52:26,840 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 257 states, 247 states have (on average 1.214574898785425) internal successors, (300), 247 states have internal predecessors, (300), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:52:26,840 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 257 states to 257 states and 311 transitions. [2022-02-24 03:52:26,840 INFO L78 Accepts]: Start accepts. Automaton has 257 states and 311 transitions. Word has length 52 [2022-02-24 03:52:26,840 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:52:26,840 INFO L470 AbstractCegarLoop]: Abstraction has 257 states and 311 transitions. [2022-02-24 03:52:26,840 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 2.1904761904761907) internal successors, (46), 20 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:52:26,840 INFO L276 IsEmpty]: Start isEmpty. Operand 257 states and 311 transitions. [2022-02-24 03:52:26,841 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-02-24 03:52:26,841 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:52:26,841 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:52:26,841 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable64 [2022-02-24 03:52:26,841 INFO L402 AbstractCegarLoop]: === Iteration 66 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:52:26,841 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:52:26,841 INFO L85 PathProgramCache]: Analyzing trace with hash 1558087932, now seen corresponding path program 41 times [2022-02-24 03:52:26,841 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:52:26,841 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1559863962] [2022-02-24 03:52:26,841 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:52:26,842 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:52:26,942 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:52:27,041 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:52:27,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:27,111 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:52:27,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:27,114 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:52:27,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:27,116 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 03:52:27,491 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:52:27,491 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1559863962] [2022-02-24 03:52:27,491 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1559863962] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:52:27,491 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:52:27,491 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2022-02-24 03:52:27,491 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1490380204] [2022-02-24 03:52:27,491 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:52:27,491 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-02-24 03:52:27,491 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:52:27,491 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-02-24 03:52:27,492 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=457, Unknown=0, NotChecked=0, Total=552 [2022-02-24 03:52:27,492 INFO L87 Difference]: Start difference. First operand 257 states and 311 transitions. Second operand has 22 states, 22 states have (on average 2.090909090909091) internal successors, (46), 21 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:52:28,207 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:52:28,207 INFO L93 Difference]: Finished difference Result 533 states and 635 transitions. [2022-02-24 03:52:28,208 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-02-24 03:52:28,208 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.090909090909091) internal successors, (46), 21 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 52 [2022-02-24 03:52:28,208 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:52:28,209 INFO L225 Difference]: With dead ends: 533 [2022-02-24 03:52:28,209 INFO L226 Difference]: Without dead ends: 317 [2022-02-24 03:52:28,209 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 14 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 283 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=115, Invalid=535, Unknown=0, NotChecked=0, Total=650 [2022-02-24 03:52:28,209 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 60 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 1006 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 50 SdHoareTripleChecker+Invalid, 1020 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 1006 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-02-24 03:52:28,209 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [61 Valid, 50 Invalid, 1020 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 1006 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-02-24 03:52:28,210 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 317 states. [2022-02-24 03:52:28,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 317 to 257. [2022-02-24 03:52:28,394 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 257 states, 247 states have (on average 1.214574898785425) internal successors, (300), 247 states have internal predecessors, (300), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:52:28,394 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 257 states to 257 states and 311 transitions. [2022-02-24 03:52:28,394 INFO L78 Accepts]: Start accepts. Automaton has 257 states and 311 transitions. Word has length 52 [2022-02-24 03:52:28,394 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:52:28,395 INFO L470 AbstractCegarLoop]: Abstraction has 257 states and 311 transitions. [2022-02-24 03:52:28,395 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 2.090909090909091) internal successors, (46), 21 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:52:28,395 INFO L276 IsEmpty]: Start isEmpty. Operand 257 states and 311 transitions. [2022-02-24 03:52:28,395 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-02-24 03:52:28,395 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:52:28,395 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:52:28,395 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable65 [2022-02-24 03:52:28,395 INFO L402 AbstractCegarLoop]: === Iteration 67 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:52:28,395 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:52:28,395 INFO L85 PathProgramCache]: Analyzing trace with hash -247350402, now seen corresponding path program 42 times [2022-02-24 03:52:28,395 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:52:28,395 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1889810274] [2022-02-24 03:52:28,396 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:52:28,396 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:52:28,502 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:52:28,605 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:52:28,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:28,671 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:52:28,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:28,674 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:52:28,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:28,676 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 03:52:29,066 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:52:29,066 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1889810274] [2022-02-24 03:52:29,066 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1889810274] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:52:29,066 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:52:29,067 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2022-02-24 03:52:29,067 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [517313487] [2022-02-24 03:52:29,067 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:52:29,067 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-02-24 03:52:29,067 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:52:29,067 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-02-24 03:52:29,067 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=497, Unknown=0, NotChecked=0, Total=600 [2022-02-24 03:52:29,067 INFO L87 Difference]: Start difference. First operand 257 states and 311 transitions. Second operand has 23 states, 23 states have (on average 2.0) internal successors, (46), 22 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:52:29,786 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:52:29,786 INFO L93 Difference]: Finished difference Result 527 states and 629 transitions. [2022-02-24 03:52:29,787 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-02-24 03:52:29,787 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.0) internal successors, (46), 22 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 52 [2022-02-24 03:52:29,787 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:52:29,788 INFO L225 Difference]: With dead ends: 527 [2022-02-24 03:52:29,788 INFO L226 Difference]: Without dead ends: 311 [2022-02-24 03:52:29,788 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 14 SyntacticMatches, 14 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 292 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=125, Invalid=577, Unknown=0, NotChecked=0, Total=702 [2022-02-24 03:52:29,789 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 64 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 1090 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 1105 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 1090 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-02-24 03:52:29,789 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [65 Valid, 43 Invalid, 1105 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 1090 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-02-24 03:52:29,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 311 states. [2022-02-24 03:52:29,978 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 311 to 257. [2022-02-24 03:52:29,979 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 257 states, 247 states have (on average 1.214574898785425) internal successors, (300), 247 states have internal predecessors, (300), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:52:29,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 257 states to 257 states and 311 transitions. [2022-02-24 03:52:29,979 INFO L78 Accepts]: Start accepts. Automaton has 257 states and 311 transitions. Word has length 52 [2022-02-24 03:52:29,979 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:52:29,979 INFO L470 AbstractCegarLoop]: Abstraction has 257 states and 311 transitions. [2022-02-24 03:52:29,979 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 2.0) internal successors, (46), 22 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:52:29,980 INFO L276 IsEmpty]: Start isEmpty. Operand 257 states and 311 transitions. [2022-02-24 03:52:29,980 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-02-24 03:52:29,980 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:52:29,980 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 7, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:52:29,980 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable66 [2022-02-24 03:52:29,980 INFO L402 AbstractCegarLoop]: === Iteration 68 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:52:29,980 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:52:29,980 INFO L85 PathProgramCache]: Analyzing trace with hash -1064998852, now seen corresponding path program 43 times [2022-02-24 03:52:29,980 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:52:29,980 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [178730412] [2022-02-24 03:52:29,980 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:52:29,981 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:52:30,084 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:52:30,186 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:52:30,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:30,264 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:52:30,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:30,280 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:52:30,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:30,282 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 03:52:30,707 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:52:30,707 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [178730412] [2022-02-24 03:52:30,707 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [178730412] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:52:30,707 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:52:30,707 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2022-02-24 03:52:30,707 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2015033660] [2022-02-24 03:52:30,707 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:52:30,708 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-02-24 03:52:30,708 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:52:30,708 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-02-24 03:52:30,708 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=539, Unknown=0, NotChecked=0, Total=650 [2022-02-24 03:52:30,708 INFO L87 Difference]: Start difference. First operand 257 states and 311 transitions. Second operand has 24 states, 24 states have (on average 1.9166666666666667) internal successors, (46), 23 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:52:31,436 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:52:31,436 INFO L93 Difference]: Finished difference Result 521 states and 623 transitions. [2022-02-24 03:52:31,437 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-02-24 03:52:31,437 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.9166666666666667) internal successors, (46), 23 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 52 [2022-02-24 03:52:31,437 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:52:31,438 INFO L225 Difference]: With dead ends: 521 [2022-02-24 03:52:31,438 INFO L226 Difference]: Without dead ends: 305 [2022-02-24 03:52:31,438 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 14 SyntacticMatches, 13 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 292 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=135, Invalid=621, Unknown=0, NotChecked=0, Total=756 [2022-02-24 03:52:31,438 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 68 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 1078 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 1094 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 1078 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-02-24 03:52:31,439 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [69 Valid, 43 Invalid, 1094 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 1078 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-02-24 03:52:31,439 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 305 states. [2022-02-24 03:52:31,630 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 305 to 257. [2022-02-24 03:52:31,631 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 257 states, 247 states have (on average 1.214574898785425) internal successors, (300), 247 states have internal predecessors, (300), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:52:31,631 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 257 states to 257 states and 311 transitions. [2022-02-24 03:52:31,631 INFO L78 Accepts]: Start accepts. Automaton has 257 states and 311 transitions. Word has length 52 [2022-02-24 03:52:31,631 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:52:31,631 INFO L470 AbstractCegarLoop]: Abstraction has 257 states and 311 transitions. [2022-02-24 03:52:31,631 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 1.9166666666666667) internal successors, (46), 23 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:52:31,631 INFO L276 IsEmpty]: Start isEmpty. Operand 257 states and 311 transitions. [2022-02-24 03:52:31,632 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-02-24 03:52:31,632 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:52:31,632 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:52:31,632 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable67 [2022-02-24 03:52:31,632 INFO L402 AbstractCegarLoop]: === Iteration 69 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:52:31,632 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:52:31,632 INFO L85 PathProgramCache]: Analyzing trace with hash 1641620542, now seen corresponding path program 44 times [2022-02-24 03:52:31,632 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:52:31,632 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [636111415] [2022-02-24 03:52:31,632 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:52:31,633 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:52:31,739 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:52:31,852 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:52:31,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:31,923 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:52:31,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:31,927 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:52:31,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:31,928 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 03:52:32,380 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:52:32,380 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [636111415] [2022-02-24 03:52:32,380 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [636111415] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:52:32,380 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:52:32,380 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2022-02-24 03:52:32,380 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1404448879] [2022-02-24 03:52:32,380 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:52:32,380 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-02-24 03:52:32,380 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:52:32,381 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-02-24 03:52:32,381 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=583, Unknown=0, NotChecked=0, Total=702 [2022-02-24 03:52:32,381 INFO L87 Difference]: Start difference. First operand 257 states and 311 transitions. Second operand has 25 states, 25 states have (on average 1.84) internal successors, (46), 24 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:52:33,161 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:52:33,161 INFO L93 Difference]: Finished difference Result 518 states and 620 transitions. [2022-02-24 03:52:33,162 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-02-24 03:52:33,162 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.84) internal successors, (46), 24 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 52 [2022-02-24 03:52:33,162 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:52:33,163 INFO L225 Difference]: With dead ends: 518 [2022-02-24 03:52:33,163 INFO L226 Difference]: Without dead ends: 302 [2022-02-24 03:52:33,164 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 14 SyntacticMatches, 12 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 283 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=145, Invalid=667, Unknown=0, NotChecked=0, Total=812 [2022-02-24 03:52:33,164 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 74 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 1126 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 75 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 1143 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 1126 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-02-24 03:52:33,164 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [75 Valid, 48 Invalid, 1143 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 1126 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-02-24 03:52:33,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 302 states. [2022-02-24 03:52:33,376 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 302 to 257. [2022-02-24 03:52:33,376 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 257 states, 247 states have (on average 1.214574898785425) internal successors, (300), 247 states have internal predecessors, (300), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:52:33,377 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 257 states to 257 states and 311 transitions. [2022-02-24 03:52:33,377 INFO L78 Accepts]: Start accepts. Automaton has 257 states and 311 transitions. Word has length 52 [2022-02-24 03:52:33,377 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:52:33,377 INFO L470 AbstractCegarLoop]: Abstraction has 257 states and 311 transitions. [2022-02-24 03:52:33,377 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.84) internal successors, (46), 24 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:52:33,377 INFO L276 IsEmpty]: Start isEmpty. Operand 257 states and 311 transitions. [2022-02-24 03:52:33,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-02-24 03:52:33,377 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:52:33,377 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:52:33,378 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable68 [2022-02-24 03:52:33,378 INFO L402 AbstractCegarLoop]: === Iteration 70 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:52:33,378 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:52:33,378 INFO L85 PathProgramCache]: Analyzing trace with hash 630503292, now seen corresponding path program 45 times [2022-02-24 03:52:33,378 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:52:33,378 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [358271374] [2022-02-24 03:52:33,378 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:52:33,378 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:52:33,412 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:52:33,514 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:52:33,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:33,585 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:52:33,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:33,604 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:52:33,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:33,606 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 03:52:34,039 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:52:34,039 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [358271374] [2022-02-24 03:52:34,039 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [358271374] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:52:34,039 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:52:34,040 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2022-02-24 03:52:34,040 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1556800461] [2022-02-24 03:52:34,040 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:52:34,040 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-02-24 03:52:34,040 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:52:34,040 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-02-24 03:52:34,040 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=127, Invalid=629, Unknown=0, NotChecked=0, Total=756 [2022-02-24 03:52:34,040 INFO L87 Difference]: Start difference. First operand 257 states and 311 transitions. Second operand has 26 states, 26 states have (on average 1.7692307692307692) internal successors, (46), 25 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:52:34,801 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:52:34,801 INFO L93 Difference]: Finished difference Result 521 states and 629 transitions. [2022-02-24 03:52:34,802 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-02-24 03:52:34,802 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.7692307692307692) internal successors, (46), 25 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 52 [2022-02-24 03:52:34,802 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:52:34,802 INFO L225 Difference]: With dead ends: 521 [2022-02-24 03:52:34,802 INFO L226 Difference]: Without dead ends: 305 [2022-02-24 03:52:34,803 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 14 SyntacticMatches, 11 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 265 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=155, Invalid=715, Unknown=0, NotChecked=0, Total=870 [2022-02-24 03:52:34,803 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 78 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 1217 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 79 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 1236 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 1217 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-02-24 03:52:34,803 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [79 Valid, 45 Invalid, 1236 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 1217 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-02-24 03:52:34,803 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 305 states. [2022-02-24 03:52:34,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 305 to 237. [2022-02-24 03:52:34,989 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 237 states, 227 states have (on average 1.2070484581497798) internal successors, (274), 228 states have internal predecessors, (274), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:52:34,989 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 237 states to 237 states and 285 transitions. [2022-02-24 03:52:34,989 INFO L78 Accepts]: Start accepts. Automaton has 237 states and 285 transitions. Word has length 52 [2022-02-24 03:52:34,989 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:52:34,989 INFO L470 AbstractCegarLoop]: Abstraction has 237 states and 285 transitions. [2022-02-24 03:52:34,989 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 1.7692307692307692) internal successors, (46), 25 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:52:34,989 INFO L276 IsEmpty]: Start isEmpty. Operand 237 states and 285 transitions. [2022-02-24 03:52:34,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-02-24 03:52:34,990 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:52:34,990 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:52:34,990 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable69 [2022-02-24 03:52:34,990 INFO L402 AbstractCegarLoop]: === Iteration 71 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:52:34,990 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:52:34,990 INFO L85 PathProgramCache]: Analyzing trace with hash 464962942, now seen corresponding path program 10 times [2022-02-24 03:52:34,990 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:52:34,990 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1317861472] [2022-02-24 03:52:34,990 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:52:34,990 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:52:35,037 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:52:35,068 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:52:35,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:35,106 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:52:35,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:35,109 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:52:35,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:35,110 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 03:52:35,491 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:52:35,491 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1317861472] [2022-02-24 03:52:35,491 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1317861472] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:52:35,491 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:52:35,491 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2022-02-24 03:52:35,491 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1052276317] [2022-02-24 03:52:35,491 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:52:35,491 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-02-24 03:52:35,491 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:52:35,491 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-02-24 03:52:35,491 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=568, Unknown=0, NotChecked=0, Total=650 [2022-02-24 03:52:35,492 INFO L87 Difference]: Start difference. First operand 237 states and 285 transitions. Second operand has 25 states, 25 states have (on average 1.84) internal successors, (46), 24 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:52:36,357 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:52:36,358 INFO L93 Difference]: Finished difference Result 505 states and 607 transitions. [2022-02-24 03:52:36,358 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-02-24 03:52:36,358 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.84) internal successors, (46), 24 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 52 [2022-02-24 03:52:36,358 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:52:36,359 INFO L225 Difference]: With dead ends: 505 [2022-02-24 03:52:36,359 INFO L226 Difference]: Without dead ends: 280 [2022-02-24 03:52:36,360 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 13 SyntacticMatches, 11 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 189 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=86, Invalid=616, Unknown=0, NotChecked=0, Total=702 [2022-02-24 03:52:36,360 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 58 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 1454 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 1459 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 1454 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-02-24 03:52:36,360 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [59 Valid, 55 Invalid, 1459 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 1454 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-02-24 03:52:36,360 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 280 states. [2022-02-24 03:52:36,559 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 280 to 243. [2022-02-24 03:52:36,559 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 243 states, 233 states have (on average 1.201716738197425) internal successors, (280), 234 states have internal predecessors, (280), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:52:36,559 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 243 states to 243 states and 291 transitions. [2022-02-24 03:52:36,560 INFO L78 Accepts]: Start accepts. Automaton has 243 states and 291 transitions. Word has length 52 [2022-02-24 03:52:36,560 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:52:36,560 INFO L470 AbstractCegarLoop]: Abstraction has 243 states and 291 transitions. [2022-02-24 03:52:36,560 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.84) internal successors, (46), 24 states have internal predecessors, (46), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:52:36,560 INFO L276 IsEmpty]: Start isEmpty. Operand 243 states and 291 transitions. [2022-02-24 03:52:36,560 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-02-24 03:52:36,560 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:52:36,560 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:52:36,560 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable70 [2022-02-24 03:52:36,560 INFO L402 AbstractCegarLoop]: === Iteration 72 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:52:36,561 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:52:36,561 INFO L85 PathProgramCache]: Analyzing trace with hash 1857944317, now seen corresponding path program 11 times [2022-02-24 03:52:36,561 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:52:36,561 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [927476163] [2022-02-24 03:52:36,561 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:52:36,561 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:52:36,645 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:52:36,720 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:52:36,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:36,760 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:52:36,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:36,763 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:52:36,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:36,764 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 03:52:37,151 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:52:37,152 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [927476163] [2022-02-24 03:52:37,152 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [927476163] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:52:37,152 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:52:37,152 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [18] imperfect sequences [] total 18 [2022-02-24 03:52:37,152 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1665664865] [2022-02-24 03:52:37,152 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:52:37,152 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-02-24 03:52:37,152 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:52:37,153 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-02-24 03:52:37,153 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=279, Unknown=0, NotChecked=0, Total=342 [2022-02-24 03:52:37,153 INFO L87 Difference]: Start difference. First operand 243 states and 291 transitions. Second operand has 18 states, 18 states have (on average 2.7222222222222223) internal successors, (49), 17 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:52:37,843 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:52:37,843 INFO L93 Difference]: Finished difference Result 568 states and 667 transitions. [2022-02-24 03:52:37,843 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-02-24 03:52:37,843 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.7222222222222223) internal successors, (49), 17 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 55 [2022-02-24 03:52:37,844 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:52:37,844 INFO L225 Difference]: With dead ends: 568 [2022-02-24 03:52:37,844 INFO L226 Difference]: Without dead ends: 337 [2022-02-24 03:52:37,845 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 15 SyntacticMatches, 22 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=67, Invalid=313, Unknown=0, NotChecked=0, Total=380 [2022-02-24 03:52:37,845 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 37 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 879 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 50 SdHoareTripleChecker+Invalid, 889 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 879 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-02-24 03:52:37,845 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 50 Invalid, 889 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 879 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-02-24 03:52:37,845 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 337 states. [2022-02-24 03:52:38,076 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 337 to 252. [2022-02-24 03:52:38,076 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 252 states, 242 states have (on average 1.1942148760330578) internal successors, (289), 243 states have internal predecessors, (289), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:52:38,077 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 252 states to 252 states and 300 transitions. [2022-02-24 03:52:38,077 INFO L78 Accepts]: Start accepts. Automaton has 252 states and 300 transitions. Word has length 55 [2022-02-24 03:52:38,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:52:38,077 INFO L470 AbstractCegarLoop]: Abstraction has 252 states and 300 transitions. [2022-02-24 03:52:38,077 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 2.7222222222222223) internal successors, (49), 17 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:52:38,077 INFO L276 IsEmpty]: Start isEmpty. Operand 252 states and 300 transitions. [2022-02-24 03:52:38,077 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-02-24 03:52:38,077 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:52:38,078 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:52:38,078 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable71 [2022-02-24 03:52:38,078 INFO L402 AbstractCegarLoop]: === Iteration 73 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:52:38,078 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:52:38,078 INFO L85 PathProgramCache]: Analyzing trace with hash -2013376257, now seen corresponding path program 46 times [2022-02-24 03:52:38,078 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:52:38,078 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1027824412] [2022-02-24 03:52:38,078 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:52:38,078 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:52:38,189 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:52:38,294 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:52:38,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:38,365 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:52:38,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:38,368 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:52:38,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:38,370 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 03:52:38,815 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:52:38,815 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1027824412] [2022-02-24 03:52:38,816 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1027824412] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:52:38,816 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:52:38,816 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2022-02-24 03:52:38,816 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [180053850] [2022-02-24 03:52:38,816 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:52:38,816 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-02-24 03:52:38,816 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:52:38,816 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-02-24 03:52:38,816 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=354, Unknown=0, NotChecked=0, Total=420 [2022-02-24 03:52:38,816 INFO L87 Difference]: Start difference. First operand 252 states and 300 transitions. Second operand has 19 states, 19 states have (on average 2.5789473684210527) internal successors, (49), 18 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:52:39,633 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:52:39,633 INFO L93 Difference]: Finished difference Result 586 states and 685 transitions. [2022-02-24 03:52:39,633 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-02-24 03:52:39,633 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.5789473684210527) internal successors, (49), 18 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 55 [2022-02-24 03:52:39,633 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:52:39,634 INFO L225 Difference]: With dead ends: 586 [2022-02-24 03:52:39,634 INFO L226 Difference]: Without dead ends: 346 [2022-02-24 03:52:39,635 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 14 SyntacticMatches, 21 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 172 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=78, Invalid=428, Unknown=0, NotChecked=0, Total=506 [2022-02-24 03:52:39,635 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 42 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 967 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 977 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 967 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-02-24 03:52:39,635 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [43 Valid, 42 Invalid, 977 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 967 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-02-24 03:52:39,636 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 346 states. [2022-02-24 03:52:39,867 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 346 to 252. [2022-02-24 03:52:39,868 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 252 states, 242 states have (on average 1.1942148760330578) internal successors, (289), 243 states have internal predecessors, (289), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:52:39,868 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 252 states to 252 states and 300 transitions. [2022-02-24 03:52:39,868 INFO L78 Accepts]: Start accepts. Automaton has 252 states and 300 transitions. Word has length 55 [2022-02-24 03:52:39,868 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:52:39,868 INFO L470 AbstractCegarLoop]: Abstraction has 252 states and 300 transitions. [2022-02-24 03:52:39,868 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 2.5789473684210527) internal successors, (49), 18 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:52:39,869 INFO L276 IsEmpty]: Start isEmpty. Operand 252 states and 300 transitions. [2022-02-24 03:52:39,869 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-02-24 03:52:39,869 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:52:39,869 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 9, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:52:39,869 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable72 [2022-02-24 03:52:39,869 INFO L402 AbstractCegarLoop]: === Iteration 74 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:52:39,869 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:52:39,869 INFO L85 PathProgramCache]: Analyzing trace with hash 1252231741, now seen corresponding path program 47 times [2022-02-24 03:52:39,869 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:52:39,869 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1411365433] [2022-02-24 03:52:39,869 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:52:39,870 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:52:39,986 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:52:40,092 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:52:40,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:40,157 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:52:40,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:40,160 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:52:40,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:40,162 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 03:52:40,599 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:52:40,599 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1411365433] [2022-02-24 03:52:40,599 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1411365433] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:52:40,599 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:52:40,600 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2022-02-24 03:52:40,600 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1864014853] [2022-02-24 03:52:40,600 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:52:40,600 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-02-24 03:52:40,600 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:52:40,600 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-02-24 03:52:40,600 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=388, Unknown=0, NotChecked=0, Total=462 [2022-02-24 03:52:40,600 INFO L87 Difference]: Start difference. First operand 252 states and 300 transitions. Second operand has 20 states, 20 states have (on average 2.45) internal successors, (49), 19 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:52:41,399 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:52:41,400 INFO L93 Difference]: Finished difference Result 580 states and 679 transitions. [2022-02-24 03:52:41,400 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-02-24 03:52:41,400 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.45) internal successors, (49), 19 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 55 [2022-02-24 03:52:41,400 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:52:41,401 INFO L225 Difference]: With dead ends: 580 [2022-02-24 03:52:41,401 INFO L226 Difference]: Without dead ends: 340 [2022-02-24 03:52:41,401 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 14 SyntacticMatches, 20 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 223 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=88, Invalid=464, Unknown=0, NotChecked=0, Total=552 [2022-02-24 03:52:41,402 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 50 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 881 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 892 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 881 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-02-24 03:52:41,402 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [51 Valid, 40 Invalid, 892 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 881 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-02-24 03:52:41,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 340 states. [2022-02-24 03:52:41,641 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 340 to 252. [2022-02-24 03:52:41,641 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 252 states, 242 states have (on average 1.1942148760330578) internal successors, (289), 243 states have internal predecessors, (289), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:52:41,642 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 252 states to 252 states and 300 transitions. [2022-02-24 03:52:41,642 INFO L78 Accepts]: Start accepts. Automaton has 252 states and 300 transitions. Word has length 55 [2022-02-24 03:52:41,642 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:52:41,642 INFO L470 AbstractCegarLoop]: Abstraction has 252 states and 300 transitions. [2022-02-24 03:52:41,642 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.45) internal successors, (49), 19 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:52:41,642 INFO L276 IsEmpty]: Start isEmpty. Operand 252 states and 300 transitions. [2022-02-24 03:52:41,642 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-02-24 03:52:41,643 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:52:41,643 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 8, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:52:41,643 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable73 [2022-02-24 03:52:41,643 INFO L402 AbstractCegarLoop]: === Iteration 75 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:52:41,643 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:52:41,643 INFO L85 PathProgramCache]: Analyzing trace with hash 408226239, now seen corresponding path program 48 times [2022-02-24 03:52:41,643 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:52:41,643 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2041694853] [2022-02-24 03:52:41,643 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:52:41,643 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:52:41,755 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:52:41,863 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:52:41,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:41,953 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:52:41,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:41,956 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:52:41,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:41,957 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 03:52:42,400 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:52:42,400 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2041694853] [2022-02-24 03:52:42,400 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [2041694853] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:52:42,400 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:52:42,400 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2022-02-24 03:52:42,400 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [486802563] [2022-02-24 03:52:42,400 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:52:42,400 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-02-24 03:52:42,400 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:52:42,401 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-02-24 03:52:42,401 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=424, Unknown=0, NotChecked=0, Total=506 [2022-02-24 03:52:42,401 INFO L87 Difference]: Start difference. First operand 252 states and 300 transitions. Second operand has 21 states, 21 states have (on average 2.3333333333333335) internal successors, (49), 20 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:52:43,182 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:52:43,182 INFO L93 Difference]: Finished difference Result 574 states and 673 transitions. [2022-02-24 03:52:43,182 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-02-24 03:52:43,182 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 2.3333333333333335) internal successors, (49), 20 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 55 [2022-02-24 03:52:43,182 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:52:43,183 INFO L225 Difference]: With dead ends: 574 [2022-02-24 03:52:43,183 INFO L226 Difference]: Without dead ends: 334 [2022-02-24 03:52:43,184 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 14 SyntacticMatches, 19 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 265 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=98, Invalid=502, Unknown=0, NotChecked=0, Total=600 [2022-02-24 03:52:43,184 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 54 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 924 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 936 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 924 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-02-24 03:52:43,184 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [55 Valid, 41 Invalid, 936 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 924 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-02-24 03:52:43,184 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 334 states. [2022-02-24 03:52:43,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 334 to 252. [2022-02-24 03:52:43,430 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 252 states, 242 states have (on average 1.1942148760330578) internal successors, (289), 243 states have internal predecessors, (289), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:52:43,430 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 252 states to 252 states and 300 transitions. [2022-02-24 03:52:43,430 INFO L78 Accepts]: Start accepts. Automaton has 252 states and 300 transitions. Word has length 55 [2022-02-24 03:52:43,430 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:52:43,430 INFO L470 AbstractCegarLoop]: Abstraction has 252 states and 300 transitions. [2022-02-24 03:52:43,430 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 2.3333333333333335) internal successors, (49), 20 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:52:43,431 INFO L276 IsEmpty]: Start isEmpty. Operand 252 states and 300 transitions. [2022-02-24 03:52:43,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-02-24 03:52:43,431 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:52:43,431 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 7, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:52:43,431 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable74 [2022-02-24 03:52:43,432 INFO L402 AbstractCegarLoop]: === Iteration 76 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:52:43,432 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:52:43,432 INFO L85 PathProgramCache]: Analyzing trace with hash 682985853, now seen corresponding path program 49 times [2022-02-24 03:52:43,432 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:52:43,432 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [16685968] [2022-02-24 03:52:43,432 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:52:43,432 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:52:43,560 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:52:43,665 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:52:43,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:43,736 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:52:43,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:43,739 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:52:43,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:43,740 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 03:52:44,164 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:52:44,165 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [16685968] [2022-02-24 03:52:44,165 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [16685968] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:52:44,165 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:52:44,165 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2022-02-24 03:52:44,165 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2072392484] [2022-02-24 03:52:44,165 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:52:44,165 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-02-24 03:52:44,165 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:52:44,165 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-02-24 03:52:44,165 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=462, Unknown=0, NotChecked=0, Total=552 [2022-02-24 03:52:44,166 INFO L87 Difference]: Start difference. First operand 252 states and 300 transitions. Second operand has 22 states, 22 states have (on average 2.227272727272727) internal successors, (49), 21 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:52:45,081 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:52:45,081 INFO L93 Difference]: Finished difference Result 568 states and 667 transitions. [2022-02-24 03:52:45,082 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-02-24 03:52:45,083 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.227272727272727) internal successors, (49), 21 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 55 [2022-02-24 03:52:45,083 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:52:45,083 INFO L225 Difference]: With dead ends: 568 [2022-02-24 03:52:45,083 INFO L226 Difference]: Without dead ends: 328 [2022-02-24 03:52:45,084 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 14 SyntacticMatches, 18 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 298 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=108, Invalid=542, Unknown=0, NotChecked=0, Total=650 [2022-02-24 03:52:45,084 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 53 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 1192 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 1205 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 1192 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-02-24 03:52:45,085 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [54 Valid, 46 Invalid, 1205 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 1192 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-02-24 03:52:45,085 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 328 states. [2022-02-24 03:52:45,336 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 328 to 252. [2022-02-24 03:52:45,336 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 252 states, 242 states have (on average 1.1942148760330578) internal successors, (289), 243 states have internal predecessors, (289), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:52:45,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 252 states to 252 states and 300 transitions. [2022-02-24 03:52:45,337 INFO L78 Accepts]: Start accepts. Automaton has 252 states and 300 transitions. Word has length 55 [2022-02-24 03:52:45,337 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:52:45,337 INFO L470 AbstractCegarLoop]: Abstraction has 252 states and 300 transitions. [2022-02-24 03:52:45,337 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 2.227272727272727) internal successors, (49), 21 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:52:45,337 INFO L276 IsEmpty]: Start isEmpty. Operand 252 states and 300 transitions. [2022-02-24 03:52:45,337 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-02-24 03:52:45,337 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:52:45,337 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:52:45,337 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable75 [2022-02-24 03:52:45,338 INFO L402 AbstractCegarLoop]: === Iteration 77 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:52:45,338 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:52:45,338 INFO L85 PathProgramCache]: Analyzing trace with hash 2069189247, now seen corresponding path program 50 times [2022-02-24 03:52:45,338 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:52:45,338 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2116000776] [2022-02-24 03:52:45,338 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:52:45,338 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:52:45,454 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:52:45,559 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:52:45,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:45,638 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:52:45,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:45,641 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:52:45,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:45,642 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 03:52:46,101 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:52:46,101 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2116000776] [2022-02-24 03:52:46,101 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [2116000776] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:52:46,101 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:52:46,101 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2022-02-24 03:52:46,101 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [93942533] [2022-02-24 03:52:46,101 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:52:46,101 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-02-24 03:52:46,101 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:52:46,102 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-02-24 03:52:46,102 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=502, Unknown=0, NotChecked=0, Total=600 [2022-02-24 03:52:46,102 INFO L87 Difference]: Start difference. First operand 252 states and 300 transitions. Second operand has 23 states, 23 states have (on average 2.130434782608696) internal successors, (49), 22 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:52:46,871 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:52:46,871 INFO L93 Difference]: Finished difference Result 562 states and 661 transitions. [2022-02-24 03:52:46,872 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-02-24 03:52:46,872 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.130434782608696) internal successors, (49), 22 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 55 [2022-02-24 03:52:46,872 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:52:46,873 INFO L225 Difference]: With dead ends: 562 [2022-02-24 03:52:46,873 INFO L226 Difference]: Without dead ends: 322 [2022-02-24 03:52:46,873 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 14 SyntacticMatches, 17 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 322 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=118, Invalid=584, Unknown=0, NotChecked=0, Total=702 [2022-02-24 03:52:46,873 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 67 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 806 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 68 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 820 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 806 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-02-24 03:52:46,873 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [68 Valid, 36 Invalid, 820 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 806 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-02-24 03:52:46,874 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 322 states. [2022-02-24 03:52:47,125 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 322 to 252. [2022-02-24 03:52:47,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 252 states, 242 states have (on average 1.1942148760330578) internal successors, (289), 243 states have internal predecessors, (289), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:52:47,126 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 252 states to 252 states and 300 transitions. [2022-02-24 03:52:47,126 INFO L78 Accepts]: Start accepts. Automaton has 252 states and 300 transitions. Word has length 55 [2022-02-24 03:52:47,126 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:52:47,126 INFO L470 AbstractCegarLoop]: Abstraction has 252 states and 300 transitions. [2022-02-24 03:52:47,126 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 2.130434782608696) internal successors, (49), 22 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:52:47,126 INFO L276 IsEmpty]: Start isEmpty. Operand 252 states and 300 transitions. [2022-02-24 03:52:47,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-02-24 03:52:47,127 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:52:47,127 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:52:47,127 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable76 [2022-02-24 03:52:47,127 INFO L402 AbstractCegarLoop]: === Iteration 78 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:52:47,127 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:52:47,127 INFO L85 PathProgramCache]: Analyzing trace with hash 2131228861, now seen corresponding path program 51 times [2022-02-24 03:52:47,127 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:52:47,127 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1349964929] [2022-02-24 03:52:47,127 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:52:47,128 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:52:47,237 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:52:47,343 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:52:47,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:47,412 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:52:47,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:47,419 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:52:47,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:47,420 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 03:52:47,885 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:52:47,885 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1349964929] [2022-02-24 03:52:47,885 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1349964929] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:52:47,885 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:52:47,885 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2022-02-24 03:52:47,885 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [842614722] [2022-02-24 03:52:47,885 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:52:47,885 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-02-24 03:52:47,885 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:52:47,886 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-02-24 03:52:47,886 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=544, Unknown=0, NotChecked=0, Total=650 [2022-02-24 03:52:47,886 INFO L87 Difference]: Start difference. First operand 252 states and 300 transitions. Second operand has 24 states, 24 states have (on average 2.0416666666666665) internal successors, (49), 23 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:52:48,820 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:52:48,820 INFO L93 Difference]: Finished difference Result 556 states and 655 transitions. [2022-02-24 03:52:48,820 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-02-24 03:52:48,820 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.0416666666666665) internal successors, (49), 23 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 55 [2022-02-24 03:52:48,820 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:52:48,821 INFO L225 Difference]: With dead ends: 556 [2022-02-24 03:52:48,821 INFO L226 Difference]: Without dead ends: 316 [2022-02-24 03:52:48,822 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 14 SyntacticMatches, 16 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 337 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=128, Invalid=628, Unknown=0, NotChecked=0, Total=756 [2022-02-24 03:52:48,822 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 63 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 1281 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 64 SdHoareTripleChecker+Valid, 47 SdHoareTripleChecker+Invalid, 1296 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 1281 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-02-24 03:52:48,822 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [64 Valid, 47 Invalid, 1296 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 1281 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-02-24 03:52:48,822 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 316 states. [2022-02-24 03:52:49,078 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 316 to 252. [2022-02-24 03:52:49,078 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 252 states, 242 states have (on average 1.1942148760330578) internal successors, (289), 243 states have internal predecessors, (289), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:52:49,079 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 252 states to 252 states and 300 transitions. [2022-02-24 03:52:49,079 INFO L78 Accepts]: Start accepts. Automaton has 252 states and 300 transitions. Word has length 55 [2022-02-24 03:52:49,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:52:49,079 INFO L470 AbstractCegarLoop]: Abstraction has 252 states and 300 transitions. [2022-02-24 03:52:49,079 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 2.0416666666666665) internal successors, (49), 23 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:52:49,079 INFO L276 IsEmpty]: Start isEmpty. Operand 252 states and 300 transitions. [2022-02-24 03:52:49,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-02-24 03:52:49,079 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:52:49,079 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 7, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:52:49,079 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable77 [2022-02-24 03:52:49,079 INFO L402 AbstractCegarLoop]: === Iteration 79 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:52:49,080 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:52:49,080 INFO L85 PathProgramCache]: Analyzing trace with hash 325790527, now seen corresponding path program 52 times [2022-02-24 03:52:49,080 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:52:49,080 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [641152857] [2022-02-24 03:52:49,080 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:52:49,080 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:52:49,188 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:52:49,295 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:52:49,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:49,377 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:52:49,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:49,380 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:52:49,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:49,382 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 03:52:49,867 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:52:49,868 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [641152857] [2022-02-24 03:52:49,868 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [641152857] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:52:49,868 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:52:49,868 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2022-02-24 03:52:49,868 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1601013067] [2022-02-24 03:52:49,868 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:52:49,868 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-02-24 03:52:49,868 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:52:49,868 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-02-24 03:52:49,868 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=588, Unknown=0, NotChecked=0, Total=702 [2022-02-24 03:52:49,869 INFO L87 Difference]: Start difference. First operand 252 states and 300 transitions. Second operand has 25 states, 25 states have (on average 1.96) internal successors, (49), 24 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:52:50,795 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:52:50,795 INFO L93 Difference]: Finished difference Result 550 states and 649 transitions. [2022-02-24 03:52:50,796 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-02-24 03:52:50,796 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.96) internal successors, (49), 24 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 55 [2022-02-24 03:52:50,796 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:52:50,797 INFO L225 Difference]: With dead ends: 550 [2022-02-24 03:52:50,797 INFO L226 Difference]: Without dead ends: 310 [2022-02-24 03:52:50,797 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 14 SyntacticMatches, 15 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 343 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=138, Invalid=674, Unknown=0, NotChecked=0, Total=812 [2022-02-24 03:52:50,797 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 67 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 1219 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 68 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 1235 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 1219 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-02-24 03:52:50,798 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [68 Valid, 48 Invalid, 1235 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 1219 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-02-24 03:52:50,798 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 310 states. [2022-02-24 03:52:51,054 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 310 to 252. [2022-02-24 03:52:51,054 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 252 states, 242 states have (on average 1.1942148760330578) internal successors, (289), 243 states have internal predecessors, (289), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:52:51,055 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 252 states to 252 states and 300 transitions. [2022-02-24 03:52:51,055 INFO L78 Accepts]: Start accepts. Automaton has 252 states and 300 transitions. Word has length 55 [2022-02-24 03:52:51,055 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:52:51,055 INFO L470 AbstractCegarLoop]: Abstraction has 252 states and 300 transitions. [2022-02-24 03:52:51,055 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.96) internal successors, (49), 24 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:52:51,055 INFO L276 IsEmpty]: Start isEmpty. Operand 252 states and 300 transitions. [2022-02-24 03:52:51,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-02-24 03:52:51,055 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:52:51,055 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 8, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:52:51,056 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable78 [2022-02-24 03:52:51,056 INFO L402 AbstractCegarLoop]: === Iteration 80 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:52:51,056 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:52:51,056 INFO L85 PathProgramCache]: Analyzing trace with hash -491857923, now seen corresponding path program 53 times [2022-02-24 03:52:51,056 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:52:51,056 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1076179616] [2022-02-24 03:52:51,056 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:52:51,056 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:52:51,180 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:52:51,302 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:52:51,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:51,381 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:52:51,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:51,384 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:52:51,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:51,386 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 03:52:51,898 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:52:51,898 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1076179616] [2022-02-24 03:52:51,898 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1076179616] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:52:51,898 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:52:51,899 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2022-02-24 03:52:51,899 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1626695427] [2022-02-24 03:52:51,899 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:52:51,899 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-02-24 03:52:51,899 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:52:51,899 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-02-24 03:52:51,899 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=634, Unknown=0, NotChecked=0, Total=756 [2022-02-24 03:52:51,899 INFO L87 Difference]: Start difference. First operand 252 states and 300 transitions. Second operand has 26 states, 26 states have (on average 1.8846153846153846) internal successors, (49), 25 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:52:52,763 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:52:52,763 INFO L93 Difference]: Finished difference Result 544 states and 643 transitions. [2022-02-24 03:52:52,763 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-02-24 03:52:52,764 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.8846153846153846) internal successors, (49), 25 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 55 [2022-02-24 03:52:52,764 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:52:52,764 INFO L225 Difference]: With dead ends: 544 [2022-02-24 03:52:52,764 INFO L226 Difference]: Without dead ends: 304 [2022-02-24 03:52:52,765 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 14 SyntacticMatches, 14 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 340 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=148, Invalid=722, Unknown=0, NotChecked=0, Total=870 [2022-02-24 03:52:52,765 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 83 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 1109 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 84 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 1126 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 1109 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-02-24 03:52:52,765 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [84 Valid, 42 Invalid, 1126 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 1109 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-02-24 03:52:52,765 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 304 states. [2022-02-24 03:52:53,038 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 304 to 252. [2022-02-24 03:52:53,038 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 252 states, 242 states have (on average 1.1942148760330578) internal successors, (289), 243 states have internal predecessors, (289), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:52:53,039 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 252 states to 252 states and 300 transitions. [2022-02-24 03:52:53,039 INFO L78 Accepts]: Start accepts. Automaton has 252 states and 300 transitions. Word has length 55 [2022-02-24 03:52:53,039 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:52:53,039 INFO L470 AbstractCegarLoop]: Abstraction has 252 states and 300 transitions. [2022-02-24 03:52:53,039 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 1.8846153846153846) internal successors, (49), 25 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:52:53,039 INFO L276 IsEmpty]: Start isEmpty. Operand 252 states and 300 transitions. [2022-02-24 03:52:53,039 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-02-24 03:52:53,039 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:52:53,039 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 9, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:52:53,039 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable79 [2022-02-24 03:52:53,039 INFO L402 AbstractCegarLoop]: === Iteration 81 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:52:53,040 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:52:53,040 INFO L85 PathProgramCache]: Analyzing trace with hash -2080205825, now seen corresponding path program 54 times [2022-02-24 03:52:53,040 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:52:53,040 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2060784912] [2022-02-24 03:52:53,040 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:52:53,040 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:52:53,150 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:52:53,254 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:52:53,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:53,323 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:52:53,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:53,333 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:52:53,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:53,335 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 03:52:53,852 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:52:53,852 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2060784912] [2022-02-24 03:52:53,852 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [2060784912] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:52:53,852 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:52:53,852 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2022-02-24 03:52:53,852 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1285728995] [2022-02-24 03:52:53,852 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:52:53,853 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-02-24 03:52:53,853 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:52:53,853 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-02-24 03:52:53,853 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=682, Unknown=0, NotChecked=0, Total=812 [2022-02-24 03:52:53,853 INFO L87 Difference]: Start difference. First operand 252 states and 300 transitions. Second operand has 27 states, 27 states have (on average 1.8148148148148149) internal successors, (49), 26 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:52:54,793 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:52:54,793 INFO L93 Difference]: Finished difference Result 538 states and 637 transitions. [2022-02-24 03:52:54,794 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-02-24 03:52:54,794 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.8148148148148149) internal successors, (49), 26 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 55 [2022-02-24 03:52:54,794 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:52:54,795 INFO L225 Difference]: With dead ends: 538 [2022-02-24 03:52:54,795 INFO L226 Difference]: Without dead ends: 298 [2022-02-24 03:52:54,796 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 14 SyntacticMatches, 13 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 328 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=158, Invalid=772, Unknown=0, NotChecked=0, Total=930 [2022-02-24 03:52:54,796 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 69 mSDsluCounter, 31 mSDsCounter, 0 mSdLazyCounter, 1230 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 1248 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 1230 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-02-24 03:52:54,796 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [70 Valid, 52 Invalid, 1248 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 1230 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-02-24 03:52:54,796 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 298 states. [2022-02-24 03:52:55,060 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 298 to 252. [2022-02-24 03:52:55,060 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 252 states, 242 states have (on average 1.1942148760330578) internal successors, (289), 243 states have internal predecessors, (289), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:52:55,061 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 252 states to 252 states and 300 transitions. [2022-02-24 03:52:55,061 INFO L78 Accepts]: Start accepts. Automaton has 252 states and 300 transitions. Word has length 55 [2022-02-24 03:52:55,061 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:52:55,061 INFO L470 AbstractCegarLoop]: Abstraction has 252 states and 300 transitions. [2022-02-24 03:52:55,061 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 1.8148148148148149) internal successors, (49), 26 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:52:55,061 INFO L276 IsEmpty]: Start isEmpty. Operand 252 states and 300 transitions. [2022-02-24 03:52:55,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-02-24 03:52:55,061 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:52:55,061 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:52:55,061 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable80 [2022-02-24 03:52:55,061 INFO L402 AbstractCegarLoop]: === Iteration 82 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:52:55,062 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:52:55,062 INFO L85 PathProgramCache]: Analyzing trace with hash 1203644221, now seen corresponding path program 55 times [2022-02-24 03:52:55,062 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:52:55,062 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [947002580] [2022-02-24 03:52:55,062 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:52:55,062 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:52:55,100 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:52:55,208 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:52:55,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:55,281 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:52:55,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:55,284 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:52:55,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:55,286 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 03:52:55,811 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:52:55,811 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [947002580] [2022-02-24 03:52:55,811 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [947002580] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:52:55,811 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:52:55,812 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [] total 28 [2022-02-24 03:52:55,812 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [39436812] [2022-02-24 03:52:55,812 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:52:55,812 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-02-24 03:52:55,812 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:52:55,812 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-02-24 03:52:55,812 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=732, Unknown=0, NotChecked=0, Total=870 [2022-02-24 03:52:55,812 INFO L87 Difference]: Start difference. First operand 252 states and 300 transitions. Second operand has 28 states, 28 states have (on average 1.75) internal successors, (49), 27 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:52:56,925 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:52:56,925 INFO L93 Difference]: Finished difference Result 538 states and 640 transitions. [2022-02-24 03:52:56,926 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-02-24 03:52:56,926 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.75) internal successors, (49), 27 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 55 [2022-02-24 03:52:56,926 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:52:56,927 INFO L225 Difference]: With dead ends: 538 [2022-02-24 03:52:56,927 INFO L226 Difference]: Without dead ends: 298 [2022-02-24 03:52:56,928 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 14 SyntacticMatches, 12 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 307 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=168, Invalid=824, Unknown=0, NotChecked=0, Total=992 [2022-02-24 03:52:56,928 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 72 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 1632 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 1651 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 1632 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-02-24 03:52:56,928 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [73 Valid, 57 Invalid, 1651 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 1632 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-02-24 03:52:56,928 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 298 states. [2022-02-24 03:52:57,199 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 298 to 255. [2022-02-24 03:52:57,200 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 255 states, 245 states have (on average 1.2040816326530612) internal successors, (295), 246 states have internal predecessors, (295), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:52:57,200 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 255 states to 255 states and 306 transitions. [2022-02-24 03:52:57,201 INFO L78 Accepts]: Start accepts. Automaton has 255 states and 306 transitions. Word has length 55 [2022-02-24 03:52:57,201 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:52:57,201 INFO L470 AbstractCegarLoop]: Abstraction has 255 states and 306 transitions. [2022-02-24 03:52:57,201 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 1.75) internal successors, (49), 27 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:52:57,201 INFO L276 IsEmpty]: Start isEmpty. Operand 255 states and 306 transitions. [2022-02-24 03:52:57,201 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2022-02-24 03:52:57,201 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:52:57,201 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:52:57,201 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable81 [2022-02-24 03:52:57,201 INFO L402 AbstractCegarLoop]: === Iteration 83 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:52:57,201 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:52:57,202 INFO L85 PathProgramCache]: Analyzing trace with hash 1038103871, now seen corresponding path program 11 times [2022-02-24 03:52:57,202 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:52:57,202 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1993714969] [2022-02-24 03:52:57,202 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:52:57,202 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:52:57,240 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:52:57,280 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:52:57,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:57,305 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:52:57,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:57,308 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:52:57,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:57,309 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 03:52:57,744 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:52:57,744 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1993714969] [2022-02-24 03:52:57,744 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1993714969] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:52:57,744 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:52:57,744 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2022-02-24 03:52:57,744 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [14405532] [2022-02-24 03:52:57,744 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:52:57,744 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-02-24 03:52:57,744 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:52:57,744 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-02-24 03:52:57,745 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=667, Unknown=0, NotChecked=0, Total=756 [2022-02-24 03:52:57,745 INFO L87 Difference]: Start difference. First operand 255 states and 306 transitions. Second operand has 27 states, 27 states have (on average 1.8148148148148149) internal successors, (49), 26 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:52:58,717 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:52:58,718 INFO L93 Difference]: Finished difference Result 544 states and 652 transitions. [2022-02-24 03:52:58,718 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-02-24 03:52:58,718 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.8148148148148149) internal successors, (49), 26 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 55 [2022-02-24 03:52:58,718 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:52:58,719 INFO L225 Difference]: With dead ends: 544 [2022-02-24 03:52:58,719 INFO L226 Difference]: Without dead ends: 301 [2022-02-24 03:52:58,719 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 13 SyntacticMatches, 12 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 224 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=93, Invalid=719, Unknown=0, NotChecked=0, Total=812 [2022-02-24 03:52:58,720 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 71 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 1471 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 1476 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 1471 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-02-24 03:52:58,720 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [72 Valid, 39 Invalid, 1476 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 1471 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-02-24 03:52:58,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 301 states. [2022-02-24 03:52:58,990 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 301 to 261. [2022-02-24 03:52:58,990 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 261 states, 251 states have (on average 1.199203187250996) internal successors, (301), 252 states have internal predecessors, (301), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:52:58,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 261 states to 261 states and 312 transitions. [2022-02-24 03:52:58,991 INFO L78 Accepts]: Start accepts. Automaton has 261 states and 312 transitions. Word has length 55 [2022-02-24 03:52:58,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:52:58,991 INFO L470 AbstractCegarLoop]: Abstraction has 261 states and 312 transitions. [2022-02-24 03:52:58,991 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 1.8148148148148149) internal successors, (49), 26 states have internal predecessors, (49), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:52:58,991 INFO L276 IsEmpty]: Start isEmpty. Operand 261 states and 312 transitions. [2022-02-24 03:52:58,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-02-24 03:52:58,991 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:52:58,991 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:52:58,991 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable82 [2022-02-24 03:52:58,991 INFO L402 AbstractCegarLoop]: === Iteration 84 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:52:58,991 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:52:58,992 INFO L85 PathProgramCache]: Analyzing trace with hash 1558779102, now seen corresponding path program 12 times [2022-02-24 03:52:58,992 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:52:58,992 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [461403962] [2022-02-24 03:52:58,992 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:52:58,992 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:52:59,068 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:52:59,141 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:52:59,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:59,193 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:52:59,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:59,196 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:52:59,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:52:59,198 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 03:52:59,604 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:52:59,605 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [461403962] [2022-02-24 03:52:59,605 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [461403962] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:52:59,605 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:52:59,605 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2022-02-24 03:52:59,605 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [553604812] [2022-02-24 03:52:59,605 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:52:59,605 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-02-24 03:52:59,605 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:52:59,605 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-02-24 03:52:59,605 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=313, Unknown=0, NotChecked=0, Total=380 [2022-02-24 03:52:59,606 INFO L87 Difference]: Start difference. First operand 261 states and 312 transitions. Second operand has 19 states, 19 states have (on average 2.736842105263158) internal successors, (52), 18 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:53:00,488 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:53:00,488 INFO L93 Difference]: Finished difference Result 613 states and 718 transitions. [2022-02-24 03:53:00,489 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-02-24 03:53:00,489 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.736842105263158) internal successors, (52), 18 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 58 [2022-02-24 03:53:00,489 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:53:00,490 INFO L225 Difference]: With dead ends: 613 [2022-02-24 03:53:00,490 INFO L226 Difference]: Without dead ends: 364 [2022-02-24 03:53:00,490 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 15 SyntacticMatches, 24 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=71, Invalid=349, Unknown=0, NotChecked=0, Total=420 [2022-02-24 03:53:00,490 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 37 mSDsluCounter, 31 mSDsCounter, 0 mSdLazyCounter, 987 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 997 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 987 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-02-24 03:53:00,490 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 52 Invalid, 997 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 987 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-02-24 03:53:00,491 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 364 states. [2022-02-24 03:53:00,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 364 to 270. [2022-02-24 03:53:00,792 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 270 states, 260 states have (on average 1.1923076923076923) internal successors, (310), 261 states have internal predecessors, (310), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:53:00,793 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 270 states to 270 states and 321 transitions. [2022-02-24 03:53:00,793 INFO L78 Accepts]: Start accepts. Automaton has 270 states and 321 transitions. Word has length 58 [2022-02-24 03:53:00,793 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:53:00,793 INFO L470 AbstractCegarLoop]: Abstraction has 270 states and 321 transitions. [2022-02-24 03:53:00,793 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 2.736842105263158) internal successors, (52), 18 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:53:00,793 INFO L276 IsEmpty]: Start isEmpty. Operand 270 states and 321 transitions. [2022-02-24 03:53:00,793 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-02-24 03:53:00,793 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:53:00,793 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:53:00,793 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable83 [2022-02-24 03:53:00,793 INFO L402 AbstractCegarLoop]: === Iteration 85 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:53:00,794 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:53:00,794 INFO L85 PathProgramCache]: Analyzing trace with hash -490608740, now seen corresponding path program 56 times [2022-02-24 03:53:00,794 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:53:00,794 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1172642735] [2022-02-24 03:53:00,794 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:53:00,794 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:53:00,929 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:53:01,052 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:53:01,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:53:01,123 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:53:01,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:53:01,126 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:53:01,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:53:01,128 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 03:53:01,655 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:53:01,655 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1172642735] [2022-02-24 03:53:01,655 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1172642735] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:53:01,655 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:53:01,655 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2022-02-24 03:53:01,655 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [793914899] [2022-02-24 03:53:01,655 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:53:01,655 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-02-24 03:53:01,655 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:53:01,656 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-02-24 03:53:01,656 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=393, Unknown=0, NotChecked=0, Total=462 [2022-02-24 03:53:01,656 INFO L87 Difference]: Start difference. First operand 270 states and 321 transitions. Second operand has 20 states, 20 states have (on average 2.6) internal successors, (52), 19 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:53:02,636 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:53:02,637 INFO L93 Difference]: Finished difference Result 631 states and 736 transitions. [2022-02-24 03:53:02,637 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-02-24 03:53:02,637 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.6) internal successors, (52), 19 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 58 [2022-02-24 03:53:02,637 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:53:02,638 INFO L225 Difference]: With dead ends: 631 [2022-02-24 03:53:02,638 INFO L226 Difference]: Without dead ends: 373 [2022-02-24 03:53:02,639 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 14 SyntacticMatches, 23 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 187 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=81, Invalid=471, Unknown=0, NotChecked=0, Total=552 [2022-02-24 03:53:02,639 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 41 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 1018 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 54 SdHoareTripleChecker+Invalid, 1028 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1018 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-02-24 03:53:02,639 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [42 Valid, 54 Invalid, 1028 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 1018 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-02-24 03:53:02,639 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 373 states. [2022-02-24 03:53:02,958 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 373 to 270. [2022-02-24 03:53:02,958 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 270 states, 260 states have (on average 1.1923076923076923) internal successors, (310), 261 states have internal predecessors, (310), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:53:02,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 270 states to 270 states and 321 transitions. [2022-02-24 03:53:02,959 INFO L78 Accepts]: Start accepts. Automaton has 270 states and 321 transitions. Word has length 58 [2022-02-24 03:53:02,959 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:53:02,959 INFO L470 AbstractCegarLoop]: Abstraction has 270 states and 321 transitions. [2022-02-24 03:53:02,959 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.6) internal successors, (52), 19 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:53:02,959 INFO L276 IsEmpty]: Start isEmpty. Operand 270 states and 321 transitions. [2022-02-24 03:53:02,959 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-02-24 03:53:02,959 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:53:02,959 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:53:02,959 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable84 [2022-02-24 03:53:02,959 INFO L402 AbstractCegarLoop]: === Iteration 86 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:53:02,960 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:53:02,960 INFO L85 PathProgramCache]: Analyzing trace with hash -66962018, now seen corresponding path program 57 times [2022-02-24 03:53:02,960 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:53:02,960 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [805424865] [2022-02-24 03:53:02,960 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:53:02,960 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:53:03,067 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:53:03,173 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:53:03,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:53:03,247 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:53:03,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:53:03,250 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:53:03,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:53:03,252 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 03:53:03,750 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:53:03,750 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [805424865] [2022-02-24 03:53:03,750 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [805424865] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:53:03,750 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:53:03,750 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2022-02-24 03:53:03,750 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [515868345] [2022-02-24 03:53:03,750 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:53:03,751 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-02-24 03:53:03,751 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:53:03,751 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-02-24 03:53:03,751 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=429, Unknown=0, NotChecked=0, Total=506 [2022-02-24 03:53:03,751 INFO L87 Difference]: Start difference. First operand 270 states and 321 transitions. Second operand has 21 states, 21 states have (on average 2.4761904761904763) internal successors, (52), 20 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:53:04,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:53:04,790 INFO L93 Difference]: Finished difference Result 625 states and 730 transitions. [2022-02-24 03:53:04,790 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-02-24 03:53:04,790 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 2.4761904761904763) internal successors, (52), 20 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 58 [2022-02-24 03:53:04,790 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:53:04,791 INFO L225 Difference]: With dead ends: 625 [2022-02-24 03:53:04,791 INFO L226 Difference]: Without dead ends: 367 [2022-02-24 03:53:04,791 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 14 SyntacticMatches, 22 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 244 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=91, Invalid=509, Unknown=0, NotChecked=0, Total=600 [2022-02-24 03:53:04,792 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 50 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 995 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 1006 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 995 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-02-24 03:53:04,792 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [51 Valid, 46 Invalid, 1006 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 995 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-02-24 03:53:04,792 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 367 states. [2022-02-24 03:53:05,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 367 to 270. [2022-02-24 03:53:05,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 270 states, 260 states have (on average 1.1923076923076923) internal successors, (310), 261 states have internal predecessors, (310), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:53:05,127 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 270 states to 270 states and 321 transitions. [2022-02-24 03:53:05,127 INFO L78 Accepts]: Start accepts. Automaton has 270 states and 321 transitions. Word has length 58 [2022-02-24 03:53:05,127 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:53:05,127 INFO L470 AbstractCegarLoop]: Abstraction has 270 states and 321 transitions. [2022-02-24 03:53:05,127 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 2.4761904761904763) internal successors, (52), 20 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:53:05,127 INFO L276 IsEmpty]: Start isEmpty. Operand 270 states and 321 transitions. [2022-02-24 03:53:05,128 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-02-24 03:53:05,128 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:53:05,128 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 9, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:53:05,128 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable85 [2022-02-24 03:53:05,128 INFO L402 AbstractCegarLoop]: === Iteration 87 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:53:05,128 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:53:05,128 INFO L85 PathProgramCache]: Analyzing trace with hash -1096321316, now seen corresponding path program 58 times [2022-02-24 03:53:05,128 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:53:05,128 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [760868243] [2022-02-24 03:53:05,128 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:53:05,129 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:53:05,256 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:53:05,362 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:53:05,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:53:05,436 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:53:05,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:53:05,439 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:53:05,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:53:05,440 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 03:53:05,942 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:53:05,942 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [760868243] [2022-02-24 03:53:05,943 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [760868243] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:53:05,943 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:53:05,943 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2022-02-24 03:53:05,943 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1520726893] [2022-02-24 03:53:05,943 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:53:05,943 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-02-24 03:53:05,943 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:53:05,943 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-02-24 03:53:05,943 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=467, Unknown=0, NotChecked=0, Total=552 [2022-02-24 03:53:05,943 INFO L87 Difference]: Start difference. First operand 270 states and 321 transitions. Second operand has 22 states, 22 states have (on average 2.3636363636363638) internal successors, (52), 21 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:53:07,036 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:53:07,036 INFO L93 Difference]: Finished difference Result 619 states and 724 transitions. [2022-02-24 03:53:07,037 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-02-24 03:53:07,037 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.3636363636363638) internal successors, (52), 21 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 58 [2022-02-24 03:53:07,037 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:53:07,038 INFO L225 Difference]: With dead ends: 619 [2022-02-24 03:53:07,038 INFO L226 Difference]: Without dead ends: 361 [2022-02-24 03:53:07,038 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 14 SyntacticMatches, 21 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 292 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=101, Invalid=549, Unknown=0, NotChecked=0, Total=650 [2022-02-24 03:53:07,039 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 51 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 1095 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 50 SdHoareTripleChecker+Invalid, 1107 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 1095 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-02-24 03:53:07,039 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [52 Valid, 50 Invalid, 1107 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 1095 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-02-24 03:53:07,039 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 361 states. [2022-02-24 03:53:07,385 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 361 to 270. [2022-02-24 03:53:07,386 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 270 states, 260 states have (on average 1.1923076923076923) internal successors, (310), 261 states have internal predecessors, (310), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:53:07,386 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 270 states to 270 states and 321 transitions. [2022-02-24 03:53:07,386 INFO L78 Accepts]: Start accepts. Automaton has 270 states and 321 transitions. Word has length 58 [2022-02-24 03:53:07,386 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:53:07,386 INFO L470 AbstractCegarLoop]: Abstraction has 270 states and 321 transitions. [2022-02-24 03:53:07,386 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 2.3636363636363638) internal successors, (52), 21 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:53:07,386 INFO L276 IsEmpty]: Start isEmpty. Operand 270 states and 321 transitions. [2022-02-24 03:53:07,386 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-02-24 03:53:07,386 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:53:07,387 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 8, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:53:07,387 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable86 [2022-02-24 03:53:07,387 INFO L402 AbstractCegarLoop]: === Iteration 88 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:53:07,387 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:53:07,387 INFO L85 PathProgramCache]: Analyzing trace with hash -1940326818, now seen corresponding path program 59 times [2022-02-24 03:53:07,387 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:53:07,387 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1174904109] [2022-02-24 03:53:07,387 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:53:07,387 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:53:07,497 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:53:07,615 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:53:07,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:53:07,701 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:53:07,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:53:07,704 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:53:07,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:53:07,705 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 03:53:08,255 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:53:08,256 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1174904109] [2022-02-24 03:53:08,256 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1174904109] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:53:08,256 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:53:08,256 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2022-02-24 03:53:08,256 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [171892721] [2022-02-24 03:53:08,256 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:53:08,256 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-02-24 03:53:08,256 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:53:08,256 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-02-24 03:53:08,256 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=507, Unknown=0, NotChecked=0, Total=600 [2022-02-24 03:53:08,257 INFO L87 Difference]: Start difference. First operand 270 states and 321 transitions. Second operand has 23 states, 23 states have (on average 2.260869565217391) internal successors, (52), 22 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:53:09,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:53:09,420 INFO L93 Difference]: Finished difference Result 613 states and 718 transitions. [2022-02-24 03:53:09,420 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-02-24 03:53:09,420 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.260869565217391) internal successors, (52), 22 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 58 [2022-02-24 03:53:09,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:53:09,421 INFO L225 Difference]: With dead ends: 613 [2022-02-24 03:53:09,421 INFO L226 Difference]: Without dead ends: 355 [2022-02-24 03:53:09,421 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 14 SyntacticMatches, 20 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 331 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=111, Invalid=591, Unknown=0, NotChecked=0, Total=702 [2022-02-24 03:53:09,421 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 55 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 1256 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 1269 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 1256 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-02-24 03:53:09,422 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [56 Valid, 46 Invalid, 1269 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 1256 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-02-24 03:53:09,422 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 355 states. [2022-02-24 03:53:09,785 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 355 to 270. [2022-02-24 03:53:09,785 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 270 states, 260 states have (on average 1.1923076923076923) internal successors, (310), 261 states have internal predecessors, (310), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:53:09,785 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 270 states to 270 states and 321 transitions. [2022-02-24 03:53:09,785 INFO L78 Accepts]: Start accepts. Automaton has 270 states and 321 transitions. Word has length 58 [2022-02-24 03:53:09,786 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:53:09,786 INFO L470 AbstractCegarLoop]: Abstraction has 270 states and 321 transitions. [2022-02-24 03:53:09,786 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 2.260869565217391) internal successors, (52), 22 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:53:09,786 INFO L276 IsEmpty]: Start isEmpty. Operand 270 states and 321 transitions. [2022-02-24 03:53:09,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-02-24 03:53:09,786 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:53:09,786 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 7, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:53:09,786 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable87 [2022-02-24 03:53:09,786 INFO L402 AbstractCegarLoop]: === Iteration 89 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:53:09,786 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:53:09,786 INFO L85 PathProgramCache]: Analyzing trace with hash -1665567204, now seen corresponding path program 60 times [2022-02-24 03:53:09,787 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:53:09,787 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1861072008] [2022-02-24 03:53:09,787 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:53:09,787 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:53:09,906 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:53:10,026 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:53:10,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:53:10,111 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:53:10,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:53:10,114 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:53:10,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:53:10,116 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 03:53:10,690 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:53:10,690 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1861072008] [2022-02-24 03:53:10,690 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1861072008] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:53:10,690 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:53:10,690 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2022-02-24 03:53:10,690 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1283087219] [2022-02-24 03:53:10,690 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:53:10,690 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-02-24 03:53:10,690 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:53:10,691 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-02-24 03:53:10,691 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=549, Unknown=0, NotChecked=0, Total=650 [2022-02-24 03:53:10,691 INFO L87 Difference]: Start difference. First operand 270 states and 321 transitions. Second operand has 24 states, 24 states have (on average 2.1666666666666665) internal successors, (52), 23 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:53:11,791 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:53:11,792 INFO L93 Difference]: Finished difference Result 607 states and 712 transitions. [2022-02-24 03:53:11,792 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-02-24 03:53:11,792 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.1666666666666665) internal successors, (52), 23 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 58 [2022-02-24 03:53:11,792 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:53:11,793 INFO L225 Difference]: With dead ends: 607 [2022-02-24 03:53:11,793 INFO L226 Difference]: Without dead ends: 349 [2022-02-24 03:53:11,793 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 14 SyntacticMatches, 19 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 361 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=121, Invalid=635, Unknown=0, NotChecked=0, Total=756 [2022-02-24 03:53:11,793 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 61 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 1166 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 62 SdHoareTripleChecker+Valid, 53 SdHoareTripleChecker+Invalid, 1180 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 1166 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-02-24 03:53:11,794 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [62 Valid, 53 Invalid, 1180 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 1166 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-02-24 03:53:11,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 349 states. [2022-02-24 03:53:12,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 349 to 270. [2022-02-24 03:53:12,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 270 states, 260 states have (on average 1.1923076923076923) internal successors, (310), 261 states have internal predecessors, (310), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:53:12,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 270 states to 270 states and 321 transitions. [2022-02-24 03:53:12,160 INFO L78 Accepts]: Start accepts. Automaton has 270 states and 321 transitions. Word has length 58 [2022-02-24 03:53:12,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:53:12,160 INFO L470 AbstractCegarLoop]: Abstraction has 270 states and 321 transitions. [2022-02-24 03:53:12,160 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 2.1666666666666665) internal successors, (52), 23 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:53:12,160 INFO L276 IsEmpty]: Start isEmpty. Operand 270 states and 321 transitions. [2022-02-24 03:53:12,161 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-02-24 03:53:12,161 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:53:12,161 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:53:12,161 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable88 [2022-02-24 03:53:12,161 INFO L402 AbstractCegarLoop]: === Iteration 90 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:53:12,161 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:53:12,161 INFO L85 PathProgramCache]: Analyzing trace with hash -279363810, now seen corresponding path program 61 times [2022-02-24 03:53:12,161 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:53:12,161 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2000969194] [2022-02-24 03:53:12,161 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:53:12,162 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:53:12,289 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:53:12,403 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:53:12,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:53:12,478 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:53:12,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:53:12,481 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:53:12,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:53:12,483 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 03:53:13,025 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:53:13,025 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2000969194] [2022-02-24 03:53:13,025 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [2000969194] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:53:13,025 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:53:13,025 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2022-02-24 03:53:13,025 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [424738193] [2022-02-24 03:53:13,025 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:53:13,025 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-02-24 03:53:13,026 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:53:13,026 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-02-24 03:53:13,026 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=593, Unknown=0, NotChecked=0, Total=702 [2022-02-24 03:53:13,026 INFO L87 Difference]: Start difference. First operand 270 states and 321 transitions. Second operand has 25 states, 25 states have (on average 2.08) internal successors, (52), 24 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:53:14,163 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:53:14,163 INFO L93 Difference]: Finished difference Result 601 states and 706 transitions. [2022-02-24 03:53:14,164 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-02-24 03:53:14,164 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.08) internal successors, (52), 24 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 58 [2022-02-24 03:53:14,164 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:53:14,165 INFO L225 Difference]: With dead ends: 601 [2022-02-24 03:53:14,165 INFO L226 Difference]: Without dead ends: 343 [2022-02-24 03:53:14,165 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 14 SyntacticMatches, 18 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 382 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=131, Invalid=681, Unknown=0, NotChecked=0, Total=812 [2022-02-24 03:53:14,166 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 63 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 1271 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 64 SdHoareTripleChecker+Valid, 53 SdHoareTripleChecker+Invalid, 1286 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 1271 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-02-24 03:53:14,166 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [64 Valid, 53 Invalid, 1286 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 1271 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-02-24 03:53:14,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 343 states. [2022-02-24 03:53:14,522 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 343 to 270. [2022-02-24 03:53:14,522 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 270 states, 260 states have (on average 1.1923076923076923) internal successors, (310), 261 states have internal predecessors, (310), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:53:14,523 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 270 states to 270 states and 321 transitions. [2022-02-24 03:53:14,523 INFO L78 Accepts]: Start accepts. Automaton has 270 states and 321 transitions. Word has length 58 [2022-02-24 03:53:14,523 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:53:14,523 INFO L470 AbstractCegarLoop]: Abstraction has 270 states and 321 transitions. [2022-02-24 03:53:14,523 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 2.08) internal successors, (52), 24 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:53:14,523 INFO L276 IsEmpty]: Start isEmpty. Operand 270 states and 321 transitions. [2022-02-24 03:53:14,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-02-24 03:53:14,523 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:53:14,523 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 7, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:53:14,524 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable89 [2022-02-24 03:53:14,524 INFO L402 AbstractCegarLoop]: === Iteration 91 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:53:14,524 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:53:14,524 INFO L85 PathProgramCache]: Analyzing trace with hash -217324196, now seen corresponding path program 62 times [2022-02-24 03:53:14,524 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:53:14,524 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [819927401] [2022-02-24 03:53:14,524 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:53:14,524 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:53:14,640 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:53:14,751 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:53:14,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:53:14,840 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:53:14,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:53:14,842 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:53:14,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:53:14,844 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 03:53:15,400 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:53:15,400 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [819927401] [2022-02-24 03:53:15,400 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [819927401] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:53:15,400 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:53:15,401 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2022-02-24 03:53:15,401 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1679668936] [2022-02-24 03:53:15,401 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:53:15,401 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-02-24 03:53:15,401 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:53:15,401 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-02-24 03:53:15,401 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=639, Unknown=0, NotChecked=0, Total=756 [2022-02-24 03:53:15,401 INFO L87 Difference]: Start difference. First operand 270 states and 321 transitions. Second operand has 26 states, 26 states have (on average 2.0) internal successors, (52), 25 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:53:16,662 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:53:16,662 INFO L93 Difference]: Finished difference Result 595 states and 700 transitions. [2022-02-24 03:53:16,663 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-02-24 03:53:16,663 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.0) internal successors, (52), 25 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 58 [2022-02-24 03:53:16,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:53:16,664 INFO L225 Difference]: With dead ends: 595 [2022-02-24 03:53:16,664 INFO L226 Difference]: Without dead ends: 337 [2022-02-24 03:53:16,667 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 14 SyntacticMatches, 17 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 394 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=141, Invalid=729, Unknown=0, NotChecked=0, Total=870 [2022-02-24 03:53:16,667 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 62 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 1474 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 60 SdHoareTripleChecker+Invalid, 1490 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 1474 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-02-24 03:53:16,667 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [63 Valid, 60 Invalid, 1490 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 1474 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-02-24 03:53:16,667 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 337 states. [2022-02-24 03:53:17,035 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 337 to 270. [2022-02-24 03:53:17,036 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 270 states, 260 states have (on average 1.1923076923076923) internal successors, (310), 261 states have internal predecessors, (310), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:53:17,036 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 270 states to 270 states and 321 transitions. [2022-02-24 03:53:17,036 INFO L78 Accepts]: Start accepts. Automaton has 270 states and 321 transitions. Word has length 58 [2022-02-24 03:53:17,036 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:53:17,036 INFO L470 AbstractCegarLoop]: Abstraction has 270 states and 321 transitions. [2022-02-24 03:53:17,036 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 2.0) internal successors, (52), 25 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:53:17,036 INFO L276 IsEmpty]: Start isEmpty. Operand 270 states and 321 transitions. [2022-02-24 03:53:17,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-02-24 03:53:17,036 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:53:17,037 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 8, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:53:17,037 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable90 [2022-02-24 03:53:17,037 INFO L402 AbstractCegarLoop]: === Iteration 92 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:53:17,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:53:17,037 INFO L85 PathProgramCache]: Analyzing trace with hash -2022762530, now seen corresponding path program 63 times [2022-02-24 03:53:17,037 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:53:17,037 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1317051956] [2022-02-24 03:53:17,037 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:53:17,037 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:53:17,148 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:53:17,258 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:53:17,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:53:17,340 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:53:17,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:53:17,343 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:53:17,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:53:17,344 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 03:53:17,887 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:53:17,887 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1317051956] [2022-02-24 03:53:17,888 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1317051956] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:53:17,888 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:53:17,888 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2022-02-24 03:53:17,888 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [174737182] [2022-02-24 03:53:17,888 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:53:17,888 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-02-24 03:53:17,888 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:53:17,888 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-02-24 03:53:17,888 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=687, Unknown=0, NotChecked=0, Total=812 [2022-02-24 03:53:17,888 INFO L87 Difference]: Start difference. First operand 270 states and 321 transitions. Second operand has 27 states, 27 states have (on average 1.9259259259259258) internal successors, (52), 26 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:53:18,904 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:53:18,904 INFO L93 Difference]: Finished difference Result 589 states and 694 transitions. [2022-02-24 03:53:18,905 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-02-24 03:53:18,905 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.9259259259259258) internal successors, (52), 26 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 58 [2022-02-24 03:53:18,905 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:53:18,906 INFO L225 Difference]: With dead ends: 589 [2022-02-24 03:53:18,906 INFO L226 Difference]: Without dead ends: 331 [2022-02-24 03:53:18,906 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 14 SyntacticMatches, 16 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 397 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=151, Invalid=779, Unknown=0, NotChecked=0, Total=930 [2022-02-24 03:53:18,906 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 72 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 1123 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 1140 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 1123 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-02-24 03:53:18,906 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [73 Valid, 45 Invalid, 1140 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 1123 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-02-24 03:53:18,907 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 331 states. [2022-02-24 03:53:19,265 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 331 to 270. [2022-02-24 03:53:19,265 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 270 states, 260 states have (on average 1.1923076923076923) internal successors, (310), 261 states have internal predecessors, (310), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:53:19,266 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 270 states to 270 states and 321 transitions. [2022-02-24 03:53:19,266 INFO L78 Accepts]: Start accepts. Automaton has 270 states and 321 transitions. Word has length 58 [2022-02-24 03:53:19,266 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:53:19,266 INFO L470 AbstractCegarLoop]: Abstraction has 270 states and 321 transitions. [2022-02-24 03:53:19,266 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 1.9259259259259258) internal successors, (52), 26 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:53:19,266 INFO L276 IsEmpty]: Start isEmpty. Operand 270 states and 321 transitions. [2022-02-24 03:53:19,266 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-02-24 03:53:19,266 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:53:19,266 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 9, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:53:19,266 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable91 [2022-02-24 03:53:19,266 INFO L402 AbstractCegarLoop]: === Iteration 93 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:53:19,267 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:53:19,267 INFO L85 PathProgramCache]: Analyzing trace with hash 1454556316, now seen corresponding path program 64 times [2022-02-24 03:53:19,267 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:53:19,267 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [72212042] [2022-02-24 03:53:19,267 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:53:19,267 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:53:19,380 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:53:19,494 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:53:19,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:53:19,573 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:53:19,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:53:19,577 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:53:19,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:53:19,578 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 03:53:20,168 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:53:20,168 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [72212042] [2022-02-24 03:53:20,168 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [72212042] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:53:20,168 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:53:20,168 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [] total 28 [2022-02-24 03:53:20,168 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1977306667] [2022-02-24 03:53:20,168 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:53:20,168 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-02-24 03:53:20,168 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:53:20,168 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-02-24 03:53:20,169 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=133, Invalid=737, Unknown=0, NotChecked=0, Total=870 [2022-02-24 03:53:20,169 INFO L87 Difference]: Start difference. First operand 270 states and 321 transitions. Second operand has 28 states, 28 states have (on average 1.8571428571428572) internal successors, (52), 27 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:53:21,346 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:53:21,346 INFO L93 Difference]: Finished difference Result 583 states and 688 transitions. [2022-02-24 03:53:21,346 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-02-24 03:53:21,346 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.8571428571428572) internal successors, (52), 27 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 58 [2022-02-24 03:53:21,346 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:53:21,347 INFO L225 Difference]: With dead ends: 583 [2022-02-24 03:53:21,347 INFO L226 Difference]: Without dead ends: 325 [2022-02-24 03:53:21,348 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 14 SyntacticMatches, 15 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 391 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=161, Invalid=831, Unknown=0, NotChecked=0, Total=992 [2022-02-24 03:53:21,348 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 83 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 1376 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 84 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 1394 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 1376 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-02-24 03:53:21,348 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [84 Valid, 46 Invalid, 1394 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 1376 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-02-24 03:53:21,348 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 325 states. [2022-02-24 03:53:21,740 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 325 to 270. [2022-02-24 03:53:21,740 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 270 states, 260 states have (on average 1.1923076923076923) internal successors, (310), 261 states have internal predecessors, (310), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:53:21,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 270 states to 270 states and 321 transitions. [2022-02-24 03:53:21,741 INFO L78 Accepts]: Start accepts. Automaton has 270 states and 321 transitions. Word has length 58 [2022-02-24 03:53:21,741 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:53:21,741 INFO L470 AbstractCegarLoop]: Abstraction has 270 states and 321 transitions. [2022-02-24 03:53:21,741 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 1.8571428571428572) internal successors, (52), 27 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:53:21,741 INFO L276 IsEmpty]: Start isEmpty. Operand 270 states and 321 transitions. [2022-02-24 03:53:21,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-02-24 03:53:21,741 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:53:21,741 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:53:21,741 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable92 [2022-02-24 03:53:21,741 INFO L402 AbstractCegarLoop]: === Iteration 94 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:53:21,742 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:53:21,742 INFO L85 PathProgramCache]: Analyzing trace with hash -133791586, now seen corresponding path program 65 times [2022-02-24 03:53:21,742 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:53:21,742 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1270146075] [2022-02-24 03:53:21,742 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:53:21,742 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:53:21,863 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:53:21,976 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:53:21,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:53:22,056 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:53:22,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:53:22,059 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:53:22,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:53:22,061 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 03:53:22,709 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:53:22,710 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1270146075] [2022-02-24 03:53:22,710 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1270146075] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:53:22,710 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:53:22,710 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2022-02-24 03:53:22,710 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [313099890] [2022-02-24 03:53:22,710 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:53:22,710 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-02-24 03:53:22,710 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:53:22,710 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-02-24 03:53:22,711 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=789, Unknown=0, NotChecked=0, Total=930 [2022-02-24 03:53:22,711 INFO L87 Difference]: Start difference. First operand 270 states and 321 transitions. Second operand has 29 states, 29 states have (on average 1.793103448275862) internal successors, (52), 28 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:53:23,847 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:53:23,848 INFO L93 Difference]: Finished difference Result 577 states and 682 transitions. [2022-02-24 03:53:23,848 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-02-24 03:53:23,848 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.793103448275862) internal successors, (52), 28 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 58 [2022-02-24 03:53:23,848 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:53:23,849 INFO L225 Difference]: With dead ends: 577 [2022-02-24 03:53:23,849 INFO L226 Difference]: Without dead ends: 319 [2022-02-24 03:53:23,849 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 14 SyntacticMatches, 14 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 376 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=171, Invalid=885, Unknown=0, NotChecked=0, Total=1056 [2022-02-24 03:53:23,849 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 87 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 1243 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 88 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 1262 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 1243 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-02-24 03:53:23,850 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [88 Valid, 43 Invalid, 1262 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 1243 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-02-24 03:53:23,850 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 319 states. [2022-02-24 03:53:24,234 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 319 to 270. [2022-02-24 03:53:24,234 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 270 states, 260 states have (on average 1.1923076923076923) internal successors, (310), 261 states have internal predecessors, (310), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:53:24,235 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 270 states to 270 states and 321 transitions. [2022-02-24 03:53:24,235 INFO L78 Accepts]: Start accepts. Automaton has 270 states and 321 transitions. Word has length 58 [2022-02-24 03:53:24,235 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:53:24,235 INFO L470 AbstractCegarLoop]: Abstraction has 270 states and 321 transitions. [2022-02-24 03:53:24,235 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.793103448275862) internal successors, (52), 28 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:53:24,235 INFO L276 IsEmpty]: Start isEmpty. Operand 270 states and 321 transitions. [2022-02-24 03:53:24,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-02-24 03:53:24,235 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:53:24,235 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:53:24,235 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable93 [2022-02-24 03:53:24,235 INFO L402 AbstractCegarLoop]: === Iteration 95 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:53:24,236 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:53:24,236 INFO L85 PathProgramCache]: Analyzing trace with hash -1144908836, now seen corresponding path program 66 times [2022-02-24 03:53:24,236 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:53:24,236 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [828685802] [2022-02-24 03:53:24,236 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:53:24,236 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:53:24,278 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:53:24,403 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:53:24,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:53:24,480 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:53:24,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:53:24,483 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:53:24,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:53:24,484 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 03:53:25,194 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:53:25,194 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [828685802] [2022-02-24 03:53:25,194 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [828685802] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:53:25,194 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:53:25,194 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2022-02-24 03:53:25,194 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1239818136] [2022-02-24 03:53:25,194 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:53:25,194 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-02-24 03:53:25,194 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:53:25,195 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-02-24 03:53:25,195 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=843, Unknown=0, NotChecked=0, Total=992 [2022-02-24 03:53:25,195 INFO L87 Difference]: Start difference. First operand 270 states and 321 transitions. Second operand has 30 states, 30 states have (on average 1.7333333333333334) internal successors, (52), 29 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:53:26,421 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:53:26,421 INFO L93 Difference]: Finished difference Result 577 states and 685 transitions. [2022-02-24 03:53:26,422 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-02-24 03:53:26,422 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 1.7333333333333334) internal successors, (52), 29 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 58 [2022-02-24 03:53:26,422 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:53:26,423 INFO L225 Difference]: With dead ends: 577 [2022-02-24 03:53:26,423 INFO L226 Difference]: Without dead ends: 319 [2022-02-24 03:53:26,423 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 14 SyntacticMatches, 13 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=181, Invalid=941, Unknown=0, NotChecked=0, Total=1122 [2022-02-24 03:53:26,424 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 81 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 1353 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 82 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 1373 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 1353 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-02-24 03:53:26,424 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [82 Valid, 49 Invalid, 1373 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 1353 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-02-24 03:53:26,424 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 319 states. [2022-02-24 03:53:26,794 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 319 to 273. [2022-02-24 03:53:26,794 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 273 states, 263 states have (on average 1.2015209125475286) internal successors, (316), 264 states have internal predecessors, (316), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:53:26,795 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 273 states to 273 states and 327 transitions. [2022-02-24 03:53:26,795 INFO L78 Accepts]: Start accepts. Automaton has 273 states and 327 transitions. Word has length 58 [2022-02-24 03:53:26,795 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:53:26,795 INFO L470 AbstractCegarLoop]: Abstraction has 273 states and 327 transitions. [2022-02-24 03:53:26,795 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 1.7333333333333334) internal successors, (52), 29 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:53:26,795 INFO L276 IsEmpty]: Start isEmpty. Operand 273 states and 327 transitions. [2022-02-24 03:53:26,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-02-24 03:53:26,795 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:53:26,795 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:53:26,796 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable94 [2022-02-24 03:53:26,796 INFO L402 AbstractCegarLoop]: === Iteration 96 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:53:26,796 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:53:26,796 INFO L85 PathProgramCache]: Analyzing trace with hash -1310449186, now seen corresponding path program 12 times [2022-02-24 03:53:26,796 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:53:26,796 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [453907637] [2022-02-24 03:53:26,796 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:53:26,796 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:53:26,834 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:53:26,870 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:53:26,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:53:26,898 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:53:26,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:53:26,904 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:53:26,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:53:26,907 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 03:53:27,437 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:53:27,438 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [453907637] [2022-02-24 03:53:27,438 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [453907637] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:53:27,438 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:53:27,438 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2022-02-24 03:53:27,438 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1193365130] [2022-02-24 03:53:27,438 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:53:27,438 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-02-24 03:53:27,438 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:53:27,438 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-02-24 03:53:27,438 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=774, Unknown=0, NotChecked=0, Total=870 [2022-02-24 03:53:27,439 INFO L87 Difference]: Start difference. First operand 273 states and 327 transitions. Second operand has 29 states, 29 states have (on average 1.793103448275862) internal successors, (52), 28 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:53:28,819 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:53:28,820 INFO L93 Difference]: Finished difference Result 583 states and 697 transitions. [2022-02-24 03:53:28,820 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-02-24 03:53:28,820 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.793103448275862) internal successors, (52), 28 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 58 [2022-02-24 03:53:28,820 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:53:28,821 INFO L225 Difference]: With dead ends: 583 [2022-02-24 03:53:28,821 INFO L226 Difference]: Without dead ends: 322 [2022-02-24 03:53:28,821 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 13 SyntacticMatches, 13 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 262 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=100, Invalid=830, Unknown=0, NotChecked=0, Total=930 [2022-02-24 03:53:28,822 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 69 mSDsluCounter, 35 mSDsCounter, 0 mSdLazyCounter, 1993 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 1998 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 1993 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-02-24 03:53:28,822 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [70 Valid, 56 Invalid, 1998 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 1993 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-02-24 03:53:28,822 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 322 states. [2022-02-24 03:53:29,216 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 322 to 279. [2022-02-24 03:53:29,217 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 279 states, 269 states have (on average 1.1970260223048328) internal successors, (322), 270 states have internal predecessors, (322), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:53:29,217 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 279 states to 279 states and 333 transitions. [2022-02-24 03:53:29,217 INFO L78 Accepts]: Start accepts. Automaton has 279 states and 333 transitions. Word has length 58 [2022-02-24 03:53:29,217 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:53:29,217 INFO L470 AbstractCegarLoop]: Abstraction has 279 states and 333 transitions. [2022-02-24 03:53:29,217 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.793103448275862) internal successors, (52), 28 states have internal predecessors, (52), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:53:29,217 INFO L276 IsEmpty]: Start isEmpty. Operand 279 states and 333 transitions. [2022-02-24 03:53:29,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-02-24 03:53:29,218 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:53:29,218 INFO L514 BasicCegarLoop]: trace histogram [13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:53:29,218 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable95 [2022-02-24 03:53:29,218 INFO L402 AbstractCegarLoop]: === Iteration 97 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:53:29,218 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:53:29,218 INFO L85 PathProgramCache]: Analyzing trace with hash 1184998237, now seen corresponding path program 13 times [2022-02-24 03:53:29,218 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:53:29,218 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1894546637] [2022-02-24 03:53:29,218 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:53:29,219 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:53:29,297 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:53:29,375 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:53:29,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:53:29,419 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:53:29,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:53:29,428 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:53:29,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:53:29,430 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 03:53:29,949 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:53:29,949 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1894546637] [2022-02-24 03:53:29,949 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1894546637] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:53:29,949 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:53:29,949 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [20] imperfect sequences [] total 20 [2022-02-24 03:53:29,949 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [388619419] [2022-02-24 03:53:29,950 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:53:29,950 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-02-24 03:53:29,950 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:53:29,950 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-02-24 03:53:29,950 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=349, Unknown=0, NotChecked=0, Total=420 [2022-02-24 03:53:29,950 INFO L87 Difference]: Start difference. First operand 279 states and 333 transitions. Second operand has 20 states, 20 states have (on average 2.75) internal successors, (55), 19 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:53:31,165 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:53:31,166 INFO L93 Difference]: Finished difference Result 658 states and 769 transitions. [2022-02-24 03:53:31,166 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-02-24 03:53:31,166 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.75) internal successors, (55), 19 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 61 [2022-02-24 03:53:31,166 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:53:31,167 INFO L225 Difference]: With dead ends: 658 [2022-02-24 03:53:31,167 INFO L226 Difference]: Without dead ends: 391 [2022-02-24 03:53:31,168 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 15 SyntacticMatches, 26 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=75, Invalid=387, Unknown=0, NotChecked=0, Total=462 [2022-02-24 03:53:31,168 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 39 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 1165 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 1175 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1165 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-02-24 03:53:31,168 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 46 Invalid, 1175 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 1165 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-02-24 03:53:31,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 391 states. [2022-02-24 03:53:31,595 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 391 to 288. [2022-02-24 03:53:31,596 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 288 states, 278 states have (on average 1.1906474820143884) internal successors, (331), 279 states have internal predecessors, (331), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:53:31,596 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 288 states to 288 states and 342 transitions. [2022-02-24 03:53:31,596 INFO L78 Accepts]: Start accepts. Automaton has 288 states and 342 transitions. Word has length 61 [2022-02-24 03:53:31,596 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:53:31,596 INFO L470 AbstractCegarLoop]: Abstraction has 288 states and 342 transitions. [2022-02-24 03:53:31,596 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.75) internal successors, (55), 19 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:53:31,596 INFO L276 IsEmpty]: Start isEmpty. Operand 288 states and 342 transitions. [2022-02-24 03:53:31,597 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-02-24 03:53:31,597 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:53:31,597 INFO L514 BasicCegarLoop]: trace histogram [13, 13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:53:31,597 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable96 [2022-02-24 03:53:31,597 INFO L402 AbstractCegarLoop]: === Iteration 98 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:53:31,597 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:53:31,597 INFO L85 PathProgramCache]: Analyzing trace with hash 831909855, now seen corresponding path program 67 times [2022-02-24 03:53:31,597 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:53:31,597 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1270986704] [2022-02-24 03:53:31,597 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:53:31,598 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:53:31,723 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:53:31,846 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:53:31,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:53:31,930 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:53:31,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:53:31,933 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:53:31,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:53:31,935 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 03:53:32,616 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:53:32,616 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1270986704] [2022-02-24 03:53:32,616 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1270986704] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:53:32,616 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:53:32,616 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2022-02-24 03:53:32,616 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1081876819] [2022-02-24 03:53:32,616 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:53:32,616 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-02-24 03:53:32,616 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:53:32,617 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-02-24 03:53:32,617 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=434, Unknown=0, NotChecked=0, Total=506 [2022-02-24 03:53:32,617 INFO L87 Difference]: Start difference. First operand 288 states and 342 transitions. Second operand has 21 states, 21 states have (on average 2.619047619047619) internal successors, (55), 20 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:53:33,957 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:53:33,957 INFO L93 Difference]: Finished difference Result 676 states and 787 transitions. [2022-02-24 03:53:33,959 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-02-24 03:53:33,959 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 2.619047619047619) internal successors, (55), 20 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 61 [2022-02-24 03:53:33,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:53:33,960 INFO L225 Difference]: With dead ends: 676 [2022-02-24 03:53:33,960 INFO L226 Difference]: Without dead ends: 400 [2022-02-24 03:53:33,960 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 14 SyntacticMatches, 25 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 202 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=84, Invalid=516, Unknown=0, NotChecked=0, Total=600 [2022-02-24 03:53:33,960 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 41 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 1129 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 1139 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1129 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-02-24 03:53:33,960 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [42 Valid, 51 Invalid, 1139 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 1129 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-02-24 03:53:33,961 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 400 states. [2022-02-24 03:53:34,404 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 400 to 288. [2022-02-24 03:53:34,404 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 288 states, 278 states have (on average 1.1906474820143884) internal successors, (331), 279 states have internal predecessors, (331), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:53:34,404 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 288 states to 288 states and 342 transitions. [2022-02-24 03:53:34,405 INFO L78 Accepts]: Start accepts. Automaton has 288 states and 342 transitions. Word has length 61 [2022-02-24 03:53:34,405 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:53:34,405 INFO L470 AbstractCegarLoop]: Abstraction has 288 states and 342 transitions. [2022-02-24 03:53:34,405 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 2.619047619047619) internal successors, (55), 20 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:53:34,405 INFO L276 IsEmpty]: Start isEmpty. Operand 288 states and 342 transitions. [2022-02-24 03:53:34,405 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-02-24 03:53:34,405 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:53:34,405 INFO L514 BasicCegarLoop]: trace histogram [13, 13, 11, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:53:34,405 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable97 [2022-02-24 03:53:34,405 INFO L402 AbstractCegarLoop]: === Iteration 99 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:53:34,405 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:53:34,406 INFO L85 PathProgramCache]: Analyzing trace with hash -1217477987, now seen corresponding path program 68 times [2022-02-24 03:53:34,406 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:53:34,406 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [619291948] [2022-02-24 03:53:34,406 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:53:34,406 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:53:34,520 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:53:34,635 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:53:34,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:53:34,708 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:53:34,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:53:34,711 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:53:34,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:53:34,712 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 03:53:35,279 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:53:35,279 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [619291948] [2022-02-24 03:53:35,279 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [619291948] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:53:35,279 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:53:35,279 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2022-02-24 03:53:35,279 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1110649127] [2022-02-24 03:53:35,279 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:53:35,280 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-02-24 03:53:35,280 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:53:35,280 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-02-24 03:53:35,280 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=472, Unknown=0, NotChecked=0, Total=552 [2022-02-24 03:53:35,280 INFO L87 Difference]: Start difference. First operand 288 states and 342 transitions. Second operand has 22 states, 22 states have (on average 2.5) internal successors, (55), 21 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:53:36,622 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:53:36,622 INFO L93 Difference]: Finished difference Result 670 states and 781 transitions. [2022-02-24 03:53:36,622 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-02-24 03:53:36,622 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.5) internal successors, (55), 21 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 61 [2022-02-24 03:53:36,622 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:53:36,623 INFO L225 Difference]: With dead ends: 670 [2022-02-24 03:53:36,623 INFO L226 Difference]: Without dead ends: 394 [2022-02-24 03:53:36,624 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 14 SyntacticMatches, 24 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 265 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=94, Invalid=556, Unknown=0, NotChecked=0, Total=650 [2022-02-24 03:53:36,624 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 48 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 1166 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 1177 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 1166 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-02-24 03:53:36,624 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [49 Valid, 45 Invalid, 1177 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 1166 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-02-24 03:53:36,624 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 394 states. [2022-02-24 03:53:37,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 394 to 288. [2022-02-24 03:53:37,080 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 288 states, 278 states have (on average 1.1906474820143884) internal successors, (331), 279 states have internal predecessors, (331), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:53:37,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 288 states to 288 states and 342 transitions. [2022-02-24 03:53:37,080 INFO L78 Accepts]: Start accepts. Automaton has 288 states and 342 transitions. Word has length 61 [2022-02-24 03:53:37,080 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:53:37,080 INFO L470 AbstractCegarLoop]: Abstraction has 288 states and 342 transitions. [2022-02-24 03:53:37,080 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 2.5) internal successors, (55), 21 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:53:37,080 INFO L276 IsEmpty]: Start isEmpty. Operand 288 states and 342 transitions. [2022-02-24 03:53:37,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-02-24 03:53:37,081 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:53:37,081 INFO L514 BasicCegarLoop]: trace histogram [13, 13, 10, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:53:37,081 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable98 [2022-02-24 03:53:37,081 INFO L402 AbstractCegarLoop]: === Iteration 100 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:53:37,081 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:53:37,081 INFO L85 PathProgramCache]: Analyzing trace with hash -793831265, now seen corresponding path program 69 times [2022-02-24 03:53:37,081 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:53:37,081 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1474069555] [2022-02-24 03:53:37,081 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:53:37,082 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:53:37,196 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:53:37,309 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:53:37,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:53:37,383 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:53:37,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:53:37,386 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:53:37,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:53:37,388 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 03:53:38,018 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:53:38,018 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1474069555] [2022-02-24 03:53:38,018 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1474069555] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:53:38,018 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:53:38,018 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2022-02-24 03:53:38,018 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1545841628] [2022-02-24 03:53:38,018 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:53:38,018 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-02-24 03:53:38,018 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:53:38,019 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-02-24 03:53:38,019 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=512, Unknown=0, NotChecked=0, Total=600 [2022-02-24 03:53:38,019 INFO L87 Difference]: Start difference. First operand 288 states and 342 transitions. Second operand has 23 states, 23 states have (on average 2.391304347826087) internal successors, (55), 22 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:53:39,418 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:53:39,419 INFO L93 Difference]: Finished difference Result 664 states and 775 transitions. [2022-02-24 03:53:39,419 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-02-24 03:53:39,419 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.391304347826087) internal successors, (55), 22 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 61 [2022-02-24 03:53:39,419 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:53:39,420 INFO L225 Difference]: With dead ends: 664 [2022-02-24 03:53:39,420 INFO L226 Difference]: Without dead ends: 388 [2022-02-24 03:53:39,420 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 14 SyntacticMatches, 23 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 319 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=104, Invalid=598, Unknown=0, NotChecked=0, Total=702 [2022-02-24 03:53:39,421 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 49 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 1285 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 1297 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 1285 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-02-24 03:53:39,421 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [50 Valid, 57 Invalid, 1297 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 1285 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-02-24 03:53:39,421 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 388 states. [2022-02-24 03:53:39,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 388 to 288. [2022-02-24 03:53:39,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 288 states, 278 states have (on average 1.1906474820143884) internal successors, (331), 279 states have internal predecessors, (331), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:53:39,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 288 states to 288 states and 342 transitions. [2022-02-24 03:53:39,901 INFO L78 Accepts]: Start accepts. Automaton has 288 states and 342 transitions. Word has length 61 [2022-02-24 03:53:39,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:53:39,901 INFO L470 AbstractCegarLoop]: Abstraction has 288 states and 342 transitions. [2022-02-24 03:53:39,901 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 2.391304347826087) internal successors, (55), 22 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:53:39,901 INFO L276 IsEmpty]: Start isEmpty. Operand 288 states and 342 transitions. [2022-02-24 03:53:39,902 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-02-24 03:53:39,902 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:53:39,902 INFO L514 BasicCegarLoop]: trace histogram [13, 13, 9, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:53:39,902 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable99 [2022-02-24 03:53:39,902 INFO L402 AbstractCegarLoop]: === Iteration 101 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:53:39,902 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:53:39,902 INFO L85 PathProgramCache]: Analyzing trace with hash -1823190563, now seen corresponding path program 70 times [2022-02-24 03:53:39,902 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:53:39,902 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [893344826] [2022-02-24 03:53:39,902 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:53:39,904 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:53:40,021 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:53:40,137 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:53:40,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:53:40,213 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:53:40,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:53:40,216 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:53:40,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:53:40,217 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 03:53:40,820 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:53:40,820 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [893344826] [2022-02-24 03:53:40,820 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [893344826] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:53:40,820 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:53:40,820 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2022-02-24 03:53:40,820 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1267041079] [2022-02-24 03:53:40,820 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:53:40,821 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-02-24 03:53:40,821 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:53:40,821 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-02-24 03:53:40,821 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=554, Unknown=0, NotChecked=0, Total=650 [2022-02-24 03:53:40,821 INFO L87 Difference]: Start difference. First operand 288 states and 342 transitions. Second operand has 24 states, 24 states have (on average 2.2916666666666665) internal successors, (55), 23 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:53:42,262 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:53:42,262 INFO L93 Difference]: Finished difference Result 658 states and 769 transitions. [2022-02-24 03:53:42,262 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-02-24 03:53:42,262 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.2916666666666665) internal successors, (55), 23 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 61 [2022-02-24 03:53:42,262 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:53:42,263 INFO L225 Difference]: With dead ends: 658 [2022-02-24 03:53:42,263 INFO L226 Difference]: Without dead ends: 382 [2022-02-24 03:53:42,264 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 14 SyntacticMatches, 22 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 364 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=114, Invalid=642, Unknown=0, NotChecked=0, Total=756 [2022-02-24 03:53:42,264 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 54 mSDsluCounter, 35 mSDsCounter, 0 mSdLazyCounter, 1327 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 1340 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 1327 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-02-24 03:53:42,264 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [55 Valid, 56 Invalid, 1340 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 1327 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-02-24 03:53:42,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 382 states. [2022-02-24 03:53:42,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 382 to 288. [2022-02-24 03:53:42,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 288 states, 278 states have (on average 1.1906474820143884) internal successors, (331), 279 states have internal predecessors, (331), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:53:42,760 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 288 states to 288 states and 342 transitions. [2022-02-24 03:53:42,760 INFO L78 Accepts]: Start accepts. Automaton has 288 states and 342 transitions. Word has length 61 [2022-02-24 03:53:42,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:53:42,760 INFO L470 AbstractCegarLoop]: Abstraction has 288 states and 342 transitions. [2022-02-24 03:53:42,760 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 2.2916666666666665) internal successors, (55), 23 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:53:42,760 INFO L276 IsEmpty]: Start isEmpty. Operand 288 states and 342 transitions. [2022-02-24 03:53:42,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-02-24 03:53:42,760 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:53:42,760 INFO L514 BasicCegarLoop]: trace histogram [13, 13, 8, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:53:42,760 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable100 [2022-02-24 03:53:42,761 INFO L402 AbstractCegarLoop]: === Iteration 102 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:53:42,761 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:53:42,761 INFO L85 PathProgramCache]: Analyzing trace with hash 1627771231, now seen corresponding path program 71 times [2022-02-24 03:53:42,761 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:53:42,761 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [882694426] [2022-02-24 03:53:42,761 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:53:42,762 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:53:42,880 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:53:42,997 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:53:42,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:53:43,073 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:53:43,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:53:43,076 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:53:43,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:53:43,077 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 03:53:43,694 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:53:43,694 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [882694426] [2022-02-24 03:53:43,694 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [882694426] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:53:43,694 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:53:43,694 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2022-02-24 03:53:43,694 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [328623024] [2022-02-24 03:53:43,694 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:53:43,694 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-02-24 03:53:43,694 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:53:43,695 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-02-24 03:53:43,695 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=598, Unknown=0, NotChecked=0, Total=702 [2022-02-24 03:53:43,695 INFO L87 Difference]: Start difference. First operand 288 states and 342 transitions. Second operand has 25 states, 25 states have (on average 2.2) internal successors, (55), 24 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:53:44,986 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:53:44,986 INFO L93 Difference]: Finished difference Result 652 states and 763 transitions. [2022-02-24 03:53:44,986 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-02-24 03:53:44,986 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.2) internal successors, (55), 24 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 61 [2022-02-24 03:53:44,987 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:53:44,987 INFO L225 Difference]: With dead ends: 652 [2022-02-24 03:53:44,987 INFO L226 Difference]: Without dead ends: 376 [2022-02-24 03:53:44,988 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 14 SyntacticMatches, 21 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 400 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=124, Invalid=688, Unknown=0, NotChecked=0, Total=812 [2022-02-24 03:53:44,988 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 64 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 1029 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 1043 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 1029 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-02-24 03:53:44,988 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [65 Valid, 43 Invalid, 1043 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 1029 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-02-24 03:53:44,988 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 376 states. [2022-02-24 03:53:45,487 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 376 to 288. [2022-02-24 03:53:45,488 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 288 states, 278 states have (on average 1.1906474820143884) internal successors, (331), 279 states have internal predecessors, (331), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:53:45,488 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 288 states to 288 states and 342 transitions. [2022-02-24 03:53:45,488 INFO L78 Accepts]: Start accepts. Automaton has 288 states and 342 transitions. Word has length 61 [2022-02-24 03:53:45,488 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:53:45,488 INFO L470 AbstractCegarLoop]: Abstraction has 288 states and 342 transitions. [2022-02-24 03:53:45,488 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 2.2) internal successors, (55), 24 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:53:45,488 INFO L276 IsEmpty]: Start isEmpty. Operand 288 states and 342 transitions. [2022-02-24 03:53:45,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-02-24 03:53:45,489 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:53:45,489 INFO L514 BasicCegarLoop]: trace histogram [13, 13, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:53:45,489 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable101 [2022-02-24 03:53:45,489 INFO L402 AbstractCegarLoop]: === Iteration 103 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:53:45,489 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:53:45,489 INFO L85 PathProgramCache]: Analyzing trace with hash 1902530845, now seen corresponding path program 72 times [2022-02-24 03:53:45,489 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:53:45,489 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [902892287] [2022-02-24 03:53:45,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:53:45,490 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:53:45,619 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:53:45,736 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:53:45,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:53:45,813 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:53:45,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:53:45,816 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:53:45,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:53:45,818 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 03:53:46,460 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:53:46,460 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [902892287] [2022-02-24 03:53:46,460 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [902892287] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:53:46,460 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:53:46,460 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2022-02-24 03:53:46,460 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1784425610] [2022-02-24 03:53:46,460 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:53:46,461 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-02-24 03:53:46,461 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:53:46,461 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-02-24 03:53:46,461 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=644, Unknown=0, NotChecked=0, Total=756 [2022-02-24 03:53:46,461 INFO L87 Difference]: Start difference. First operand 288 states and 342 transitions. Second operand has 26 states, 26 states have (on average 2.1153846153846154) internal successors, (55), 25 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:53:47,798 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:53:47,798 INFO L93 Difference]: Finished difference Result 646 states and 757 transitions. [2022-02-24 03:53:47,798 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-02-24 03:53:47,798 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.1153846153846154) internal successors, (55), 25 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 61 [2022-02-24 03:53:47,798 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:53:47,799 INFO L225 Difference]: With dead ends: 646 [2022-02-24 03:53:47,799 INFO L226 Difference]: Without dead ends: 370 [2022-02-24 03:53:47,799 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 14 SyntacticMatches, 20 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 427 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=134, Invalid=736, Unknown=0, NotChecked=0, Total=870 [2022-02-24 03:53:47,799 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 68 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 1152 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 47 SdHoareTripleChecker+Invalid, 1167 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 1152 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-02-24 03:53:47,799 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [69 Valid, 47 Invalid, 1167 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 1152 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-02-24 03:53:47,800 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 370 states. [2022-02-24 03:53:48,297 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 370 to 288. [2022-02-24 03:53:48,297 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 288 states, 278 states have (on average 1.1906474820143884) internal successors, (331), 279 states have internal predecessors, (331), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:53:48,298 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 288 states to 288 states and 342 transitions. [2022-02-24 03:53:48,298 INFO L78 Accepts]: Start accepts. Automaton has 288 states and 342 transitions. Word has length 61 [2022-02-24 03:53:48,298 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:53:48,298 INFO L470 AbstractCegarLoop]: Abstraction has 288 states and 342 transitions. [2022-02-24 03:53:48,298 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 2.1153846153846154) internal successors, (55), 25 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:53:48,298 INFO L276 IsEmpty]: Start isEmpty. Operand 288 states and 342 transitions. [2022-02-24 03:53:48,298 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-02-24 03:53:48,298 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:53:48,298 INFO L514 BasicCegarLoop]: trace histogram [13, 13, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:53:48,298 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable102 [2022-02-24 03:53:48,298 INFO L402 AbstractCegarLoop]: === Iteration 104 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:53:48,299 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:53:48,299 INFO L85 PathProgramCache]: Analyzing trace with hash -1006233057, now seen corresponding path program 73 times [2022-02-24 03:53:48,299 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:53:48,299 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1777187062] [2022-02-24 03:53:48,299 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:53:48,299 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:53:48,427 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:53:48,554 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:53:48,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:53:48,637 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:53:48,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:53:48,640 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:53:48,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:53:48,641 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 03:53:49,321 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:53:49,321 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1777187062] [2022-02-24 03:53:49,321 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1777187062] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:53:49,321 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:53:49,321 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2022-02-24 03:53:49,321 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1386231484] [2022-02-24 03:53:49,321 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:53:49,321 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-02-24 03:53:49,321 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:53:49,322 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-02-24 03:53:49,322 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=692, Unknown=0, NotChecked=0, Total=812 [2022-02-24 03:53:49,322 INFO L87 Difference]: Start difference. First operand 288 states and 342 transitions. Second operand has 27 states, 27 states have (on average 2.037037037037037) internal successors, (55), 26 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:53:50,734 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:53:50,735 INFO L93 Difference]: Finished difference Result 640 states and 751 transitions. [2022-02-24 03:53:50,735 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-02-24 03:53:50,735 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 2.037037037037037) internal successors, (55), 26 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 61 [2022-02-24 03:53:50,735 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:53:50,736 INFO L225 Difference]: With dead ends: 640 [2022-02-24 03:53:50,736 INFO L226 Difference]: Without dead ends: 364 [2022-02-24 03:53:50,736 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 14 SyntacticMatches, 19 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 445 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=144, Invalid=786, Unknown=0, NotChecked=0, Total=930 [2022-02-24 03:53:50,736 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 76 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 1420 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 77 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 1436 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 1420 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-02-24 03:53:50,736 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [77 Valid, 42 Invalid, 1436 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 1420 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-02-24 03:53:50,737 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 364 states. [2022-02-24 03:53:51,252 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 364 to 288. [2022-02-24 03:53:51,253 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 288 states, 278 states have (on average 1.1906474820143884) internal successors, (331), 279 states have internal predecessors, (331), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:53:51,253 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 288 states to 288 states and 342 transitions. [2022-02-24 03:53:51,253 INFO L78 Accepts]: Start accepts. Automaton has 288 states and 342 transitions. Word has length 61 [2022-02-24 03:53:51,253 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:53:51,253 INFO L470 AbstractCegarLoop]: Abstraction has 288 states and 342 transitions. [2022-02-24 03:53:51,253 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 2.037037037037037) internal successors, (55), 26 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:53:51,253 INFO L276 IsEmpty]: Start isEmpty. Operand 288 states and 342 transitions. [2022-02-24 03:53:51,254 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-02-24 03:53:51,254 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:53:51,254 INFO L514 BasicCegarLoop]: trace histogram [13, 13, 8, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:53:51,254 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable103 [2022-02-24 03:53:51,254 INFO L402 AbstractCegarLoop]: === Iteration 105 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:53:51,254 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:53:51,254 INFO L85 PathProgramCache]: Analyzing trace with hash -944193443, now seen corresponding path program 74 times [2022-02-24 03:53:51,254 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:53:51,254 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1963929580] [2022-02-24 03:53:51,254 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:53:51,255 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:53:51,376 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:53:51,493 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:53:51,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:53:51,570 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:53:51,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:53:51,578 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:53:51,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:53:51,579 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 03:53:52,213 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:53:52,214 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1963929580] [2022-02-24 03:53:52,214 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1963929580] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:53:52,214 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:53:52,214 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [] total 28 [2022-02-24 03:53:52,214 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1338263519] [2022-02-24 03:53:52,214 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:53:52,214 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-02-24 03:53:52,214 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:53:52,214 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-02-24 03:53:52,214 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=742, Unknown=0, NotChecked=0, Total=870 [2022-02-24 03:53:52,215 INFO L87 Difference]: Start difference. First operand 288 states and 342 transitions. Second operand has 28 states, 28 states have (on average 1.9642857142857142) internal successors, (55), 27 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:53:53,708 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:53:53,708 INFO L93 Difference]: Finished difference Result 634 states and 745 transitions. [2022-02-24 03:53:53,708 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-02-24 03:53:53,708 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.9642857142857142) internal successors, (55), 27 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 61 [2022-02-24 03:53:53,708 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:53:53,709 INFO L225 Difference]: With dead ends: 634 [2022-02-24 03:53:53,709 INFO L226 Difference]: Without dead ends: 358 [2022-02-24 03:53:53,709 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 14 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 454 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=154, Invalid=838, Unknown=0, NotChecked=0, Total=992 [2022-02-24 03:53:53,710 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 66 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 1654 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 1671 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 1654 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-02-24 03:53:53,710 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [67 Valid, 63 Invalid, 1671 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 1654 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-02-24 03:53:53,710 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 358 states. [2022-02-24 03:53:54,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 358 to 288. [2022-02-24 03:53:54,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 288 states, 278 states have (on average 1.1906474820143884) internal successors, (331), 279 states have internal predecessors, (331), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:53:54,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 288 states to 288 states and 342 transitions. [2022-02-24 03:53:54,206 INFO L78 Accepts]: Start accepts. Automaton has 288 states and 342 transitions. Word has length 61 [2022-02-24 03:53:54,206 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:53:54,206 INFO L470 AbstractCegarLoop]: Abstraction has 288 states and 342 transitions. [2022-02-24 03:53:54,206 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 1.9642857142857142) internal successors, (55), 27 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:53:54,206 INFO L276 IsEmpty]: Start isEmpty. Operand 288 states and 342 transitions. [2022-02-24 03:53:54,206 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-02-24 03:53:54,206 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:53:54,206 INFO L514 BasicCegarLoop]: trace histogram [13, 13, 9, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:53:54,206 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable104 [2022-02-24 03:53:54,207 INFO L402 AbstractCegarLoop]: === Iteration 106 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:53:54,207 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:53:54,207 INFO L85 PathProgramCache]: Analyzing trace with hash 1545335519, now seen corresponding path program 75 times [2022-02-24 03:53:54,207 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:53:54,207 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1717600882] [2022-02-24 03:53:54,207 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:53:54,207 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:53:54,322 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:53:54,437 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:53:54,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:53:54,531 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:53:54,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:53:54,534 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:53:54,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:53:54,536 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 03:53:55,293 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:53:55,294 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1717600882] [2022-02-24 03:53:55,294 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1717600882] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:53:55,294 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:53:55,294 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2022-02-24 03:53:55,294 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1705795462] [2022-02-24 03:53:55,294 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:53:55,294 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-02-24 03:53:55,294 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:53:55,294 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-02-24 03:53:55,295 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=794, Unknown=0, NotChecked=0, Total=930 [2022-02-24 03:53:55,295 INFO L87 Difference]: Start difference. First operand 288 states and 342 transitions. Second operand has 29 states, 29 states have (on average 1.896551724137931) internal successors, (55), 28 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:53:56,802 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:53:56,802 INFO L93 Difference]: Finished difference Result 628 states and 739 transitions. [2022-02-24 03:53:56,802 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-02-24 03:53:56,803 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.896551724137931) internal successors, (55), 28 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 61 [2022-02-24 03:53:56,803 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:53:56,803 INFO L225 Difference]: With dead ends: 628 [2022-02-24 03:53:56,803 INFO L226 Difference]: Without dead ends: 352 [2022-02-24 03:53:56,804 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 14 SyntacticMatches, 17 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 454 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=164, Invalid=892, Unknown=0, NotChecked=0, Total=1056 [2022-02-24 03:53:56,804 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 72 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 1434 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 54 SdHoareTripleChecker+Invalid, 1452 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 1434 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-02-24 03:53:56,804 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [73 Valid, 54 Invalid, 1452 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 1434 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-02-24 03:53:56,804 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 352 states. [2022-02-24 03:53:57,301 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 352 to 288. [2022-02-24 03:53:57,301 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 288 states, 278 states have (on average 1.1906474820143884) internal successors, (331), 279 states have internal predecessors, (331), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:53:57,302 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 288 states to 288 states and 342 transitions. [2022-02-24 03:53:57,302 INFO L78 Accepts]: Start accepts. Automaton has 288 states and 342 transitions. Word has length 61 [2022-02-24 03:53:57,302 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:53:57,302 INFO L470 AbstractCegarLoop]: Abstraction has 288 states and 342 transitions. [2022-02-24 03:53:57,302 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.896551724137931) internal successors, (55), 28 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:53:57,302 INFO L276 IsEmpty]: Start isEmpty. Operand 288 states and 342 transitions. [2022-02-24 03:53:57,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-02-24 03:53:57,302 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:53:57,302 INFO L514 BasicCegarLoop]: trace histogram [13, 13, 10, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:53:57,302 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable105 [2022-02-24 03:53:57,302 INFO L402 AbstractCegarLoop]: === Iteration 107 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:53:57,303 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:53:57,303 INFO L85 PathProgramCache]: Analyzing trace with hash 727687069, now seen corresponding path program 76 times [2022-02-24 03:53:57,303 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:53:57,303 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1632251698] [2022-02-24 03:53:57,303 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:53:57,303 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:53:57,427 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:53:57,541 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:53:57,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:53:57,614 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:53:57,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:53:57,617 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:53:57,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:53:57,618 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 03:53:58,379 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:53:58,380 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1632251698] [2022-02-24 03:53:58,380 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1632251698] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:53:58,380 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:53:58,380 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2022-02-24 03:53:58,380 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [203122029] [2022-02-24 03:53:58,380 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:53:58,380 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-02-24 03:53:58,380 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:53:58,380 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-02-24 03:53:58,380 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=848, Unknown=0, NotChecked=0, Total=992 [2022-02-24 03:53:58,381 INFO L87 Difference]: Start difference. First operand 288 states and 342 transitions. Second operand has 30 states, 30 states have (on average 1.8333333333333333) internal successors, (55), 29 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:53:59,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:53:59,942 INFO L93 Difference]: Finished difference Result 622 states and 733 transitions. [2022-02-24 03:53:59,943 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-02-24 03:53:59,943 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 1.8333333333333333) internal successors, (55), 29 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 61 [2022-02-24 03:53:59,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:53:59,943 INFO L225 Difference]: With dead ends: 622 [2022-02-24 03:53:59,943 INFO L226 Difference]: Without dead ends: 346 [2022-02-24 03:53:59,944 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 14 SyntacticMatches, 16 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 445 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=174, Invalid=948, Unknown=0, NotChecked=0, Total=1122 [2022-02-24 03:53:59,944 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 79 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 1642 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 80 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 1661 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 1642 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-02-24 03:53:59,944 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [80 Valid, 55 Invalid, 1661 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 1642 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-02-24 03:53:59,944 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 346 states. [2022-02-24 03:54:00,468 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 346 to 288. [2022-02-24 03:54:00,468 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 288 states, 278 states have (on average 1.1906474820143884) internal successors, (331), 279 states have internal predecessors, (331), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:54:00,469 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 288 states to 288 states and 342 transitions. [2022-02-24 03:54:00,469 INFO L78 Accepts]: Start accepts. Automaton has 288 states and 342 transitions. Word has length 61 [2022-02-24 03:54:00,469 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:54:00,469 INFO L470 AbstractCegarLoop]: Abstraction has 288 states and 342 transitions. [2022-02-24 03:54:00,469 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 1.8333333333333333) internal successors, (55), 29 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:54:00,469 INFO L276 IsEmpty]: Start isEmpty. Operand 288 states and 342 transitions. [2022-02-24 03:54:00,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-02-24 03:54:00,469 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:54:00,469 INFO L514 BasicCegarLoop]: trace histogram [13, 13, 11, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:54:00,469 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable106 [2022-02-24 03:54:00,470 INFO L402 AbstractCegarLoop]: === Iteration 108 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:54:00,470 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:54:00,470 INFO L85 PathProgramCache]: Analyzing trace with hash -860660833, now seen corresponding path program 77 times [2022-02-24 03:54:00,470 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:54:00,470 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1123880713] [2022-02-24 03:54:00,470 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:54:00,470 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:54:00,597 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:54:00,715 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:54:00,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:54:00,796 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:54:00,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:54:00,799 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:54:00,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:54:00,800 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 03:54:01,552 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:54:01,552 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1123880713] [2022-02-24 03:54:01,552 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1123880713] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:54:01,552 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:54:01,552 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2022-02-24 03:54:01,552 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [641809780] [2022-02-24 03:54:01,552 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:54:01,552 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-02-24 03:54:01,552 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:54:01,553 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-02-24 03:54:01,553 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=152, Invalid=904, Unknown=0, NotChecked=0, Total=1056 [2022-02-24 03:54:01,553 INFO L87 Difference]: Start difference. First operand 288 states and 342 transitions. Second operand has 31 states, 31 states have (on average 1.7741935483870968) internal successors, (55), 30 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:54:02,880 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:54:02,880 INFO L93 Difference]: Finished difference Result 616 states and 727 transitions. [2022-02-24 03:54:02,881 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2022-02-24 03:54:02,881 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.7741935483870968) internal successors, (55), 30 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 61 [2022-02-24 03:54:02,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:54:02,882 INFO L225 Difference]: With dead ends: 616 [2022-02-24 03:54:02,882 INFO L226 Difference]: Without dead ends: 340 [2022-02-24 03:54:02,882 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 14 SyntacticMatches, 15 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 427 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=184, Invalid=1006, Unknown=0, NotChecked=0, Total=1190 [2022-02-24 03:54:02,882 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 92 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 1233 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 93 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 1253 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 1233 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-02-24 03:54:02,882 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [93 Valid, 34 Invalid, 1253 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 1233 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-02-24 03:54:02,882 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 340 states. [2022-02-24 03:54:03,376 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 340 to 288. [2022-02-24 03:54:03,376 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 288 states, 278 states have (on average 1.1906474820143884) internal successors, (331), 279 states have internal predecessors, (331), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:54:03,377 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 288 states to 288 states and 342 transitions. [2022-02-24 03:54:03,377 INFO L78 Accepts]: Start accepts. Automaton has 288 states and 342 transitions. Word has length 61 [2022-02-24 03:54:03,377 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:54:03,377 INFO L470 AbstractCegarLoop]: Abstraction has 288 states and 342 transitions. [2022-02-24 03:54:03,377 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 1.7741935483870968) internal successors, (55), 30 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:54:03,377 INFO L276 IsEmpty]: Start isEmpty. Operand 288 states and 342 transitions. [2022-02-24 03:54:03,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-02-24 03:54:03,377 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:54:03,377 INFO L514 BasicCegarLoop]: trace histogram [13, 13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:54:03,377 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable107 [2022-02-24 03:54:03,377 INFO L402 AbstractCegarLoop]: === Iteration 109 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:54:03,378 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:54:03,378 INFO L85 PathProgramCache]: Analyzing trace with hash -1871778083, now seen corresponding path program 78 times [2022-02-24 03:54:03,378 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:54:03,378 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [206283032] [2022-02-24 03:54:03,378 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:54:03,378 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:54:03,418 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:54:03,538 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:54:03,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:54:03,618 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:54:03,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:54:03,621 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:54:03,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:54:03,622 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 03:54:04,385 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:54:04,385 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [206283032] [2022-02-24 03:54:04,385 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [206283032] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:54:04,385 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:54:04,386 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2022-02-24 03:54:04,386 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1100878496] [2022-02-24 03:54:04,386 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:54:04,386 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-02-24 03:54:04,386 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:54:04,386 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-02-24 03:54:04,386 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=160, Invalid=962, Unknown=0, NotChecked=0, Total=1122 [2022-02-24 03:54:04,386 INFO L87 Difference]: Start difference. First operand 288 states and 342 transitions. Second operand has 32 states, 32 states have (on average 1.71875) internal successors, (55), 31 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:54:05,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:54:05,741 INFO L93 Difference]: Finished difference Result 616 states and 730 transitions. [2022-02-24 03:54:05,741 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-02-24 03:54:05,741 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.71875) internal successors, (55), 31 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 61 [2022-02-24 03:54:05,742 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:54:05,742 INFO L225 Difference]: With dead ends: 616 [2022-02-24 03:54:05,742 INFO L226 Difference]: Without dead ends: 340 [2022-02-24 03:54:05,742 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 14 SyntacticMatches, 14 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 400 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=194, Invalid=1066, Unknown=0, NotChecked=0, Total=1260 [2022-02-24 03:54:05,743 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 99 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 1355 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 100 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 1376 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 1355 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-02-24 03:54:05,743 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [100 Valid, 39 Invalid, 1376 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 1355 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-02-24 03:54:05,743 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 340 states. [2022-02-24 03:54:06,252 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 340 to 291. [2022-02-24 03:54:06,253 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 291 states, 281 states have (on average 1.199288256227758) internal successors, (337), 282 states have internal predecessors, (337), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:54:06,253 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 291 states to 291 states and 348 transitions. [2022-02-24 03:54:06,253 INFO L78 Accepts]: Start accepts. Automaton has 291 states and 348 transitions. Word has length 61 [2022-02-24 03:54:06,253 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:54:06,253 INFO L470 AbstractCegarLoop]: Abstraction has 291 states and 348 transitions. [2022-02-24 03:54:06,254 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 1.71875) internal successors, (55), 31 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:54:06,254 INFO L276 IsEmpty]: Start isEmpty. Operand 291 states and 348 transitions. [2022-02-24 03:54:06,254 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-02-24 03:54:06,254 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:54:06,254 INFO L514 BasicCegarLoop]: trace histogram [13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:54:06,254 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable108 [2022-02-24 03:54:06,254 INFO L402 AbstractCegarLoop]: === Iteration 110 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:54:06,254 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:54:06,254 INFO L85 PathProgramCache]: Analyzing trace with hash -2037318433, now seen corresponding path program 13 times [2022-02-24 03:54:06,254 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:54:06,254 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1970960638] [2022-02-24 03:54:06,255 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:54:06,255 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:54:06,297 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:54:06,337 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:54:06,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:54:06,365 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:54:06,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:54:06,368 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:54:06,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:54:06,369 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 03:54:07,038 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:54:07,039 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1970960638] [2022-02-24 03:54:07,039 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1970960638] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:54:07,039 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:54:07,039 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2022-02-24 03:54:07,039 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [562724623] [2022-02-24 03:54:07,039 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:54:07,039 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-02-24 03:54:07,039 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:54:07,039 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-02-24 03:54:07,039 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=889, Unknown=0, NotChecked=0, Total=992 [2022-02-24 03:54:07,040 INFO L87 Difference]: Start difference. First operand 291 states and 348 transitions. Second operand has 31 states, 31 states have (on average 1.7741935483870968) internal successors, (55), 30 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:54:08,742 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:54:08,742 INFO L93 Difference]: Finished difference Result 622 states and 742 transitions. [2022-02-24 03:54:08,743 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2022-02-24 03:54:08,743 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.7741935483870968) internal successors, (55), 30 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 61 [2022-02-24 03:54:08,744 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:54:08,744 INFO L225 Difference]: With dead ends: 622 [2022-02-24 03:54:08,744 INFO L226 Difference]: Without dead ends: 343 [2022-02-24 03:54:08,744 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 13 SyntacticMatches, 14 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 303 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=107, Invalid=949, Unknown=0, NotChecked=0, Total=1056 [2022-02-24 03:54:08,745 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 72 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 2020 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 2025 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 2020 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-02-24 03:54:08,745 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [73 Valid, 51 Invalid, 2025 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 2020 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-02-24 03:54:08,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 343 states. [2022-02-24 03:54:09,252 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 343 to 297. [2022-02-24 03:54:09,252 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 297 states, 287 states have (on average 1.1951219512195121) internal successors, (343), 288 states have internal predecessors, (343), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:54:09,253 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 297 states to 297 states and 354 transitions. [2022-02-24 03:54:09,253 INFO L78 Accepts]: Start accepts. Automaton has 297 states and 354 transitions. Word has length 61 [2022-02-24 03:54:09,253 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:54:09,253 INFO L470 AbstractCegarLoop]: Abstraction has 297 states and 354 transitions. [2022-02-24 03:54:09,253 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 1.7741935483870968) internal successors, (55), 30 states have internal predecessors, (55), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:54:09,253 INFO L276 IsEmpty]: Start isEmpty. Operand 297 states and 354 transitions. [2022-02-24 03:54:09,253 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-02-24 03:54:09,253 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:54:09,253 INFO L514 BasicCegarLoop]: trace histogram [14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:54:09,253 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable109 [2022-02-24 03:54:09,253 INFO L402 AbstractCegarLoop]: === Iteration 111 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:54:09,254 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:54:09,254 INFO L85 PathProgramCache]: Analyzing trace with hash -1565519746, now seen corresponding path program 14 times [2022-02-24 03:54:09,254 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:54:09,254 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1936287282] [2022-02-24 03:54:09,254 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:54:09,254 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:54:09,337 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:54:09,417 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:54:09,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:54:09,465 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:54:09,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:54:09,468 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:54:09,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:54:09,469 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 03:54:10,025 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:54:10,026 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1936287282] [2022-02-24 03:54:10,026 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1936287282] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:54:10,026 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:54:10,026 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2022-02-24 03:54:10,026 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [121293343] [2022-02-24 03:54:10,026 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:54:10,026 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-02-24 03:54:10,026 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:54:10,026 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-02-24 03:54:10,026 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=387, Unknown=0, NotChecked=0, Total=462 [2022-02-24 03:54:10,027 INFO L87 Difference]: Start difference. First operand 297 states and 354 transitions. Second operand has 21 states, 21 states have (on average 2.761904761904762) internal successors, (58), 20 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:54:11,522 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:54:11,522 INFO L93 Difference]: Finished difference Result 703 states and 820 transitions. [2022-02-24 03:54:11,523 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-02-24 03:54:11,523 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 2.761904761904762) internal successors, (58), 20 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 64 [2022-02-24 03:54:11,523 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:54:11,524 INFO L225 Difference]: With dead ends: 703 [2022-02-24 03:54:11,524 INFO L226 Difference]: Without dead ends: 418 [2022-02-24 03:54:11,524 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 15 SyntacticMatches, 28 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 104 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=79, Invalid=427, Unknown=0, NotChecked=0, Total=506 [2022-02-24 03:54:11,524 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 37 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 1221 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 1231 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1221 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-02-24 03:54:11,524 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 57 Invalid, 1231 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 1221 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-02-24 03:54:11,525 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 418 states. [2022-02-24 03:54:12,091 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 418 to 306. [2022-02-24 03:54:12,091 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 306 states, 296 states have (on average 1.1891891891891893) internal successors, (352), 297 states have internal predecessors, (352), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:54:12,092 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 306 states to 306 states and 363 transitions. [2022-02-24 03:54:12,092 INFO L78 Accepts]: Start accepts. Automaton has 306 states and 363 transitions. Word has length 64 [2022-02-24 03:54:12,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:54:12,092 INFO L470 AbstractCegarLoop]: Abstraction has 306 states and 363 transitions. [2022-02-24 03:54:12,092 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 2.761904761904762) internal successors, (58), 20 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:54:12,092 INFO L276 IsEmpty]: Start isEmpty. Operand 306 states and 363 transitions. [2022-02-24 03:54:12,092 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-02-24 03:54:12,092 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:54:12,092 INFO L514 BasicCegarLoop]: trace histogram [14, 14, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:54:12,092 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable110 [2022-02-24 03:54:12,092 INFO L402 AbstractCegarLoop]: === Iteration 112 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:54:12,093 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:54:12,093 INFO L85 PathProgramCache]: Analyzing trace with hash -2046600004, now seen corresponding path program 79 times [2022-02-24 03:54:12,093 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:54:12,093 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [493620504] [2022-02-24 03:54:12,093 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:54:12,093 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:54:12,215 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:54:12,336 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:54:12,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:54:12,427 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:54:12,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:54:12,430 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:54:12,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:54:12,432 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 03:54:13,168 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:54:13,168 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [493620504] [2022-02-24 03:54:13,168 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [493620504] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:54:13,168 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:54:13,168 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2022-02-24 03:54:13,168 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [675227683] [2022-02-24 03:54:13,168 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:54:13,168 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-02-24 03:54:13,168 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:54:13,168 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-02-24 03:54:13,169 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=477, Unknown=0, NotChecked=0, Total=552 [2022-02-24 03:54:13,169 INFO L87 Difference]: Start difference. First operand 306 states and 363 transitions. Second operand has 22 states, 22 states have (on average 2.6363636363636362) internal successors, (58), 21 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:54:14,806 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:54:14,806 INFO L93 Difference]: Finished difference Result 721 states and 838 transitions. [2022-02-24 03:54:14,806 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-02-24 03:54:14,806 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.6363636363636362) internal successors, (58), 21 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 64 [2022-02-24 03:54:14,806 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:54:14,807 INFO L225 Difference]: With dead ends: 721 [2022-02-24 03:54:14,807 INFO L226 Difference]: Without dead ends: 427 [2022-02-24 03:54:14,808 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 14 SyntacticMatches, 27 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 217 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=87, Invalid=563, Unknown=0, NotChecked=0, Total=650 [2022-02-24 03:54:14,808 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 42 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 1183 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 1193 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1183 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-02-24 03:54:14,808 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [43 Valid, 49 Invalid, 1193 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 1183 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-02-24 03:54:14,809 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 427 states. [2022-02-24 03:54:15,394 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 427 to 306. [2022-02-24 03:54:15,394 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 306 states, 296 states have (on average 1.1891891891891893) internal successors, (352), 297 states have internal predecessors, (352), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:54:15,394 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 306 states to 306 states and 363 transitions. [2022-02-24 03:54:15,395 INFO L78 Accepts]: Start accepts. Automaton has 306 states and 363 transitions. Word has length 64 [2022-02-24 03:54:15,395 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:54:15,395 INFO L470 AbstractCegarLoop]: Abstraction has 306 states and 363 transitions. [2022-02-24 03:54:15,395 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 2.6363636363636362) internal successors, (58), 21 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:54:15,395 INFO L276 IsEmpty]: Start isEmpty. Operand 306 states and 363 transitions. [2022-02-24 03:54:15,395 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-02-24 03:54:15,395 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:54:15,395 INFO L514 BasicCegarLoop]: trace histogram [14, 14, 12, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:54:15,395 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable111 [2022-02-24 03:54:15,395 INFO L402 AbstractCegarLoop]: === Iteration 113 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:54:15,395 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:54:15,395 INFO L85 PathProgramCache]: Analyzing trace with hash 1895278910, now seen corresponding path program 80 times [2022-02-24 03:54:15,396 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:54:15,396 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [772840469] [2022-02-24 03:54:15,396 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:54:15,396 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:54:15,524 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:54:15,658 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:54:15,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:54:15,750 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:54:15,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:54:15,753 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:54:15,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:54:15,755 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 03:54:16,466 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:54:16,466 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [772840469] [2022-02-24 03:54:16,466 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [772840469] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:54:16,466 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:54:16,466 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2022-02-24 03:54:16,466 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1028430932] [2022-02-24 03:54:16,466 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:54:16,467 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-02-24 03:54:16,467 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:54:16,467 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-02-24 03:54:16,467 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=517, Unknown=0, NotChecked=0, Total=600 [2022-02-24 03:54:16,467 INFO L87 Difference]: Start difference. First operand 306 states and 363 transitions. Second operand has 23 states, 23 states have (on average 2.5217391304347827) internal successors, (58), 22 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:54:18,131 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:54:18,131 INFO L93 Difference]: Finished difference Result 715 states and 832 transitions. [2022-02-24 03:54:18,131 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-02-24 03:54:18,132 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.5217391304347827) internal successors, (58), 22 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 64 [2022-02-24 03:54:18,132 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:54:18,132 INFO L225 Difference]: With dead ends: 715 [2022-02-24 03:54:18,132 INFO L226 Difference]: Without dead ends: 421 [2022-02-24 03:54:18,133 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 14 SyntacticMatches, 26 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 286 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=97, Invalid=605, Unknown=0, NotChecked=0, Total=702 [2022-02-24 03:54:18,133 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 47 mSDsluCounter, 31 mSDsCounter, 0 mSdLazyCounter, 1156 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 1167 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 1156 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-02-24 03:54:18,133 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 52 Invalid, 1167 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 1156 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-02-24 03:54:18,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 421 states. [2022-02-24 03:54:18,768 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 421 to 306. [2022-02-24 03:54:18,769 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 306 states, 296 states have (on average 1.1891891891891893) internal successors, (352), 297 states have internal predecessors, (352), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:54:18,769 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 306 states to 306 states and 363 transitions. [2022-02-24 03:54:18,769 INFO L78 Accepts]: Start accepts. Automaton has 306 states and 363 transitions. Word has length 64 [2022-02-24 03:54:18,769 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:54:18,769 INFO L470 AbstractCegarLoop]: Abstraction has 306 states and 363 transitions. [2022-02-24 03:54:18,769 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 2.5217391304347827) internal successors, (58), 22 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:54:18,769 INFO L276 IsEmpty]: Start isEmpty. Operand 306 states and 363 transitions. [2022-02-24 03:54:18,769 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-02-24 03:54:18,769 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:54:18,769 INFO L514 BasicCegarLoop]: trace histogram [14, 14, 11, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:54:18,770 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable112 [2022-02-24 03:54:18,770 INFO L402 AbstractCegarLoop]: === Iteration 114 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:54:18,770 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:54:18,770 INFO L85 PathProgramCache]: Analyzing trace with hash -154108932, now seen corresponding path program 81 times [2022-02-24 03:54:18,770 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:54:18,770 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2079617863] [2022-02-24 03:54:18,770 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:54:18,770 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:54:18,889 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:54:19,004 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:54:19,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:54:19,089 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:54:19,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:54:19,091 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:54:19,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:54:19,093 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 03:54:19,784 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:54:19,784 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2079617863] [2022-02-24 03:54:19,784 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [2079617863] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:54:19,784 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:54:19,784 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2022-02-24 03:54:19,784 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [442573324] [2022-02-24 03:54:19,784 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:54:19,787 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-02-24 03:54:19,787 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:54:19,787 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-02-24 03:54:19,787 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=559, Unknown=0, NotChecked=0, Total=650 [2022-02-24 03:54:19,787 INFO L87 Difference]: Start difference. First operand 306 states and 363 transitions. Second operand has 24 states, 24 states have (on average 2.4166666666666665) internal successors, (58), 23 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:54:21,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:54:21,420 INFO L93 Difference]: Finished difference Result 709 states and 826 transitions. [2022-02-24 03:54:21,420 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-02-24 03:54:21,420 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.4166666666666665) internal successors, (58), 23 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 64 [2022-02-24 03:54:21,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:54:21,421 INFO L225 Difference]: With dead ends: 709 [2022-02-24 03:54:21,421 INFO L226 Difference]: Without dead ends: 415 [2022-02-24 03:54:21,422 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 14 SyntacticMatches, 25 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 346 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=107, Invalid=649, Unknown=0, NotChecked=0, Total=756 [2022-02-24 03:54:21,422 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 56 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 1163 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 1175 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 1163 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-02-24 03:54:21,422 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [57 Valid, 46 Invalid, 1175 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 1163 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-02-24 03:54:21,422 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 415 states. [2022-02-24 03:54:22,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 415 to 306. [2022-02-24 03:54:22,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 306 states, 296 states have (on average 1.1891891891891893) internal successors, (352), 297 states have internal predecessors, (352), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:54:22,054 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 306 states to 306 states and 363 transitions. [2022-02-24 03:54:22,054 INFO L78 Accepts]: Start accepts. Automaton has 306 states and 363 transitions. Word has length 64 [2022-02-24 03:54:22,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:54:22,054 INFO L470 AbstractCegarLoop]: Abstraction has 306 states and 363 transitions. [2022-02-24 03:54:22,054 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 2.4166666666666665) internal successors, (58), 23 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:54:22,054 INFO L276 IsEmpty]: Start isEmpty. Operand 306 states and 363 transitions. [2022-02-24 03:54:22,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-02-24 03:54:22,054 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:54:22,054 INFO L514 BasicCegarLoop]: trace histogram [14, 14, 10, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:54:22,054 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable113 [2022-02-24 03:54:22,054 INFO L402 AbstractCegarLoop]: === Iteration 115 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:54:22,055 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:54:22,055 INFO L85 PathProgramCache]: Analyzing trace with hash 269537790, now seen corresponding path program 82 times [2022-02-24 03:54:22,055 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:54:22,055 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2123293478] [2022-02-24 03:54:22,055 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:54:22,055 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:54:22,174 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:54:22,289 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:54:22,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:54:22,365 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:54:22,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:54:22,368 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:54:22,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:54:22,369 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 03:54:23,078 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:54:23,078 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2123293478] [2022-02-24 03:54:23,078 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [2123293478] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:54:23,078 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:54:23,078 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2022-02-24 03:54:23,078 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [743422547] [2022-02-24 03:54:23,078 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:54:23,078 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-02-24 03:54:23,078 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:54:23,079 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-02-24 03:54:23,079 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=603, Unknown=0, NotChecked=0, Total=702 [2022-02-24 03:54:23,079 INFO L87 Difference]: Start difference. First operand 306 states and 363 transitions. Second operand has 25 states, 25 states have (on average 2.32) internal successors, (58), 24 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:54:24,650 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:54:24,651 INFO L93 Difference]: Finished difference Result 703 states and 820 transitions. [2022-02-24 03:54:24,651 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-02-24 03:54:24,651 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.32) internal successors, (58), 24 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 64 [2022-02-24 03:54:24,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:54:24,652 INFO L225 Difference]: With dead ends: 703 [2022-02-24 03:54:24,652 INFO L226 Difference]: Without dead ends: 409 [2022-02-24 03:54:24,652 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 14 SyntacticMatches, 24 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 397 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=117, Invalid=695, Unknown=0, NotChecked=0, Total=812 [2022-02-24 03:54:24,652 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 60 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 1114 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 1127 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 1114 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-02-24 03:54:24,652 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [61 Valid, 44 Invalid, 1127 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 1114 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-02-24 03:54:24,653 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 409 states. [2022-02-24 03:54:25,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 409 to 306. [2022-02-24 03:54:25,289 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 306 states, 296 states have (on average 1.1891891891891893) internal successors, (352), 297 states have internal predecessors, (352), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:54:25,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 306 states to 306 states and 363 transitions. [2022-02-24 03:54:25,290 INFO L78 Accepts]: Start accepts. Automaton has 306 states and 363 transitions. Word has length 64 [2022-02-24 03:54:25,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:54:25,290 INFO L470 AbstractCegarLoop]: Abstraction has 306 states and 363 transitions. [2022-02-24 03:54:25,290 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 2.32) internal successors, (58), 24 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:54:25,290 INFO L276 IsEmpty]: Start isEmpty. Operand 306 states and 363 transitions. [2022-02-24 03:54:25,298 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-02-24 03:54:25,298 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:54:25,298 INFO L514 BasicCegarLoop]: trace histogram [14, 14, 9, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:54:25,298 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable114 [2022-02-24 03:54:25,298 INFO L402 AbstractCegarLoop]: === Iteration 116 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:54:25,298 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:54:25,298 INFO L85 PathProgramCache]: Analyzing trace with hash -759821508, now seen corresponding path program 83 times [2022-02-24 03:54:25,298 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:54:25,298 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1586357775] [2022-02-24 03:54:25,299 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:54:25,299 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:54:25,458 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:54:25,591 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:54:25,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:54:25,675 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:54:25,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:54:25,678 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:54:25,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:54:25,680 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 03:54:26,490 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:54:26,491 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1586357775] [2022-02-24 03:54:26,491 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1586357775] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:54:26,491 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:54:26,491 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2022-02-24 03:54:26,491 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [551856959] [2022-02-24 03:54:26,491 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:54:26,491 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-02-24 03:54:26,491 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:54:26,491 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-02-24 03:54:26,492 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=649, Unknown=0, NotChecked=0, Total=756 [2022-02-24 03:54:26,492 INFO L87 Difference]: Start difference. First operand 306 states and 363 transitions. Second operand has 26 states, 26 states have (on average 2.230769230769231) internal successors, (58), 25 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:54:28,227 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:54:28,228 INFO L93 Difference]: Finished difference Result 697 states and 814 transitions. [2022-02-24 03:54:28,228 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-02-24 03:54:28,228 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.230769230769231) internal successors, (58), 25 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 64 [2022-02-24 03:54:28,228 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:54:28,229 INFO L225 Difference]: With dead ends: 697 [2022-02-24 03:54:28,229 INFO L226 Difference]: Without dead ends: 403 [2022-02-24 03:54:28,230 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 14 SyntacticMatches, 23 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 439 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=127, Invalid=743, Unknown=0, NotChecked=0, Total=870 [2022-02-24 03:54:28,230 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 60 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 1299 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 1313 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 1299 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-02-24 03:54:28,230 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [61 Valid, 51 Invalid, 1313 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 1299 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-02-24 03:54:28,230 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 403 states. [2022-02-24 03:54:28,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 403 to 306. [2022-02-24 03:54:28,856 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 306 states, 296 states have (on average 1.1891891891891893) internal successors, (352), 297 states have internal predecessors, (352), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:54:28,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 306 states to 306 states and 363 transitions. [2022-02-24 03:54:28,857 INFO L78 Accepts]: Start accepts. Automaton has 306 states and 363 transitions. Word has length 64 [2022-02-24 03:54:28,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:54:28,857 INFO L470 AbstractCegarLoop]: Abstraction has 306 states and 363 transitions. [2022-02-24 03:54:28,857 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 2.230769230769231) internal successors, (58), 25 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:54:28,857 INFO L276 IsEmpty]: Start isEmpty. Operand 306 states and 363 transitions. [2022-02-24 03:54:28,857 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-02-24 03:54:28,857 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:54:28,857 INFO L514 BasicCegarLoop]: trace histogram [14, 14, 8, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:54:28,857 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable115 [2022-02-24 03:54:28,857 INFO L402 AbstractCegarLoop]: === Iteration 117 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:54:28,857 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:54:28,858 INFO L85 PathProgramCache]: Analyzing trace with hash -1603827010, now seen corresponding path program 84 times [2022-02-24 03:54:28,858 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:54:28,858 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1111092552] [2022-02-24 03:54:28,858 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:54:28,858 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:54:28,978 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:54:29,096 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:54:29,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:54:29,173 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:54:29,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:54:29,176 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:54:29,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:54:29,177 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 03:54:29,954 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:54:29,954 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1111092552] [2022-02-24 03:54:29,954 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1111092552] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:54:29,954 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:54:29,954 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2022-02-24 03:54:29,955 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1625849705] [2022-02-24 03:54:29,955 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:54:29,955 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-02-24 03:54:29,955 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:54:29,955 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-02-24 03:54:29,955 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=115, Invalid=697, Unknown=0, NotChecked=0, Total=812 [2022-02-24 03:54:29,955 INFO L87 Difference]: Start difference. First operand 306 states and 363 transitions. Second operand has 27 states, 27 states have (on average 2.1481481481481484) internal successors, (58), 26 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:54:31,771 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:54:31,771 INFO L93 Difference]: Finished difference Result 691 states and 808 transitions. [2022-02-24 03:54:31,773 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-02-24 03:54:31,773 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 2.1481481481481484) internal successors, (58), 26 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 64 [2022-02-24 03:54:31,773 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:54:31,774 INFO L225 Difference]: With dead ends: 691 [2022-02-24 03:54:31,774 INFO L226 Difference]: Without dead ends: 397 [2022-02-24 03:54:31,774 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 14 SyntacticMatches, 22 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 472 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=137, Invalid=793, Unknown=0, NotChecked=0, Total=930 [2022-02-24 03:54:31,774 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 64 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 1606 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 1621 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 1606 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-02-24 03:54:31,774 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [65 Valid, 49 Invalid, 1621 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 1606 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-02-24 03:54:31,775 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 397 states. [2022-02-24 03:54:32,404 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 397 to 306. [2022-02-24 03:54:32,404 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 306 states, 296 states have (on average 1.1891891891891893) internal successors, (352), 297 states have internal predecessors, (352), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:54:32,404 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 306 states to 306 states and 363 transitions. [2022-02-24 03:54:32,404 INFO L78 Accepts]: Start accepts. Automaton has 306 states and 363 transitions. Word has length 64 [2022-02-24 03:54:32,405 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:54:32,405 INFO L470 AbstractCegarLoop]: Abstraction has 306 states and 363 transitions. [2022-02-24 03:54:32,405 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 2.1481481481481484) internal successors, (58), 26 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:54:32,405 INFO L276 IsEmpty]: Start isEmpty. Operand 306 states and 363 transitions. [2022-02-24 03:54:32,405 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-02-24 03:54:32,405 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:54:32,405 INFO L514 BasicCegarLoop]: trace histogram [14, 14, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:54:32,405 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable116 [2022-02-24 03:54:32,405 INFO L402 AbstractCegarLoop]: === Iteration 118 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:54:32,405 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:54:32,405 INFO L85 PathProgramCache]: Analyzing trace with hash -1329067396, now seen corresponding path program 85 times [2022-02-24 03:54:32,405 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:54:32,405 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1272277182] [2022-02-24 03:54:32,405 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:54:32,406 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:54:32,530 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:54:32,651 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:54:32,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:54:32,735 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:54:32,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:54:32,738 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:54:32,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:54:32,739 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 03:54:33,424 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:54:33,425 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1272277182] [2022-02-24 03:54:33,425 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1272277182] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:54:33,425 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:54:33,425 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [] total 28 [2022-02-24 03:54:33,425 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1931334974] [2022-02-24 03:54:33,425 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:54:33,425 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-02-24 03:54:33,425 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:54:33,425 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-02-24 03:54:33,425 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=747, Unknown=0, NotChecked=0, Total=870 [2022-02-24 03:54:33,425 INFO L87 Difference]: Start difference. First operand 306 states and 363 transitions. Second operand has 28 states, 28 states have (on average 2.0714285714285716) internal successors, (58), 27 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:54:35,219 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:54:35,219 INFO L93 Difference]: Finished difference Result 685 states and 802 transitions. [2022-02-24 03:54:35,219 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-02-24 03:54:35,220 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 2.0714285714285716) internal successors, (58), 27 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 64 [2022-02-24 03:54:35,220 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:54:35,220 INFO L225 Difference]: With dead ends: 685 [2022-02-24 03:54:35,220 INFO L226 Difference]: Without dead ends: 391 [2022-02-24 03:54:35,221 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 14 SyntacticMatches, 21 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 496 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=147, Invalid=845, Unknown=0, NotChecked=0, Total=992 [2022-02-24 03:54:35,221 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 57 mSDsluCounter, 43 mSDsCounter, 0 mSdLazyCounter, 1701 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 64 SdHoareTripleChecker+Invalid, 1717 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 1701 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-02-24 03:54:35,221 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [58 Valid, 64 Invalid, 1717 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 1701 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-02-24 03:54:35,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 391 states. [2022-02-24 03:54:35,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 391 to 306. [2022-02-24 03:54:35,852 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 306 states, 296 states have (on average 1.1891891891891893) internal successors, (352), 297 states have internal predecessors, (352), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:54:35,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 306 states to 306 states and 363 transitions. [2022-02-24 03:54:35,853 INFO L78 Accepts]: Start accepts. Automaton has 306 states and 363 transitions. Word has length 64 [2022-02-24 03:54:35,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:54:35,853 INFO L470 AbstractCegarLoop]: Abstraction has 306 states and 363 transitions. [2022-02-24 03:54:35,853 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 2.0714285714285716) internal successors, (58), 27 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:54:35,853 INFO L276 IsEmpty]: Start isEmpty. Operand 306 states and 363 transitions. [2022-02-24 03:54:35,853 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-02-24 03:54:35,853 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:54:35,853 INFO L514 BasicCegarLoop]: trace histogram [14, 14, 8, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:54:35,853 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable117 [2022-02-24 03:54:35,854 INFO L402 AbstractCegarLoop]: === Iteration 119 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:54:35,854 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:54:35,854 INFO L85 PathProgramCache]: Analyzing trace with hash 57135998, now seen corresponding path program 86 times [2022-02-24 03:54:35,854 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:54:35,854 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1672440106] [2022-02-24 03:54:35,854 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:54:35,854 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:54:35,981 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:54:36,104 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:54:36,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:54:36,187 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:54:36,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:54:36,190 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:54:36,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:54:36,196 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 03:54:36,957 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:54:36,957 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1672440106] [2022-02-24 03:54:36,958 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1672440106] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:54:36,958 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:54:36,958 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2022-02-24 03:54:36,958 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1762740724] [2022-02-24 03:54:36,958 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:54:36,958 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-02-24 03:54:36,958 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:54:36,958 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-02-24 03:54:36,958 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=799, Unknown=0, NotChecked=0, Total=930 [2022-02-24 03:54:36,958 INFO L87 Difference]: Start difference. First operand 306 states and 363 transitions. Second operand has 29 states, 29 states have (on average 2.0) internal successors, (58), 28 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:54:38,860 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:54:38,860 INFO L93 Difference]: Finished difference Result 679 states and 796 transitions. [2022-02-24 03:54:38,862 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-02-24 03:54:38,862 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 2.0) internal successors, (58), 28 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 64 [2022-02-24 03:54:38,862 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:54:38,862 INFO L225 Difference]: With dead ends: 679 [2022-02-24 03:54:38,863 INFO L226 Difference]: Without dead ends: 385 [2022-02-24 03:54:38,864 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 14 SyntacticMatches, 20 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 511 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=157, Invalid=899, Unknown=0, NotChecked=0, Total=1056 [2022-02-24 03:54:38,864 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 72 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 1858 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 1875 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 1858 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-02-24 03:54:38,864 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [73 Valid, 48 Invalid, 1875 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 1858 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-02-24 03:54:38,864 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 385 states. [2022-02-24 03:54:39,499 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 385 to 306. [2022-02-24 03:54:39,500 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 306 states, 296 states have (on average 1.1891891891891893) internal successors, (352), 297 states have internal predecessors, (352), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:54:39,500 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 306 states to 306 states and 363 transitions. [2022-02-24 03:54:39,500 INFO L78 Accepts]: Start accepts. Automaton has 306 states and 363 transitions. Word has length 64 [2022-02-24 03:54:39,500 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:54:39,500 INFO L470 AbstractCegarLoop]: Abstraction has 306 states and 363 transitions. [2022-02-24 03:54:39,501 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 2.0) internal successors, (58), 28 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:54:39,501 INFO L276 IsEmpty]: Start isEmpty. Operand 306 states and 363 transitions. [2022-02-24 03:54:39,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-02-24 03:54:39,501 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:54:39,501 INFO L514 BasicCegarLoop]: trace histogram [14, 14, 9, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:54:39,501 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable118 [2022-02-24 03:54:39,501 INFO L402 AbstractCegarLoop]: === Iteration 120 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:54:39,501 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:54:39,501 INFO L85 PathProgramCache]: Analyzing trace with hash 119175612, now seen corresponding path program 87 times [2022-02-24 03:54:39,501 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:54:39,501 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [488417005] [2022-02-24 03:54:39,501 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:54:39,502 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:54:39,628 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:54:39,747 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:54:39,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:54:39,844 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:54:39,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:54:39,847 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:54:39,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:54:39,848 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 03:54:40,602 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:54:40,602 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [488417005] [2022-02-24 03:54:40,602 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [488417005] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:54:40,602 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:54:40,602 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2022-02-24 03:54:40,602 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [843095205] [2022-02-24 03:54:40,602 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:54:40,602 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-02-24 03:54:40,602 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:54:40,602 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-02-24 03:54:40,602 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=139, Invalid=853, Unknown=0, NotChecked=0, Total=992 [2022-02-24 03:54:40,603 INFO L87 Difference]: Start difference. First operand 306 states and 363 transitions. Second operand has 30 states, 30 states have (on average 1.9333333333333333) internal successors, (58), 29 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:54:42,443 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:54:42,444 INFO L93 Difference]: Finished difference Result 673 states and 790 transitions. [2022-02-24 03:54:42,444 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-02-24 03:54:42,444 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 1.9333333333333333) internal successors, (58), 29 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 64 [2022-02-24 03:54:42,444 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:54:42,445 INFO L225 Difference]: With dead ends: 673 [2022-02-24 03:54:42,445 INFO L226 Difference]: Without dead ends: 379 [2022-02-24 03:54:42,445 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 14 SyntacticMatches, 19 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 517 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=167, Invalid=955, Unknown=0, NotChecked=0, Total=1122 [2022-02-24 03:54:42,445 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 64 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 1781 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 1799 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 1781 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-02-24 03:54:42,445 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [65 Valid, 61 Invalid, 1799 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 1781 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-02-24 03:54:42,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 379 states. [2022-02-24 03:54:43,099 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 379 to 306. [2022-02-24 03:54:43,099 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 306 states, 296 states have (on average 1.1891891891891893) internal successors, (352), 297 states have internal predecessors, (352), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:54:43,100 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 306 states to 306 states and 363 transitions. [2022-02-24 03:54:43,100 INFO L78 Accepts]: Start accepts. Automaton has 306 states and 363 transitions. Word has length 64 [2022-02-24 03:54:43,100 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:54:43,100 INFO L470 AbstractCegarLoop]: Abstraction has 306 states and 363 transitions. [2022-02-24 03:54:43,100 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 1.9333333333333333) internal successors, (58), 29 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:54:43,100 INFO L276 IsEmpty]: Start isEmpty. Operand 306 states and 363 transitions. [2022-02-24 03:54:43,100 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-02-24 03:54:43,100 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:54:43,100 INFO L514 BasicCegarLoop]: trace histogram [14, 14, 10, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:54:43,100 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable119 [2022-02-24 03:54:43,100 INFO L402 AbstractCegarLoop]: === Iteration 121 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:54:43,101 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:54:43,101 INFO L85 PathProgramCache]: Analyzing trace with hash -1686262722, now seen corresponding path program 88 times [2022-02-24 03:54:43,101 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:54:43,101 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1821619133] [2022-02-24 03:54:43,101 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:54:43,101 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:54:43,222 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:54:43,344 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:54:43,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:54:43,427 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:54:43,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:54:43,429 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:54:43,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:54:43,431 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 03:54:44,260 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:54:44,261 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1821619133] [2022-02-24 03:54:44,261 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1821619133] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:54:44,261 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:54:44,261 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2022-02-24 03:54:44,261 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1779611515] [2022-02-24 03:54:44,261 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:54:44,261 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-02-24 03:54:44,261 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:54:44,261 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-02-24 03:54:44,261 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=147, Invalid=909, Unknown=0, NotChecked=0, Total=1056 [2022-02-24 03:54:44,261 INFO L87 Difference]: Start difference. First operand 306 states and 363 transitions. Second operand has 31 states, 31 states have (on average 1.8709677419354838) internal successors, (58), 30 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:54:45,882 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:54:45,882 INFO L93 Difference]: Finished difference Result 667 states and 784 transitions. [2022-02-24 03:54:45,882 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2022-02-24 03:54:45,882 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.8709677419354838) internal successors, (58), 30 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 64 [2022-02-24 03:54:45,882 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:54:45,883 INFO L225 Difference]: With dead ends: 667 [2022-02-24 03:54:45,883 INFO L226 Difference]: Without dead ends: 373 [2022-02-24 03:54:45,883 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 14 SyntacticMatches, 18 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 514 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=177, Invalid=1013, Unknown=0, NotChecked=0, Total=1190 [2022-02-24 03:54:45,883 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 86 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 1297 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 1316 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 1297 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-02-24 03:54:45,884 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [87 Valid, 42 Invalid, 1316 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 1297 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-02-24 03:54:45,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 373 states. [2022-02-24 03:54:46,513 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 373 to 306. [2022-02-24 03:54:46,513 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 306 states, 296 states have (on average 1.1891891891891893) internal successors, (352), 297 states have internal predecessors, (352), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:54:46,513 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 306 states to 306 states and 363 transitions. [2022-02-24 03:54:46,513 INFO L78 Accepts]: Start accepts. Automaton has 306 states and 363 transitions. Word has length 64 [2022-02-24 03:54:46,514 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:54:46,514 INFO L470 AbstractCegarLoop]: Abstraction has 306 states and 363 transitions. [2022-02-24 03:54:46,514 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 1.8709677419354838) internal successors, (58), 30 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:54:46,514 INFO L276 IsEmpty]: Start isEmpty. Operand 306 states and 363 transitions. [2022-02-24 03:54:46,514 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-02-24 03:54:46,514 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:54:46,514 INFO L514 BasicCegarLoop]: trace histogram [14, 14, 11, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:54:46,514 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable120 [2022-02-24 03:54:46,514 INFO L402 AbstractCegarLoop]: === Iteration 122 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:54:46,514 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:54:46,514 INFO L85 PathProgramCache]: Analyzing trace with hash 1791056124, now seen corresponding path program 89 times [2022-02-24 03:54:46,514 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:54:46,514 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [108348039] [2022-02-24 03:54:46,515 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:54:46,515 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:54:46,638 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:54:46,760 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:54:46,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:54:46,847 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:54:46,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:54:46,849 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:54:46,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:54:46,851 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 03:54:47,647 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:54:47,648 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [108348039] [2022-02-24 03:54:47,648 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [108348039] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:54:47,648 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:54:47,648 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2022-02-24 03:54:47,648 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [27373878] [2022-02-24 03:54:47,648 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:54:47,648 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-02-24 03:54:47,648 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:54:47,648 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-02-24 03:54:47,648 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=967, Unknown=0, NotChecked=0, Total=1122 [2022-02-24 03:54:47,649 INFO L87 Difference]: Start difference. First operand 306 states and 363 transitions. Second operand has 32 states, 32 states have (on average 1.8125) internal successors, (58), 31 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:54:49,402 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:54:49,403 INFO L93 Difference]: Finished difference Result 661 states and 778 transitions. [2022-02-24 03:54:49,403 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-02-24 03:54:49,403 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.8125) internal successors, (58), 31 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 64 [2022-02-24 03:54:49,403 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:54:49,404 INFO L225 Difference]: With dead ends: 661 [2022-02-24 03:54:49,404 INFO L226 Difference]: Without dead ends: 367 [2022-02-24 03:54:49,404 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 14 SyntacticMatches, 17 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 502 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=187, Invalid=1073, Unknown=0, NotChecked=0, Total=1260 [2022-02-24 03:54:49,404 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 76 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 1804 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 77 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 1824 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 1804 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-02-24 03:54:49,404 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [77 Valid, 61 Invalid, 1824 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 1804 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-02-24 03:54:49,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 367 states. [2022-02-24 03:54:50,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 367 to 306. [2022-02-24 03:54:50,032 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 306 states, 296 states have (on average 1.1891891891891893) internal successors, (352), 297 states have internal predecessors, (352), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:54:50,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 306 states to 306 states and 363 transitions. [2022-02-24 03:54:50,033 INFO L78 Accepts]: Start accepts. Automaton has 306 states and 363 transitions. Word has length 64 [2022-02-24 03:54:50,033 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:54:50,033 INFO L470 AbstractCegarLoop]: Abstraction has 306 states and 363 transitions. [2022-02-24 03:54:50,033 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 1.8125) internal successors, (58), 31 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:54:50,033 INFO L276 IsEmpty]: Start isEmpty. Operand 306 states and 363 transitions. [2022-02-24 03:54:50,033 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-02-24 03:54:50,033 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:54:50,033 INFO L514 BasicCegarLoop]: trace histogram [14, 14, 12, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:54:50,034 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable121 [2022-02-24 03:54:50,034 INFO L402 AbstractCegarLoop]: === Iteration 123 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:54:50,034 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:54:50,034 INFO L85 PathProgramCache]: Analyzing trace with hash 202708222, now seen corresponding path program 90 times [2022-02-24 03:54:50,034 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:54:50,034 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2076516930] [2022-02-24 03:54:50,034 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:54:50,034 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:54:50,155 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:54:50,276 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:54:50,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:54:50,367 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:54:50,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:54:50,370 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:54:50,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:54:50,372 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 03:54:51,203 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:54:51,203 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2076516930] [2022-02-24 03:54:51,203 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [2076516930] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:54:51,203 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:54:51,203 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2022-02-24 03:54:51,203 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1671098471] [2022-02-24 03:54:51,203 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:54:51,204 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-02-24 03:54:51,204 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:54:51,204 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-02-24 03:54:51,204 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=1027, Unknown=0, NotChecked=0, Total=1190 [2022-02-24 03:54:51,204 INFO L87 Difference]: Start difference. First operand 306 states and 363 transitions. Second operand has 33 states, 33 states have (on average 1.7575757575757576) internal successors, (58), 32 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:54:52,915 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:54:52,915 INFO L93 Difference]: Finished difference Result 655 states and 772 transitions. [2022-02-24 03:54:52,916 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-02-24 03:54:52,916 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.7575757575757576) internal successors, (58), 32 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 64 [2022-02-24 03:54:52,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:54:52,916 INFO L225 Difference]: With dead ends: 655 [2022-02-24 03:54:52,916 INFO L226 Difference]: Without dead ends: 361 [2022-02-24 03:54:52,917 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 14 SyntacticMatches, 16 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 481 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=197, Invalid=1135, Unknown=0, NotChecked=0, Total=1332 [2022-02-24 03:54:52,917 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 95 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 1432 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 96 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 1453 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 1432 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-02-24 03:54:52,917 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [96 Valid, 43 Invalid, 1453 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 1432 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-02-24 03:54:52,917 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 361 states. [2022-02-24 03:54:53,549 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 361 to 306. [2022-02-24 03:54:53,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 306 states, 296 states have (on average 1.1891891891891893) internal successors, (352), 297 states have internal predecessors, (352), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:54:53,550 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 306 states to 306 states and 363 transitions. [2022-02-24 03:54:53,550 INFO L78 Accepts]: Start accepts. Automaton has 306 states and 363 transitions. Word has length 64 [2022-02-24 03:54:53,550 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:54:53,550 INFO L470 AbstractCegarLoop]: Abstraction has 306 states and 363 transitions. [2022-02-24 03:54:53,550 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 1.7575757575757576) internal successors, (58), 32 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:54:53,550 INFO L276 IsEmpty]: Start isEmpty. Operand 306 states and 363 transitions. [2022-02-24 03:54:53,550 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-02-24 03:54:53,550 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:54:53,551 INFO L514 BasicCegarLoop]: trace histogram [14, 14, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:54:53,551 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable122 [2022-02-24 03:54:53,551 INFO L402 AbstractCegarLoop]: === Iteration 124 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:54:53,551 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:54:53,551 INFO L85 PathProgramCache]: Analyzing trace with hash -808409028, now seen corresponding path program 91 times [2022-02-24 03:54:53,551 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:54:53,551 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [756607167] [2022-02-24 03:54:53,551 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:54:53,551 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:54:53,593 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:54:53,716 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:54:53,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:54:53,803 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:54:53,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:54:53,805 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:54:53,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:54:53,807 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 03:54:54,642 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:54:54,642 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [756607167] [2022-02-24 03:54:54,642 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [756607167] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:54:54,642 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:54:54,642 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [34] imperfect sequences [] total 34 [2022-02-24 03:54:54,642 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [208293014] [2022-02-24 03:54:54,642 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:54:54,642 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2022-02-24 03:54:54,643 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:54:54,643 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2022-02-24 03:54:54,643 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=1089, Unknown=0, NotChecked=0, Total=1260 [2022-02-24 03:54:54,643 INFO L87 Difference]: Start difference. First operand 306 states and 363 transitions. Second operand has 34 states, 34 states have (on average 1.7058823529411764) internal successors, (58), 33 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:54:56,579 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:54:56,579 INFO L93 Difference]: Finished difference Result 655 states and 775 transitions. [2022-02-24 03:54:56,581 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-02-24 03:54:56,581 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 1.7058823529411764) internal successors, (58), 33 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 64 [2022-02-24 03:54:56,581 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:54:56,582 INFO L225 Difference]: With dead ends: 655 [2022-02-24 03:54:56,582 INFO L226 Difference]: Without dead ends: 361 [2022-02-24 03:54:56,582 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 14 SyntacticMatches, 15 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 451 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=207, Invalid=1199, Unknown=0, NotChecked=0, Total=1406 [2022-02-24 03:54:56,582 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 81 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 1945 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 82 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 1967 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 1945 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-02-24 03:54:56,582 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [82 Valid, 63 Invalid, 1967 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 1945 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-02-24 03:54:56,583 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 361 states. [2022-02-24 03:54:57,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 361 to 309. [2022-02-24 03:54:57,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 309 states, 299 states have (on average 1.1973244147157192) internal successors, (358), 300 states have internal predecessors, (358), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:54:57,231 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 309 states to 309 states and 369 transitions. [2022-02-24 03:54:57,231 INFO L78 Accepts]: Start accepts. Automaton has 309 states and 369 transitions. Word has length 64 [2022-02-24 03:54:57,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:54:57,231 INFO L470 AbstractCegarLoop]: Abstraction has 309 states and 369 transitions. [2022-02-24 03:54:57,231 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 1.7058823529411764) internal successors, (58), 33 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:54:57,231 INFO L276 IsEmpty]: Start isEmpty. Operand 309 states and 369 transitions. [2022-02-24 03:54:57,231 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-02-24 03:54:57,231 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:54:57,231 INFO L514 BasicCegarLoop]: trace histogram [14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:54:57,231 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable123 [2022-02-24 03:54:57,232 INFO L402 AbstractCegarLoop]: === Iteration 125 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:54:57,232 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:54:57,232 INFO L85 PathProgramCache]: Analyzing trace with hash -973949378, now seen corresponding path program 14 times [2022-02-24 03:54:57,232 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:54:57,232 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1771570366] [2022-02-24 03:54:57,232 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:54:57,232 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:54:57,275 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:54:57,314 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:54:57,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:54:57,432 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:54:57,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:54:57,435 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:54:57,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:54:57,436 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 03:54:58,532 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:54:58,532 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1771570366] [2022-02-24 03:54:58,532 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1771570366] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:54:58,532 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:54:58,532 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [38] imperfect sequences [] total 38 [2022-02-24 03:54:58,532 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1585931449] [2022-02-24 03:54:58,532 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:54:58,532 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-02-24 03:54:58,532 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:54:58,532 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-02-24 03:54:58,533 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=179, Invalid=1303, Unknown=0, NotChecked=0, Total=1482 [2022-02-24 03:54:58,533 INFO L87 Difference]: Start difference. First operand 309 states and 369 transitions. Second operand has 38 states, 38 states have (on average 1.5263157894736843) internal successors, (58), 36 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:55:00,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:55:00,634 INFO L93 Difference]: Finished difference Result 715 states and 855 transitions. [2022-02-24 03:55:00,634 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-02-24 03:55:00,635 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.5263157894736843) internal successors, (58), 36 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 64 [2022-02-24 03:55:00,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:55:00,635 INFO L225 Difference]: With dead ends: 715 [2022-02-24 03:55:00,635 INFO L226 Difference]: Without dead ends: 418 [2022-02-24 03:55:00,636 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 7 SyntacticMatches, 14 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 455 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=189, Invalid=1451, Unknown=0, NotChecked=0, Total=1640 [2022-02-24 03:55:00,636 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 84 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 2339 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 85 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 2348 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 2339 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-02-24 03:55:00,636 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [85 Valid, 61 Invalid, 2348 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 2339 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-02-24 03:55:00,636 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 418 states. [2022-02-24 03:55:01,294 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 418 to 353. [2022-02-24 03:55:01,295 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 353 states, 343 states have (on average 1.2128279883381925) internal successors, (416), 343 states have internal predecessors, (416), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:55:01,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 353 states to 353 states and 427 transitions. [2022-02-24 03:55:01,295 INFO L78 Accepts]: Start accepts. Automaton has 353 states and 427 transitions. Word has length 64 [2022-02-24 03:55:01,295 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:55:01,296 INFO L470 AbstractCegarLoop]: Abstraction has 353 states and 427 transitions. [2022-02-24 03:55:01,296 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 1.5263157894736843) internal successors, (58), 36 states have internal predecessors, (58), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:55:01,296 INFO L276 IsEmpty]: Start isEmpty. Operand 353 states and 427 transitions. [2022-02-24 03:55:01,296 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-02-24 03:55:01,296 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:55:01,296 INFO L514 BasicCegarLoop]: trace histogram [15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:55:01,296 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable124 [2022-02-24 03:55:01,297 INFO L402 AbstractCegarLoop]: === Iteration 126 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:55:01,297 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:55:01,297 INFO L85 PathProgramCache]: Analyzing trace with hash 1434289085, now seen corresponding path program 15 times [2022-02-24 03:55:01,297 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:55:01,297 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1834025969] [2022-02-24 03:55:01,297 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:55:01,298 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:55:01,384 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:55:01,467 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:55:01,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:55:01,516 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:55:01,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:55:01,521 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:55:01,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:55:01,524 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 03:55:02,204 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:55:02,205 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1834025969] [2022-02-24 03:55:02,205 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1834025969] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:55:02,205 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:55:02,205 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [22] imperfect sequences [] total 22 [2022-02-24 03:55:02,205 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1653788656] [2022-02-24 03:55:02,205 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:55:02,205 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-02-24 03:55:02,205 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:55:02,205 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-02-24 03:55:02,205 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=427, Unknown=0, NotChecked=0, Total=506 [2022-02-24 03:55:02,205 INFO L87 Difference]: Start difference. First operand 353 states and 427 transitions. Second operand has 22 states, 22 states have (on average 2.772727272727273) internal successors, (61), 21 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:55:04,088 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:55:04,089 INFO L93 Difference]: Finished difference Result 779 states and 916 transitions. [2022-02-24 03:55:04,089 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-02-24 03:55:04,089 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.772727272727273) internal successors, (61), 21 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 67 [2022-02-24 03:55:04,089 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:55:04,090 INFO L225 Difference]: With dead ends: 779 [2022-02-24 03:55:04,090 INFO L226 Difference]: Without dead ends: 482 [2022-02-24 03:55:04,090 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 15 SyntacticMatches, 30 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 111 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=83, Invalid=469, Unknown=0, NotChecked=0, Total=552 [2022-02-24 03:55:04,090 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 39 mSDsluCounter, 31 mSDsCounter, 0 mSdLazyCounter, 1417 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 1427 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1417 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-02-24 03:55:04,090 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 52 Invalid, 1427 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 1417 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-02-24 03:55:04,091 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 482 states. [2022-02-24 03:55:04,844 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 482 to 362. [2022-02-24 03:55:04,845 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 362 states, 352 states have (on average 1.2073863636363635) internal successors, (425), 352 states have internal predecessors, (425), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:55:04,845 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 362 states to 362 states and 436 transitions. [2022-02-24 03:55:04,845 INFO L78 Accepts]: Start accepts. Automaton has 362 states and 436 transitions. Word has length 67 [2022-02-24 03:55:04,845 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:55:04,846 INFO L470 AbstractCegarLoop]: Abstraction has 362 states and 436 transitions. [2022-02-24 03:55:04,846 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 2.772727272727273) internal successors, (61), 21 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:55:04,846 INFO L276 IsEmpty]: Start isEmpty. Operand 362 states and 436 transitions. [2022-02-24 03:55:04,846 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-02-24 03:55:04,846 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:55:04,846 INFO L514 BasicCegarLoop]: trace histogram [15, 15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:55:04,846 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable125 [2022-02-24 03:55:04,846 INFO L402 AbstractCegarLoop]: === Iteration 127 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:55:04,846 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:55:04,846 INFO L85 PathProgramCache]: Analyzing trace with hash 1878189759, now seen corresponding path program 92 times [2022-02-24 03:55:04,846 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:55:04,847 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1476988841] [2022-02-24 03:55:04,847 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:55:04,847 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:55:04,976 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:55:05,106 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:55:05,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:55:05,194 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:55:05,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:55:05,197 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:55:05,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:55:05,199 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 03:55:05,984 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:55:05,984 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1476988841] [2022-02-24 03:55:05,984 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1476988841] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:55:05,984 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:55:05,984 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2022-02-24 03:55:05,984 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1653267194] [2022-02-24 03:55:05,984 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:55:05,985 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-02-24 03:55:05,985 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:55:05,985 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-02-24 03:55:05,985 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=522, Unknown=0, NotChecked=0, Total=600 [2022-02-24 03:55:05,985 INFO L87 Difference]: Start difference. First operand 362 states and 436 transitions. Second operand has 23 states, 23 states have (on average 2.652173913043478) internal successors, (61), 22 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:55:08,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:55:08,096 INFO L93 Difference]: Finished difference Result 797 states and 934 transitions. [2022-02-24 03:55:08,096 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-02-24 03:55:08,096 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.652173913043478) internal successors, (61), 22 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 67 [2022-02-24 03:55:08,096 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:55:08,097 INFO L225 Difference]: With dead ends: 797 [2022-02-24 03:55:08,097 INFO L226 Difference]: Without dead ends: 491 [2022-02-24 03:55:08,097 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 14 SyntacticMatches, 29 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 232 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=90, Invalid=612, Unknown=0, NotChecked=0, Total=702 [2022-02-24 03:55:08,097 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 44 mSDsluCounter, 31 mSDsCounter, 0 mSdLazyCounter, 1384 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 1394 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1384 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-02-24 03:55:08,097 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [45 Valid, 52 Invalid, 1394 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 1384 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-02-24 03:55:08,098 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 491 states. [2022-02-24 03:55:08,877 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 491 to 362. [2022-02-24 03:55:08,877 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 362 states, 352 states have (on average 1.2073863636363635) internal successors, (425), 352 states have internal predecessors, (425), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:55:08,878 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 362 states to 362 states and 436 transitions. [2022-02-24 03:55:08,878 INFO L78 Accepts]: Start accepts. Automaton has 362 states and 436 transitions. Word has length 67 [2022-02-24 03:55:08,878 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:55:08,878 INFO L470 AbstractCegarLoop]: Abstraction has 362 states and 436 transitions. [2022-02-24 03:55:08,878 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 2.652173913043478) internal successors, (61), 22 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:55:08,878 INFO L276 IsEmpty]: Start isEmpty. Operand 362 states and 436 transitions. [2022-02-24 03:55:08,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-02-24 03:55:08,878 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:55:08,878 INFO L514 BasicCegarLoop]: trace histogram [15, 15, 13, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:55:08,879 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable126 [2022-02-24 03:55:08,879 INFO L402 AbstractCegarLoop]: === Iteration 128 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:55:08,879 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:55:08,879 INFO L85 PathProgramCache]: Analyzing trace with hash 1397109501, now seen corresponding path program 93 times [2022-02-24 03:55:08,879 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:55:08,879 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [982920224] [2022-02-24 03:55:08,879 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:55:08,879 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:55:09,005 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:55:09,129 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:55:09,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:55:09,235 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:55:09,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:55:09,238 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:55:09,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:55:09,239 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 03:55:10,083 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:55:10,083 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [982920224] [2022-02-24 03:55:10,083 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [982920224] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:55:10,083 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:55:10,083 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2022-02-24 03:55:10,083 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [534467323] [2022-02-24 03:55:10,083 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:55:10,083 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-02-24 03:55:10,083 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:55:10,084 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-02-24 03:55:10,084 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=564, Unknown=0, NotChecked=0, Total=650 [2022-02-24 03:55:10,084 INFO L87 Difference]: Start difference. First operand 362 states and 436 transitions. Second operand has 24 states, 24 states have (on average 2.5416666666666665) internal successors, (61), 23 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:55:12,190 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:55:12,190 INFO L93 Difference]: Finished difference Result 791 states and 928 transitions. [2022-02-24 03:55:12,190 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-02-24 03:55:12,190 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.5416666666666665) internal successors, (61), 23 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 67 [2022-02-24 03:55:12,190 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:55:12,191 INFO L225 Difference]: With dead ends: 791 [2022-02-24 03:55:12,191 INFO L226 Difference]: Without dead ends: 485 [2022-02-24 03:55:12,191 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 14 SyntacticMatches, 28 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 307 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=100, Invalid=656, Unknown=0, NotChecked=0, Total=756 [2022-02-24 03:55:12,192 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 42 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 1419 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 1430 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 1419 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-02-24 03:55:12,192 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [43 Valid, 57 Invalid, 1430 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 1419 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-02-24 03:55:12,192 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 485 states. [2022-02-24 03:55:12,975 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 485 to 362. [2022-02-24 03:55:12,976 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 362 states, 352 states have (on average 1.2073863636363635) internal successors, (425), 352 states have internal predecessors, (425), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:55:12,976 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 362 states to 362 states and 436 transitions. [2022-02-24 03:55:12,976 INFO L78 Accepts]: Start accepts. Automaton has 362 states and 436 transitions. Word has length 67 [2022-02-24 03:55:12,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:55:12,976 INFO L470 AbstractCegarLoop]: Abstraction has 362 states and 436 transitions. [2022-02-24 03:55:12,976 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 2.5416666666666665) internal successors, (61), 23 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:55:12,977 INFO L276 IsEmpty]: Start isEmpty. Operand 362 states and 436 transitions. [2022-02-24 03:55:12,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-02-24 03:55:12,977 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:55:12,977 INFO L514 BasicCegarLoop]: trace histogram [15, 15, 12, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:55:12,977 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable127 [2022-02-24 03:55:12,977 INFO L402 AbstractCegarLoop]: === Iteration 129 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:55:12,977 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:55:12,977 INFO L85 PathProgramCache]: Analyzing trace with hash 1044021119, now seen corresponding path program 94 times [2022-02-24 03:55:12,977 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:55:12,977 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1937050449] [2022-02-24 03:55:12,977 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:55:12,978 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:55:13,104 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:55:13,226 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:55:13,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:55:13,314 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:55:13,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:55:13,320 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:55:13,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:55:13,322 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 03:55:14,090 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:55:14,091 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1937050449] [2022-02-24 03:55:14,091 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1937050449] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:55:14,091 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:55:14,091 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2022-02-24 03:55:14,091 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [121358290] [2022-02-24 03:55:14,091 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:55:14,091 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-02-24 03:55:14,091 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:55:14,091 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-02-24 03:55:14,091 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=609, Unknown=0, NotChecked=0, Total=702 [2022-02-24 03:55:14,092 INFO L87 Difference]: Start difference. First operand 362 states and 436 transitions. Second operand has 25 states, 25 states have (on average 2.44) internal successors, (61), 24 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:55:16,230 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:55:16,230 INFO L93 Difference]: Finished difference Result 785 states and 922 transitions. [2022-02-24 03:55:16,231 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-02-24 03:55:16,231 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.44) internal successors, (61), 24 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 67 [2022-02-24 03:55:16,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:55:16,232 INFO L225 Difference]: With dead ends: 785 [2022-02-24 03:55:16,232 INFO L226 Difference]: Without dead ends: 479 [2022-02-24 03:55:16,232 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 15 SyntacticMatches, 27 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 365 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=97, Invalid=659, Unknown=0, NotChecked=0, Total=756 [2022-02-24 03:55:16,232 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 49 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 1456 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 50 SdHoareTripleChecker+Invalid, 1466 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1456 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-02-24 03:55:16,233 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [50 Valid, 50 Invalid, 1466 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 1456 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-02-24 03:55:16,233 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 479 states. [2022-02-24 03:55:17,044 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 479 to 362. [2022-02-24 03:55:17,044 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 362 states, 352 states have (on average 1.2073863636363635) internal successors, (425), 352 states have internal predecessors, (425), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:55:17,045 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 362 states to 362 states and 436 transitions. [2022-02-24 03:55:17,045 INFO L78 Accepts]: Start accepts. Automaton has 362 states and 436 transitions. Word has length 67 [2022-02-24 03:55:17,045 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:55:17,045 INFO L470 AbstractCegarLoop]: Abstraction has 362 states and 436 transitions. [2022-02-24 03:55:17,045 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 2.44) internal successors, (61), 24 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:55:17,045 INFO L276 IsEmpty]: Start isEmpty. Operand 362 states and 436 transitions. [2022-02-24 03:55:17,045 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-02-24 03:55:17,045 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:55:17,045 INFO L514 BasicCegarLoop]: trace histogram [15, 15, 11, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:55:17,045 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable128 [2022-02-24 03:55:17,045 INFO L402 AbstractCegarLoop]: === Iteration 130 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:55:17,046 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:55:17,046 INFO L85 PathProgramCache]: Analyzing trace with hash -1005366723, now seen corresponding path program 95 times [2022-02-24 03:55:17,046 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:55:17,046 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [84020993] [2022-02-24 03:55:17,046 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:55:17,046 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:55:17,170 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:55:17,294 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:55:17,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:55:17,399 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:55:17,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:55:17,401 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:55:17,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:55:17,403 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 03:55:18,174 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:55:18,174 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [84020993] [2022-02-24 03:55:18,174 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [84020993] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:55:18,174 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:55:18,174 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2022-02-24 03:55:18,174 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [833446513] [2022-02-24 03:55:18,174 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:55:18,175 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-02-24 03:55:18,175 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:55:18,175 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-02-24 03:55:18,175 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=654, Unknown=0, NotChecked=0, Total=756 [2022-02-24 03:55:18,175 INFO L87 Difference]: Start difference. First operand 362 states and 436 transitions. Second operand has 26 states, 26 states have (on average 2.3461538461538463) internal successors, (61), 25 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:55:20,259 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:55:20,259 INFO L93 Difference]: Finished difference Result 779 states and 916 transitions. [2022-02-24 03:55:20,259 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-02-24 03:55:20,259 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.3461538461538463) internal successors, (61), 25 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 67 [2022-02-24 03:55:20,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:55:20,260 INFO L225 Difference]: With dead ends: 779 [2022-02-24 03:55:20,260 INFO L226 Difference]: Without dead ends: 473 [2022-02-24 03:55:20,260 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 14 SyntacticMatches, 26 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 430 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=120, Invalid=750, Unknown=0, NotChecked=0, Total=870 [2022-02-24 03:55:20,261 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 57 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 1368 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 1381 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 1368 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-02-24 03:55:20,261 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [58 Valid, 51 Invalid, 1381 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 1368 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-02-24 03:55:20,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 473 states. [2022-02-24 03:55:21,092 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 473 to 362. [2022-02-24 03:55:21,093 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 362 states, 352 states have (on average 1.2073863636363635) internal successors, (425), 352 states have internal predecessors, (425), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:55:21,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 362 states to 362 states and 436 transitions. [2022-02-24 03:55:21,093 INFO L78 Accepts]: Start accepts. Automaton has 362 states and 436 transitions. Word has length 67 [2022-02-24 03:55:21,093 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:55:21,093 INFO L470 AbstractCegarLoop]: Abstraction has 362 states and 436 transitions. [2022-02-24 03:55:21,093 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 2.3461538461538463) internal successors, (61), 25 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:55:21,093 INFO L276 IsEmpty]: Start isEmpty. Operand 362 states and 436 transitions. [2022-02-24 03:55:21,094 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-02-24 03:55:21,094 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:55:21,094 INFO L514 BasicCegarLoop]: trace histogram [15, 15, 10, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:55:21,094 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable129 [2022-02-24 03:55:21,094 INFO L402 AbstractCegarLoop]: === Iteration 131 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:55:21,094 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:55:21,094 INFO L85 PathProgramCache]: Analyzing trace with hash -581720001, now seen corresponding path program 96 times [2022-02-24 03:55:21,094 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:55:21,094 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1179373905] [2022-02-24 03:55:21,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:55:21,094 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:55:21,221 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:55:21,348 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:55:21,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:55:21,434 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:55:21,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:55:21,437 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:55:21,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:55:21,438 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 03:55:22,263 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:55:22,263 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1179373905] [2022-02-24 03:55:22,263 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1179373905] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:55:22,263 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:55:22,263 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2022-02-24 03:55:22,263 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [781026885] [2022-02-24 03:55:22,263 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:55:22,264 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-02-24 03:55:22,264 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:55:22,264 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-02-24 03:55:22,264 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=702, Unknown=0, NotChecked=0, Total=812 [2022-02-24 03:55:22,264 INFO L87 Difference]: Start difference. First operand 362 states and 436 transitions. Second operand has 27 states, 27 states have (on average 2.259259259259259) internal successors, (61), 26 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:55:24,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:55:24,561 INFO L93 Difference]: Finished difference Result 773 states and 910 transitions. [2022-02-24 03:55:24,561 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-02-24 03:55:24,561 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 2.259259259259259) internal successors, (61), 26 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 67 [2022-02-24 03:55:24,561 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:55:24,562 INFO L225 Difference]: With dead ends: 773 [2022-02-24 03:55:24,562 INFO L226 Difference]: Without dead ends: 467 [2022-02-24 03:55:24,562 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 14 SyntacticMatches, 25 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 478 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=130, Invalid=800, Unknown=0, NotChecked=0, Total=930 [2022-02-24 03:55:24,562 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 58 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 1688 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 50 SdHoareTripleChecker+Invalid, 1702 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 1688 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-02-24 03:55:24,563 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [59 Valid, 50 Invalid, 1702 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 1688 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-02-24 03:55:24,563 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 467 states. [2022-02-24 03:55:25,414 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 467 to 362. [2022-02-24 03:55:25,414 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 362 states, 352 states have (on average 1.2073863636363635) internal successors, (425), 352 states have internal predecessors, (425), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:55:25,414 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 362 states to 362 states and 436 transitions. [2022-02-24 03:55:25,414 INFO L78 Accepts]: Start accepts. Automaton has 362 states and 436 transitions. Word has length 67 [2022-02-24 03:55:25,415 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:55:25,415 INFO L470 AbstractCegarLoop]: Abstraction has 362 states and 436 transitions. [2022-02-24 03:55:25,415 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 2.259259259259259) internal successors, (61), 26 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:55:25,415 INFO L276 IsEmpty]: Start isEmpty. Operand 362 states and 436 transitions. [2022-02-24 03:55:25,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-02-24 03:55:25,415 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:55:25,415 INFO L514 BasicCegarLoop]: trace histogram [15, 15, 9, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:55:25,415 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable130 [2022-02-24 03:55:25,415 INFO L402 AbstractCegarLoop]: === Iteration 132 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:55:25,415 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:55:25,415 INFO L85 PathProgramCache]: Analyzing trace with hash -1611079299, now seen corresponding path program 97 times [2022-02-24 03:55:25,415 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:55:25,415 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1210893110] [2022-02-24 03:55:25,416 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:55:25,416 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:55:25,558 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:55:25,710 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:55:25,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:55:25,799 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:55:25,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:55:25,801 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:55:25,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:55:25,803 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 03:55:26,636 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:55:26,637 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1210893110] [2022-02-24 03:55:26,637 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1210893110] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:55:26,637 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:55:26,637 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [] total 28 [2022-02-24 03:55:26,637 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1264940123] [2022-02-24 03:55:26,637 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:55:26,637 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-02-24 03:55:26,637 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:55:26,637 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-02-24 03:55:26,637 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=752, Unknown=0, NotChecked=0, Total=870 [2022-02-24 03:55:26,638 INFO L87 Difference]: Start difference. First operand 362 states and 436 transitions. Second operand has 28 states, 28 states have (on average 2.1785714285714284) internal successors, (61), 27 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:55:28,972 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:55:28,972 INFO L93 Difference]: Finished difference Result 767 states and 904 transitions. [2022-02-24 03:55:28,972 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-02-24 03:55:28,972 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 2.1785714285714284) internal successors, (61), 27 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 67 [2022-02-24 03:55:28,972 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:55:28,973 INFO L225 Difference]: With dead ends: 767 [2022-02-24 03:55:28,973 INFO L226 Difference]: Without dead ends: 461 [2022-02-24 03:55:28,973 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 14 SyntacticMatches, 24 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 517 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=140, Invalid=852, Unknown=0, NotChecked=0, Total=992 [2022-02-24 03:55:28,974 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 66 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 1874 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 1889 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 1874 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-02-24 03:55:28,974 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [67 Valid, 57 Invalid, 1889 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 1874 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-02-24 03:55:28,974 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 461 states. [2022-02-24 03:55:29,811 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 461 to 362. [2022-02-24 03:55:29,811 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 362 states, 352 states have (on average 1.2073863636363635) internal successors, (425), 352 states have internal predecessors, (425), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:55:29,812 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 362 states to 362 states and 436 transitions. [2022-02-24 03:55:29,812 INFO L78 Accepts]: Start accepts. Automaton has 362 states and 436 transitions. Word has length 67 [2022-02-24 03:55:29,812 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:55:29,812 INFO L470 AbstractCegarLoop]: Abstraction has 362 states and 436 transitions. [2022-02-24 03:55:29,812 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 2.1785714285714284) internal successors, (61), 27 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:55:29,812 INFO L276 IsEmpty]: Start isEmpty. Operand 362 states and 436 transitions. [2022-02-24 03:55:29,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-02-24 03:55:29,812 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:55:29,812 INFO L514 BasicCegarLoop]: trace histogram [15, 15, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:55:29,812 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable131 [2022-02-24 03:55:29,812 INFO L402 AbstractCegarLoop]: === Iteration 133 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:55:29,812 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:55:29,813 INFO L85 PathProgramCache]: Analyzing trace with hash 1839882495, now seen corresponding path program 98 times [2022-02-24 03:55:29,813 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:55:29,813 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [610361715] [2022-02-24 03:55:29,813 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:55:29,813 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:55:29,938 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:55:30,064 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:55:30,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:55:30,172 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:55:30,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:55:30,175 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:55:30,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:55:30,177 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 03:55:30,952 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:55:30,952 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [610361715] [2022-02-24 03:55:30,952 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [610361715] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:55:30,952 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:55:30,952 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2022-02-24 03:55:30,952 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2145834386] [2022-02-24 03:55:30,953 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:55:30,953 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-02-24 03:55:30,953 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:55:30,953 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-02-24 03:55:30,953 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=804, Unknown=0, NotChecked=0, Total=930 [2022-02-24 03:55:30,953 INFO L87 Difference]: Start difference. First operand 362 states and 436 transitions. Second operand has 29 states, 29 states have (on average 2.103448275862069) internal successors, (61), 28 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:55:33,092 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:55:33,092 INFO L93 Difference]: Finished difference Result 761 states and 898 transitions. [2022-02-24 03:55:33,092 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-02-24 03:55:33,092 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 2.103448275862069) internal successors, (61), 28 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 67 [2022-02-24 03:55:33,092 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:55:33,093 INFO L225 Difference]: With dead ends: 761 [2022-02-24 03:55:33,093 INFO L226 Difference]: Without dead ends: 455 [2022-02-24 03:55:33,094 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 14 SyntacticMatches, 23 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 547 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=150, Invalid=906, Unknown=0, NotChecked=0, Total=1056 [2022-02-24 03:55:33,094 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 69 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 1493 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 54 SdHoareTripleChecker+Invalid, 1509 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 1493 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-02-24 03:55:33,094 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [70 Valid, 54 Invalid, 1509 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 1493 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-02-24 03:55:33,094 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 455 states. [2022-02-24 03:55:33,944 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 455 to 362. [2022-02-24 03:55:33,945 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 362 states, 352 states have (on average 1.2073863636363635) internal successors, (425), 352 states have internal predecessors, (425), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:55:33,945 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 362 states to 362 states and 436 transitions. [2022-02-24 03:55:33,945 INFO L78 Accepts]: Start accepts. Automaton has 362 states and 436 transitions. Word has length 67 [2022-02-24 03:55:33,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:55:33,945 INFO L470 AbstractCegarLoop]: Abstraction has 362 states and 436 transitions. [2022-02-24 03:55:33,945 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 2.103448275862069) internal successors, (61), 28 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:55:33,945 INFO L276 IsEmpty]: Start isEmpty. Operand 362 states and 436 transitions. [2022-02-24 03:55:33,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-02-24 03:55:33,946 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:55:33,946 INFO L514 BasicCegarLoop]: trace histogram [15, 15, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:55:33,946 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable132 [2022-02-24 03:55:33,946 INFO L402 AbstractCegarLoop]: === Iteration 134 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:55:33,946 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:55:33,946 INFO L85 PathProgramCache]: Analyzing trace with hash 2114642109, now seen corresponding path program 99 times [2022-02-24 03:55:33,946 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:55:33,946 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [830844119] [2022-02-24 03:55:33,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:55:33,946 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:55:34,075 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:55:34,201 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:55:34,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:55:34,294 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:55:34,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:55:34,304 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:55:34,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:55:34,306 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 03:55:35,306 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:55:35,306 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [830844119] [2022-02-24 03:55:35,306 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [830844119] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:55:35,306 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:55:35,306 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2022-02-24 03:55:35,306 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [82968958] [2022-02-24 03:55:35,306 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:55:35,306 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-02-24 03:55:35,306 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:55:35,307 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-02-24 03:55:35,307 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=858, Unknown=0, NotChecked=0, Total=992 [2022-02-24 03:55:35,307 INFO L87 Difference]: Start difference. First operand 362 states and 436 transitions. Second operand has 30 states, 30 states have (on average 2.033333333333333) internal successors, (61), 29 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:55:37,692 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:55:37,693 INFO L93 Difference]: Finished difference Result 755 states and 892 transitions. [2022-02-24 03:55:37,693 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-02-24 03:55:37,693 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 2.033333333333333) internal successors, (61), 29 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 67 [2022-02-24 03:55:37,693 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:55:37,693 INFO L225 Difference]: With dead ends: 755 [2022-02-24 03:55:37,694 INFO L226 Difference]: Without dead ends: 449 [2022-02-24 03:55:37,694 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 14 SyntacticMatches, 22 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 568 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=160, Invalid=962, Unknown=0, NotChecked=0, Total=1122 [2022-02-24 03:55:37,694 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 64 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 1895 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 60 SdHoareTripleChecker+Invalid, 1912 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 1895 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-02-24 03:55:37,694 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [65 Valid, 60 Invalid, 1912 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 1895 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-02-24 03:55:37,694 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 449 states. [2022-02-24 03:55:38,552 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 449 to 362. [2022-02-24 03:55:38,553 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 362 states, 352 states have (on average 1.2073863636363635) internal successors, (425), 352 states have internal predecessors, (425), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:55:38,553 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 362 states to 362 states and 436 transitions. [2022-02-24 03:55:38,553 INFO L78 Accepts]: Start accepts. Automaton has 362 states and 436 transitions. Word has length 67 [2022-02-24 03:55:38,553 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:55:38,553 INFO L470 AbstractCegarLoop]: Abstraction has 362 states and 436 transitions. [2022-02-24 03:55:38,554 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 2.033333333333333) internal successors, (61), 29 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:55:38,554 INFO L276 IsEmpty]: Start isEmpty. Operand 362 states and 436 transitions. [2022-02-24 03:55:38,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-02-24 03:55:38,554 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:55:38,554 INFO L514 BasicCegarLoop]: trace histogram [15, 15, 9, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:55:38,554 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable133 [2022-02-24 03:55:38,554 INFO L402 AbstractCegarLoop]: === Iteration 135 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:55:38,554 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:55:38,554 INFO L85 PathProgramCache]: Analyzing trace with hash -794121793, now seen corresponding path program 100 times [2022-02-24 03:55:38,554 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:55:38,554 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [145175185] [2022-02-24 03:55:38,554 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:55:38,555 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:55:38,681 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:55:38,805 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:55:38,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:55:38,891 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:55:38,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:55:38,894 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:55:38,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:55:38,895 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 03:55:39,758 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:55:39,758 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [145175185] [2022-02-24 03:55:39,758 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [145175185] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:55:39,758 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:55:39,759 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2022-02-24 03:55:39,759 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2007633107] [2022-02-24 03:55:39,759 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:55:39,759 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-02-24 03:55:39,759 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:55:39,759 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-02-24 03:55:39,759 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=914, Unknown=0, NotChecked=0, Total=1056 [2022-02-24 03:55:39,759 INFO L87 Difference]: Start difference. First operand 362 states and 436 transitions. Second operand has 31 states, 31 states have (on average 1.967741935483871) internal successors, (61), 30 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:55:41,877 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:55:41,878 INFO L93 Difference]: Finished difference Result 749 states and 886 transitions. [2022-02-24 03:55:41,878 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2022-02-24 03:55:41,878 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.967741935483871) internal successors, (61), 30 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 67 [2022-02-24 03:55:41,878 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:55:41,879 INFO L225 Difference]: With dead ends: 749 [2022-02-24 03:55:41,879 INFO L226 Difference]: Without dead ends: 443 [2022-02-24 03:55:41,879 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 14 SyntacticMatches, 21 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 580 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=170, Invalid=1020, Unknown=0, NotChecked=0, Total=1190 [2022-02-24 03:55:41,879 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 83 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 1579 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 84 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 1597 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 1579 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-02-24 03:55:41,879 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [84 Valid, 44 Invalid, 1597 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 1579 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-02-24 03:55:41,880 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 443 states. [2022-02-24 03:55:42,726 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 443 to 362. [2022-02-24 03:55:42,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 362 states, 352 states have (on average 1.2073863636363635) internal successors, (425), 352 states have internal predecessors, (425), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:55:42,727 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 362 states to 362 states and 436 transitions. [2022-02-24 03:55:42,727 INFO L78 Accepts]: Start accepts. Automaton has 362 states and 436 transitions. Word has length 67 [2022-02-24 03:55:42,727 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:55:42,728 INFO L470 AbstractCegarLoop]: Abstraction has 362 states and 436 transitions. [2022-02-24 03:55:42,728 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 1.967741935483871) internal successors, (61), 30 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:55:42,728 INFO L276 IsEmpty]: Start isEmpty. Operand 362 states and 436 transitions. [2022-02-24 03:55:42,728 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-02-24 03:55:42,728 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:55:42,728 INFO L514 BasicCegarLoop]: trace histogram [15, 15, 10, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:55:42,728 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable134 [2022-02-24 03:55:42,728 INFO L402 AbstractCegarLoop]: === Iteration 136 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:55:42,728 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:55:42,728 INFO L85 PathProgramCache]: Analyzing trace with hash -732082179, now seen corresponding path program 101 times [2022-02-24 03:55:42,728 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:55:42,728 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1136391215] [2022-02-24 03:55:42,729 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:55:42,729 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:55:42,855 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:55:42,984 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:55:42,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:55:43,085 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:55:43,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:55:43,087 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:55:43,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:55:43,089 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 03:55:43,978 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:55:43,978 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1136391215] [2022-02-24 03:55:43,979 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1136391215] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:55:43,979 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:55:43,979 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2022-02-24 03:55:43,979 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [640466144] [2022-02-24 03:55:43,979 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:55:43,979 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-02-24 03:55:43,979 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:55:43,979 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-02-24 03:55:43,979 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=973, Unknown=0, NotChecked=0, Total=1122 [2022-02-24 03:55:43,979 INFO L87 Difference]: Start difference. First operand 362 states and 436 transitions. Second operand has 32 states, 32 states have (on average 1.90625) internal successors, (61), 31 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:55:46,479 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:55:46,479 INFO L93 Difference]: Finished difference Result 743 states and 880 transitions. [2022-02-24 03:55:46,479 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2022-02-24 03:55:46,480 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.90625) internal successors, (61), 31 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 67 [2022-02-24 03:55:46,480 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:55:46,480 INFO L225 Difference]: With dead ends: 743 [2022-02-24 03:55:46,480 INFO L226 Difference]: Without dead ends: 437 [2022-02-24 03:55:46,481 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 15 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 561 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=153, Invalid=1037, Unknown=0, NotChecked=0, Total=1190 [2022-02-24 03:55:46,481 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 73 mSDsluCounter, 43 mSDsCounter, 0 mSdLazyCounter, 2289 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 64 SdHoareTripleChecker+Invalid, 2306 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 2289 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-02-24 03:55:46,481 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [74 Valid, 64 Invalid, 2306 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 2289 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-02-24 03:55:46,481 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 437 states. [2022-02-24 03:55:47,343 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 437 to 362. [2022-02-24 03:55:47,343 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 362 states, 352 states have (on average 1.2073863636363635) internal successors, (425), 352 states have internal predecessors, (425), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:55:47,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 362 states to 362 states and 436 transitions. [2022-02-24 03:55:47,344 INFO L78 Accepts]: Start accepts. Automaton has 362 states and 436 transitions. Word has length 67 [2022-02-24 03:55:47,344 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:55:47,344 INFO L470 AbstractCegarLoop]: Abstraction has 362 states and 436 transitions. [2022-02-24 03:55:47,344 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 1.90625) internal successors, (61), 31 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:55:47,344 INFO L276 IsEmpty]: Start isEmpty. Operand 362 states and 436 transitions. [2022-02-24 03:55:47,344 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-02-24 03:55:47,345 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:55:47,345 INFO L514 BasicCegarLoop]: trace histogram [15, 15, 11, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:55:47,345 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable135 [2022-02-24 03:55:47,345 INFO L402 AbstractCegarLoop]: === Iteration 137 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:55:47,345 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:55:47,345 INFO L85 PathProgramCache]: Analyzing trace with hash 1757446783, now seen corresponding path program 102 times [2022-02-24 03:55:47,345 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:55:47,345 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1577340765] [2022-02-24 03:55:47,345 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:55:47,345 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:55:47,476 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:55:47,605 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:55:47,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:55:47,708 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:55:47,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:55:47,711 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:55:47,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:55:47,712 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 03:55:48,724 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:55:48,725 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1577340765] [2022-02-24 03:55:48,725 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1577340765] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:55:48,725 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:55:48,725 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2022-02-24 03:55:48,725 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [487363122] [2022-02-24 03:55:48,725 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:55:48,725 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-02-24 03:55:48,725 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:55:48,725 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-02-24 03:55:48,726 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=1032, Unknown=0, NotChecked=0, Total=1190 [2022-02-24 03:55:48,726 INFO L87 Difference]: Start difference. First operand 362 states and 436 transitions. Second operand has 33 states, 33 states have (on average 1.8484848484848484) internal successors, (61), 32 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:55:50,754 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:55:50,754 INFO L93 Difference]: Finished difference Result 737 states and 874 transitions. [2022-02-24 03:55:50,755 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-02-24 03:55:50,755 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.8484848484848484) internal successors, (61), 32 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 67 [2022-02-24 03:55:50,755 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:55:50,755 INFO L225 Difference]: With dead ends: 737 [2022-02-24 03:55:50,755 INFO L226 Difference]: Without dead ends: 431 [2022-02-24 03:55:50,756 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 14 SyntacticMatches, 19 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 577 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=190, Invalid=1142, Unknown=0, NotChecked=0, Total=1332 [2022-02-24 03:55:50,756 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 102 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 1424 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 103 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 1444 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 1424 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-02-24 03:55:50,756 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [103 Valid, 37 Invalid, 1444 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 1424 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-02-24 03:55:50,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 431 states. [2022-02-24 03:55:51,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 431 to 362. [2022-02-24 03:55:51,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 362 states, 352 states have (on average 1.2073863636363635) internal successors, (425), 352 states have internal predecessors, (425), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:55:51,682 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 362 states to 362 states and 436 transitions. [2022-02-24 03:55:51,682 INFO L78 Accepts]: Start accepts. Automaton has 362 states and 436 transitions. Word has length 67 [2022-02-24 03:55:51,683 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:55:51,683 INFO L470 AbstractCegarLoop]: Abstraction has 362 states and 436 transitions. [2022-02-24 03:55:51,683 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 1.8484848484848484) internal successors, (61), 32 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:55:51,683 INFO L276 IsEmpty]: Start isEmpty. Operand 362 states and 436 transitions. [2022-02-24 03:55:51,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-02-24 03:55:51,683 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:55:51,683 INFO L514 BasicCegarLoop]: trace histogram [15, 15, 12, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:55:51,683 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable136 [2022-02-24 03:55:51,683 INFO L402 AbstractCegarLoop]: === Iteration 138 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:55:51,683 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:55:51,683 INFO L85 PathProgramCache]: Analyzing trace with hash 939798333, now seen corresponding path program 103 times [2022-02-24 03:55:51,683 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:55:51,683 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [290739116] [2022-02-24 03:55:51,684 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:55:51,684 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:55:51,816 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:55:51,948 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:55:51,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:55:52,051 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:55:52,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:55:52,054 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:55:52,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:55:52,055 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 03:55:53,112 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:55:53,113 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [290739116] [2022-02-24 03:55:53,113 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [290739116] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:55:53,113 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:55:53,113 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [34] imperfect sequences [] total 34 [2022-02-24 03:55:53,113 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [165434018] [2022-02-24 03:55:53,113 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:55:53,113 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2022-02-24 03:55:53,113 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:55:53,113 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2022-02-24 03:55:53,113 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=1094, Unknown=0, NotChecked=0, Total=1260 [2022-02-24 03:55:53,114 INFO L87 Difference]: Start difference. First operand 362 states and 436 transitions. Second operand has 34 states, 34 states have (on average 1.7941176470588236) internal successors, (61), 33 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:55:55,501 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:55:55,501 INFO L93 Difference]: Finished difference Result 731 states and 868 transitions. [2022-02-24 03:55:55,503 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-02-24 03:55:55,503 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 1.7941176470588236) internal successors, (61), 33 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 67 [2022-02-24 03:55:55,504 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:55:55,504 INFO L225 Difference]: With dead ends: 731 [2022-02-24 03:55:55,504 INFO L226 Difference]: Without dead ends: 425 [2022-02-24 03:55:55,505 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 14 SyntacticMatches, 18 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 562 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=200, Invalid=1206, Unknown=0, NotChecked=0, Total=1406 [2022-02-24 03:55:55,505 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 80 mSDsluCounter, 41 mSDsCounter, 0 mSdLazyCounter, 2254 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 81 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 2275 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 2254 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-02-24 03:55:55,505 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [81 Valid, 62 Invalid, 2275 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 2254 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-02-24 03:55:55,505 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 425 states. [2022-02-24 03:55:56,364 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 425 to 362. [2022-02-24 03:55:56,365 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 362 states, 352 states have (on average 1.2073863636363635) internal successors, (425), 352 states have internal predecessors, (425), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:55:56,365 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 362 states to 362 states and 436 transitions. [2022-02-24 03:55:56,365 INFO L78 Accepts]: Start accepts. Automaton has 362 states and 436 transitions. Word has length 67 [2022-02-24 03:55:56,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:55:56,365 INFO L470 AbstractCegarLoop]: Abstraction has 362 states and 436 transitions. [2022-02-24 03:55:56,366 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 1.7941176470588236) internal successors, (61), 33 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:55:56,366 INFO L276 IsEmpty]: Start isEmpty. Operand 362 states and 436 transitions. [2022-02-24 03:55:56,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-02-24 03:55:56,366 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:55:56,366 INFO L514 BasicCegarLoop]: trace histogram [15, 15, 13, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:55:56,366 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable137 [2022-02-24 03:55:56,366 INFO L402 AbstractCegarLoop]: === Iteration 139 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:55:56,366 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:55:56,366 INFO L85 PathProgramCache]: Analyzing trace with hash -648549569, now seen corresponding path program 104 times [2022-02-24 03:55:56,366 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:55:56,366 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [220437875] [2022-02-24 03:55:56,366 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:55:56,367 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:55:56,497 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:55:56,625 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:55:56,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:55:56,715 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:55:56,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:55:56,717 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:55:56,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:55:56,718 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 03:55:57,714 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:55:57,714 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [220437875] [2022-02-24 03:55:57,714 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [220437875] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:55:57,714 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:55:57,714 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2022-02-24 03:55:57,714 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1489599708] [2022-02-24 03:55:57,714 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:55:57,714 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-02-24 03:55:57,714 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:55:57,714 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-02-24 03:55:57,715 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=1158, Unknown=0, NotChecked=0, Total=1332 [2022-02-24 03:55:57,715 INFO L87 Difference]: Start difference. First operand 362 states and 436 transitions. Second operand has 35 states, 35 states have (on average 1.7428571428571429) internal successors, (61), 34 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:56:00,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:56:00,395 INFO L93 Difference]: Finished difference Result 728 states and 865 transitions. [2022-02-24 03:56:00,397 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-02-24 03:56:00,397 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.7428571428571429) internal successors, (61), 34 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 67 [2022-02-24 03:56:00,397 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:56:00,397 INFO L225 Difference]: With dead ends: 728 [2022-02-24 03:56:00,397 INFO L226 Difference]: Without dead ends: 422 [2022-02-24 03:56:00,398 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 14 SyntacticMatches, 17 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 538 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=210, Invalid=1272, Unknown=0, NotChecked=0, Total=1482 [2022-02-24 03:56:00,398 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 84 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 2640 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 85 SdHoareTripleChecker+Valid, 75 SdHoareTripleChecker+Invalid, 2662 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 2640 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2022-02-24 03:56:00,398 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [85 Valid, 75 Invalid, 2662 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 2640 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2022-02-24 03:56:00,398 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 422 states. [2022-02-24 03:56:01,283 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 422 to 362. [2022-02-24 03:56:01,284 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 362 states, 352 states have (on average 1.2073863636363635) internal successors, (425), 352 states have internal predecessors, (425), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:56:01,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 362 states to 362 states and 436 transitions. [2022-02-24 03:56:01,284 INFO L78 Accepts]: Start accepts. Automaton has 362 states and 436 transitions. Word has length 67 [2022-02-24 03:56:01,284 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:56:01,284 INFO L470 AbstractCegarLoop]: Abstraction has 362 states and 436 transitions. [2022-02-24 03:56:01,284 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.7428571428571429) internal successors, (61), 34 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:56:01,285 INFO L276 IsEmpty]: Start isEmpty. Operand 362 states and 436 transitions. [2022-02-24 03:56:01,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-02-24 03:56:01,285 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:56:01,285 INFO L514 BasicCegarLoop]: trace histogram [15, 15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:56:01,285 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable138 [2022-02-24 03:56:01,285 INFO L402 AbstractCegarLoop]: === Iteration 140 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:56:01,285 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:56:01,285 INFO L85 PathProgramCache]: Analyzing trace with hash -1659666819, now seen corresponding path program 105 times [2022-02-24 03:56:01,285 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:56:01,285 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [651685505] [2022-02-24 03:56:01,285 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:56:01,286 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:56:01,359 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:56:01,492 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:56:01,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:56:01,582 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:56:01,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:56:01,585 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:56:01,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:56:01,587 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 03:56:02,641 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:56:02,641 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [651685505] [2022-02-24 03:56:02,641 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [651685505] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:56:02,641 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:56:02,641 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [36] imperfect sequences [] total 36 [2022-02-24 03:56:02,641 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [499285187] [2022-02-24 03:56:02,641 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:56:02,641 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-02-24 03:56:02,642 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:56:02,642 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-02-24 03:56:02,642 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=182, Invalid=1224, Unknown=0, NotChecked=0, Total=1406 [2022-02-24 03:56:02,642 INFO L87 Difference]: Start difference. First operand 362 states and 436 transitions. Second operand has 36 states, 36 states have (on average 1.6944444444444444) internal successors, (61), 35 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:56:04,832 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:56:04,833 INFO L93 Difference]: Finished difference Result 731 states and 874 transitions. [2022-02-24 03:56:04,833 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-02-24 03:56:04,833 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 1.6944444444444444) internal successors, (61), 35 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 67 [2022-02-24 03:56:04,833 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:56:04,834 INFO L225 Difference]: With dead ends: 731 [2022-02-24 03:56:04,834 INFO L226 Difference]: Without dead ends: 425 [2022-02-24 03:56:04,834 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 14 SyntacticMatches, 16 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 505 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=220, Invalid=1340, Unknown=0, NotChecked=0, Total=1560 [2022-02-24 03:56:04,834 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 107 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 1814 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 108 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 1838 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 1814 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-02-24 03:56:04,834 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [108 Valid, 40 Invalid, 1838 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 1814 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-02-24 03:56:04,835 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 425 states. [2022-02-24 03:56:05,695 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 425 to 327. [2022-02-24 03:56:05,696 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 327 states, 317 states have (on average 1.195583596214511) internal successors, (379), 318 states have internal predecessors, (379), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:56:05,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 327 states to 327 states and 390 transitions. [2022-02-24 03:56:05,696 INFO L78 Accepts]: Start accepts. Automaton has 327 states and 390 transitions. Word has length 67 [2022-02-24 03:56:05,696 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:56:05,696 INFO L470 AbstractCegarLoop]: Abstraction has 327 states and 390 transitions. [2022-02-24 03:56:05,696 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 1.6944444444444444) internal successors, (61), 35 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:56:05,696 INFO L276 IsEmpty]: Start isEmpty. Operand 327 states and 390 transitions. [2022-02-24 03:56:05,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-02-24 03:56:05,697 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:56:05,697 INFO L514 BasicCegarLoop]: trace histogram [15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:56:05,697 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable139 [2022-02-24 03:56:05,697 INFO L402 AbstractCegarLoop]: === Iteration 141 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:56:05,697 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:56:05,697 INFO L85 PathProgramCache]: Analyzing trace with hash -1825207169, now seen corresponding path program 15 times [2022-02-24 03:56:05,697 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:56:05,697 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [41509743] [2022-02-24 03:56:05,697 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:56:05,697 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:56:05,741 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:56:05,785 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:56:05,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:56:05,817 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:56:05,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:56:05,823 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:56:05,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:56:05,824 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 03:56:06,666 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:56:06,666 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [41509743] [2022-02-24 03:56:06,666 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [41509743] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:56:06,666 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:56:06,666 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2022-02-24 03:56:06,666 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1411751266] [2022-02-24 03:56:06,666 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:56:06,667 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-02-24 03:56:06,667 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:56:06,667 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-02-24 03:56:06,667 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=1143, Unknown=0, NotChecked=0, Total=1260 [2022-02-24 03:56:06,667 INFO L87 Difference]: Start difference. First operand 327 states and 390 transitions. Second operand has 35 states, 35 states have (on average 1.7428571428571429) internal successors, (61), 34 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:56:09,202 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:56:09,202 INFO L93 Difference]: Finished difference Result 700 states and 832 transitions. [2022-02-24 03:56:09,204 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-02-24 03:56:09,204 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.7428571428571429) internal successors, (61), 34 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 67 [2022-02-24 03:56:09,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:56:09,205 INFO L225 Difference]: With dead ends: 700 [2022-02-24 03:56:09,205 INFO L226 Difference]: Without dead ends: 385 [2022-02-24 03:56:09,205 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 13 SyntacticMatches, 16 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 394 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=121, Invalid=1211, Unknown=0, NotChecked=0, Total=1332 [2022-02-24 03:56:09,205 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 79 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 2549 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 80 SdHoareTripleChecker+Valid, 53 SdHoareTripleChecker+Invalid, 2554 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 2549 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-02-24 03:56:09,205 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [80 Valid, 53 Invalid, 2554 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 2549 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2022-02-24 03:56:09,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 385 states. [2022-02-24 03:56:10,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 385 to 333. [2022-02-24 03:56:10,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 333 states, 323 states have (on average 1.1919504643962848) internal successors, (385), 324 states have internal predecessors, (385), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:56:10,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 333 states to 333 states and 396 transitions. [2022-02-24 03:56:10,073 INFO L78 Accepts]: Start accepts. Automaton has 333 states and 396 transitions. Word has length 67 [2022-02-24 03:56:10,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:56:10,073 INFO L470 AbstractCegarLoop]: Abstraction has 333 states and 396 transitions. [2022-02-24 03:56:10,073 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.7428571428571429) internal successors, (61), 34 states have internal predecessors, (61), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:56:10,073 INFO L276 IsEmpty]: Start isEmpty. Operand 333 states and 396 transitions. [2022-02-24 03:56:10,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2022-02-24 03:56:10,074 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:56:10,074 INFO L514 BasicCegarLoop]: trace histogram [16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:56:10,074 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable140 [2022-02-24 03:56:10,074 INFO L402 AbstractCegarLoop]: === Iteration 142 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:56:10,074 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:56:10,074 INFO L85 PathProgramCache]: Analyzing trace with hash -940321762, now seen corresponding path program 16 times [2022-02-24 03:56:10,074 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:56:10,074 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2050373299] [2022-02-24 03:56:10,074 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:56:10,074 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:56:10,167 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:56:10,262 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:56:10,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:56:10,299 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:56:10,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:56:10,307 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:56:10,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:56:10,309 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 03:56:11,072 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:56:11,072 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2050373299] [2022-02-24 03:56:11,072 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [2050373299] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:56:11,072 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:56:11,072 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2022-02-24 03:56:11,072 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1003364807] [2022-02-24 03:56:11,072 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:56:11,072 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-02-24 03:56:11,072 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:56:11,073 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-02-24 03:56:11,073 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=469, Unknown=0, NotChecked=0, Total=552 [2022-02-24 03:56:11,073 INFO L87 Difference]: Start difference. First operand 333 states and 396 transitions. Second operand has 23 states, 23 states have (on average 2.782608695652174) internal successors, (64), 22 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:56:13,608 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:56:13,609 INFO L93 Difference]: Finished difference Result 793 states and 922 transitions. [2022-02-24 03:56:13,609 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-02-24 03:56:13,609 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.782608695652174) internal successors, (64), 22 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 70 [2022-02-24 03:56:13,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:56:13,610 INFO L225 Difference]: With dead ends: 793 [2022-02-24 03:56:13,610 INFO L226 Difference]: Without dead ends: 472 [2022-02-24 03:56:13,610 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 15 SyntacticMatches, 32 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 118 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=87, Invalid=513, Unknown=0, NotChecked=0, Total=600 [2022-02-24 03:56:13,610 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 37 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 1552 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 60 SdHoareTripleChecker+Invalid, 1562 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1552 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-02-24 03:56:13,610 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 60 Invalid, 1562 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 1552 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-02-24 03:56:13,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 472 states. [2022-02-24 03:56:14,605 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 472 to 342. [2022-02-24 03:56:14,606 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 342 states, 332 states have (on average 1.1867469879518073) internal successors, (394), 333 states have internal predecessors, (394), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:56:14,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 342 states to 342 states and 405 transitions. [2022-02-24 03:56:14,606 INFO L78 Accepts]: Start accepts. Automaton has 342 states and 405 transitions. Word has length 70 [2022-02-24 03:56:14,606 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:56:14,606 INFO L470 AbstractCegarLoop]: Abstraction has 342 states and 405 transitions. [2022-02-24 03:56:14,606 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 2.782608695652174) internal successors, (64), 22 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:56:14,606 INFO L276 IsEmpty]: Start isEmpty. Operand 342 states and 405 transitions. [2022-02-24 03:56:14,607 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2022-02-24 03:56:14,607 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:56:14,607 INFO L514 BasicCegarLoop]: trace histogram [16, 16, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:56:14,607 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable141 [2022-02-24 03:56:14,607 INFO L402 AbstractCegarLoop]: === Iteration 143 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:56:14,607 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:56:14,607 INFO L85 PathProgramCache]: Analyzing trace with hash -899647012, now seen corresponding path program 106 times [2022-02-24 03:56:14,607 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:56:14,607 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [507551418] [2022-02-24 03:56:14,607 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:56:14,607 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:56:14,741 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:56:14,876 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:56:14,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:56:14,964 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:56:14,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:56:14,967 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:56:14,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:56:14,968 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 03:56:15,893 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:56:15,893 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [507551418] [2022-02-24 03:56:15,893 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [507551418] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:56:15,893 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:56:15,893 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2022-02-24 03:56:15,893 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [658066973] [2022-02-24 03:56:15,893 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:56:15,893 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-02-24 03:56:15,893 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:56:15,894 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-02-24 03:56:15,894 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=569, Unknown=0, NotChecked=0, Total=650 [2022-02-24 03:56:15,894 INFO L87 Difference]: Start difference. First operand 342 states and 405 transitions. Second operand has 24 states, 24 states have (on average 2.6666666666666665) internal successors, (64), 23 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:56:18,520 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:56:18,520 INFO L93 Difference]: Finished difference Result 811 states and 940 transitions. [2022-02-24 03:56:18,522 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-02-24 03:56:18,522 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.6666666666666665) internal successors, (64), 23 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 70 [2022-02-24 03:56:18,523 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:56:18,523 INFO L225 Difference]: With dead ends: 811 [2022-02-24 03:56:18,523 INFO L226 Difference]: Without dead ends: 481 [2022-02-24 03:56:18,524 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 14 SyntacticMatches, 31 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 247 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=93, Invalid=663, Unknown=0, NotChecked=0, Total=756 [2022-02-24 03:56:18,524 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 41 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 1592 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 1602 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1592 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-02-24 03:56:18,524 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [42 Valid, 61 Invalid, 1602 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 1592 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-02-24 03:56:18,524 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 481 states. [2022-02-24 03:56:19,533 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 481 to 342. [2022-02-24 03:56:19,534 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 342 states, 332 states have (on average 1.1867469879518073) internal successors, (394), 333 states have internal predecessors, (394), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:56:19,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 342 states to 342 states and 405 transitions. [2022-02-24 03:56:19,534 INFO L78 Accepts]: Start accepts. Automaton has 342 states and 405 transitions. Word has length 70 [2022-02-24 03:56:19,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:56:19,534 INFO L470 AbstractCegarLoop]: Abstraction has 342 states and 405 transitions. [2022-02-24 03:56:19,534 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 2.6666666666666665) internal successors, (64), 23 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:56:19,534 INFO L276 IsEmpty]: Start isEmpty. Operand 342 states and 405 transitions. [2022-02-24 03:56:19,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2022-02-24 03:56:19,535 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:56:19,535 INFO L514 BasicCegarLoop]: trace histogram [16, 16, 14, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:56:19,535 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable142 [2022-02-24 03:56:19,535 INFO L402 AbstractCegarLoop]: === Iteration 144 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:56:19,535 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:56:19,535 INFO L85 PathProgramCache]: Analyzing trace with hash -455746338, now seen corresponding path program 107 times [2022-02-24 03:56:19,535 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:56:19,535 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2037643577] [2022-02-24 03:56:19,535 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:56:19,535 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:56:19,670 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:56:19,802 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:56:19,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:56:19,898 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:56:19,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:56:19,900 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:56:19,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:56:19,902 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 03:56:20,801 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:56:20,801 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2037643577] [2022-02-24 03:56:20,801 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [2037643577] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:56:20,801 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:56:20,802 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2022-02-24 03:56:20,802 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [650279386] [2022-02-24 03:56:20,802 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:56:20,802 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-02-24 03:56:20,802 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:56:20,802 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-02-24 03:56:20,802 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=613, Unknown=0, NotChecked=0, Total=702 [2022-02-24 03:56:20,802 INFO L87 Difference]: Start difference. First operand 342 states and 405 transitions. Second operand has 25 states, 25 states have (on average 2.56) internal successors, (64), 24 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:56:23,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:56:23,634 INFO L93 Difference]: Finished difference Result 805 states and 934 transitions. [2022-02-24 03:56:23,635 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-02-24 03:56:23,635 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.56) internal successors, (64), 24 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 70 [2022-02-24 03:56:23,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:56:23,635 INFO L225 Difference]: With dead ends: 805 [2022-02-24 03:56:23,635 INFO L226 Difference]: Without dead ends: 475 [2022-02-24 03:56:23,636 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 14 SyntacticMatches, 30 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 328 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=103, Invalid=709, Unknown=0, NotChecked=0, Total=812 [2022-02-24 03:56:23,636 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 48 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 1419 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 1430 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 1419 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-02-24 03:56:23,636 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [49 Valid, 48 Invalid, 1430 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 1419 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-02-24 03:56:23,636 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 475 states. [2022-02-24 03:56:24,656 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 475 to 342. [2022-02-24 03:56:24,657 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 342 states, 332 states have (on average 1.1867469879518073) internal successors, (394), 333 states have internal predecessors, (394), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:56:24,657 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 342 states to 342 states and 405 transitions. [2022-02-24 03:56:24,657 INFO L78 Accepts]: Start accepts. Automaton has 342 states and 405 transitions. Word has length 70 [2022-02-24 03:56:24,657 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:56:24,657 INFO L470 AbstractCegarLoop]: Abstraction has 342 states and 405 transitions. [2022-02-24 03:56:24,658 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 2.56) internal successors, (64), 24 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:56:24,658 INFO L276 IsEmpty]: Start isEmpty. Operand 342 states and 405 transitions. [2022-02-24 03:56:24,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2022-02-24 03:56:24,658 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:56:24,658 INFO L514 BasicCegarLoop]: trace histogram [16, 16, 13, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:56:24,658 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable143 [2022-02-24 03:56:24,658 INFO L402 AbstractCegarLoop]: === Iteration 145 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:56:24,658 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:56:24,658 INFO L85 PathProgramCache]: Analyzing trace with hash -936826596, now seen corresponding path program 108 times [2022-02-24 03:56:24,658 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:56:24,659 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [363141454] [2022-02-24 03:56:24,659 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:56:24,659 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:56:24,797 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:56:24,929 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:56:24,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:56:25,031 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:56:25,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:56:25,038 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:56:25,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:56:25,040 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 03:56:25,930 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:56:25,930 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [363141454] [2022-02-24 03:56:25,930 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [363141454] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:56:25,930 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:56:25,930 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2022-02-24 03:56:25,930 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1353074722] [2022-02-24 03:56:25,930 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:56:25,930 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-02-24 03:56:25,930 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:56:25,931 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-02-24 03:56:25,931 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=659, Unknown=0, NotChecked=0, Total=756 [2022-02-24 03:56:25,931 INFO L87 Difference]: Start difference. First operand 342 states and 405 transitions. Second operand has 26 states, 26 states have (on average 2.4615384615384617) internal successors, (64), 25 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:56:28,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:56:28,635 INFO L93 Difference]: Finished difference Result 799 states and 928 transitions. [2022-02-24 03:56:28,635 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-02-24 03:56:28,635 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.4615384615384617) internal successors, (64), 25 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 70 [2022-02-24 03:56:28,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:56:28,636 INFO L225 Difference]: With dead ends: 799 [2022-02-24 03:56:28,636 INFO L226 Difference]: Without dead ends: 469 [2022-02-24 03:56:28,636 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 14 SyntacticMatches, 29 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 400 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=113, Invalid=757, Unknown=0, NotChecked=0, Total=870 [2022-02-24 03:56:28,637 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 52 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 1540 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 1552 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 1540 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-02-24 03:56:28,637 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [53 Valid, 58 Invalid, 1552 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 1540 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-02-24 03:56:28,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 469 states. [2022-02-24 03:56:29,692 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 469 to 342. [2022-02-24 03:56:29,693 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 342 states, 332 states have (on average 1.1867469879518073) internal successors, (394), 333 states have internal predecessors, (394), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:56:29,693 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 342 states to 342 states and 405 transitions. [2022-02-24 03:56:29,693 INFO L78 Accepts]: Start accepts. Automaton has 342 states and 405 transitions. Word has length 70 [2022-02-24 03:56:29,693 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:56:29,693 INFO L470 AbstractCegarLoop]: Abstraction has 342 states and 405 transitions. [2022-02-24 03:56:29,694 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 2.4615384615384617) internal successors, (64), 25 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:56:29,694 INFO L276 IsEmpty]: Start isEmpty. Operand 342 states and 405 transitions. [2022-02-24 03:56:29,694 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2022-02-24 03:56:29,694 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:56:29,694 INFO L514 BasicCegarLoop]: trace histogram [16, 16, 12, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:56:29,694 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable144 [2022-02-24 03:56:29,694 INFO L402 AbstractCegarLoop]: === Iteration 146 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:56:29,694 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:56:29,694 INFO L85 PathProgramCache]: Analyzing trace with hash -1289914978, now seen corresponding path program 109 times [2022-02-24 03:56:29,694 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:56:29,694 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1068105359] [2022-02-24 03:56:29,694 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:56:29,695 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:56:29,830 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:56:29,961 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:56:29,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:56:30,063 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:56:30,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:56:30,065 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:56:30,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:56:30,067 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 03:56:30,977 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:56:30,977 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1068105359] [2022-02-24 03:56:30,977 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1068105359] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:56:30,977 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:56:30,977 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2022-02-24 03:56:30,978 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1155378482] [2022-02-24 03:56:30,978 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:56:30,978 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-02-24 03:56:30,978 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:56:30,978 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-02-24 03:56:30,978 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=707, Unknown=0, NotChecked=0, Total=812 [2022-02-24 03:56:30,978 INFO L87 Difference]: Start difference. First operand 342 states and 405 transitions. Second operand has 27 states, 27 states have (on average 2.3703703703703702) internal successors, (64), 26 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:56:33,691 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:56:33,691 INFO L93 Difference]: Finished difference Result 793 states and 922 transitions. [2022-02-24 03:56:33,691 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-02-24 03:56:33,691 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 2.3703703703703702) internal successors, (64), 26 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 70 [2022-02-24 03:56:33,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:56:33,692 INFO L225 Difference]: With dead ends: 793 [2022-02-24 03:56:33,692 INFO L226 Difference]: Without dead ends: 463 [2022-02-24 03:56:33,692 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 14 SyntacticMatches, 28 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 463 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=123, Invalid=807, Unknown=0, NotChecked=0, Total=930 [2022-02-24 03:56:33,693 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 56 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 1571 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 1584 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 1571 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-02-24 03:56:33,693 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [57 Valid, 51 Invalid, 1584 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 1571 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-02-24 03:56:33,693 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 463 states. [2022-02-24 03:56:34,775 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 463 to 342. [2022-02-24 03:56:34,776 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 342 states, 332 states have (on average 1.1867469879518073) internal successors, (394), 333 states have internal predecessors, (394), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:56:34,776 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 342 states to 342 states and 405 transitions. [2022-02-24 03:56:34,776 INFO L78 Accepts]: Start accepts. Automaton has 342 states and 405 transitions. Word has length 70 [2022-02-24 03:56:34,776 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:56:34,776 INFO L470 AbstractCegarLoop]: Abstraction has 342 states and 405 transitions. [2022-02-24 03:56:34,777 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 2.3703703703703702) internal successors, (64), 26 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:56:34,777 INFO L276 IsEmpty]: Start isEmpty. Operand 342 states and 405 transitions. [2022-02-24 03:56:34,777 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2022-02-24 03:56:34,777 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:56:34,777 INFO L514 BasicCegarLoop]: trace histogram [16, 16, 11, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:56:34,777 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable145 [2022-02-24 03:56:34,777 INFO L402 AbstractCegarLoop]: === Iteration 147 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:56:34,777 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:56:34,777 INFO L85 PathProgramCache]: Analyzing trace with hash 955664476, now seen corresponding path program 110 times [2022-02-24 03:56:34,777 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:56:34,777 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1140544224] [2022-02-24 03:56:34,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:56:34,778 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:56:34,909 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:56:35,044 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:56:35,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:56:35,135 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:56:35,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:56:35,138 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:56:35,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:56:35,139 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 03:56:36,061 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:56:36,062 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1140544224] [2022-02-24 03:56:36,062 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1140544224] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:56:36,062 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:56:36,062 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [] total 28 [2022-02-24 03:56:36,062 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1450443309] [2022-02-24 03:56:36,062 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:56:36,062 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-02-24 03:56:36,062 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:56:36,062 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-02-24 03:56:36,062 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=757, Unknown=0, NotChecked=0, Total=870 [2022-02-24 03:56:36,062 INFO L87 Difference]: Start difference. First operand 342 states and 405 transitions. Second operand has 28 states, 28 states have (on average 2.2857142857142856) internal successors, (64), 27 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:56:38,718 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:56:38,719 INFO L93 Difference]: Finished difference Result 787 states and 916 transitions. [2022-02-24 03:56:38,719 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-02-24 03:56:38,719 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 2.2857142857142856) internal successors, (64), 27 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 70 [2022-02-24 03:56:38,719 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:56:38,720 INFO L225 Difference]: With dead ends: 787 [2022-02-24 03:56:38,720 INFO L226 Difference]: Without dead ends: 457 [2022-02-24 03:56:38,720 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 14 SyntacticMatches, 27 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 517 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=133, Invalid=859, Unknown=0, NotChecked=0, Total=992 [2022-02-24 03:56:38,720 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 62 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 1702 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 1716 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 1702 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-02-24 03:56:38,720 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [63 Valid, 49 Invalid, 1716 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 1702 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-02-24 03:56:38,721 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 457 states. [2022-02-24 03:56:39,786 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 457 to 342. [2022-02-24 03:56:39,786 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 342 states, 332 states have (on average 1.1867469879518073) internal successors, (394), 333 states have internal predecessors, (394), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:56:39,786 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 342 states to 342 states and 405 transitions. [2022-02-24 03:56:39,786 INFO L78 Accepts]: Start accepts. Automaton has 342 states and 405 transitions. Word has length 70 [2022-02-24 03:56:39,787 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:56:39,787 INFO L470 AbstractCegarLoop]: Abstraction has 342 states and 405 transitions. [2022-02-24 03:56:39,787 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 2.2857142857142856) internal successors, (64), 27 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:56:39,787 INFO L276 IsEmpty]: Start isEmpty. Operand 342 states and 405 transitions. [2022-02-24 03:56:39,787 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2022-02-24 03:56:39,787 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:56:39,787 INFO L514 BasicCegarLoop]: trace histogram [16, 16, 10, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:56:39,787 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable146 [2022-02-24 03:56:39,787 INFO L402 AbstractCegarLoop]: === Iteration 148 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:56:39,787 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:56:39,787 INFO L85 PathProgramCache]: Analyzing trace with hash 1379311198, now seen corresponding path program 111 times [2022-02-24 03:56:39,787 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:56:39,788 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [584149366] [2022-02-24 03:56:39,788 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:56:39,788 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:56:39,922 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:56:40,057 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:56:40,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:56:40,153 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:56:40,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:56:40,156 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:56:40,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:56:40,157 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 03:56:41,101 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:56:41,101 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [584149366] [2022-02-24 03:56:41,101 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [584149366] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:56:41,101 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:56:41,101 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2022-02-24 03:56:41,101 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [36586145] [2022-02-24 03:56:41,101 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:56:41,101 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-02-24 03:56:41,101 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:56:41,102 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-02-24 03:56:41,102 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=121, Invalid=809, Unknown=0, NotChecked=0, Total=930 [2022-02-24 03:56:41,102 INFO L87 Difference]: Start difference. First operand 342 states and 405 transitions. Second operand has 29 states, 29 states have (on average 2.206896551724138) internal successors, (64), 28 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:56:43,903 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:56:43,903 INFO L93 Difference]: Finished difference Result 781 states and 910 transitions. [2022-02-24 03:56:43,904 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-02-24 03:56:43,904 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 2.206896551724138) internal successors, (64), 28 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 70 [2022-02-24 03:56:43,904 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:56:43,904 INFO L225 Difference]: With dead ends: 781 [2022-02-24 03:56:43,904 INFO L226 Difference]: Without dead ends: 451 [2022-02-24 03:56:43,905 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 14 SyntacticMatches, 26 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 562 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=143, Invalid=913, Unknown=0, NotChecked=0, Total=1056 [2022-02-24 03:56:43,905 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 59 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 1900 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 1915 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 1900 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-02-24 03:56:43,905 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [60 Valid, 57 Invalid, 1915 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 1900 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-02-24 03:56:43,905 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 451 states. [2022-02-24 03:56:45,001 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 451 to 342. [2022-02-24 03:56:45,002 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 342 states, 332 states have (on average 1.1867469879518073) internal successors, (394), 333 states have internal predecessors, (394), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:56:45,002 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 342 states to 342 states and 405 transitions. [2022-02-24 03:56:45,002 INFO L78 Accepts]: Start accepts. Automaton has 342 states and 405 transitions. Word has length 70 [2022-02-24 03:56:45,002 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:56:45,002 INFO L470 AbstractCegarLoop]: Abstraction has 342 states and 405 transitions. [2022-02-24 03:56:45,003 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 2.206896551724138) internal successors, (64), 28 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:56:45,003 INFO L276 IsEmpty]: Start isEmpty. Operand 342 states and 405 transitions. [2022-02-24 03:56:45,003 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2022-02-24 03:56:45,003 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:56:45,003 INFO L514 BasicCegarLoop]: trace histogram [16, 16, 9, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:56:45,003 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable147 [2022-02-24 03:56:45,003 INFO L402 AbstractCegarLoop]: === Iteration 149 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:56:45,003 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:56:45,003 INFO L85 PathProgramCache]: Analyzing trace with hash 349951900, now seen corresponding path program 112 times [2022-02-24 03:56:45,003 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:56:45,004 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1891494316] [2022-02-24 03:56:45,004 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:56:45,004 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:56:45,167 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:56:45,304 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:56:45,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:56:45,405 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:56:45,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:56:45,408 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:56:45,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:56:45,409 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 03:56:46,456 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:56:46,456 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1891494316] [2022-02-24 03:56:46,456 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1891494316] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:56:46,456 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:56:46,456 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2022-02-24 03:56:46,456 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1555895768] [2022-02-24 03:56:46,456 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:56:46,456 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-02-24 03:56:46,456 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:56:46,457 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-02-24 03:56:46,457 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=863, Unknown=0, NotChecked=0, Total=992 [2022-02-24 03:56:46,457 INFO L87 Difference]: Start difference. First operand 342 states and 405 transitions. Second operand has 30 states, 30 states have (on average 2.1333333333333333) internal successors, (64), 29 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:56:49,253 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:56:49,253 INFO L93 Difference]: Finished difference Result 775 states and 904 transitions. [2022-02-24 03:56:49,255 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-02-24 03:56:49,256 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 2.1333333333333333) internal successors, (64), 29 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 70 [2022-02-24 03:56:49,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:56:49,256 INFO L225 Difference]: With dead ends: 775 [2022-02-24 03:56:49,256 INFO L226 Difference]: Without dead ends: 445 [2022-02-24 03:56:49,257 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 14 SyntacticMatches, 25 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 598 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=153, Invalid=969, Unknown=0, NotChecked=0, Total=1122 [2022-02-24 03:56:49,257 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 64 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 1921 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 53 SdHoareTripleChecker+Invalid, 1937 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 1921 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-02-24 03:56:49,257 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [65 Valid, 53 Invalid, 1937 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 1921 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-02-24 03:56:49,257 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 445 states. [2022-02-24 03:56:50,347 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 445 to 342. [2022-02-24 03:56:50,347 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 342 states, 332 states have (on average 1.1867469879518073) internal successors, (394), 333 states have internal predecessors, (394), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:56:50,348 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 342 states to 342 states and 405 transitions. [2022-02-24 03:56:50,348 INFO L78 Accepts]: Start accepts. Automaton has 342 states and 405 transitions. Word has length 70 [2022-02-24 03:56:50,348 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:56:50,348 INFO L470 AbstractCegarLoop]: Abstraction has 342 states and 405 transitions. [2022-02-24 03:56:50,348 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 2.1333333333333333) internal successors, (64), 29 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:56:50,348 INFO L276 IsEmpty]: Start isEmpty. Operand 342 states and 405 transitions. [2022-02-24 03:56:50,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2022-02-24 03:56:50,348 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:56:50,348 INFO L514 BasicCegarLoop]: trace histogram [16, 16, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:56:50,349 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable148 [2022-02-24 03:56:50,349 INFO L402 AbstractCegarLoop]: === Iteration 150 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:56:50,349 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:56:50,349 INFO L85 PathProgramCache]: Analyzing trace with hash -494053602, now seen corresponding path program 113 times [2022-02-24 03:56:50,349 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:56:50,349 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1489905056] [2022-02-24 03:56:50,349 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:56:50,349 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:56:50,486 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:56:50,629 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:56:50,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:56:50,741 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:56:50,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:56:50,743 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:56:50,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:56:50,745 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 03:56:51,904 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:56:51,904 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1489905056] [2022-02-24 03:56:51,904 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1489905056] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:56:51,904 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:56:51,904 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2022-02-24 03:56:51,904 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [511463256] [2022-02-24 03:56:51,904 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:56:51,905 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-02-24 03:56:51,905 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:56:51,905 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-02-24 03:56:51,905 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=137, Invalid=919, Unknown=0, NotChecked=0, Total=1056 [2022-02-24 03:56:51,905 INFO L87 Difference]: Start difference. First operand 342 states and 405 transitions. Second operand has 31 states, 31 states have (on average 2.064516129032258) internal successors, (64), 30 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:56:54,629 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:56:54,629 INFO L93 Difference]: Finished difference Result 769 states and 898 transitions. [2022-02-24 03:56:54,631 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2022-02-24 03:56:54,631 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 2.064516129032258) internal successors, (64), 30 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 70 [2022-02-24 03:56:54,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:56:54,632 INFO L225 Difference]: With dead ends: 769 [2022-02-24 03:56:54,632 INFO L226 Difference]: Without dead ends: 439 [2022-02-24 03:56:54,633 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 14 SyntacticMatches, 24 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 625 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=163, Invalid=1027, Unknown=0, NotChecked=0, Total=1190 [2022-02-24 03:56:54,633 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 75 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 1622 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 76 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 1639 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 1622 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-02-24 03:56:54,633 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [76 Valid, 49 Invalid, 1639 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 1622 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-02-24 03:56:54,633 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 439 states. [2022-02-24 03:56:55,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 439 to 342. [2022-02-24 03:56:55,756 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 342 states, 332 states have (on average 1.1867469879518073) internal successors, (394), 333 states have internal predecessors, (394), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:56:55,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 342 states to 342 states and 405 transitions. [2022-02-24 03:56:55,756 INFO L78 Accepts]: Start accepts. Automaton has 342 states and 405 transitions. Word has length 70 [2022-02-24 03:56:55,756 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:56:55,756 INFO L470 AbstractCegarLoop]: Abstraction has 342 states and 405 transitions. [2022-02-24 03:56:55,757 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 2.064516129032258) internal successors, (64), 30 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:56:55,757 INFO L276 IsEmpty]: Start isEmpty. Operand 342 states and 405 transitions. [2022-02-24 03:56:55,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2022-02-24 03:56:55,757 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:56:55,757 INFO L514 BasicCegarLoop]: trace histogram [16, 16, 9, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:56:55,757 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable149 [2022-02-24 03:56:55,757 INFO L402 AbstractCegarLoop]: === Iteration 151 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:56:55,757 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:56:55,757 INFO L85 PathProgramCache]: Analyzing trace with hash -219293988, now seen corresponding path program 114 times [2022-02-24 03:56:55,757 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:56:55,757 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1239709543] [2022-02-24 03:56:55,757 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:56:55,758 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:56:55,918 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:56:56,061 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:56:56,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:56:56,161 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:56:56,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:56:56,164 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:56:56,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:56:56,165 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 03:56:57,393 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:56:57,393 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1239709543] [2022-02-24 03:56:57,393 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1239709543] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:56:57,393 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:56:57,393 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2022-02-24 03:56:57,393 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1589193048] [2022-02-24 03:56:57,393 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:56:57,393 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-02-24 03:56:57,393 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:56:57,394 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-02-24 03:56:57,394 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=145, Invalid=977, Unknown=0, NotChecked=0, Total=1122 [2022-02-24 03:56:57,394 INFO L87 Difference]: Start difference. First operand 342 states and 405 transitions. Second operand has 32 states, 32 states have (on average 2.0) internal successors, (64), 31 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:57:00,429 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:57:00,430 INFO L93 Difference]: Finished difference Result 763 states and 892 transitions. [2022-02-24 03:57:00,430 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-02-24 03:57:00,430 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 2.0) internal successors, (64), 31 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 70 [2022-02-24 03:57:00,430 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:57:00,431 INFO L225 Difference]: With dead ends: 763 [2022-02-24 03:57:00,431 INFO L226 Difference]: Without dead ends: 433 [2022-02-24 03:57:00,431 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 14 SyntacticMatches, 23 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 643 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=173, Invalid=1087, Unknown=0, NotChecked=0, Total=1260 [2022-02-24 03:57:00,431 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 76 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 2221 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 77 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 2239 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 2221 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-02-24 03:57:00,431 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [77 Valid, 51 Invalid, 2239 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 2221 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-02-24 03:57:00,432 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 433 states. [2022-02-24 03:57:01,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 433 to 342. [2022-02-24 03:57:01,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 342 states, 332 states have (on average 1.1867469879518073) internal successors, (394), 333 states have internal predecessors, (394), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:57:01,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 342 states to 342 states and 405 transitions. [2022-02-24 03:57:01,548 INFO L78 Accepts]: Start accepts. Automaton has 342 states and 405 transitions. Word has length 70 [2022-02-24 03:57:01,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:57:01,548 INFO L470 AbstractCegarLoop]: Abstraction has 342 states and 405 transitions. [2022-02-24 03:57:01,548 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 2.0) internal successors, (64), 31 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:57:01,548 INFO L276 IsEmpty]: Start isEmpty. Operand 342 states and 405 transitions. [2022-02-24 03:57:01,548 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2022-02-24 03:57:01,549 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:57:01,549 INFO L514 BasicCegarLoop]: trace histogram [16, 16, 10, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:57:01,549 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable150 [2022-02-24 03:57:01,549 INFO L402 AbstractCegarLoop]: === Iteration 152 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:57:01,549 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:57:01,549 INFO L85 PathProgramCache]: Analyzing trace with hash 1166909406, now seen corresponding path program 115 times [2022-02-24 03:57:01,549 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:57:01,549 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1807216455] [2022-02-24 03:57:01,549 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:57:01,549 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:57:01,687 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:57:01,822 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:57:01,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:57:01,925 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:57:01,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:57:01,928 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:57:01,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:57:01,929 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 03:57:02,992 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:57:02,993 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1807216455] [2022-02-24 03:57:02,993 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1807216455] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:57:02,993 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:57:02,993 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2022-02-24 03:57:02,993 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1976205160] [2022-02-24 03:57:02,993 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:57:02,993 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-02-24 03:57:02,993 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:57:02,993 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-02-24 03:57:02,993 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=1037, Unknown=0, NotChecked=0, Total=1190 [2022-02-24 03:57:02,994 INFO L87 Difference]: Start difference. First operand 342 states and 405 transitions. Second operand has 33 states, 33 states have (on average 1.9393939393939394) internal successors, (64), 32 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:57:05,736 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:57:05,736 INFO L93 Difference]: Finished difference Result 757 states and 886 transitions. [2022-02-24 03:57:05,738 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-02-24 03:57:05,738 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.9393939393939394) internal successors, (64), 32 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 70 [2022-02-24 03:57:05,739 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:57:05,739 INFO L225 Difference]: With dead ends: 757 [2022-02-24 03:57:05,739 INFO L226 Difference]: Without dead ends: 427 [2022-02-24 03:57:05,740 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 14 SyntacticMatches, 22 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 652 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=183, Invalid=1149, Unknown=0, NotChecked=0, Total=1332 [2022-02-24 03:57:05,740 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 89 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 1795 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 90 SdHoareTripleChecker+Valid, 47 SdHoareTripleChecker+Invalid, 1814 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 1795 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-02-24 03:57:05,740 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [90 Valid, 47 Invalid, 1814 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 1795 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-02-24 03:57:05,740 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 427 states. [2022-02-24 03:57:06,872 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 427 to 342. [2022-02-24 03:57:06,872 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 342 states, 332 states have (on average 1.1867469879518073) internal successors, (394), 333 states have internal predecessors, (394), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:57:06,873 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 342 states to 342 states and 405 transitions. [2022-02-24 03:57:06,873 INFO L78 Accepts]: Start accepts. Automaton has 342 states and 405 transitions. Word has length 70 [2022-02-24 03:57:06,873 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:57:06,873 INFO L470 AbstractCegarLoop]: Abstraction has 342 states and 405 transitions. [2022-02-24 03:57:06,873 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 1.9393939393939394) internal successors, (64), 32 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:57:06,873 INFO L276 IsEmpty]: Start isEmpty. Operand 342 states and 405 transitions. [2022-02-24 03:57:06,873 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2022-02-24 03:57:06,873 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:57:06,873 INFO L514 BasicCegarLoop]: trace histogram [16, 16, 11, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:57:06,874 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable151 [2022-02-24 03:57:06,874 INFO L402 AbstractCegarLoop]: === Iteration 153 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:57:06,874 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:57:06,874 INFO L85 PathProgramCache]: Analyzing trace with hash 1228949020, now seen corresponding path program 116 times [2022-02-24 03:57:06,874 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:57:06,874 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1690527833] [2022-02-24 03:57:06,874 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:57:06,874 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:57:07,011 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:57:07,164 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:57:07,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:57:07,306 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:57:07,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:57:07,309 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:57:07,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:57:07,310 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 03:57:08,400 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:57:08,400 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1690527833] [2022-02-24 03:57:08,400 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1690527833] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:57:08,400 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:57:08,400 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [34] imperfect sequences [] total 34 [2022-02-24 03:57:08,400 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [628241719] [2022-02-24 03:57:08,400 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:57:08,401 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2022-02-24 03:57:08,401 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:57:08,401 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2022-02-24 03:57:08,401 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=161, Invalid=1099, Unknown=0, NotChecked=0, Total=1260 [2022-02-24 03:57:08,401 INFO L87 Difference]: Start difference. First operand 342 states and 405 transitions. Second operand has 34 states, 34 states have (on average 1.8823529411764706) internal successors, (64), 33 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:57:11,537 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:57:11,537 INFO L93 Difference]: Finished difference Result 751 states and 880 transitions. [2022-02-24 03:57:11,540 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-02-24 03:57:11,540 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 1.8823529411764706) internal successors, (64), 33 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 70 [2022-02-24 03:57:11,540 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:57:11,540 INFO L225 Difference]: With dead ends: 751 [2022-02-24 03:57:11,540 INFO L226 Difference]: Without dead ends: 421 [2022-02-24 03:57:11,541 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 14 SyntacticMatches, 21 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 652 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=193, Invalid=1213, Unknown=0, NotChecked=0, Total=1406 [2022-02-24 03:57:11,541 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 78 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 2568 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 79 SdHoareTripleChecker+Valid, 67 SdHoareTripleChecker+Invalid, 2588 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 2568 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2022-02-24 03:57:11,541 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [79 Valid, 67 Invalid, 2588 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 2568 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2022-02-24 03:57:11,541 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 421 states. [2022-02-24 03:57:12,649 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 421 to 342. [2022-02-24 03:57:12,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 342 states, 332 states have (on average 1.1867469879518073) internal successors, (394), 333 states have internal predecessors, (394), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:57:12,650 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 342 states to 342 states and 405 transitions. [2022-02-24 03:57:12,650 INFO L78 Accepts]: Start accepts. Automaton has 342 states and 405 transitions. Word has length 70 [2022-02-24 03:57:12,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:57:12,650 INFO L470 AbstractCegarLoop]: Abstraction has 342 states and 405 transitions. [2022-02-24 03:57:12,650 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 1.8823529411764706) internal successors, (64), 33 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:57:12,650 INFO L276 IsEmpty]: Start isEmpty. Operand 342 states and 405 transitions. [2022-02-24 03:57:12,650 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2022-02-24 03:57:12,650 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:57:12,650 INFO L514 BasicCegarLoop]: trace histogram [16, 16, 12, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:57:12,650 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable152 [2022-02-24 03:57:12,650 INFO L402 AbstractCegarLoop]: === Iteration 154 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:57:12,650 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:57:12,651 INFO L85 PathProgramCache]: Analyzing trace with hash -576489314, now seen corresponding path program 117 times [2022-02-24 03:57:12,651 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:57:12,651 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [16912371] [2022-02-24 03:57:12,651 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:57:12,651 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:57:12,789 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:57:12,925 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:57:12,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:57:13,029 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:57:13,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:57:13,044 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:57:13,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:57:13,046 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 03:57:14,203 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:57:14,203 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [16912371] [2022-02-24 03:57:14,203 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [16912371] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:57:14,203 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:57:14,203 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2022-02-24 03:57:14,203 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [699102125] [2022-02-24 03:57:14,203 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:57:14,203 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-02-24 03:57:14,203 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:57:14,203 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-02-24 03:57:14,204 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=169, Invalid=1163, Unknown=0, NotChecked=0, Total=1332 [2022-02-24 03:57:14,204 INFO L87 Difference]: Start difference. First operand 342 states and 405 transitions. Second operand has 35 states, 35 states have (on average 1.8285714285714285) internal successors, (64), 34 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:57:17,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:57:17,146 INFO L93 Difference]: Finished difference Result 745 states and 874 transitions. [2022-02-24 03:57:17,146 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-02-24 03:57:17,146 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.8285714285714285) internal successors, (64), 34 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 70 [2022-02-24 03:57:17,146 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:57:17,147 INFO L225 Difference]: With dead ends: 745 [2022-02-24 03:57:17,147 INFO L226 Difference]: Without dead ends: 415 [2022-02-24 03:57:17,147 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 14 SyntacticMatches, 20 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 643 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=203, Invalid=1279, Unknown=0, NotChecked=0, Total=1482 [2022-02-24 03:57:17,147 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 90 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 2295 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 91 SdHoareTripleChecker+Valid, 60 SdHoareTripleChecker+Invalid, 2316 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 2295 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-02-24 03:57:17,147 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [91 Valid, 60 Invalid, 2316 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 2295 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2022-02-24 03:57:17,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 415 states. [2022-02-24 03:57:18,267 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 415 to 342. [2022-02-24 03:57:18,267 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 342 states, 332 states have (on average 1.1867469879518073) internal successors, (394), 333 states have internal predecessors, (394), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:57:18,268 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 342 states to 342 states and 405 transitions. [2022-02-24 03:57:18,268 INFO L78 Accepts]: Start accepts. Automaton has 342 states and 405 transitions. Word has length 70 [2022-02-24 03:57:18,268 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:57:18,268 INFO L470 AbstractCegarLoop]: Abstraction has 342 states and 405 transitions. [2022-02-24 03:57:18,268 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.8285714285714285) internal successors, (64), 34 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:57:18,268 INFO L276 IsEmpty]: Start isEmpty. Operand 342 states and 405 transitions. [2022-02-24 03:57:18,268 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2022-02-24 03:57:18,268 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:57:18,268 INFO L514 BasicCegarLoop]: trace histogram [16, 16, 13, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:57:18,268 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable153 [2022-02-24 03:57:18,269 INFO L402 AbstractCegarLoop]: === Iteration 155 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:57:18,269 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:57:18,269 INFO L85 PathProgramCache]: Analyzing trace with hash -1394137764, now seen corresponding path program 118 times [2022-02-24 03:57:18,269 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:57:18,269 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1120502974] [2022-02-24 03:57:18,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:57:18,269 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:57:18,407 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:57:18,545 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:57:18,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:57:18,646 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:57:18,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:57:18,649 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:57:18,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:57:18,650 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 03:57:19,819 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:57:19,819 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1120502974] [2022-02-24 03:57:19,819 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1120502974] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:57:19,819 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:57:19,819 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [36] imperfect sequences [] total 36 [2022-02-24 03:57:19,819 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2122720752] [2022-02-24 03:57:19,819 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:57:19,819 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-02-24 03:57:19,819 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:57:19,819 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-02-24 03:57:19,820 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=1229, Unknown=0, NotChecked=0, Total=1406 [2022-02-24 03:57:19,820 INFO L87 Difference]: Start difference. First operand 342 states and 405 transitions. Second operand has 36 states, 36 states have (on average 1.7777777777777777) internal successors, (64), 35 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:57:22,586 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:57:22,587 INFO L93 Difference]: Finished difference Result 739 states and 868 transitions. [2022-02-24 03:57:22,587 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-02-24 03:57:22,587 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 1.7777777777777777) internal successors, (64), 35 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 70 [2022-02-24 03:57:22,587 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:57:22,588 INFO L225 Difference]: With dead ends: 739 [2022-02-24 03:57:22,588 INFO L226 Difference]: Without dead ends: 409 [2022-02-24 03:57:22,588 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 14 SyntacticMatches, 19 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 625 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=213, Invalid=1347, Unknown=0, NotChecked=0, Total=1560 [2022-02-24 03:57:22,589 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 104 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 1900 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 105 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 1922 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 1900 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-02-24 03:57:22,589 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [105 Valid, 42 Invalid, 1922 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 1900 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-02-24 03:57:22,589 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 409 states. [2022-02-24 03:57:23,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 409 to 342. [2022-02-24 03:57:23,747 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 342 states, 332 states have (on average 1.1867469879518073) internal successors, (394), 333 states have internal predecessors, (394), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:57:23,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 342 states to 342 states and 405 transitions. [2022-02-24 03:57:23,747 INFO L78 Accepts]: Start accepts. Automaton has 342 states and 405 transitions. Word has length 70 [2022-02-24 03:57:23,747 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:57:23,748 INFO L470 AbstractCegarLoop]: Abstraction has 342 states and 405 transitions. [2022-02-24 03:57:23,748 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 1.7777777777777777) internal successors, (64), 35 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:57:23,748 INFO L276 IsEmpty]: Start isEmpty. Operand 342 states and 405 transitions. [2022-02-24 03:57:23,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2022-02-24 03:57:23,748 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:57:23,748 INFO L514 BasicCegarLoop]: trace histogram [16, 16, 14, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:57:23,748 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable154 [2022-02-24 03:57:23,748 INFO L402 AbstractCegarLoop]: === Iteration 156 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:57:23,748 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:57:23,748 INFO L85 PathProgramCache]: Analyzing trace with hash 1312481630, now seen corresponding path program 119 times [2022-02-24 03:57:23,748 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:57:23,748 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [318143630] [2022-02-24 03:57:23,748 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:57:23,749 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:57:23,896 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:57:24,052 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:57:24,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:57:24,175 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:57:24,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:57:24,178 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:57:24,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:57:24,179 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 03:57:25,486 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:57:25,486 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [318143630] [2022-02-24 03:57:25,486 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [318143630] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:57:25,486 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:57:25,486 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [37] imperfect sequences [] total 37 [2022-02-24 03:57:25,487 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1254260810] [2022-02-24 03:57:25,487 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:57:25,487 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2022-02-24 03:57:25,487 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:57:25,487 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2022-02-24 03:57:25,487 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=1297, Unknown=0, NotChecked=0, Total=1482 [2022-02-24 03:57:25,487 INFO L87 Difference]: Start difference. First operand 342 states and 405 transitions. Second operand has 37 states, 37 states have (on average 1.7297297297297298) internal successors, (64), 36 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:57:28,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:57:28,128 INFO L93 Difference]: Finished difference Result 733 states and 862 transitions. [2022-02-24 03:57:28,129 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-02-24 03:57:28,129 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 1.7297297297297298) internal successors, (64), 36 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 70 [2022-02-24 03:57:28,129 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:57:28,129 INFO L225 Difference]: With dead ends: 733 [2022-02-24 03:57:28,129 INFO L226 Difference]: Without dead ends: 403 [2022-02-24 03:57:28,130 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 14 SyntacticMatches, 18 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 598 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=223, Invalid=1417, Unknown=0, NotChecked=0, Total=1640 [2022-02-24 03:57:28,130 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 107 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 1639 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 108 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 1662 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 1639 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-02-24 03:57:28,130 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [108 Valid, 33 Invalid, 1662 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 1639 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-02-24 03:57:28,130 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 403 states. [2022-02-24 03:57:29,240 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 403 to 342. [2022-02-24 03:57:29,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 342 states, 332 states have (on average 1.1867469879518073) internal successors, (394), 333 states have internal predecessors, (394), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:57:29,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 342 states to 342 states and 405 transitions. [2022-02-24 03:57:29,241 INFO L78 Accepts]: Start accepts. Automaton has 342 states and 405 transitions. Word has length 70 [2022-02-24 03:57:29,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:57:29,241 INFO L470 AbstractCegarLoop]: Abstraction has 342 states and 405 transitions. [2022-02-24 03:57:29,241 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 1.7297297297297298) internal successors, (64), 36 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:57:29,241 INFO L276 IsEmpty]: Start isEmpty. Operand 342 states and 405 transitions. [2022-02-24 03:57:29,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2022-02-24 03:57:29,241 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:57:29,241 INFO L514 BasicCegarLoop]: trace histogram [16, 16, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:57:29,242 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable155 [2022-02-24 03:57:29,242 INFO L402 AbstractCegarLoop]: === Iteration 157 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:57:29,242 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:57:29,242 INFO L85 PathProgramCache]: Analyzing trace with hash 301364380, now seen corresponding path program 120 times [2022-02-24 03:57:29,242 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:57:29,242 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [987691745] [2022-02-24 03:57:29,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:57:29,242 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:57:29,291 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:57:29,431 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:57:29,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:57:29,540 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:57:29,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:57:29,543 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:57:29,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:57:29,544 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 03:57:30,736 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:57:30,736 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [987691745] [2022-02-24 03:57:30,736 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [987691745] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:57:30,736 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:57:30,736 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [38] imperfect sequences [] total 38 [2022-02-24 03:57:30,736 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [740668595] [2022-02-24 03:57:30,736 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:57:30,736 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-02-24 03:57:30,737 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:57:30,737 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-02-24 03:57:30,737 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=1367, Unknown=0, NotChecked=0, Total=1560 [2022-02-24 03:57:30,737 INFO L87 Difference]: Start difference. First operand 342 states and 405 transitions. Second operand has 38 states, 38 states have (on average 1.6842105263157894) internal successors, (64), 37 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:57:33,909 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:57:33,909 INFO L93 Difference]: Finished difference Result 733 states and 865 transitions. [2022-02-24 03:57:33,910 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2022-02-24 03:57:33,910 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.6842105263157894) internal successors, (64), 37 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 70 [2022-02-24 03:57:33,910 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:57:33,910 INFO L225 Difference]: With dead ends: 733 [2022-02-24 03:57:33,910 INFO L226 Difference]: Without dead ends: 403 [2022-02-24 03:57:33,911 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 14 SyntacticMatches, 17 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 562 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=233, Invalid=1489, Unknown=0, NotChecked=0, Total=1722 [2022-02-24 03:57:33,911 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 93 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 2787 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 94 SdHoareTripleChecker+Valid, 68 SdHoareTripleChecker+Invalid, 2811 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 2787 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-02-24 03:57:33,911 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [94 Valid, 68 Invalid, 2811 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 2787 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2022-02-24 03:57:33,911 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 403 states. [2022-02-24 03:57:35,006 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 403 to 345. [2022-02-24 03:57:35,007 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 345 states, 335 states have (on average 1.1940298507462686) internal successors, (400), 336 states have internal predecessors, (400), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:57:35,007 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 345 states to 345 states and 411 transitions. [2022-02-24 03:57:35,007 INFO L78 Accepts]: Start accepts. Automaton has 345 states and 411 transitions. Word has length 70 [2022-02-24 03:57:35,008 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:57:35,008 INFO L470 AbstractCegarLoop]: Abstraction has 345 states and 411 transitions. [2022-02-24 03:57:35,008 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 1.6842105263157894) internal successors, (64), 37 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:57:35,008 INFO L276 IsEmpty]: Start isEmpty. Operand 345 states and 411 transitions. [2022-02-24 03:57:35,008 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2022-02-24 03:57:35,008 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:57:35,008 INFO L514 BasicCegarLoop]: trace histogram [16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:57:35,008 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable156 [2022-02-24 03:57:35,008 INFO L402 AbstractCegarLoop]: === Iteration 158 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:57:35,008 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:57:35,008 INFO L85 PathProgramCache]: Analyzing trace with hash 135824030, now seen corresponding path program 16 times [2022-02-24 03:57:35,009 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:57:35,009 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1142558050] [2022-02-24 03:57:35,009 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:57:35,009 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:57:35,064 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:57:35,108 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:57:35,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:57:35,156 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:57:35,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:57:35,159 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:57:35,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:57:35,160 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 03:57:36,147 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:57:36,148 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1142558050] [2022-02-24 03:57:36,148 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1142558050] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:57:36,148 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:57:36,148 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [37] imperfect sequences [] total 37 [2022-02-24 03:57:36,148 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2065570347] [2022-02-24 03:57:36,148 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:57:36,148 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2022-02-24 03:57:36,148 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:57:36,148 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2022-02-24 03:57:36,148 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=1282, Unknown=0, NotChecked=0, Total=1406 [2022-02-24 03:57:36,148 INFO L87 Difference]: Start difference. First operand 345 states and 411 transitions. Second operand has 37 states, 37 states have (on average 1.7297297297297298) internal successors, (64), 36 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:57:39,415 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:57:39,416 INFO L93 Difference]: Finished difference Result 739 states and 877 transitions. [2022-02-24 03:57:39,418 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-02-24 03:57:39,418 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 1.7297297297297298) internal successors, (64), 36 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 70 [2022-02-24 03:57:39,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:57:39,419 INFO L225 Difference]: With dead ends: 739 [2022-02-24 03:57:39,419 INFO L226 Difference]: Without dead ends: 406 [2022-02-24 03:57:39,419 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 13 SyntacticMatches, 17 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 444 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=128, Invalid=1354, Unknown=0, NotChecked=0, Total=1482 [2022-02-24 03:57:39,419 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 71 mSDsluCounter, 51 mSDsCounter, 0 mSdLazyCounter, 3102 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 72 SdHoareTripleChecker+Invalid, 3107 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 3102 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2022-02-24 03:57:39,419 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [72 Valid, 72 Invalid, 3107 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 3102 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2022-02-24 03:57:39,420 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 406 states. [2022-02-24 03:57:40,516 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 406 to 351. [2022-02-24 03:57:40,517 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 351 states, 341 states have (on average 1.1906158357771262) internal successors, (406), 342 states have internal predecessors, (406), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:57:40,517 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 351 states to 351 states and 417 transitions. [2022-02-24 03:57:40,517 INFO L78 Accepts]: Start accepts. Automaton has 351 states and 417 transitions. Word has length 70 [2022-02-24 03:57:40,517 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:57:40,517 INFO L470 AbstractCegarLoop]: Abstraction has 351 states and 417 transitions. [2022-02-24 03:57:40,518 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 1.7297297297297298) internal successors, (64), 36 states have internal predecessors, (64), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:57:40,518 INFO L276 IsEmpty]: Start isEmpty. Operand 351 states and 417 transitions. [2022-02-24 03:57:40,518 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-02-24 03:57:40,518 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:57:40,518 INFO L514 BasicCegarLoop]: trace histogram [17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:57:40,518 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable157 [2022-02-24 03:57:40,518 INFO L402 AbstractCegarLoop]: === Iteration 159 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:57:40,518 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:57:40,518 INFO L85 PathProgramCache]: Analyzing trace with hash -565732323, now seen corresponding path program 17 times [2022-02-24 03:57:40,518 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:57:40,518 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1098468422] [2022-02-24 03:57:40,518 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:57:40,519 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:57:40,612 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:57:40,707 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:57:40,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:57:40,743 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:57:40,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:57:40,745 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:57:40,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:57:40,746 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 03:57:41,568 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:57:41,568 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1098468422] [2022-02-24 03:57:41,568 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1098468422] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:57:41,568 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:57:41,568 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [24] imperfect sequences [] total 24 [2022-02-24 03:57:41,568 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [671360709] [2022-02-24 03:57:41,568 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:57:41,568 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-02-24 03:57:41,569 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:57:41,569 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-02-24 03:57:41,569 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=513, Unknown=0, NotChecked=0, Total=600 [2022-02-24 03:57:41,569 INFO L87 Difference]: Start difference. First operand 351 states and 417 transitions. Second operand has 24 states, 24 states have (on average 2.7916666666666665) internal successors, (67), 23 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:57:44,427 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:57:44,427 INFO L93 Difference]: Finished difference Result 838 states and 973 transitions. [2022-02-24 03:57:44,427 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-02-24 03:57:44,427 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.7916666666666665) internal successors, (67), 23 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 73 [2022-02-24 03:57:44,427 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:57:44,428 INFO L225 Difference]: With dead ends: 838 [2022-02-24 03:57:44,428 INFO L226 Difference]: Without dead ends: 499 [2022-02-24 03:57:44,428 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 15 SyntacticMatches, 34 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=91, Invalid=559, Unknown=0, NotChecked=0, Total=650 [2022-02-24 03:57:44,428 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 37 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 1617 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 1627 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1617 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-02-24 03:57:44,428 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 58 Invalid, 1627 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 1617 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-02-24 03:57:44,429 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 499 states. [2022-02-24 03:57:45,691 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 499 to 360. [2022-02-24 03:57:45,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 360 states, 350 states have (on average 1.1857142857142857) internal successors, (415), 351 states have internal predecessors, (415), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:57:45,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 360 states to 360 states and 426 transitions. [2022-02-24 03:57:45,692 INFO L78 Accepts]: Start accepts. Automaton has 360 states and 426 transitions. Word has length 73 [2022-02-24 03:57:45,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:57:45,692 INFO L470 AbstractCegarLoop]: Abstraction has 360 states and 426 transitions. [2022-02-24 03:57:45,692 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 2.7916666666666665) internal successors, (67), 23 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:57:45,692 INFO L276 IsEmpty]: Start isEmpty. Operand 360 states and 426 transitions. [2022-02-24 03:57:45,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-02-24 03:57:45,692 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:57:45,692 INFO L514 BasicCegarLoop]: trace histogram [17, 17, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:57:45,692 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable158 [2022-02-24 03:57:45,692 INFO L402 AbstractCegarLoop]: === Iteration 160 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:57:45,693 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:57:45,693 INFO L85 PathProgramCache]: Analyzing trace with hash -5032545, now seen corresponding path program 121 times [2022-02-24 03:57:45,693 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:57:45,693 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1898392866] [2022-02-24 03:57:45,693 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:57:45,693 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:57:45,838 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:57:45,990 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:57:45,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:57:46,100 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:57:46,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:57:46,102 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:57:46,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:57:46,107 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 03:57:47,186 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:57:47,186 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1898392866] [2022-02-24 03:57:47,186 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1898392866] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:57:47,186 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:57:47,186 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2022-02-24 03:57:47,186 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1671651597] [2022-02-24 03:57:47,186 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:57:47,186 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-02-24 03:57:47,186 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:57:47,187 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-02-24 03:57:47,187 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=618, Unknown=0, NotChecked=0, Total=702 [2022-02-24 03:57:47,187 INFO L87 Difference]: Start difference. First operand 360 states and 426 transitions. Second operand has 25 states, 25 states have (on average 2.68) internal successors, (67), 24 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:57:50,572 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:57:50,572 INFO L93 Difference]: Finished difference Result 856 states and 991 transitions. [2022-02-24 03:57:50,573 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-02-24 03:57:50,573 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.68) internal successors, (67), 24 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 73 [2022-02-24 03:57:50,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:57:50,573 INFO L225 Difference]: With dead ends: 856 [2022-02-24 03:57:50,573 INFO L226 Difference]: Without dead ends: 508 [2022-02-24 03:57:50,574 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 14 SyntacticMatches, 33 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 262 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=96, Invalid=716, Unknown=0, NotChecked=0, Total=812 [2022-02-24 03:57:50,574 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 41 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 1735 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 1745 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1735 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-02-24 03:57:50,574 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [42 Valid, 61 Invalid, 1745 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 1735 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-02-24 03:57:50,574 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 508 states. [2022-02-24 03:57:51,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 508 to 360. [2022-02-24 03:57:51,872 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 360 states, 350 states have (on average 1.1857142857142857) internal successors, (415), 351 states have internal predecessors, (415), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:57:51,872 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 360 states to 360 states and 426 transitions. [2022-02-24 03:57:51,872 INFO L78 Accepts]: Start accepts. Automaton has 360 states and 426 transitions. Word has length 73 [2022-02-24 03:57:51,872 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:57:51,872 INFO L470 AbstractCegarLoop]: Abstraction has 360 states and 426 transitions. [2022-02-24 03:57:51,872 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 2.68) internal successors, (67), 24 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:57:51,872 INFO L276 IsEmpty]: Start isEmpty. Operand 360 states and 426 transitions. [2022-02-24 03:57:51,873 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-02-24 03:57:51,873 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:57:51,873 INFO L514 BasicCegarLoop]: trace histogram [17, 17, 15, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:57:51,873 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable159 [2022-02-24 03:57:51,873 INFO L402 AbstractCegarLoop]: === Iteration 161 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:57:51,873 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:57:51,873 INFO L85 PathProgramCache]: Analyzing trace with hash 35642205, now seen corresponding path program 122 times [2022-02-24 03:57:51,873 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:57:51,873 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1933219913] [2022-02-24 03:57:51,873 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:57:51,876 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:57:52,013 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:57:52,155 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:57:52,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:57:52,306 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:57:52,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:57:52,309 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:57:52,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:57:52,310 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 03:57:53,563 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:57:53,563 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1933219913] [2022-02-24 03:57:53,563 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1933219913] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:57:53,564 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:57:53,564 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2022-02-24 03:57:53,564 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [415801464] [2022-02-24 03:57:53,564 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:57:53,564 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-02-24 03:57:53,564 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:57:53,564 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-02-24 03:57:53,564 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=664, Unknown=0, NotChecked=0, Total=756 [2022-02-24 03:57:53,564 INFO L87 Difference]: Start difference. First operand 360 states and 426 transitions. Second operand has 26 states, 26 states have (on average 2.576923076923077) internal successors, (67), 25 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:57:57,048 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:57:57,048 INFO L93 Difference]: Finished difference Result 850 states and 985 transitions. [2022-02-24 03:57:57,050 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-02-24 03:57:57,050 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.576923076923077) internal successors, (67), 25 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 73 [2022-02-24 03:57:57,050 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:57:57,051 INFO L225 Difference]: With dead ends: 850 [2022-02-24 03:57:57,051 INFO L226 Difference]: Without dead ends: 502 [2022-02-24 03:57:57,051 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 14 SyntacticMatches, 32 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 349 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=106, Invalid=764, Unknown=0, NotChecked=0, Total=870 [2022-02-24 03:57:57,052 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 42 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 1697 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 65 SdHoareTripleChecker+Invalid, 1708 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 1697 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-02-24 03:57:57,052 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [43 Valid, 65 Invalid, 1708 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 1697 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-02-24 03:57:57,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 502 states. [2022-02-24 03:57:58,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 502 to 360. [2022-02-24 03:57:58,380 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 360 states, 350 states have (on average 1.1857142857142857) internal successors, (415), 351 states have internal predecessors, (415), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:57:58,380 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 360 states to 360 states and 426 transitions. [2022-02-24 03:57:58,380 INFO L78 Accepts]: Start accepts. Automaton has 360 states and 426 transitions. Word has length 73 [2022-02-24 03:57:58,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:57:58,380 INFO L470 AbstractCegarLoop]: Abstraction has 360 states and 426 transitions. [2022-02-24 03:57:58,380 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 2.576923076923077) internal successors, (67), 25 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:57:58,380 INFO L276 IsEmpty]: Start isEmpty. Operand 360 states and 426 transitions. [2022-02-24 03:57:58,380 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-02-24 03:57:58,380 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:57:58,381 INFO L514 BasicCegarLoop]: trace histogram [17, 17, 14, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:57:58,381 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable160 [2022-02-24 03:57:58,381 INFO L402 AbstractCegarLoop]: === Iteration 162 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:57:58,381 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:57:58,381 INFO L85 PathProgramCache]: Analyzing trace with hash 479542879, now seen corresponding path program 123 times [2022-02-24 03:57:58,381 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:57:58,381 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1461187453] [2022-02-24 03:57:58,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:57:58,381 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:57:58,522 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:57:58,662 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:57:58,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:57:58,795 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:57:58,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:57:58,798 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:57:58,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:57:58,799 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 03:57:59,898 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:57:59,898 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1461187453] [2022-02-24 03:57:59,898 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1461187453] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:57:59,898 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:57:59,898 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2022-02-24 03:57:59,898 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2034437166] [2022-02-24 03:57:59,898 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:57:59,899 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-02-24 03:57:59,899 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:57:59,901 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-02-24 03:57:59,901 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=712, Unknown=0, NotChecked=0, Total=812 [2022-02-24 03:57:59,901 INFO L87 Difference]: Start difference. First operand 360 states and 426 transitions. Second operand has 27 states, 27 states have (on average 2.4814814814814814) internal successors, (67), 26 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:58:03,378 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:58:03,379 INFO L93 Difference]: Finished difference Result 844 states and 979 transitions. [2022-02-24 03:58:03,379 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-02-24 03:58:03,379 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 2.4814814814814814) internal successors, (67), 26 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 73 [2022-02-24 03:58:03,379 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:58:03,379 INFO L225 Difference]: With dead ends: 844 [2022-02-24 03:58:03,380 INFO L226 Difference]: Without dead ends: 496 [2022-02-24 03:58:03,380 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 14 SyntacticMatches, 31 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 427 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=116, Invalid=814, Unknown=0, NotChecked=0, Total=930 [2022-02-24 03:58:03,380 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 51 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 1755 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 60 SdHoareTripleChecker+Invalid, 1767 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 1755 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-02-24 03:58:03,380 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [52 Valid, 60 Invalid, 1767 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 1755 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-02-24 03:58:03,380 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 496 states. [2022-02-24 03:58:04,720 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 496 to 360. [2022-02-24 03:58:04,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 360 states, 350 states have (on average 1.1857142857142857) internal successors, (415), 351 states have internal predecessors, (415), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:58:04,721 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 360 states to 360 states and 426 transitions. [2022-02-24 03:58:04,721 INFO L78 Accepts]: Start accepts. Automaton has 360 states and 426 transitions. Word has length 73 [2022-02-24 03:58:04,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:58:04,721 INFO L470 AbstractCegarLoop]: Abstraction has 360 states and 426 transitions. [2022-02-24 03:58:04,721 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 2.4814814814814814) internal successors, (67), 26 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:58:04,721 INFO L276 IsEmpty]: Start isEmpty. Operand 360 states and 426 transitions. [2022-02-24 03:58:04,721 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-02-24 03:58:04,721 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:58:04,721 INFO L514 BasicCegarLoop]: trace histogram [17, 17, 13, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:58:04,721 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable161 [2022-02-24 03:58:04,722 INFO L402 AbstractCegarLoop]: === Iteration 163 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:58:04,722 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:58:04,722 INFO L85 PathProgramCache]: Analyzing trace with hash -1537379, now seen corresponding path program 124 times [2022-02-24 03:58:04,722 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:58:04,722 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1021863580] [2022-02-24 03:58:04,722 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:58:04,722 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:58:04,863 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:58:05,018 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:58:05,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:58:05,134 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:58:05,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:58:05,136 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:58:05,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:58:05,138 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 03:58:06,274 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:58:06,274 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1021863580] [2022-02-24 03:58:06,275 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1021863580] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:58:06,275 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:58:06,275 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [] total 28 [2022-02-24 03:58:06,275 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1121333409] [2022-02-24 03:58:06,275 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:58:06,275 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-02-24 03:58:06,275 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:58:06,275 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-02-24 03:58:06,276 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=762, Unknown=0, NotChecked=0, Total=870 [2022-02-24 03:58:06,276 INFO L87 Difference]: Start difference. First operand 360 states and 426 transitions. Second operand has 28 states, 28 states have (on average 2.392857142857143) internal successors, (67), 27 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:58:09,896 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:58:09,896 INFO L93 Difference]: Finished difference Result 838 states and 973 transitions. [2022-02-24 03:58:09,896 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-02-24 03:58:09,896 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 2.392857142857143) internal successors, (67), 27 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 73 [2022-02-24 03:58:09,896 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:58:09,897 INFO L225 Difference]: With dead ends: 838 [2022-02-24 03:58:09,897 INFO L226 Difference]: Without dead ends: 490 [2022-02-24 03:58:09,897 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 14 SyntacticMatches, 30 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 496 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=126, Invalid=866, Unknown=0, NotChecked=0, Total=992 [2022-02-24 03:58:09,897 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 59 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 1897 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 54 SdHoareTripleChecker+Invalid, 1910 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 1897 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-02-24 03:58:09,898 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [60 Valid, 54 Invalid, 1910 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 1897 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-02-24 03:58:09,898 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 490 states. [2022-02-24 03:58:11,315 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 490 to 360. [2022-02-24 03:58:11,316 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 360 states, 350 states have (on average 1.1857142857142857) internal successors, (415), 351 states have internal predecessors, (415), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:58:11,316 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 360 states to 360 states and 426 transitions. [2022-02-24 03:58:11,316 INFO L78 Accepts]: Start accepts. Automaton has 360 states and 426 transitions. Word has length 73 [2022-02-24 03:58:11,316 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:58:11,316 INFO L470 AbstractCegarLoop]: Abstraction has 360 states and 426 transitions. [2022-02-24 03:58:11,316 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 2.392857142857143) internal successors, (67), 27 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:58:11,316 INFO L276 IsEmpty]: Start isEmpty. Operand 360 states and 426 transitions. [2022-02-24 03:58:11,317 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-02-24 03:58:11,317 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:58:11,317 INFO L514 BasicCegarLoop]: trace histogram [17, 17, 12, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:58:11,317 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable162 [2022-02-24 03:58:11,317 INFO L402 AbstractCegarLoop]: === Iteration 164 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:58:11,317 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:58:11,317 INFO L85 PathProgramCache]: Analyzing trace with hash -354625761, now seen corresponding path program 125 times [2022-02-24 03:58:11,317 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:58:11,317 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1498747304] [2022-02-24 03:58:11,317 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:58:11,317 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:58:11,484 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:58:11,618 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:58:11,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:58:11,747 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:58:11,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:58:11,756 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:58:11,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:58:11,758 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 03:58:12,966 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:58:12,966 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1498747304] [2022-02-24 03:58:12,966 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1498747304] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:58:12,966 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:58:12,966 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2022-02-24 03:58:12,966 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1736649979] [2022-02-24 03:58:12,966 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:58:12,966 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-02-24 03:58:12,966 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:58:12,967 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-02-24 03:58:12,967 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=814, Unknown=0, NotChecked=0, Total=930 [2022-02-24 03:58:12,967 INFO L87 Difference]: Start difference. First operand 360 states and 426 transitions. Second operand has 29 states, 29 states have (on average 2.310344827586207) internal successors, (67), 28 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:58:16,457 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:58:16,457 INFO L93 Difference]: Finished difference Result 832 states and 967 transitions. [2022-02-24 03:58:16,458 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-02-24 03:58:16,458 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 2.310344827586207) internal successors, (67), 28 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 73 [2022-02-24 03:58:16,458 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:58:16,459 INFO L225 Difference]: With dead ends: 832 [2022-02-24 03:58:16,459 INFO L226 Difference]: Without dead ends: 484 [2022-02-24 03:58:16,459 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 14 SyntacticMatches, 29 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 556 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=136, Invalid=920, Unknown=0, NotChecked=0, Total=1056 [2022-02-24 03:58:16,459 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 60 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 1760 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 47 SdHoareTripleChecker+Invalid, 1774 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 1760 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-02-24 03:58:16,459 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [61 Valid, 47 Invalid, 1774 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 1760 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-02-24 03:58:16,460 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 484 states. [2022-02-24 03:58:17,857 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 484 to 360. [2022-02-24 03:58:17,857 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 360 states, 350 states have (on average 1.1857142857142857) internal successors, (415), 351 states have internal predecessors, (415), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:58:17,858 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 360 states to 360 states and 426 transitions. [2022-02-24 03:58:17,858 INFO L78 Accepts]: Start accepts. Automaton has 360 states and 426 transitions. Word has length 73 [2022-02-24 03:58:17,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:58:17,858 INFO L470 AbstractCegarLoop]: Abstraction has 360 states and 426 transitions. [2022-02-24 03:58:17,858 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 2.310344827586207) internal successors, (67), 28 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:58:17,858 INFO L276 IsEmpty]: Start isEmpty. Operand 360 states and 426 transitions. [2022-02-24 03:58:17,858 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-02-24 03:58:17,858 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:58:17,858 INFO L514 BasicCegarLoop]: trace histogram [17, 17, 11, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:58:17,858 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable163 [2022-02-24 03:58:17,859 INFO L402 AbstractCegarLoop]: === Iteration 165 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:58:17,859 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:58:17,859 INFO L85 PathProgramCache]: Analyzing trace with hash 1890953693, now seen corresponding path program 126 times [2022-02-24 03:58:17,859 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:58:17,859 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1083782519] [2022-02-24 03:58:17,859 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:58:17,859 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:58:18,044 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:58:18,209 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:58:18,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:58:18,351 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:58:18,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:58:18,354 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:58:18,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:58:18,356 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 03:58:19,606 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:58:19,606 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1083782519] [2022-02-24 03:58:19,606 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1083782519] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:58:19,606 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:58:19,606 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2022-02-24 03:58:19,606 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [40328260] [2022-02-24 03:58:19,606 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:58:19,607 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-02-24 03:58:19,607 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:58:19,607 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-02-24 03:58:19,607 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=868, Unknown=0, NotChecked=0, Total=992 [2022-02-24 03:58:19,607 INFO L87 Difference]: Start difference. First operand 360 states and 426 transitions. Second operand has 30 states, 30 states have (on average 2.2333333333333334) internal successors, (67), 29 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:58:23,067 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:58:23,068 INFO L93 Difference]: Finished difference Result 826 states and 961 transitions. [2022-02-24 03:58:23,068 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-02-24 03:58:23,068 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 2.2333333333333334) internal successors, (67), 29 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 73 [2022-02-24 03:58:23,068 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:58:23,069 INFO L225 Difference]: With dead ends: 826 [2022-02-24 03:58:23,069 INFO L226 Difference]: Without dead ends: 478 [2022-02-24 03:58:23,069 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 14 SyntacticMatches, 28 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 607 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=146, Invalid=976, Unknown=0, NotChecked=0, Total=1122 [2022-02-24 03:58:23,069 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 64 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 1984 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 1999 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 1984 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-02-24 03:58:23,069 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [65 Valid, 51 Invalid, 1999 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 1984 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-02-24 03:58:23,070 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 478 states. [2022-02-24 03:58:24,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 478 to 360. [2022-02-24 03:58:24,462 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 360 states, 350 states have (on average 1.1857142857142857) internal successors, (415), 351 states have internal predecessors, (415), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:58:24,463 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 360 states to 360 states and 426 transitions. [2022-02-24 03:58:24,463 INFO L78 Accepts]: Start accepts. Automaton has 360 states and 426 transitions. Word has length 73 [2022-02-24 03:58:24,463 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:58:24,463 INFO L470 AbstractCegarLoop]: Abstraction has 360 states and 426 transitions. [2022-02-24 03:58:24,463 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 2.2333333333333334) internal successors, (67), 29 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:58:24,463 INFO L276 IsEmpty]: Start isEmpty. Operand 360 states and 426 transitions. [2022-02-24 03:58:24,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-02-24 03:58:24,463 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:58:24,463 INFO L514 BasicCegarLoop]: trace histogram [17, 17, 10, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:58:24,463 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable164 [2022-02-24 03:58:24,464 INFO L402 AbstractCegarLoop]: === Iteration 166 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:58:24,464 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:58:24,464 INFO L85 PathProgramCache]: Analyzing trace with hash -1980366881, now seen corresponding path program 127 times [2022-02-24 03:58:24,464 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:58:24,464 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1233042991] [2022-02-24 03:58:24,464 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:58:24,464 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:58:24,607 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:58:24,754 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:58:24,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:58:24,878 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:58:24,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:58:24,881 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:58:24,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:58:24,882 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 03:58:26,146 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:58:26,146 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1233042991] [2022-02-24 03:58:26,146 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1233042991] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:58:26,146 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:58:26,146 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2022-02-24 03:58:26,146 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [127170022] [2022-02-24 03:58:26,146 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:58:26,146 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-02-24 03:58:26,146 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:58:26,147 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-02-24 03:58:26,147 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=924, Unknown=0, NotChecked=0, Total=1056 [2022-02-24 03:58:26,147 INFO L87 Difference]: Start difference. First operand 360 states and 426 transitions. Second operand has 31 states, 31 states have (on average 2.161290322580645) internal successors, (67), 30 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:58:29,705 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:58:29,705 INFO L93 Difference]: Finished difference Result 820 states and 955 transitions. [2022-02-24 03:58:29,705 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2022-02-24 03:58:29,705 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 2.161290322580645) internal successors, (67), 30 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 73 [2022-02-24 03:58:29,705 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:58:29,706 INFO L225 Difference]: With dead ends: 820 [2022-02-24 03:58:29,706 INFO L226 Difference]: Without dead ends: 472 [2022-02-24 03:58:29,706 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 14 SyntacticMatches, 27 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 649 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=156, Invalid=1034, Unknown=0, NotChecked=0, Total=1190 [2022-02-24 03:58:29,706 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 64 mSDsluCounter, 41 mSDsCounter, 0 mSdLazyCounter, 1906 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 1922 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 1906 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-02-24 03:58:29,707 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [65 Valid, 62 Invalid, 1922 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 1906 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-02-24 03:58:29,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 472 states. [2022-02-24 03:58:31,109 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 472 to 360. [2022-02-24 03:58:31,109 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 360 states, 350 states have (on average 1.1857142857142857) internal successors, (415), 351 states have internal predecessors, (415), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:58:31,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 360 states to 360 states and 426 transitions. [2022-02-24 03:58:31,110 INFO L78 Accepts]: Start accepts. Automaton has 360 states and 426 transitions. Word has length 73 [2022-02-24 03:58:31,110 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:58:31,110 INFO L470 AbstractCegarLoop]: Abstraction has 360 states and 426 transitions. [2022-02-24 03:58:31,110 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 2.161290322580645) internal successors, (67), 30 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:58:31,110 INFO L276 IsEmpty]: Start isEmpty. Operand 360 states and 426 transitions. [2022-02-24 03:58:31,110 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-02-24 03:58:31,110 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:58:31,110 INFO L514 BasicCegarLoop]: trace histogram [17, 17, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:58:31,110 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable165 [2022-02-24 03:58:31,111 INFO L402 AbstractCegarLoop]: === Iteration 167 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:58:31,111 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:58:31,111 INFO L85 PathProgramCache]: Analyzing trace with hash 1285241117, now seen corresponding path program 128 times [2022-02-24 03:58:31,111 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:58:31,111 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [849181068] [2022-02-24 03:58:31,111 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:58:31,111 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:58:31,251 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:58:31,392 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:58:31,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:58:31,510 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:58:31,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:58:31,512 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:58:31,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:58:31,513 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 03:58:32,889 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:58:32,889 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [849181068] [2022-02-24 03:58:32,889 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [849181068] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:58:32,889 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:58:32,889 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2022-02-24 03:58:32,889 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [167309951] [2022-02-24 03:58:32,889 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:58:32,890 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-02-24 03:58:32,890 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:58:32,890 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-02-24 03:58:32,890 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=982, Unknown=0, NotChecked=0, Total=1122 [2022-02-24 03:58:32,890 INFO L87 Difference]: Start difference. First operand 360 states and 426 transitions. Second operand has 32 states, 32 states have (on average 2.09375) internal successors, (67), 31 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:58:36,649 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:58:36,649 INFO L93 Difference]: Finished difference Result 814 states and 949 transitions. [2022-02-24 03:58:36,652 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-02-24 03:58:36,652 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 2.09375) internal successors, (67), 31 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 73 [2022-02-24 03:58:36,652 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:58:36,652 INFO L225 Difference]: With dead ends: 814 [2022-02-24 03:58:36,652 INFO L226 Difference]: Without dead ends: 466 [2022-02-24 03:58:36,653 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 14 SyntacticMatches, 26 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 682 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=166, Invalid=1094, Unknown=0, NotChecked=0, Total=1260 [2022-02-24 03:58:36,653 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 67 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 2209 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 68 SdHoareTripleChecker+Valid, 67 SdHoareTripleChecker+Invalid, 2226 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 2209 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2022-02-24 03:58:36,653 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [68 Valid, 67 Invalid, 2226 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 2209 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2022-02-24 03:58:36,653 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 466 states. [2022-02-24 03:58:38,050 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 466 to 360. [2022-02-24 03:58:38,050 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 360 states, 350 states have (on average 1.1857142857142857) internal successors, (415), 351 states have internal predecessors, (415), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:58:38,051 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 360 states to 360 states and 426 transitions. [2022-02-24 03:58:38,051 INFO L78 Accepts]: Start accepts. Automaton has 360 states and 426 transitions. Word has length 73 [2022-02-24 03:58:38,051 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:58:38,051 INFO L470 AbstractCegarLoop]: Abstraction has 360 states and 426 transitions. [2022-02-24 03:58:38,051 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 2.09375) internal successors, (67), 31 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:58:38,051 INFO L276 IsEmpty]: Start isEmpty. Operand 360 states and 426 transitions. [2022-02-24 03:58:38,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-02-24 03:58:38,051 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:58:38,051 INFO L514 BasicCegarLoop]: trace histogram [17, 17, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:58:38,051 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable166 [2022-02-24 03:58:38,051 INFO L402 AbstractCegarLoop]: === Iteration 168 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:58:38,051 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:58:38,052 INFO L85 PathProgramCache]: Analyzing trace with hash 441235615, now seen corresponding path program 129 times [2022-02-24 03:58:38,052 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:58:38,052 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1257672250] [2022-02-24 03:58:38,052 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:58:38,052 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:58:38,200 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:58:38,350 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:58:38,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:58:38,478 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:58:38,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:58:38,481 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:58:38,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:58:38,482 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 03:58:39,743 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:58:39,743 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1257672250] [2022-02-24 03:58:39,743 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1257672250] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:58:39,743 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:58:39,743 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2022-02-24 03:58:39,744 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1651044453] [2022-02-24 03:58:39,744 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:58:39,744 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-02-24 03:58:39,744 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:58:39,744 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-02-24 03:58:39,744 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=148, Invalid=1042, Unknown=0, NotChecked=0, Total=1190 [2022-02-24 03:58:39,744 INFO L87 Difference]: Start difference. First operand 360 states and 426 transitions. Second operand has 33 states, 33 states have (on average 2.0303030303030303) internal successors, (67), 32 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:58:43,462 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:58:43,462 INFO L93 Difference]: Finished difference Result 808 states and 943 transitions. [2022-02-24 03:58:43,462 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-02-24 03:58:43,462 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 2.0303030303030303) internal successors, (67), 32 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 73 [2022-02-24 03:58:43,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:58:43,463 INFO L225 Difference]: With dead ends: 808 [2022-02-24 03:58:43,463 INFO L226 Difference]: Without dead ends: 460 [2022-02-24 03:58:43,463 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 14 SyntacticMatches, 25 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 706 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=176, Invalid=1156, Unknown=0, NotChecked=0, Total=1332 [2022-02-24 03:58:43,463 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 76 mSDsluCounter, 38 mSDsCounter, 0 mSdLazyCounter, 2265 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 77 SdHoareTripleChecker+Valid, 59 SdHoareTripleChecker+Invalid, 2283 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 2265 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2022-02-24 03:58:43,463 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [77 Valid, 59 Invalid, 2283 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 2265 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2022-02-24 03:58:43,464 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 460 states. [2022-02-24 03:58:44,903 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 460 to 360. [2022-02-24 03:58:44,903 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 360 states, 350 states have (on average 1.1857142857142857) internal successors, (415), 351 states have internal predecessors, (415), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:58:44,903 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 360 states to 360 states and 426 transitions. [2022-02-24 03:58:44,904 INFO L78 Accepts]: Start accepts. Automaton has 360 states and 426 transitions. Word has length 73 [2022-02-24 03:58:44,904 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:58:44,904 INFO L470 AbstractCegarLoop]: Abstraction has 360 states and 426 transitions. [2022-02-24 03:58:44,904 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 2.0303030303030303) internal successors, (67), 32 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:58:44,904 INFO L276 IsEmpty]: Start isEmpty. Operand 360 states and 426 transitions. [2022-02-24 03:58:44,904 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-02-24 03:58:44,904 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:58:44,904 INFO L514 BasicCegarLoop]: trace histogram [17, 17, 10, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:58:44,904 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable167 [2022-02-24 03:58:44,904 INFO L402 AbstractCegarLoop]: === Iteration 169 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:58:44,904 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:58:44,904 INFO L85 PathProgramCache]: Analyzing trace with hash 715995229, now seen corresponding path program 130 times [2022-02-24 03:58:44,904 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:58:44,905 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [44021346] [2022-02-24 03:58:44,905 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:58:44,905 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:58:45,057 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:58:45,211 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:58:45,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:58:45,322 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:58:45,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:58:45,325 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:58:45,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:58:45,326 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 03:58:46,637 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:58:46,637 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [44021346] [2022-02-24 03:58:46,637 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [44021346] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:58:46,637 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:58:46,637 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [34] imperfect sequences [] total 34 [2022-02-24 03:58:46,637 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1082445571] [2022-02-24 03:58:46,637 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:58:46,637 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2022-02-24 03:58:46,637 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:58:46,638 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2022-02-24 03:58:46,638 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=156, Invalid=1104, Unknown=0, NotChecked=0, Total=1260 [2022-02-24 03:58:46,638 INFO L87 Difference]: Start difference. First operand 360 states and 426 transitions. Second operand has 34 states, 34 states have (on average 1.9705882352941178) internal successors, (67), 33 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:58:50,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:58:50,096 INFO L93 Difference]: Finished difference Result 802 states and 937 transitions. [2022-02-24 03:58:50,110 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-02-24 03:58:50,110 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 1.9705882352941178) internal successors, (67), 33 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 73 [2022-02-24 03:58:50,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:58:50,111 INFO L225 Difference]: With dead ends: 802 [2022-02-24 03:58:50,111 INFO L226 Difference]: Without dead ends: 454 [2022-02-24 03:58:50,111 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 14 SyntacticMatches, 24 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 721 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=186, Invalid=1220, Unknown=0, NotChecked=0, Total=1406 [2022-02-24 03:58:50,111 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 96 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 1795 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 97 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 1814 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 1795 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-02-24 03:58:50,111 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [97 Valid, 39 Invalid, 1814 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 1795 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-02-24 03:58:50,112 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 454 states. [2022-02-24 03:58:51,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 454 to 360. [2022-02-24 03:58:51,564 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 360 states, 350 states have (on average 1.1857142857142857) internal successors, (415), 351 states have internal predecessors, (415), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:58:51,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 360 states to 360 states and 426 transitions. [2022-02-24 03:58:51,564 INFO L78 Accepts]: Start accepts. Automaton has 360 states and 426 transitions. Word has length 73 [2022-02-24 03:58:51,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:58:51,564 INFO L470 AbstractCegarLoop]: Abstraction has 360 states and 426 transitions. [2022-02-24 03:58:51,564 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 1.9705882352941178) internal successors, (67), 33 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:58:51,564 INFO L276 IsEmpty]: Start isEmpty. Operand 360 states and 426 transitions. [2022-02-24 03:58:51,565 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-02-24 03:58:51,565 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:58:51,565 INFO L514 BasicCegarLoop]: trace histogram [17, 17, 11, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:58:51,565 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable168 [2022-02-24 03:58:51,565 INFO L402 AbstractCegarLoop]: === Iteration 170 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:58:51,565 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:58:51,565 INFO L85 PathProgramCache]: Analyzing trace with hash 2102198623, now seen corresponding path program 131 times [2022-02-24 03:58:51,565 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:58:51,565 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [875715892] [2022-02-24 03:58:51,565 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:58:51,565 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:58:51,714 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:58:51,883 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:58:51,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:58:52,023 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:58:52,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:58:52,026 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:58:52,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:58:52,028 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 03:58:53,659 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:58:53,659 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [875715892] [2022-02-24 03:58:53,659 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [875715892] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:58:53,659 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:58:53,659 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2022-02-24 03:58:53,659 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [878756172] [2022-02-24 03:58:53,659 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:58:53,659 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-02-24 03:58:53,659 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:58:53,660 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-02-24 03:58:53,660 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=164, Invalid=1168, Unknown=0, NotChecked=0, Total=1332 [2022-02-24 03:58:53,660 INFO L87 Difference]: Start difference. First operand 360 states and 426 transitions. Second operand has 35 states, 35 states have (on average 1.9142857142857144) internal successors, (67), 34 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:58:57,444 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:58:57,444 INFO L93 Difference]: Finished difference Result 796 states and 931 transitions. [2022-02-24 03:58:57,446 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-02-24 03:58:57,447 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.9142857142857144) internal successors, (67), 34 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 73 [2022-02-24 03:58:57,447 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:58:57,447 INFO L225 Difference]: With dead ends: 796 [2022-02-24 03:58:57,447 INFO L226 Difference]: Without dead ends: 448 [2022-02-24 03:58:57,448 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 14 SyntacticMatches, 23 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 727 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=196, Invalid=1286, Unknown=0, NotChecked=0, Total=1482 [2022-02-24 03:58:57,448 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 95 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 2285 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 96 SdHoareTripleChecker+Valid, 47 SdHoareTripleChecker+Invalid, 2305 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 2285 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-02-24 03:58:57,448 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [96 Valid, 47 Invalid, 2305 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 2285 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2022-02-24 03:58:57,448 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 448 states. [2022-02-24 03:58:58,923 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 448 to 360. [2022-02-24 03:58:58,923 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 360 states, 350 states have (on average 1.1857142857142857) internal successors, (415), 351 states have internal predecessors, (415), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:58:58,924 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 360 states to 360 states and 426 transitions. [2022-02-24 03:58:58,924 INFO L78 Accepts]: Start accepts. Automaton has 360 states and 426 transitions. Word has length 73 [2022-02-24 03:58:58,924 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:58:58,924 INFO L470 AbstractCegarLoop]: Abstraction has 360 states and 426 transitions. [2022-02-24 03:58:58,924 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.9142857142857144) internal successors, (67), 34 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:58:58,924 INFO L276 IsEmpty]: Start isEmpty. Operand 360 states and 426 transitions. [2022-02-24 03:58:58,924 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-02-24 03:58:58,924 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:58:58,924 INFO L514 BasicCegarLoop]: trace histogram [17, 17, 12, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:58:58,924 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable169 [2022-02-24 03:58:58,924 INFO L402 AbstractCegarLoop]: === Iteration 171 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:58:58,925 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:58:58,925 INFO L85 PathProgramCache]: Analyzing trace with hash -2130729059, now seen corresponding path program 132 times [2022-02-24 03:58:58,925 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:58:58,925 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1493648997] [2022-02-24 03:58:58,925 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:58:58,925 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:58:59,080 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:58:59,228 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:58:59,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:58:59,340 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:58:59,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:58:59,350 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:58:59,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:58:59,352 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 03:59:00,691 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:59:00,692 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1493648997] [2022-02-24 03:59:00,692 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1493648997] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:59:00,692 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:59:00,692 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [36] imperfect sequences [] total 36 [2022-02-24 03:59:00,692 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [604128060] [2022-02-24 03:59:00,692 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:59:00,692 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-02-24 03:59:00,693 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:59:00,693 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-02-24 03:59:00,693 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=172, Invalid=1234, Unknown=0, NotChecked=0, Total=1406 [2022-02-24 03:59:00,693 INFO L87 Difference]: Start difference. First operand 360 states and 426 transitions. Second operand has 36 states, 36 states have (on average 1.8611111111111112) internal successors, (67), 35 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:59:04,606 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:59:04,606 INFO L93 Difference]: Finished difference Result 790 states and 925 transitions. [2022-02-24 03:59:04,607 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-02-24 03:59:04,607 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 1.8611111111111112) internal successors, (67), 35 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 73 [2022-02-24 03:59:04,607 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:59:04,607 INFO L225 Difference]: With dead ends: 790 [2022-02-24 03:59:04,607 INFO L226 Difference]: Without dead ends: 442 [2022-02-24 03:59:04,608 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 14 SyntacticMatches, 22 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 724 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=206, Invalid=1354, Unknown=0, NotChecked=0, Total=1560 [2022-02-24 03:59:04,608 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 80 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 2489 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 81 SdHoareTripleChecker+Valid, 67 SdHoareTripleChecker+Invalid, 2510 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 2489 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2022-02-24 03:59:04,608 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [81 Valid, 67 Invalid, 2510 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 2489 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2022-02-24 03:59:04,608 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 442 states. [2022-02-24 03:59:06,083 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 442 to 360. [2022-02-24 03:59:06,084 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 360 states, 350 states have (on average 1.1857142857142857) internal successors, (415), 351 states have internal predecessors, (415), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:59:06,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 360 states to 360 states and 426 transitions. [2022-02-24 03:59:06,084 INFO L78 Accepts]: Start accepts. Automaton has 360 states and 426 transitions. Word has length 73 [2022-02-24 03:59:06,084 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:59:06,084 INFO L470 AbstractCegarLoop]: Abstraction has 360 states and 426 transitions. [2022-02-24 03:59:06,085 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 1.8611111111111112) internal successors, (67), 35 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:59:06,085 INFO L276 IsEmpty]: Start isEmpty. Operand 360 states and 426 transitions. [2022-02-24 03:59:06,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-02-24 03:59:06,085 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:59:06,085 INFO L514 BasicCegarLoop]: trace histogram [17, 17, 13, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:59:06,085 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable170 [2022-02-24 03:59:06,085 INFO L402 AbstractCegarLoop]: === Iteration 172 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:59:06,085 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:59:06,085 INFO L85 PathProgramCache]: Analyzing trace with hash 358799903, now seen corresponding path program 133 times [2022-02-24 03:59:06,085 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:59:06,085 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [648923054] [2022-02-24 03:59:06,085 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:59:06,086 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:59:06,238 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:59:06,396 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:59:06,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:59:06,518 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:59:06,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:59:06,521 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:59:06,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:59:06,523 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-24 03:59:08,154 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:59:08,155 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [648923054] [2022-02-24 03:59:08,155 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [648923054] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:59:08,155 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:59:08,155 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [37] imperfect sequences [] total 37 [2022-02-24 03:59:08,155 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1819453086] [2022-02-24 03:59:08,155 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:59:08,155 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2022-02-24 03:59:08,155 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:59:08,155 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2022-02-24 03:59:08,155 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=180, Invalid=1302, Unknown=0, NotChecked=0, Total=1482 [2022-02-24 03:59:08,156 INFO L87 Difference]: Start difference. First operand 360 states and 426 transitions. Second operand has 37 states, 37 states have (on average 1.8108108108108107) internal successors, (67), 36 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:59:12,073 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:59:12,074 INFO L93 Difference]: Finished difference Result 784 states and 919 transitions. [2022-02-24 03:59:12,076 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-02-24 03:59:12,076 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 1.8108108108108107) internal successors, (67), 36 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 73 [2022-02-24 03:59:12,076 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:59:12,077 INFO L225 Difference]: With dead ends: 784 [2022-02-24 03:59:12,077 INFO L226 Difference]: Without dead ends: 436 [2022-02-24 03:59:12,077 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 14 SyntacticMatches, 21 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 712 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=216, Invalid=1424, Unknown=0, NotChecked=0, Total=1640 [2022-02-24 03:59:12,078 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 90 mSDsluCounter, 43 mSDsCounter, 0 mSdLazyCounter, 2479 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 91 SdHoareTripleChecker+Valid, 64 SdHoareTripleChecker+Invalid, 2501 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 2479 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2022-02-24 03:59:12,078 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [91 Valid, 64 Invalid, 2501 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 2479 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2022-02-24 03:59:12,078 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 436 states. [2022-02-24 03:59:13,477 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 436 to 360. [2022-02-24 03:59:13,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 360 states, 350 states have (on average 1.1857142857142857) internal successors, (415), 351 states have internal predecessors, (415), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:59:13,477 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 360 states to 360 states and 426 transitions. [2022-02-24 03:59:13,477 INFO L78 Accepts]: Start accepts. Automaton has 360 states and 426 transitions. Word has length 73 [2022-02-24 03:59:13,478 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:59:13,478 INFO L470 AbstractCegarLoop]: Abstraction has 360 states and 426 transitions. [2022-02-24 03:59:13,478 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 1.8108108108108107) internal successors, (67), 36 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:59:13,478 INFO L276 IsEmpty]: Start isEmpty. Operand 360 states and 426 transitions. [2022-02-24 03:59:13,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-02-24 03:59:13,478 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:59:13,478 INFO L514 BasicCegarLoop]: trace histogram [17, 17, 14, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:59:13,478 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable171 [2022-02-24 03:59:13,478 INFO L402 AbstractCegarLoop]: === Iteration 173 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:59:13,478 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:59:13,478 INFO L85 PathProgramCache]: Analyzing trace with hash -458848547, now seen corresponding path program 134 times [2022-02-24 03:59:13,478 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:59:13,479 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1015670583] [2022-02-24 03:59:13,479 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:59:13,479 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:59:13,625 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:59:13,768 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:59:13,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:59:13,921 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:59:13,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:59:13,924 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:59:13,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:59:13,925 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 03:59:15,442 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:59:15,442 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1015670583] [2022-02-24 03:59:15,442 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1015670583] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:59:15,442 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:59:15,442 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [38] imperfect sequences [] total 38 [2022-02-24 03:59:15,442 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [272073711] [2022-02-24 03:59:15,442 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:59:15,442 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-02-24 03:59:15,442 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:59:15,443 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-02-24 03:59:15,443 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=188, Invalid=1372, Unknown=0, NotChecked=0, Total=1560 [2022-02-24 03:59:15,443 INFO L87 Difference]: Start difference. First operand 360 states and 426 transitions. Second operand has 38 states, 38 states have (on average 1.763157894736842) internal successors, (67), 37 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:59:19,649 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:59:19,650 INFO L93 Difference]: Finished difference Result 778 states and 913 transitions. [2022-02-24 03:59:19,652 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2022-02-24 03:59:19,652 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.763157894736842) internal successors, (67), 37 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 73 [2022-02-24 03:59:19,652 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:59:19,653 INFO L225 Difference]: With dead ends: 778 [2022-02-24 03:59:19,653 INFO L226 Difference]: Without dead ends: 430 [2022-02-24 03:59:19,653 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 14 SyntacticMatches, 20 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 691 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=226, Invalid=1496, Unknown=0, NotChecked=0, Total=1722 [2022-02-24 03:59:19,654 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 97 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 3072 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 98 SdHoareTripleChecker+Valid, 68 SdHoareTripleChecker+Invalid, 3095 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 3072 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2022-02-24 03:59:19,654 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [98 Valid, 68 Invalid, 3095 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 3072 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2022-02-24 03:59:19,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 430 states. [2022-02-24 03:59:21,065 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 430 to 360. [2022-02-24 03:59:21,065 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 360 states, 350 states have (on average 1.1857142857142857) internal successors, (415), 351 states have internal predecessors, (415), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:59:21,066 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 360 states to 360 states and 426 transitions. [2022-02-24 03:59:21,066 INFO L78 Accepts]: Start accepts. Automaton has 360 states and 426 transitions. Word has length 73 [2022-02-24 03:59:21,066 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:59:21,066 INFO L470 AbstractCegarLoop]: Abstraction has 360 states and 426 transitions. [2022-02-24 03:59:21,066 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 1.763157894736842) internal successors, (67), 37 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:59:21,066 INFO L276 IsEmpty]: Start isEmpty. Operand 360 states and 426 transitions. [2022-02-24 03:59:21,066 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-02-24 03:59:21,066 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:59:21,066 INFO L514 BasicCegarLoop]: trace histogram [17, 17, 15, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:59:21,066 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable172 [2022-02-24 03:59:21,066 INFO L402 AbstractCegarLoop]: === Iteration 174 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:59:21,067 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:59:21,067 INFO L85 PathProgramCache]: Analyzing trace with hash -2047196449, now seen corresponding path program 135 times [2022-02-24 03:59:21,067 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:59:21,067 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [96892694] [2022-02-24 03:59:21,067 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:59:21,067 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:59:21,240 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:59:21,428 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:59:21,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:59:21,602 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:59:21,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:59:21,605 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:59:21,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:59:21,606 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 03:59:23,105 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:59:23,105 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [96892694] [2022-02-24 03:59:23,105 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [96892694] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:59:23,105 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:59:23,105 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [39] imperfect sequences [] total 39 [2022-02-24 03:59:23,105 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1189495009] [2022-02-24 03:59:23,105 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:59:23,106 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2022-02-24 03:59:23,106 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:59:23,106 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2022-02-24 03:59:23,106 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=1444, Unknown=0, NotChecked=0, Total=1640 [2022-02-24 03:59:23,106 INFO L87 Difference]: Start difference. First operand 360 states and 426 transitions. Second operand has 39 states, 39 states have (on average 1.7179487179487178) internal successors, (67), 38 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:59:27,075 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:59:27,075 INFO L93 Difference]: Finished difference Result 772 states and 907 transitions. [2022-02-24 03:59:27,075 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-02-24 03:59:27,075 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 1.7179487179487178) internal successors, (67), 38 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 73 [2022-02-24 03:59:27,075 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:59:27,076 INFO L225 Difference]: With dead ends: 772 [2022-02-24 03:59:27,076 INFO L226 Difference]: Without dead ends: 424 [2022-02-24 03:59:27,076 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 14 SyntacticMatches, 19 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 661 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=236, Invalid=1570, Unknown=0, NotChecked=0, Total=1806 [2022-02-24 03:59:27,076 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 97 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 2916 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 98 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 2940 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 2916 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2022-02-24 03:59:27,077 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [98 Valid, 57 Invalid, 2940 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 2916 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2022-02-24 03:59:27,077 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 424 states. [2022-02-24 03:59:28,548 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 424 to 360. [2022-02-24 03:59:28,549 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 360 states, 350 states have (on average 1.1857142857142857) internal successors, (415), 351 states have internal predecessors, (415), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:59:28,549 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 360 states to 360 states and 426 transitions. [2022-02-24 03:59:28,549 INFO L78 Accepts]: Start accepts. Automaton has 360 states and 426 transitions. Word has length 73 [2022-02-24 03:59:28,549 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:59:28,549 INFO L470 AbstractCegarLoop]: Abstraction has 360 states and 426 transitions. [2022-02-24 03:59:28,549 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 1.7179487179487178) internal successors, (67), 38 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:59:28,549 INFO L276 IsEmpty]: Start isEmpty. Operand 360 states and 426 transitions. [2022-02-24 03:59:28,550 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-02-24 03:59:28,550 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:59:28,550 INFO L514 BasicCegarLoop]: trace histogram [17, 17, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:59:28,550 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable173 [2022-02-24 03:59:28,550 INFO L402 AbstractCegarLoop]: === Iteration 175 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:59:28,550 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:59:28,550 INFO L85 PathProgramCache]: Analyzing trace with hash 1236653597, now seen corresponding path program 136 times [2022-02-24 03:59:28,550 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:59:28,550 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [998899201] [2022-02-24 03:59:28,550 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:59:28,550 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:59:28,603 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:59:28,752 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:59:28,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:59:28,895 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:59:28,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:59:28,898 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:59:28,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:59:28,899 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 03:59:30,481 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:59:30,481 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [998899201] [2022-02-24 03:59:30,481 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [998899201] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:59:30,481 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:59:30,481 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [40] imperfect sequences [] total 40 [2022-02-24 03:59:30,481 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [895009334] [2022-02-24 03:59:30,481 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:59:30,481 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-02-24 03:59:30,481 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:59:30,481 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-02-24 03:59:30,482 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=204, Invalid=1518, Unknown=0, NotChecked=0, Total=1722 [2022-02-24 03:59:30,482 INFO L87 Difference]: Start difference. First operand 360 states and 426 transitions. Second operand has 40 states, 40 states have (on average 1.675) internal successors, (67), 39 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:59:34,761 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:59:34,761 INFO L93 Difference]: Finished difference Result 772 states and 910 transitions. [2022-02-24 03:59:34,764 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2022-02-24 03:59:34,764 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.675) internal successors, (67), 39 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 73 [2022-02-24 03:59:34,764 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:59:34,764 INFO L225 Difference]: With dead ends: 772 [2022-02-24 03:59:34,764 INFO L226 Difference]: Without dead ends: 424 [2022-02-24 03:59:34,766 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 14 SyntacticMatches, 18 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 622 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=246, Invalid=1646, Unknown=0, NotChecked=0, Total=1892 [2022-02-24 03:59:34,766 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 102 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 2815 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 103 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 2840 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 2815 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2022-02-24 03:59:34,766 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [103 Valid, 63 Invalid, 2840 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 2815 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2022-02-24 03:59:34,767 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 424 states. [2022-02-24 03:59:36,239 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 424 to 363. [2022-02-24 03:59:36,239 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 363 states, 353 states have (on average 1.1926345609065157) internal successors, (421), 354 states have internal predecessors, (421), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:59:36,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 363 states to 363 states and 432 transitions. [2022-02-24 03:59:36,240 INFO L78 Accepts]: Start accepts. Automaton has 363 states and 432 transitions. Word has length 73 [2022-02-24 03:59:36,240 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:59:36,240 INFO L470 AbstractCegarLoop]: Abstraction has 363 states and 432 transitions. [2022-02-24 03:59:36,240 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 1.675) internal successors, (67), 39 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:59:36,240 INFO L276 IsEmpty]: Start isEmpty. Operand 363 states and 432 transitions. [2022-02-24 03:59:36,240 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2022-02-24 03:59:36,240 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:59:36,241 INFO L514 BasicCegarLoop]: trace histogram [17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:59:36,241 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable174 [2022-02-24 03:59:36,241 INFO L402 AbstractCegarLoop]: === Iteration 176 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:59:36,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:59:36,241 INFO L85 PathProgramCache]: Analyzing trace with hash 1071113247, now seen corresponding path program 17 times [2022-02-24 03:59:36,241 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:59:36,241 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [431983453] [2022-02-24 03:59:36,241 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:59:36,241 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:59:36,335 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:59:36,397 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:59:36,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:59:36,450 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:59:36,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:59:36,452 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:59:36,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:59:36,453 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 03:59:38,000 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:59:38,000 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [431983453] [2022-02-24 03:59:38,000 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [431983453] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:59:38,000 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:59:38,000 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [39] imperfect sequences [] total 39 [2022-02-24 03:59:38,000 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [102370878] [2022-02-24 03:59:38,000 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:59:38,001 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2022-02-24 03:59:38,001 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:59:38,001 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2022-02-24 03:59:38,001 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=1429, Unknown=0, NotChecked=0, Total=1560 [2022-02-24 03:59:38,001 INFO L87 Difference]: Start difference. First operand 363 states and 432 transitions. Second operand has 39 states, 39 states have (on average 1.7179487179487178) internal successors, (67), 38 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:59:42,488 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:59:42,488 INFO L93 Difference]: Finished difference Result 778 states and 922 transitions. [2022-02-24 03:59:42,491 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-02-24 03:59:42,491 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 1.7179487179487178) internal successors, (67), 38 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 73 [2022-02-24 03:59:42,491 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:59:42,492 INFO L225 Difference]: With dead ends: 778 [2022-02-24 03:59:42,492 INFO L226 Difference]: Without dead ends: 427 [2022-02-24 03:59:42,492 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 13 SyntacticMatches, 18 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 497 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=135, Invalid=1505, Unknown=0, NotChecked=0, Total=1640 [2022-02-24 03:59:42,492 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 74 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 3250 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 75 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 3255 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 3250 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2022-02-24 03:59:42,492 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [75 Valid, 73 Invalid, 3255 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 3250 Invalid, 0 Unknown, 0 Unchecked, 2.3s Time] [2022-02-24 03:59:42,493 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 427 states. [2022-02-24 03:59:43,903 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 427 to 369. [2022-02-24 03:59:43,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 369 states, 359 states have (on average 1.1894150417827298) internal successors, (427), 360 states have internal predecessors, (427), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:59:43,904 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 369 states to 369 states and 438 transitions. [2022-02-24 03:59:43,904 INFO L78 Accepts]: Start accepts. Automaton has 369 states and 438 transitions. Word has length 73 [2022-02-24 03:59:43,904 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:59:43,904 INFO L470 AbstractCegarLoop]: Abstraction has 369 states and 438 transitions. [2022-02-24 03:59:43,905 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 1.7179487179487178) internal successors, (67), 38 states have internal predecessors, (67), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:59:43,905 INFO L276 IsEmpty]: Start isEmpty. Operand 369 states and 438 transitions. [2022-02-24 03:59:43,905 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2022-02-24 03:59:43,905 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:59:43,905 INFO L514 BasicCegarLoop]: trace histogram [18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:59:43,905 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable175 [2022-02-24 03:59:43,905 INFO L402 AbstractCegarLoop]: === Iteration 177 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:59:43,905 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:59:43,905 INFO L85 PathProgramCache]: Analyzing trace with hash 503209918, now seen corresponding path program 18 times [2022-02-24 03:59:43,905 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:59:43,905 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2068067243] [2022-02-24 03:59:43,905 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:59:43,906 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:59:44,019 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:59:44,129 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 03:59:44,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:59:44,168 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:59:44,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:59:44,171 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:59:44,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:59:44,172 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 03:59:45,114 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:59:45,114 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2068067243] [2022-02-24 03:59:45,114 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [2068067243] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:59:45,114 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:59:45,115 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2022-02-24 03:59:45,115 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [820573941] [2022-02-24 03:59:45,115 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:59:45,115 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-02-24 03:59:45,115 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:59:45,115 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-02-24 03:59:45,115 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=559, Unknown=0, NotChecked=0, Total=650 [2022-02-24 03:59:45,115 INFO L87 Difference]: Start difference. First operand 369 states and 438 transitions. Second operand has 25 states, 25 states have (on average 2.8) internal successors, (70), 24 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:59:48,791 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:59:48,792 INFO L93 Difference]: Finished difference Result 883 states and 1024 transitions. [2022-02-24 03:59:48,792 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-02-24 03:59:48,792 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.8) internal successors, (70), 24 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 76 [2022-02-24 03:59:48,792 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:59:48,793 INFO L225 Difference]: With dead ends: 883 [2022-02-24 03:59:48,793 INFO L226 Difference]: Without dead ends: 526 [2022-02-24 03:59:48,793 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 15 SyntacticMatches, 36 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 132 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=95, Invalid=607, Unknown=0, NotChecked=0, Total=702 [2022-02-24 03:59:48,793 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 37 mSDsluCounter, 35 mSDsCounter, 0 mSdLazyCounter, 1840 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 1850 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1840 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-02-24 03:59:48,793 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 56 Invalid, 1850 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 1840 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-02-24 03:59:48,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 526 states. [2022-02-24 03:59:50,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 526 to 378. [2022-02-24 03:59:50,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 378 states, 368 states have (on average 1.184782608695652) internal successors, (436), 369 states have internal predecessors, (436), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:59:50,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 378 states to 378 states and 447 transitions. [2022-02-24 03:59:50,433 INFO L78 Accepts]: Start accepts. Automaton has 378 states and 447 transitions. Word has length 76 [2022-02-24 03:59:50,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:59:50,433 INFO L470 AbstractCegarLoop]: Abstraction has 378 states and 447 transitions. [2022-02-24 03:59:50,433 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 2.8) internal successors, (70), 24 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:59:50,433 INFO L276 IsEmpty]: Start isEmpty. Operand 378 states and 447 transitions. [2022-02-24 03:59:50,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2022-02-24 03:59:50,434 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:59:50,434 INFO L514 BasicCegarLoop]: trace histogram [18, 18, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:59:50,434 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable176 [2022-02-24 03:59:50,434 INFO L402 AbstractCegarLoop]: === Iteration 178 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:59:50,434 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:59:50,434 INFO L85 PathProgramCache]: Analyzing trace with hash 1182482172, now seen corresponding path program 137 times [2022-02-24 03:59:50,434 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:59:50,434 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1762596075] [2022-02-24 03:59:50,434 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:59:50,434 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:59:50,615 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:59:50,821 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:59:50,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:59:51,017 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:59:51,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:59:51,020 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:59:51,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:59:51,021 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 03:59:52,459 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 03:59:52,459 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1762596075] [2022-02-24 03:59:52,460 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1762596075] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 03:59:52,460 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 03:59:52,460 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2022-02-24 03:59:52,460 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2146953216] [2022-02-24 03:59:52,460 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 03:59:52,460 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-02-24 03:59:52,460 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 03:59:52,460 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-02-24 03:59:52,460 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=669, Unknown=0, NotChecked=0, Total=756 [2022-02-24 03:59:52,460 INFO L87 Difference]: Start difference. First operand 378 states and 447 transitions. Second operand has 26 states, 26 states have (on average 2.6923076923076925) internal successors, (70), 25 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:59:56,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 03:59:56,689 INFO L93 Difference]: Finished difference Result 901 states and 1042 transitions. [2022-02-24 03:59:56,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-02-24 03:59:56,689 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.6923076923076925) internal successors, (70), 25 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 76 [2022-02-24 03:59:56,689 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 03:59:56,690 INFO L225 Difference]: With dead ends: 901 [2022-02-24 03:59:56,690 INFO L226 Difference]: Without dead ends: 535 [2022-02-24 03:59:56,690 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 14 SyntacticMatches, 35 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 277 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=99, Invalid=771, Unknown=0, NotChecked=0, Total=870 [2022-02-24 03:59:56,690 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 44 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 1800 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 1810 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1800 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-02-24 03:59:56,690 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [45 Valid, 49 Invalid, 1810 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 1800 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-02-24 03:59:56,691 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 535 states. [2022-02-24 03:59:58,336 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 535 to 378. [2022-02-24 03:59:58,336 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 378 states, 368 states have (on average 1.184782608695652) internal successors, (436), 369 states have internal predecessors, (436), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 03:59:58,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 378 states to 378 states and 447 transitions. [2022-02-24 03:59:58,337 INFO L78 Accepts]: Start accepts. Automaton has 378 states and 447 transitions. Word has length 76 [2022-02-24 03:59:58,337 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 03:59:58,337 INFO L470 AbstractCegarLoop]: Abstraction has 378 states and 447 transitions. [2022-02-24 03:59:58,337 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 2.6923076923076925) internal successors, (70), 25 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 03:59:58,337 INFO L276 IsEmpty]: Start isEmpty. Operand 378 states and 447 transitions. [2022-02-24 03:59:58,337 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2022-02-24 03:59:58,337 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 03:59:58,337 INFO L514 BasicCegarLoop]: trace histogram [18, 18, 16, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 03:59:58,337 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable177 [2022-02-24 03:59:58,337 INFO L402 AbstractCegarLoop]: === Iteration 179 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 03:59:58,338 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 03:59:58,338 INFO L85 PathProgramCache]: Analyzing trace with hash 1743181950, now seen corresponding path program 138 times [2022-02-24 03:59:58,338 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 03:59:58,338 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [574608182] [2022-02-24 03:59:58,338 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 03:59:58,338 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 03:59:58,521 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:59:58,678 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 03:59:58,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:59:58,787 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 03:59:58,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:59:58,804 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 03:59:58,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 03:59:58,806 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 04:00:00,186 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 04:00:00,187 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [574608182] [2022-02-24 04:00:00,187 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [574608182] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 04:00:00,187 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 04:00:00,187 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2022-02-24 04:00:00,187 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [169905350] [2022-02-24 04:00:00,187 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 04:00:00,187 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-02-24 04:00:00,187 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 04:00:00,187 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-02-24 04:00:00,188 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=717, Unknown=0, NotChecked=0, Total=812 [2022-02-24 04:00:00,188 INFO L87 Difference]: Start difference. First operand 378 states and 447 transitions. Second operand has 27 states, 27 states have (on average 2.5925925925925926) internal successors, (70), 26 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 04:00:04,877 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 04:00:04,877 INFO L93 Difference]: Finished difference Result 895 states and 1036 transitions. [2022-02-24 04:00:04,877 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-02-24 04:00:04,878 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 2.5925925925925926) internal successors, (70), 26 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 76 [2022-02-24 04:00:04,878 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 04:00:04,878 INFO L225 Difference]: With dead ends: 895 [2022-02-24 04:00:04,878 INFO L226 Difference]: Without dead ends: 529 [2022-02-24 04:00:04,880 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 14 SyntacticMatches, 34 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 370 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=109, Invalid=821, Unknown=0, NotChecked=0, Total=930 [2022-02-24 04:00:04,880 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 48 mSDsluCounter, 31 mSDsCounter, 0 mSdLazyCounter, 2017 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 2028 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 2017 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2022-02-24 04:00:04,880 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [49 Valid, 52 Invalid, 2028 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 2017 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2022-02-24 04:00:04,880 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 529 states. [2022-02-24 04:00:06,777 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 529 to 378. [2022-02-24 04:00:06,777 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 378 states, 368 states have (on average 1.184782608695652) internal successors, (436), 369 states have internal predecessors, (436), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 04:00:06,777 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 378 states to 378 states and 447 transitions. [2022-02-24 04:00:06,778 INFO L78 Accepts]: Start accepts. Automaton has 378 states and 447 transitions. Word has length 76 [2022-02-24 04:00:06,778 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 04:00:06,778 INFO L470 AbstractCegarLoop]: Abstraction has 378 states and 447 transitions. [2022-02-24 04:00:06,778 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 2.5925925925925926) internal successors, (70), 26 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 04:00:06,778 INFO L276 IsEmpty]: Start isEmpty. Operand 378 states and 447 transitions. [2022-02-24 04:00:06,778 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2022-02-24 04:00:06,778 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 04:00:06,778 INFO L514 BasicCegarLoop]: trace histogram [18, 18, 15, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 04:00:06,778 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable178 [2022-02-24 04:00:06,778 INFO L402 AbstractCegarLoop]: === Iteration 180 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 04:00:06,778 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 04:00:06,779 INFO L85 PathProgramCache]: Analyzing trace with hash 1783856700, now seen corresponding path program 139 times [2022-02-24 04:00:06,779 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 04:00:06,779 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1179566601] [2022-02-24 04:00:06,779 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 04:00:06,779 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 04:00:06,956 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 04:00:07,127 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 04:00:07,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:00:07,274 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 04:00:07,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:00:07,277 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 04:00:07,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:00:07,278 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 04:00:09,185 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 04:00:09,185 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1179566601] [2022-02-24 04:00:09,185 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1179566601] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 04:00:09,186 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 04:00:09,186 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [] total 28 [2022-02-24 04:00:09,186 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [889481369] [2022-02-24 04:00:09,186 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 04:00:09,186 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-02-24 04:00:09,186 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 04:00:09,186 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-02-24 04:00:09,186 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=767, Unknown=0, NotChecked=0, Total=870 [2022-02-24 04:00:09,186 INFO L87 Difference]: Start difference. First operand 378 states and 447 transitions. Second operand has 28 states, 28 states have (on average 2.5) internal successors, (70), 27 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 04:00:14,110 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 04:00:14,110 INFO L93 Difference]: Finished difference Result 889 states and 1030 transitions. [2022-02-24 04:00:14,110 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-02-24 04:00:14,110 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 2.5) internal successors, (70), 27 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 76 [2022-02-24 04:00:14,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 04:00:14,111 INFO L225 Difference]: With dead ends: 889 [2022-02-24 04:00:14,111 INFO L226 Difference]: Without dead ends: 523 [2022-02-24 04:00:14,112 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 14 SyntacticMatches, 33 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 454 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=119, Invalid=873, Unknown=0, NotChecked=0, Total=992 [2022-02-24 04:00:14,112 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 53 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 1990 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 53 SdHoareTripleChecker+Invalid, 2002 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 1990 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-02-24 04:00:14,112 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [54 Valid, 53 Invalid, 2002 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 1990 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2022-02-24 04:00:14,112 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 523 states. [2022-02-24 04:00:15,945 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 523 to 378. [2022-02-24 04:00:15,945 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 378 states, 368 states have (on average 1.184782608695652) internal successors, (436), 369 states have internal predecessors, (436), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 04:00:15,946 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 378 states to 378 states and 447 transitions. [2022-02-24 04:00:15,946 INFO L78 Accepts]: Start accepts. Automaton has 378 states and 447 transitions. Word has length 76 [2022-02-24 04:00:15,946 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 04:00:15,946 INFO L470 AbstractCegarLoop]: Abstraction has 378 states and 447 transitions. [2022-02-24 04:00:15,946 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 2.5) internal successors, (70), 27 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 04:00:15,946 INFO L276 IsEmpty]: Start isEmpty. Operand 378 states and 447 transitions. [2022-02-24 04:00:15,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2022-02-24 04:00:15,946 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 04:00:15,947 INFO L514 BasicCegarLoop]: trace histogram [18, 18, 14, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 04:00:15,947 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable179 [2022-02-24 04:00:15,947 INFO L402 AbstractCegarLoop]: === Iteration 181 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 04:00:15,947 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 04:00:15,947 INFO L85 PathProgramCache]: Analyzing trace with hash -2067209922, now seen corresponding path program 140 times [2022-02-24 04:00:15,947 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 04:00:15,947 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1623030248] [2022-02-24 04:00:15,947 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 04:00:15,947 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 04:00:16,126 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 04:00:16,293 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 04:00:16,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:00:16,439 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 04:00:16,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:00:16,442 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 04:00:16,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:00:16,444 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 04:00:18,233 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 04:00:18,234 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1623030248] [2022-02-24 04:00:18,234 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1623030248] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 04:00:18,234 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 04:00:18,234 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2022-02-24 04:00:18,234 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [308403422] [2022-02-24 04:00:18,234 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 04:00:18,234 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-02-24 04:00:18,234 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 04:00:18,234 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-02-24 04:00:18,235 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=819, Unknown=0, NotChecked=0, Total=930 [2022-02-24 04:00:18,235 INFO L87 Difference]: Start difference. First operand 378 states and 447 transitions. Second operand has 29 states, 29 states have (on average 2.413793103448276) internal successors, (70), 28 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 04:00:22,909 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 04:00:22,909 INFO L93 Difference]: Finished difference Result 883 states and 1024 transitions. [2022-02-24 04:00:22,909 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-02-24 04:00:22,909 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 2.413793103448276) internal successors, (70), 28 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 76 [2022-02-24 04:00:22,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 04:00:22,910 INFO L225 Difference]: With dead ends: 883 [2022-02-24 04:00:22,910 INFO L226 Difference]: Without dead ends: 517 [2022-02-24 04:00:22,910 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 14 SyntacticMatches, 32 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 529 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=129, Invalid=927, Unknown=0, NotChecked=0, Total=1056 [2022-02-24 04:00:22,911 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 55 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 1729 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 1742 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 1729 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2022-02-24 04:00:22,911 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [56 Valid, 58 Invalid, 1742 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 1729 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2022-02-24 04:00:22,911 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 517 states. [2022-02-24 04:00:24,793 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 517 to 378. [2022-02-24 04:00:24,793 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 378 states, 368 states have (on average 1.184782608695652) internal successors, (436), 369 states have internal predecessors, (436), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 04:00:24,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 378 states to 378 states and 447 transitions. [2022-02-24 04:00:24,794 INFO L78 Accepts]: Start accepts. Automaton has 378 states and 447 transitions. Word has length 76 [2022-02-24 04:00:24,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 04:00:24,794 INFO L470 AbstractCegarLoop]: Abstraction has 378 states and 447 transitions. [2022-02-24 04:00:24,794 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 2.413793103448276) internal successors, (70), 28 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 04:00:24,794 INFO L276 IsEmpty]: Start isEmpty. Operand 378 states and 447 transitions. [2022-02-24 04:00:24,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2022-02-24 04:00:24,795 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 04:00:24,795 INFO L514 BasicCegarLoop]: trace histogram [18, 18, 13, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 04:00:24,795 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable180 [2022-02-24 04:00:24,795 INFO L402 AbstractCegarLoop]: === Iteration 182 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 04:00:24,795 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 04:00:24,795 INFO L85 PathProgramCache]: Analyzing trace with hash 1746677116, now seen corresponding path program 141 times [2022-02-24 04:00:24,795 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 04:00:24,795 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [215845918] [2022-02-24 04:00:24,796 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 04:00:24,796 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 04:00:24,966 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 04:00:25,143 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 04:00:25,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:00:25,324 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 04:00:25,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:00:25,326 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 04:00:25,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:00:25,328 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 04:00:27,025 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 04:00:27,026 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [215845918] [2022-02-24 04:00:27,026 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [215845918] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 04:00:27,026 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 04:00:27,026 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2022-02-24 04:00:27,026 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [330196462] [2022-02-24 04:00:27,026 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 04:00:27,026 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-02-24 04:00:27,026 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 04:00:27,026 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-02-24 04:00:27,026 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=873, Unknown=0, NotChecked=0, Total=992 [2022-02-24 04:00:27,026 INFO L87 Difference]: Start difference. First operand 378 states and 447 transitions. Second operand has 30 states, 30 states have (on average 2.3333333333333335) internal successors, (70), 29 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 04:00:31,257 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 04:00:31,257 INFO L93 Difference]: Finished difference Result 877 states and 1018 transitions. [2022-02-24 04:00:31,257 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-02-24 04:00:31,257 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 2.3333333333333335) internal successors, (70), 29 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 76 [2022-02-24 04:00:31,257 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 04:00:31,258 INFO L225 Difference]: With dead ends: 877 [2022-02-24 04:00:31,258 INFO L226 Difference]: Without dead ends: 511 [2022-02-24 04:00:31,258 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 14 SyntacticMatches, 31 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 595 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=139, Invalid=983, Unknown=0, NotChecked=0, Total=1122 [2022-02-24 04:00:31,258 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 68 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 1816 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 47 SdHoareTripleChecker+Invalid, 1830 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 1816 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-02-24 04:00:31,259 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [69 Valid, 47 Invalid, 1830 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 1816 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-02-24 04:00:31,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 511 states. [2022-02-24 04:00:33,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 511 to 378. [2022-02-24 04:00:33,124 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 378 states, 368 states have (on average 1.184782608695652) internal successors, (436), 369 states have internal predecessors, (436), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 04:00:33,125 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 378 states to 378 states and 447 transitions. [2022-02-24 04:00:33,125 INFO L78 Accepts]: Start accepts. Automaton has 378 states and 447 transitions. Word has length 76 [2022-02-24 04:00:33,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 04:00:33,125 INFO L470 AbstractCegarLoop]: Abstraction has 378 states and 447 transitions. [2022-02-24 04:00:33,125 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 2.3333333333333335) internal successors, (70), 29 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 04:00:33,125 INFO L276 IsEmpty]: Start isEmpty. Operand 378 states and 447 transitions. [2022-02-24 04:00:33,125 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2022-02-24 04:00:33,125 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 04:00:33,125 INFO L514 BasicCegarLoop]: trace histogram [18, 18, 12, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 04:00:33,125 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable181 [2022-02-24 04:00:33,125 INFO L402 AbstractCegarLoop]: === Iteration 183 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 04:00:33,126 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 04:00:33,126 INFO L85 PathProgramCache]: Analyzing trace with hash 1393588734, now seen corresponding path program 142 times [2022-02-24 04:00:33,126 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 04:00:33,126 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1481736829] [2022-02-24 04:00:33,126 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 04:00:33,126 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 04:00:33,303 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 04:00:33,480 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 04:00:33,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:00:33,647 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 04:00:33,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:00:33,650 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 04:00:33,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:00:33,651 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 04:00:35,269 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 04:00:35,270 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1481736829] [2022-02-24 04:00:35,270 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1481736829] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 04:00:35,270 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 04:00:35,270 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2022-02-24 04:00:35,270 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1324571176] [2022-02-24 04:00:35,270 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 04:00:35,270 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-02-24 04:00:35,270 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 04:00:35,270 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-02-24 04:00:35,270 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=127, Invalid=929, Unknown=0, NotChecked=0, Total=1056 [2022-02-24 04:00:35,271 INFO L87 Difference]: Start difference. First operand 378 states and 447 transitions. Second operand has 31 states, 31 states have (on average 2.2580645161290325) internal successors, (70), 30 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 04:00:39,969 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 04:00:39,969 INFO L93 Difference]: Finished difference Result 871 states and 1012 transitions. [2022-02-24 04:00:39,970 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2022-02-24 04:00:39,970 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 2.2580645161290325) internal successors, (70), 30 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 76 [2022-02-24 04:00:39,970 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 04:00:39,970 INFO L225 Difference]: With dead ends: 871 [2022-02-24 04:00:39,970 INFO L226 Difference]: Without dead ends: 505 [2022-02-24 04:00:39,972 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 14 SyntacticMatches, 30 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 652 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=149, Invalid=1041, Unknown=0, NotChecked=0, Total=1190 [2022-02-24 04:00:39,972 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 65 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 1717 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 53 SdHoareTripleChecker+Invalid, 1732 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 1717 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2022-02-24 04:00:39,972 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [66 Valid, 53 Invalid, 1732 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 1717 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2022-02-24 04:00:39,972 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 505 states. [2022-02-24 04:00:41,753 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 505 to 378. [2022-02-24 04:00:41,753 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 378 states, 368 states have (on average 1.184782608695652) internal successors, (436), 369 states have internal predecessors, (436), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 04:00:41,754 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 378 states to 378 states and 447 transitions. [2022-02-24 04:00:41,754 INFO L78 Accepts]: Start accepts. Automaton has 378 states and 447 transitions. Word has length 76 [2022-02-24 04:00:41,754 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 04:00:41,754 INFO L470 AbstractCegarLoop]: Abstraction has 378 states and 447 transitions. [2022-02-24 04:00:41,754 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 2.2580645161290325) internal successors, (70), 30 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 04:00:41,754 INFO L276 IsEmpty]: Start isEmpty. Operand 378 states and 447 transitions. [2022-02-24 04:00:41,754 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2022-02-24 04:00:41,754 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 04:00:41,754 INFO L514 BasicCegarLoop]: trace histogram [18, 18, 11, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 04:00:41,754 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable182 [2022-02-24 04:00:41,754 INFO L402 AbstractCegarLoop]: === Iteration 184 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 04:00:41,754 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 04:00:41,755 INFO L85 PathProgramCache]: Analyzing trace with hash -655799108, now seen corresponding path program 143 times [2022-02-24 04:00:41,755 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 04:00:41,755 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2054490532] [2022-02-24 04:00:41,755 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 04:00:41,755 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 04:00:41,935 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 04:00:42,121 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 04:00:42,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:00:42,266 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 04:00:42,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:00:42,269 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 04:00:42,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:00:42,270 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 04:00:44,035 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 04:00:44,036 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2054490532] [2022-02-24 04:00:44,036 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [2054490532] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 04:00:44,036 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 04:00:44,036 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2022-02-24 04:00:44,036 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1070052041] [2022-02-24 04:00:44,036 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 04:00:44,036 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-02-24 04:00:44,036 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 04:00:44,036 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-02-24 04:00:44,037 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=987, Unknown=0, NotChecked=0, Total=1122 [2022-02-24 04:00:44,037 INFO L87 Difference]: Start difference. First operand 378 states and 447 transitions. Second operand has 32 states, 32 states have (on average 2.1875) internal successors, (70), 31 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 04:00:49,152 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 04:00:49,152 INFO L93 Difference]: Finished difference Result 865 states and 1006 transitions. [2022-02-24 04:00:49,153 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-02-24 04:00:49,153 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 2.1875) internal successors, (70), 31 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 76 [2022-02-24 04:00:49,153 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 04:00:49,153 INFO L225 Difference]: With dead ends: 865 [2022-02-24 04:00:49,153 INFO L226 Difference]: Without dead ends: 499 [2022-02-24 04:00:49,154 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 14 SyntacticMatches, 29 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 700 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=159, Invalid=1101, Unknown=0, NotChecked=0, Total=1260 [2022-02-24 04:00:49,154 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 59 mSDsluCounter, 51 mSDsCounter, 0 mSdLazyCounter, 2430 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 72 SdHoareTripleChecker+Invalid, 2446 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 2430 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2022-02-24 04:00:49,154 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [60 Valid, 72 Invalid, 2446 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 2430 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2022-02-24 04:00:49,155 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 499 states. [2022-02-24 04:00:51,046 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 499 to 378. [2022-02-24 04:00:51,046 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 378 states, 368 states have (on average 1.184782608695652) internal successors, (436), 369 states have internal predecessors, (436), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 04:00:51,046 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 378 states to 378 states and 447 transitions. [2022-02-24 04:00:51,046 INFO L78 Accepts]: Start accepts. Automaton has 378 states and 447 transitions. Word has length 76 [2022-02-24 04:00:51,047 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 04:00:51,047 INFO L470 AbstractCegarLoop]: Abstraction has 378 states and 447 transitions. [2022-02-24 04:00:51,047 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 2.1875) internal successors, (70), 31 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 04:00:51,047 INFO L276 IsEmpty]: Start isEmpty. Operand 378 states and 447 transitions. [2022-02-24 04:00:51,047 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2022-02-24 04:00:51,047 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 04:00:51,047 INFO L514 BasicCegarLoop]: trace histogram [18, 18, 10, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 04:00:51,047 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable183 [2022-02-24 04:00:51,047 INFO L402 AbstractCegarLoop]: === Iteration 185 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 04:00:51,047 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 04:00:51,047 INFO L85 PathProgramCache]: Analyzing trace with hash -232152386, now seen corresponding path program 144 times [2022-02-24 04:00:51,047 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 04:00:51,048 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [853448572] [2022-02-24 04:00:51,048 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 04:00:51,048 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 04:00:51,213 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 04:00:51,401 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 04:00:51,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:00:51,577 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 04:00:51,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:00:51,579 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 04:00:51,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:00:51,581 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 04:00:53,369 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 04:00:53,370 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [853448572] [2022-02-24 04:00:53,370 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [853448572] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 04:00:53,370 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 04:00:53,370 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2022-02-24 04:00:53,370 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [243084100] [2022-02-24 04:00:53,370 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 04:00:53,370 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-02-24 04:00:53,370 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 04:00:53,370 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-02-24 04:00:53,370 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=1047, Unknown=0, NotChecked=0, Total=1190 [2022-02-24 04:00:53,370 INFO L87 Difference]: Start difference. First operand 378 states and 447 transitions. Second operand has 33 states, 33 states have (on average 2.121212121212121) internal successors, (70), 32 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 04:00:57,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 04:00:57,910 INFO L93 Difference]: Finished difference Result 859 states and 1000 transitions. [2022-02-24 04:00:57,911 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-02-24 04:00:57,911 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 2.121212121212121) internal successors, (70), 32 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 76 [2022-02-24 04:00:57,911 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 04:00:57,912 INFO L225 Difference]: With dead ends: 859 [2022-02-24 04:00:57,912 INFO L226 Difference]: Without dead ends: 493 [2022-02-24 04:00:57,912 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 14 SyntacticMatches, 28 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 739 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=169, Invalid=1163, Unknown=0, NotChecked=0, Total=1332 [2022-02-24 04:00:57,913 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 60 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 2189 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 68 SdHoareTripleChecker+Invalid, 2206 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 2189 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-02-24 04:00:57,913 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [61 Valid, 68 Invalid, 2206 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 2189 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2022-02-24 04:00:57,920 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 493 states. [2022-02-24 04:00:59,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 493 to 378. [2022-02-24 04:00:59,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 378 states, 368 states have (on average 1.184782608695652) internal successors, (436), 369 states have internal predecessors, (436), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 04:00:59,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 378 states to 378 states and 447 transitions. [2022-02-24 04:00:59,738 INFO L78 Accepts]: Start accepts. Automaton has 378 states and 447 transitions. Word has length 76 [2022-02-24 04:00:59,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 04:00:59,738 INFO L470 AbstractCegarLoop]: Abstraction has 378 states and 447 transitions. [2022-02-24 04:00:59,738 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 2.121212121212121) internal successors, (70), 32 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 04:00:59,738 INFO L276 IsEmpty]: Start isEmpty. Operand 378 states and 447 transitions. [2022-02-24 04:00:59,738 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2022-02-24 04:00:59,738 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 04:00:59,738 INFO L514 BasicCegarLoop]: trace histogram [18, 18, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 04:00:59,738 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable184 [2022-02-24 04:00:59,738 INFO L402 AbstractCegarLoop]: === Iteration 186 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 04:00:59,739 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 04:00:59,739 INFO L85 PathProgramCache]: Analyzing trace with hash -1261511684, now seen corresponding path program 145 times [2022-02-24 04:00:59,739 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 04:00:59,739 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1947495923] [2022-02-24 04:00:59,739 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 04:00:59,739 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 04:00:59,896 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 04:01:00,060 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 04:01:00,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:01:00,193 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 04:01:00,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:01:00,196 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 04:01:00,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:01:00,197 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 04:01:01,743 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 04:01:01,743 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1947495923] [2022-02-24 04:01:01,743 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1947495923] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 04:01:01,743 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 04:01:01,743 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [34] imperfect sequences [] total 34 [2022-02-24 04:01:01,743 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1831917201] [2022-02-24 04:01:01,744 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 04:01:01,744 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2022-02-24 04:01:01,744 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 04:01:01,744 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2022-02-24 04:01:01,744 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=151, Invalid=1109, Unknown=0, NotChecked=0, Total=1260 [2022-02-24 04:01:01,744 INFO L87 Difference]: Start difference. First operand 378 states and 447 transitions. Second operand has 34 states, 34 states have (on average 2.0588235294117645) internal successors, (70), 33 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 04:01:06,478 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 04:01:06,478 INFO L93 Difference]: Finished difference Result 853 states and 994 transitions. [2022-02-24 04:01:06,481 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-02-24 04:01:06,481 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 2.0588235294117645) internal successors, (70), 33 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 76 [2022-02-24 04:01:06,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 04:01:06,482 INFO L225 Difference]: With dead ends: 853 [2022-02-24 04:01:06,482 INFO L226 Difference]: Without dead ends: 487 [2022-02-24 04:01:06,483 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 14 SyntacticMatches, 27 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 769 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=179, Invalid=1227, Unknown=0, NotChecked=0, Total=1406 [2022-02-24 04:01:06,483 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 67 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 2531 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 68 SdHoareTripleChecker+Valid, 66 SdHoareTripleChecker+Invalid, 2549 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 2531 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2022-02-24 04:01:06,483 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [68 Valid, 66 Invalid, 2549 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 2531 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2022-02-24 04:01:06,483 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 487 states. [2022-02-24 04:01:08,277 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 487 to 378. [2022-02-24 04:01:08,278 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 378 states, 368 states have (on average 1.184782608695652) internal successors, (436), 369 states have internal predecessors, (436), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 04:01:08,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 378 states to 378 states and 447 transitions. [2022-02-24 04:01:08,278 INFO L78 Accepts]: Start accepts. Automaton has 378 states and 447 transitions. Word has length 76 [2022-02-24 04:01:08,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 04:01:08,278 INFO L470 AbstractCegarLoop]: Abstraction has 378 states and 447 transitions. [2022-02-24 04:01:08,278 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 2.0588235294117645) internal successors, (70), 33 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 04:01:08,278 INFO L276 IsEmpty]: Start isEmpty. Operand 378 states and 447 transitions. [2022-02-24 04:01:08,278 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2022-02-24 04:01:08,279 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 04:01:08,279 INFO L514 BasicCegarLoop]: trace histogram [18, 18, 10, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 04:01:08,279 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable185 [2022-02-24 04:01:08,279 INFO L402 AbstractCegarLoop]: === Iteration 187 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 04:01:08,279 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 04:01:08,279 INFO L85 PathProgramCache]: Analyzing trace with hash -2105517186, now seen corresponding path program 146 times [2022-02-24 04:01:08,279 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 04:01:08,279 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [971541465] [2022-02-24 04:01:08,279 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 04:01:08,279 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 04:01:08,445 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 04:01:08,623 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 04:01:08,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:01:08,796 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 04:01:08,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:01:08,799 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 04:01:08,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:01:08,800 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 04:01:10,299 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 04:01:10,299 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [971541465] [2022-02-24 04:01:10,299 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [971541465] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 04:01:10,299 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 04:01:10,300 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2022-02-24 04:01:10,300 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [775773403] [2022-02-24 04:01:10,300 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 04:01:10,300 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-02-24 04:01:10,300 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 04:01:10,300 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-02-24 04:01:10,300 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=1173, Unknown=0, NotChecked=0, Total=1332 [2022-02-24 04:01:10,300 INFO L87 Difference]: Start difference. First operand 378 states and 447 transitions. Second operand has 35 states, 35 states have (on average 2.0) internal successors, (70), 34 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 04:01:14,485 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 04:01:14,485 INFO L93 Difference]: Finished difference Result 847 states and 988 transitions. [2022-02-24 04:01:14,486 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-02-24 04:01:14,486 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 2.0) internal successors, (70), 34 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 76 [2022-02-24 04:01:14,486 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 04:01:14,486 INFO L225 Difference]: With dead ends: 847 [2022-02-24 04:01:14,486 INFO L226 Difference]: Without dead ends: 481 [2022-02-24 04:01:14,487 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 14 SyntacticMatches, 26 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 790 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=189, Invalid=1293, Unknown=0, NotChecked=0, Total=1482 [2022-02-24 04:01:14,487 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 90 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 1921 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 91 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 1940 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 1921 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-02-24 04:01:14,487 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [91 Valid, 51 Invalid, 1940 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 1921 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2022-02-24 04:01:14,487 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 481 states. [2022-02-24 04:01:16,295 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 481 to 378. [2022-02-24 04:01:16,296 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 378 states, 368 states have (on average 1.184782608695652) internal successors, (436), 369 states have internal predecessors, (436), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 04:01:16,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 378 states to 378 states and 447 transitions. [2022-02-24 04:01:16,297 INFO L78 Accepts]: Start accepts. Automaton has 378 states and 447 transitions. Word has length 76 [2022-02-24 04:01:16,297 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 04:01:16,297 INFO L470 AbstractCegarLoop]: Abstraction has 378 states and 447 transitions. [2022-02-24 04:01:16,297 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 2.0) internal successors, (70), 34 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 04:01:16,297 INFO L276 IsEmpty]: Start isEmpty. Operand 378 states and 447 transitions. [2022-02-24 04:01:16,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2022-02-24 04:01:16,297 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 04:01:16,297 INFO L514 BasicCegarLoop]: trace histogram [18, 18, 11, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 04:01:16,297 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable186 [2022-02-24 04:01:16,298 INFO L402 AbstractCegarLoop]: === Iteration 188 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 04:01:16,298 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 04:01:16,298 INFO L85 PathProgramCache]: Analyzing trace with hash -1830757572, now seen corresponding path program 147 times [2022-02-24 04:01:16,298 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 04:01:16,298 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [242404600] [2022-02-24 04:01:16,298 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 04:01:16,298 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 04:01:16,461 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 04:01:16,622 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 04:01:16,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:01:16,766 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 04:01:16,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:01:16,776 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 04:01:16,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:01:16,778 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 04:01:18,508 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 04:01:18,508 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [242404600] [2022-02-24 04:01:18,508 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [242404600] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 04:01:18,508 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 04:01:18,508 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [36] imperfect sequences [] total 36 [2022-02-24 04:01:18,508 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1951000714] [2022-02-24 04:01:18,508 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 04:01:18,508 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-02-24 04:01:18,508 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 04:01:18,508 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-02-24 04:01:18,509 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=167, Invalid=1239, Unknown=0, NotChecked=0, Total=1406 [2022-02-24 04:01:18,509 INFO L87 Difference]: Start difference. First operand 378 states and 447 transitions. Second operand has 36 states, 36 states have (on average 1.9444444444444444) internal successors, (70), 35 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 04:01:23,417 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 04:01:23,417 INFO L93 Difference]: Finished difference Result 841 states and 982 transitions. [2022-02-24 04:01:23,418 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-02-24 04:01:23,418 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 1.9444444444444444) internal successors, (70), 35 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 76 [2022-02-24 04:01:23,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 04:01:23,418 INFO L225 Difference]: With dead ends: 841 [2022-02-24 04:01:23,418 INFO L226 Difference]: Without dead ends: 475 [2022-02-24 04:01:23,419 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 14 SyntacticMatches, 25 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 802 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=199, Invalid=1361, Unknown=0, NotChecked=0, Total=1560 [2022-02-24 04:01:23,419 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 82 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 2794 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 83 SdHoareTripleChecker+Valid, 67 SdHoareTripleChecker+Invalid, 2814 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 2794 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2022-02-24 04:01:23,419 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [83 Valid, 67 Invalid, 2814 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 2794 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2022-02-24 04:01:23,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 475 states. [2022-02-24 04:01:25,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 475 to 378. [2022-02-24 04:01:25,218 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 378 states, 368 states have (on average 1.184782608695652) internal successors, (436), 369 states have internal predecessors, (436), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 04:01:25,218 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 378 states to 378 states and 447 transitions. [2022-02-24 04:01:25,218 INFO L78 Accepts]: Start accepts. Automaton has 378 states and 447 transitions. Word has length 76 [2022-02-24 04:01:25,218 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 04:01:25,218 INFO L470 AbstractCegarLoop]: Abstraction has 378 states and 447 transitions. [2022-02-24 04:01:25,218 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 1.9444444444444444) internal successors, (70), 35 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 04:01:25,218 INFO L276 IsEmpty]: Start isEmpty. Operand 378 states and 447 transitions. [2022-02-24 04:01:25,219 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2022-02-24 04:01:25,219 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 04:01:25,219 INFO L514 BasicCegarLoop]: trace histogram [18, 18, 12, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 04:01:25,219 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable187 [2022-02-24 04:01:25,219 INFO L402 AbstractCegarLoop]: === Iteration 189 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 04:01:25,219 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 04:01:25,219 INFO L85 PathProgramCache]: Analyzing trace with hash -444554178, now seen corresponding path program 148 times [2022-02-24 04:01:25,219 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 04:01:25,219 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [94412410] [2022-02-24 04:01:25,219 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 04:01:25,219 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 04:01:25,383 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 04:01:25,541 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 04:01:25,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:01:25,678 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 04:01:25,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:01:25,680 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 04:01:25,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:01:25,681 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 04:01:27,339 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 04:01:27,339 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [94412410] [2022-02-24 04:01:27,339 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [94412410] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 04:01:27,339 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 04:01:27,339 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [37] imperfect sequences [] total 37 [2022-02-24 04:01:27,339 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1884133880] [2022-02-24 04:01:27,339 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 04:01:27,339 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2022-02-24 04:01:27,339 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 04:01:27,340 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2022-02-24 04:01:27,340 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=1307, Unknown=0, NotChecked=0, Total=1482 [2022-02-24 04:01:27,340 INFO L87 Difference]: Start difference. First operand 378 states and 447 transitions. Second operand has 37 states, 37 states have (on average 1.8918918918918919) internal successors, (70), 36 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 04:01:31,538 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 04:01:31,538 INFO L93 Difference]: Finished difference Result 835 states and 976 transitions. [2022-02-24 04:01:31,538 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-02-24 04:01:31,538 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 1.8918918918918919) internal successors, (70), 36 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 76 [2022-02-24 04:01:31,538 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 04:01:31,539 INFO L225 Difference]: With dead ends: 835 [2022-02-24 04:01:31,539 INFO L226 Difference]: Without dead ends: 469 [2022-02-24 04:01:31,539 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 14 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 805 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=209, Invalid=1431, Unknown=0, NotChecked=0, Total=1640 [2022-02-24 04:01:31,539 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 91 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 2014 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 92 SdHoareTripleChecker+Valid, 50 SdHoareTripleChecker+Invalid, 2035 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 2014 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2022-02-24 04:01:31,539 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [92 Valid, 50 Invalid, 2035 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 2014 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2022-02-24 04:01:31,540 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 469 states. [2022-02-24 04:01:33,385 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 469 to 378. [2022-02-24 04:01:33,386 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 378 states, 368 states have (on average 1.184782608695652) internal successors, (436), 369 states have internal predecessors, (436), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 04:01:33,386 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 378 states to 378 states and 447 transitions. [2022-02-24 04:01:33,386 INFO L78 Accepts]: Start accepts. Automaton has 378 states and 447 transitions. Word has length 76 [2022-02-24 04:01:33,386 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 04:01:33,386 INFO L470 AbstractCegarLoop]: Abstraction has 378 states and 447 transitions. [2022-02-24 04:01:33,386 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 1.8918918918918919) internal successors, (70), 36 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 04:01:33,386 INFO L276 IsEmpty]: Start isEmpty. Operand 378 states and 447 transitions. [2022-02-24 04:01:33,387 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2022-02-24 04:01:33,387 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 04:01:33,387 INFO L514 BasicCegarLoop]: trace histogram [18, 18, 13, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 04:01:33,387 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable188 [2022-02-24 04:01:33,387 INFO L402 AbstractCegarLoop]: === Iteration 190 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 04:01:33,387 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 04:01:33,387 INFO L85 PathProgramCache]: Analyzing trace with hash -382514564, now seen corresponding path program 149 times [2022-02-24 04:01:33,387 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 04:01:33,387 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1583263930] [2022-02-24 04:01:33,387 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 04:01:33,387 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 04:01:33,587 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 04:01:33,746 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 04:01:33,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:01:33,874 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 04:01:33,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:01:33,876 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 04:01:33,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:01:33,878 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 04:01:35,478 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 04:01:35,478 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1583263930] [2022-02-24 04:01:35,478 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1583263930] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 04:01:35,478 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 04:01:35,478 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [38] imperfect sequences [] total 38 [2022-02-24 04:01:35,478 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2114809615] [2022-02-24 04:01:35,478 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 04:01:35,478 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-02-24 04:01:35,478 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 04:01:35,479 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-02-24 04:01:35,479 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=183, Invalid=1377, Unknown=0, NotChecked=0, Total=1560 [2022-02-24 04:01:35,479 INFO L87 Difference]: Start difference. First operand 378 states and 447 transitions. Second operand has 38 states, 38 states have (on average 1.8421052631578947) internal successors, (70), 37 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 04:01:40,021 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 04:01:40,021 INFO L93 Difference]: Finished difference Result 829 states and 970 transitions. [2022-02-24 04:01:40,021 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2022-02-24 04:01:40,021 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.8421052631578947) internal successors, (70), 37 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 76 [2022-02-24 04:01:40,021 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 04:01:40,022 INFO L225 Difference]: With dead ends: 829 [2022-02-24 04:01:40,022 INFO L226 Difference]: Without dead ends: 463 [2022-02-24 04:01:40,022 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 14 SyntacticMatches, 23 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 799 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=219, Invalid=1503, Unknown=0, NotChecked=0, Total=1722 [2022-02-24 04:01:40,022 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 94 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 2714 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 95 SdHoareTripleChecker+Valid, 54 SdHoareTripleChecker+Invalid, 2736 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 2714 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2022-02-24 04:01:40,022 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [95 Valid, 54 Invalid, 2736 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 2714 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2022-02-24 04:01:40,023 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 463 states. [2022-02-24 04:01:41,830 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 463 to 378. [2022-02-24 04:01:41,830 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 378 states, 368 states have (on average 1.184782608695652) internal successors, (436), 369 states have internal predecessors, (436), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 04:01:41,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 378 states to 378 states and 447 transitions. [2022-02-24 04:01:41,831 INFO L78 Accepts]: Start accepts. Automaton has 378 states and 447 transitions. Word has length 76 [2022-02-24 04:01:41,831 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 04:01:41,831 INFO L470 AbstractCegarLoop]: Abstraction has 378 states and 447 transitions. [2022-02-24 04:01:41,831 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 1.8421052631578947) internal successors, (70), 37 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 04:01:41,831 INFO L276 IsEmpty]: Start isEmpty. Operand 378 states and 447 transitions. [2022-02-24 04:01:41,831 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2022-02-24 04:01:41,831 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 04:01:41,832 INFO L514 BasicCegarLoop]: trace histogram [18, 18, 14, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 04:01:41,832 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable189 [2022-02-24 04:01:41,832 INFO L402 AbstractCegarLoop]: === Iteration 191 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 04:01:41,832 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 04:01:41,832 INFO L85 PathProgramCache]: Analyzing trace with hash 2107014398, now seen corresponding path program 150 times [2022-02-24 04:01:41,832 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 04:01:41,832 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1190130142] [2022-02-24 04:01:41,832 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 04:01:41,832 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 04:01:42,001 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 04:01:42,160 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 04:01:42,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:01:42,284 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 04:01:42,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:01:42,287 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 04:01:42,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:01:42,288 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 04:01:43,932 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 04:01:43,932 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1190130142] [2022-02-24 04:01:43,932 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1190130142] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 04:01:43,932 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 04:01:43,932 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [39] imperfect sequences [] total 39 [2022-02-24 04:01:43,932 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [366228314] [2022-02-24 04:01:43,932 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 04:01:43,932 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2022-02-24 04:01:43,932 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 04:01:43,933 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2022-02-24 04:01:43,933 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=191, Invalid=1449, Unknown=0, NotChecked=0, Total=1640 [2022-02-24 04:01:43,933 INFO L87 Difference]: Start difference. First operand 378 states and 447 transitions. Second operand has 39 states, 39 states have (on average 1.794871794871795) internal successors, (70), 38 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 04:01:48,178 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 04:01:48,178 INFO L93 Difference]: Finished difference Result 823 states and 964 transitions. [2022-02-24 04:01:48,179 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-02-24 04:01:48,179 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 1.794871794871795) internal successors, (70), 38 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 76 [2022-02-24 04:01:48,179 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 04:01:48,179 INFO L225 Difference]: With dead ends: 823 [2022-02-24 04:01:48,179 INFO L226 Difference]: Without dead ends: 457 [2022-02-24 04:01:48,180 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 14 SyntacticMatches, 22 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 784 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=229, Invalid=1577, Unknown=0, NotChecked=0, Total=1806 [2022-02-24 04:01:48,180 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 109 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 2165 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 110 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 2188 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 2165 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2022-02-24 04:01:48,180 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [110 Valid, 42 Invalid, 2188 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 2165 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2022-02-24 04:01:48,180 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 457 states. [2022-02-24 04:01:49,956 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 457 to 378. [2022-02-24 04:01:49,957 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 378 states, 368 states have (on average 1.184782608695652) internal successors, (436), 369 states have internal predecessors, (436), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 04:01:49,957 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 378 states to 378 states and 447 transitions. [2022-02-24 04:01:49,957 INFO L78 Accepts]: Start accepts. Automaton has 378 states and 447 transitions. Word has length 76 [2022-02-24 04:01:49,957 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 04:01:49,957 INFO L470 AbstractCegarLoop]: Abstraction has 378 states and 447 transitions. [2022-02-24 04:01:49,957 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 1.794871794871795) internal successors, (70), 38 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 04:01:49,957 INFO L276 IsEmpty]: Start isEmpty. Operand 378 states and 447 transitions. [2022-02-24 04:01:49,958 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2022-02-24 04:01:49,958 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 04:01:49,958 INFO L514 BasicCegarLoop]: trace histogram [18, 18, 15, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 04:01:49,958 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable190 [2022-02-24 04:01:49,958 INFO L402 AbstractCegarLoop]: === Iteration 192 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 04:01:49,958 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 04:01:49,958 INFO L85 PathProgramCache]: Analyzing trace with hash 1289365948, now seen corresponding path program 151 times [2022-02-24 04:01:49,958 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 04:01:49,958 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1140683037] [2022-02-24 04:01:49,958 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 04:01:49,959 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 04:01:50,112 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 04:01:50,266 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 04:01:50,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:01:50,395 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 04:01:50,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:01:50,397 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 04:01:50,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:01:50,399 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 04:01:52,236 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 04:01:52,236 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1140683037] [2022-02-24 04:01:52,237 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1140683037] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 04:01:52,237 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 04:01:52,237 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [40] imperfect sequences [] total 40 [2022-02-24 04:01:52,238 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2095478727] [2022-02-24 04:01:52,238 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 04:01:52,238 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-02-24 04:01:52,238 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 04:01:52,238 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-02-24 04:01:52,238 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=199, Invalid=1523, Unknown=0, NotChecked=0, Total=1722 [2022-02-24 04:01:52,238 INFO L87 Difference]: Start difference. First operand 378 states and 447 transitions. Second operand has 40 states, 40 states have (on average 1.75) internal successors, (70), 39 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 04:01:56,879 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 04:01:56,879 INFO L93 Difference]: Finished difference Result 817 states and 958 transitions. [2022-02-24 04:01:56,880 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2022-02-24 04:01:56,880 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.75) internal successors, (70), 39 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 76 [2022-02-24 04:01:56,880 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 04:01:56,880 INFO L225 Difference]: With dead ends: 817 [2022-02-24 04:01:56,880 INFO L226 Difference]: Without dead ends: 451 [2022-02-24 04:01:56,881 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 14 SyntacticMatches, 21 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 760 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=239, Invalid=1653, Unknown=0, NotChecked=0, Total=1892 [2022-02-24 04:01:56,881 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 103 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 2634 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 104 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 2658 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 2634 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2022-02-24 04:01:56,881 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [104 Valid, 58 Invalid, 2658 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 2634 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2022-02-24 04:01:56,881 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 451 states. [2022-02-24 04:01:58,624 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 451 to 378. [2022-02-24 04:01:58,625 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 378 states, 368 states have (on average 1.184782608695652) internal successors, (436), 369 states have internal predecessors, (436), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 04:01:58,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 378 states to 378 states and 447 transitions. [2022-02-24 04:01:58,625 INFO L78 Accepts]: Start accepts. Automaton has 378 states and 447 transitions. Word has length 76 [2022-02-24 04:01:58,625 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 04:01:58,626 INFO L470 AbstractCegarLoop]: Abstraction has 378 states and 447 transitions. [2022-02-24 04:01:58,626 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 1.75) internal successors, (70), 39 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 04:01:58,626 INFO L276 IsEmpty]: Start isEmpty. Operand 378 states and 447 transitions. [2022-02-24 04:01:58,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2022-02-24 04:01:58,626 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 04:01:58,626 INFO L514 BasicCegarLoop]: trace histogram [18, 18, 16, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 04:01:58,626 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable191 [2022-02-24 04:01:58,626 INFO L402 AbstractCegarLoop]: === Iteration 193 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 04:01:58,626 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 04:01:58,626 INFO L85 PathProgramCache]: Analyzing trace with hash -298981954, now seen corresponding path program 152 times [2022-02-24 04:01:58,626 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 04:01:58,627 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1032282137] [2022-02-24 04:01:58,627 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 04:01:58,627 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 04:01:58,792 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 04:01:58,953 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 04:01:58,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:01:59,083 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 04:01:59,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:01:59,086 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 04:01:59,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:01:59,087 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 04:02:00,834 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 04:02:00,834 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1032282137] [2022-02-24 04:02:00,834 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1032282137] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 04:02:00,834 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 04:02:00,834 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [41] imperfect sequences [] total 41 [2022-02-24 04:02:00,834 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1543723409] [2022-02-24 04:02:00,834 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 04:02:00,834 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2022-02-24 04:02:00,834 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 04:02:00,835 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2022-02-24 04:02:00,835 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=207, Invalid=1599, Unknown=0, NotChecked=0, Total=1806 [2022-02-24 04:02:00,835 INFO L87 Difference]: Start difference. First operand 378 states and 447 transitions. Second operand has 41 states, 41 states have (on average 1.7073170731707317) internal successors, (70), 40 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 04:02:05,039 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 04:02:05,040 INFO L93 Difference]: Finished difference Result 811 states and 952 transitions. [2022-02-24 04:02:05,040 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2022-02-24 04:02:05,040 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.7073170731707317) internal successors, (70), 40 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 76 [2022-02-24 04:02:05,040 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 04:02:05,041 INFO L225 Difference]: With dead ends: 811 [2022-02-24 04:02:05,041 INFO L226 Difference]: Without dead ends: 445 [2022-02-24 04:02:05,041 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 14 SyntacticMatches, 20 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 727 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=249, Invalid=1731, Unknown=0, NotChecked=0, Total=1980 [2022-02-24 04:02:05,041 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 122 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 2193 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 123 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 2218 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 2193 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-02-24 04:02:05,041 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [123 Valid, 39 Invalid, 2218 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 2193 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2022-02-24 04:02:05,042 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 445 states. [2022-02-24 04:02:06,886 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 445 to 378. [2022-02-24 04:02:06,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 378 states, 368 states have (on average 1.184782608695652) internal successors, (436), 369 states have internal predecessors, (436), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 04:02:06,887 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 378 states to 378 states and 447 transitions. [2022-02-24 04:02:06,887 INFO L78 Accepts]: Start accepts. Automaton has 378 states and 447 transitions. Word has length 76 [2022-02-24 04:02:06,887 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 04:02:06,887 INFO L470 AbstractCegarLoop]: Abstraction has 378 states and 447 transitions. [2022-02-24 04:02:06,887 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 1.7073170731707317) internal successors, (70), 40 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 04:02:06,887 INFO L276 IsEmpty]: Start isEmpty. Operand 378 states and 447 transitions. [2022-02-24 04:02:06,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2022-02-24 04:02:06,888 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 04:02:06,888 INFO L514 BasicCegarLoop]: trace histogram [18, 18, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 04:02:06,888 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable192 [2022-02-24 04:02:06,888 INFO L402 AbstractCegarLoop]: === Iteration 194 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 04:02:06,888 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 04:02:06,888 INFO L85 PathProgramCache]: Analyzing trace with hash -1310099204, now seen corresponding path program 153 times [2022-02-24 04:02:06,888 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 04:02:06,888 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1464671867] [2022-02-24 04:02:06,888 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 04:02:06,888 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 04:02:06,950 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 04:02:07,126 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 04:02:07,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:02:07,286 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 04:02:07,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:02:07,289 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 04:02:07,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:02:07,290 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 04:02:09,136 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 04:02:09,136 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1464671867] [2022-02-24 04:02:09,136 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1464671867] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 04:02:09,136 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 04:02:09,136 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [42] imperfect sequences [] total 42 [2022-02-24 04:02:09,136 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1721243345] [2022-02-24 04:02:09,136 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 04:02:09,136 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2022-02-24 04:02:09,136 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 04:02:09,137 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2022-02-24 04:02:09,137 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=215, Invalid=1677, Unknown=0, NotChecked=0, Total=1892 [2022-02-24 04:02:09,137 INFO L87 Difference]: Start difference. First operand 378 states and 447 transitions. Second operand has 42 states, 42 states have (on average 1.6666666666666667) internal successors, (70), 41 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 04:02:13,523 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 04:02:13,523 INFO L93 Difference]: Finished difference Result 811 states and 955 transitions. [2022-02-24 04:02:13,524 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2022-02-24 04:02:13,524 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 1.6666666666666667) internal successors, (70), 41 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 76 [2022-02-24 04:02:13,524 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 04:02:13,524 INFO L225 Difference]: With dead ends: 811 [2022-02-24 04:02:13,524 INFO L226 Difference]: Without dead ends: 445 [2022-02-24 04:02:13,525 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 14 SyntacticMatches, 19 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 685 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=259, Invalid=1811, Unknown=0, NotChecked=0, Total=2070 [2022-02-24 04:02:13,525 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 137 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 2568 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 138 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 2594 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 2568 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2022-02-24 04:02:13,525 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [138 Valid, 37 Invalid, 2594 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 2568 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2022-02-24 04:02:13,525 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 445 states. [2022-02-24 04:02:15,280 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 445 to 381. [2022-02-24 04:02:15,280 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 381 states, 371 states have (on average 1.1913746630727762) internal successors, (442), 372 states have internal predecessors, (442), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 04:02:15,281 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 381 states to 381 states and 453 transitions. [2022-02-24 04:02:15,281 INFO L78 Accepts]: Start accepts. Automaton has 381 states and 453 transitions. Word has length 76 [2022-02-24 04:02:15,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 04:02:15,281 INFO L470 AbstractCegarLoop]: Abstraction has 381 states and 453 transitions. [2022-02-24 04:02:15,281 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 1.6666666666666667) internal successors, (70), 41 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 04:02:15,281 INFO L276 IsEmpty]: Start isEmpty. Operand 381 states and 453 transitions. [2022-02-24 04:02:15,282 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2022-02-24 04:02:15,282 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 04:02:15,282 INFO L514 BasicCegarLoop]: trace histogram [18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 04:02:15,282 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable193 [2022-02-24 04:02:15,282 INFO L402 AbstractCegarLoop]: === Iteration 195 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 04:02:15,282 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 04:02:15,282 INFO L85 PathProgramCache]: Analyzing trace with hash -1475639554, now seen corresponding path program 18 times [2022-02-24 04:02:15,282 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 04:02:15,282 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [176460954] [2022-02-24 04:02:15,282 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 04:02:15,283 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 04:02:15,349 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 04:02:15,400 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 04:02:15,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:02:15,442 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 04:02:15,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:02:15,444 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 04:02:15,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:02:15,445 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 04:02:17,047 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 04:02:17,047 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [176460954] [2022-02-24 04:02:17,047 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [176460954] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 04:02:17,047 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 04:02:17,047 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [41] imperfect sequences [] total 41 [2022-02-24 04:02:17,047 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1085765494] [2022-02-24 04:02:17,047 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 04:02:17,048 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2022-02-24 04:02:17,048 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 04:02:17,048 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2022-02-24 04:02:17,048 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=1584, Unknown=0, NotChecked=0, Total=1722 [2022-02-24 04:02:17,048 INFO L87 Difference]: Start difference. First operand 381 states and 453 transitions. Second operand has 41 states, 41 states have (on average 1.7073170731707317) internal successors, (70), 40 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 04:02:22,161 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 04:02:22,162 INFO L93 Difference]: Finished difference Result 817 states and 967 transitions. [2022-02-24 04:02:22,165 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2022-02-24 04:02:22,165 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.7073170731707317) internal successors, (70), 40 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 76 [2022-02-24 04:02:22,165 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 04:02:22,166 INFO L225 Difference]: With dead ends: 817 [2022-02-24 04:02:22,166 INFO L226 Difference]: Without dead ends: 448 [2022-02-24 04:02:22,166 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 13 SyntacticMatches, 19 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 553 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=142, Invalid=1664, Unknown=0, NotChecked=0, Total=1806 [2022-02-24 04:02:22,166 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 85 mSDsluCounter, 41 mSDsCounter, 0 mSdLazyCounter, 3397 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 86 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 3402 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 3397 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2022-02-24 04:02:22,166 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [86 Valid, 62 Invalid, 3402 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 3397 Invalid, 0 Unknown, 0 Unchecked, 2.3s Time] [2022-02-24 04:02:22,167 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 448 states. [2022-02-24 04:02:23,941 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 448 to 387. [2022-02-24 04:02:23,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 387 states, 377 states have (on average 1.1883289124668435) internal successors, (448), 378 states have internal predecessors, (448), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 04:02:23,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 387 states to 387 states and 459 transitions. [2022-02-24 04:02:23,941 INFO L78 Accepts]: Start accepts. Automaton has 387 states and 459 transitions. Word has length 76 [2022-02-24 04:02:23,942 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 04:02:23,942 INFO L470 AbstractCegarLoop]: Abstraction has 387 states and 459 transitions. [2022-02-24 04:02:23,942 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 1.7073170731707317) internal successors, (70), 40 states have internal predecessors, (70), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 04:02:23,942 INFO L276 IsEmpty]: Start isEmpty. Operand 387 states and 459 transitions. [2022-02-24 04:02:23,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-02-24 04:02:23,942 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 04:02:23,942 INFO L514 BasicCegarLoop]: trace histogram [19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 04:02:23,942 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable194 [2022-02-24 04:02:23,942 INFO L402 AbstractCegarLoop]: === Iteration 196 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 04:02:23,942 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 04:02:23,942 INFO L85 PathProgramCache]: Analyzing trace with hash -1820988291, now seen corresponding path program 19 times [2022-02-24 04:02:23,942 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 04:02:23,943 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1309554893] [2022-02-24 04:02:23,943 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 04:02:23,943 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 04:02:24,058 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 04:02:24,167 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-24 04:02:24,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:02:24,223 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 04:02:24,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:02:24,225 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 04:02:24,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:02:24,227 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 04:02:25,432 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 04:02:25,432 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1309554893] [2022-02-24 04:02:25,432 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1309554893] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 04:02:25,432 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 04:02:25,432 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [] total 26 [2022-02-24 04:02:25,432 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1860723033] [2022-02-24 04:02:25,432 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 04:02:25,433 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-02-24 04:02:25,433 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 04:02:25,433 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-02-24 04:02:25,433 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=607, Unknown=0, NotChecked=0, Total=702 [2022-02-24 04:02:25,433 INFO L87 Difference]: Start difference. First operand 387 states and 459 transitions. Second operand has 26 states, 26 states have (on average 2.8076923076923075) internal successors, (73), 25 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 04:02:30,051 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 04:02:30,051 INFO L93 Difference]: Finished difference Result 928 states and 1075 transitions. [2022-02-24 04:02:30,052 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-02-24 04:02:30,052 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.8076923076923075) internal successors, (73), 25 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 79 [2022-02-24 04:02:30,052 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 04:02:30,052 INFO L225 Difference]: With dead ends: 928 [2022-02-24 04:02:30,052 INFO L226 Difference]: Without dead ends: 553 [2022-02-24 04:02:30,053 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 15 SyntacticMatches, 38 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 139 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=99, Invalid=657, Unknown=0, NotChecked=0, Total=756 [2022-02-24 04:02:30,053 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 37 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 1911 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 1921 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1911 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-02-24 04:02:30,053 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 58 Invalid, 1921 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 1911 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-02-24 04:02:30,053 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 553 states. [2022-02-24 04:02:32,014 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 553 to 396. [2022-02-24 04:02:32,014 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 396 states, 386 states have (on average 1.1839378238341969) internal successors, (457), 387 states have internal predecessors, (457), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 04:02:32,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 396 states to 396 states and 468 transitions. [2022-02-24 04:02:32,015 INFO L78 Accepts]: Start accepts. Automaton has 396 states and 468 transitions. Word has length 79 [2022-02-24 04:02:32,015 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 04:02:32,015 INFO L470 AbstractCegarLoop]: Abstraction has 396 states and 468 transitions. [2022-02-24 04:02:32,015 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 2.8076923076923075) internal successors, (73), 25 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 04:02:32,015 INFO L276 IsEmpty]: Start isEmpty. Operand 396 states and 468 transitions. [2022-02-24 04:02:32,015 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-02-24 04:02:32,015 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 04:02:32,015 INFO L514 BasicCegarLoop]: trace histogram [19, 19, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 04:02:32,016 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable195 [2022-02-24 04:02:32,016 INFO L402 AbstractCegarLoop]: === Iteration 197 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 04:02:32,016 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 04:02:32,016 INFO L85 PathProgramCache]: Analyzing trace with hash 787799167, now seen corresponding path program 154 times [2022-02-24 04:02:32,016 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 04:02:32,016 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1794801170] [2022-02-24 04:02:32,016 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 04:02:32,016 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 04:02:32,175 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 04:02:32,334 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 04:02:32,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:02:32,460 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 04:02:32,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:02:32,463 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 04:02:32,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:02:32,464 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 04:02:33,770 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 04:02:33,771 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1794801170] [2022-02-24 04:02:33,771 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1794801170] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 04:02:33,771 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 04:02:33,771 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2022-02-24 04:02:33,771 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [312071230] [2022-02-24 04:02:33,771 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 04:02:33,771 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-02-24 04:02:33,771 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 04:02:33,771 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-02-24 04:02:33,771 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=722, Unknown=0, NotChecked=0, Total=812 [2022-02-24 04:02:33,771 INFO L87 Difference]: Start difference. First operand 396 states and 468 transitions. Second operand has 27 states, 27 states have (on average 2.7037037037037037) internal successors, (73), 26 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 04:02:38,717 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 04:02:38,717 INFO L93 Difference]: Finished difference Result 946 states and 1093 transitions. [2022-02-24 04:02:38,720 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-02-24 04:02:38,721 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 2.7037037037037037) internal successors, (73), 26 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 79 [2022-02-24 04:02:38,721 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 04:02:38,721 INFO L225 Difference]: With dead ends: 946 [2022-02-24 04:02:38,721 INFO L226 Difference]: Without dead ends: 562 [2022-02-24 04:02:38,722 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 14 SyntacticMatches, 37 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 292 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=102, Invalid=828, Unknown=0, NotChecked=0, Total=930 [2022-02-24 04:02:38,722 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 39 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 1951 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 60 SdHoareTripleChecker+Invalid, 1961 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1951 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-02-24 04:02:38,722 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 60 Invalid, 1961 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 1951 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-02-24 04:02:38,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 562 states. [2022-02-24 04:02:40,742 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 562 to 396. [2022-02-24 04:02:40,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 396 states, 386 states have (on average 1.1839378238341969) internal successors, (457), 387 states have internal predecessors, (457), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 04:02:40,743 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 396 states to 396 states and 468 transitions. [2022-02-24 04:02:40,743 INFO L78 Accepts]: Start accepts. Automaton has 396 states and 468 transitions. Word has length 79 [2022-02-24 04:02:40,743 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 04:02:40,743 INFO L470 AbstractCegarLoop]: Abstraction has 396 states and 468 transitions. [2022-02-24 04:02:40,743 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 2.7037037037037037) internal successors, (73), 26 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 04:02:40,743 INFO L276 IsEmpty]: Start isEmpty. Operand 396 states and 468 transitions. [2022-02-24 04:02:40,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-02-24 04:02:40,743 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 04:02:40,744 INFO L514 BasicCegarLoop]: trace histogram [19, 19, 17, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 04:02:40,744 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable196 [2022-02-24 04:02:40,744 INFO L402 AbstractCegarLoop]: === Iteration 198 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 04:02:40,744 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 04:02:40,744 INFO L85 PathProgramCache]: Analyzing trace with hash 1467071421, now seen corresponding path program 155 times [2022-02-24 04:02:40,744 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 04:02:40,744 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1824775184] [2022-02-24 04:02:40,744 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 04:02:40,744 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 04:02:40,900 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 04:02:41,080 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 04:02:41,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:02:41,233 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 04:02:41,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:02:41,236 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 04:02:41,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:02:41,238 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 04:02:42,649 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 04:02:42,649 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1824775184] [2022-02-24 04:02:42,649 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1824775184] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 04:02:42,649 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 04:02:42,649 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [] total 28 [2022-02-24 04:02:42,649 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2090957912] [2022-02-24 04:02:42,649 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 04:02:42,649 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-02-24 04:02:42,649 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 04:02:42,649 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-02-24 04:02:42,650 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=772, Unknown=0, NotChecked=0, Total=870 [2022-02-24 04:02:42,650 INFO L87 Difference]: Start difference. First operand 396 states and 468 transitions. Second operand has 28 states, 28 states have (on average 2.607142857142857) internal successors, (73), 27 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 04:02:47,594 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 04:02:47,594 INFO L93 Difference]: Finished difference Result 940 states and 1087 transitions. [2022-02-24 04:02:47,594 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-02-24 04:02:47,594 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 2.607142857142857) internal successors, (73), 27 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 79 [2022-02-24 04:02:47,595 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 04:02:47,595 INFO L225 Difference]: With dead ends: 940 [2022-02-24 04:02:47,595 INFO L226 Difference]: Without dead ends: 556 [2022-02-24 04:02:47,595 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 14 SyntacticMatches, 36 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 391 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=112, Invalid=880, Unknown=0, NotChecked=0, Total=992 [2022-02-24 04:02:47,596 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 46 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 2008 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 65 SdHoareTripleChecker+Invalid, 2019 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 2008 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-02-24 04:02:47,596 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [47 Valid, 65 Invalid, 2019 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 2008 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-02-24 04:02:47,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 556 states. [2022-02-24 04:02:49,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 556 to 396. [2022-02-24 04:02:49,651 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 396 states, 386 states have (on average 1.1839378238341969) internal successors, (457), 387 states have internal predecessors, (457), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 04:02:49,651 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 396 states to 396 states and 468 transitions. [2022-02-24 04:02:49,651 INFO L78 Accepts]: Start accepts. Automaton has 396 states and 468 transitions. Word has length 79 [2022-02-24 04:02:49,652 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 04:02:49,652 INFO L470 AbstractCegarLoop]: Abstraction has 396 states and 468 transitions. [2022-02-24 04:02:49,652 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 2.607142857142857) internal successors, (73), 27 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 04:02:49,652 INFO L276 IsEmpty]: Start isEmpty. Operand 396 states and 468 transitions. [2022-02-24 04:02:49,652 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-02-24 04:02:49,652 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 04:02:49,652 INFO L514 BasicCegarLoop]: trace histogram [19, 19, 16, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 04:02:49,652 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable197 [2022-02-24 04:02:49,652 INFO L402 AbstractCegarLoop]: === Iteration 199 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 04:02:49,652 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 04:02:49,652 INFO L85 PathProgramCache]: Analyzing trace with hash 2027771199, now seen corresponding path program 156 times [2022-02-24 04:02:49,652 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 04:02:49,652 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [120564847] [2022-02-24 04:02:49,653 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 04:02:49,653 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 04:02:49,808 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 04:02:49,968 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 04:02:49,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:02:50,102 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 04:02:50,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:02:50,105 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 04:02:50,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:02:50,106 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 04:02:51,513 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 04:02:51,513 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [120564847] [2022-02-24 04:02:51,513 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [120564847] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 04:02:51,513 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 04:02:51,513 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2022-02-24 04:02:51,513 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1976017390] [2022-02-24 04:02:51,513 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 04:02:51,513 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-02-24 04:02:51,513 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 04:02:51,513 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-02-24 04:02:51,514 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=824, Unknown=0, NotChecked=0, Total=930 [2022-02-24 04:02:51,514 INFO L87 Difference]: Start difference. First operand 396 states and 468 transitions. Second operand has 29 states, 29 states have (on average 2.5172413793103448) internal successors, (73), 28 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 04:02:56,633 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 04:02:56,634 INFO L93 Difference]: Finished difference Result 934 states and 1081 transitions. [2022-02-24 04:02:56,634 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-02-24 04:02:56,634 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 2.5172413793103448) internal successors, (73), 28 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 79 [2022-02-24 04:02:56,634 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 04:02:56,634 INFO L225 Difference]: With dead ends: 934 [2022-02-24 04:02:56,635 INFO L226 Difference]: Without dead ends: 550 [2022-02-24 04:02:56,635 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 14 SyntacticMatches, 35 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 481 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=122, Invalid=934, Unknown=0, NotChecked=0, Total=1056 [2022-02-24 04:02:56,635 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 50 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 2149 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 68 SdHoareTripleChecker+Invalid, 2161 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 2149 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-02-24 04:02:56,635 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [51 Valid, 68 Invalid, 2161 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 2149 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2022-02-24 04:02:56,636 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 550 states. [2022-02-24 04:02:58,696 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 550 to 396. [2022-02-24 04:02:58,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 396 states, 386 states have (on average 1.1839378238341969) internal successors, (457), 387 states have internal predecessors, (457), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 04:02:58,697 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 396 states to 396 states and 468 transitions. [2022-02-24 04:02:58,697 INFO L78 Accepts]: Start accepts. Automaton has 396 states and 468 transitions. Word has length 79 [2022-02-24 04:02:58,697 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 04:02:58,697 INFO L470 AbstractCegarLoop]: Abstraction has 396 states and 468 transitions. [2022-02-24 04:02:58,697 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 2.5172413793103448) internal successors, (73), 28 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 04:02:58,697 INFO L276 IsEmpty]: Start isEmpty. Operand 396 states and 468 transitions. [2022-02-24 04:02:58,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-02-24 04:02:58,698 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 04:02:58,698 INFO L514 BasicCegarLoop]: trace histogram [19, 19, 15, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 04:02:58,698 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable198 [2022-02-24 04:02:58,698 INFO L402 AbstractCegarLoop]: === Iteration 200 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 04:02:58,698 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 04:02:58,698 INFO L85 PathProgramCache]: Analyzing trace with hash 2068445949, now seen corresponding path program 157 times [2022-02-24 04:02:58,698 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 04:02:58,698 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1640560667] [2022-02-24 04:02:58,698 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 04:02:58,698 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 04:02:58,857 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 04:02:59,016 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 04:02:59,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:02:59,154 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 04:02:59,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:02:59,161 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 04:02:59,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:02:59,163 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 04:03:00,591 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 04:03:00,591 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1640560667] [2022-02-24 04:03:00,592 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1640560667] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 04:03:00,592 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 04:03:00,592 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [] total 30 [2022-02-24 04:03:00,592 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1115240141] [2022-02-24 04:03:00,592 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 04:03:00,592 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-02-24 04:03:00,592 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 04:03:00,592 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-02-24 04:03:00,592 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=878, Unknown=0, NotChecked=0, Total=992 [2022-02-24 04:03:00,592 INFO L87 Difference]: Start difference. First operand 396 states and 468 transitions. Second operand has 30 states, 30 states have (on average 2.433333333333333) internal successors, (73), 29 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 04:03:05,708 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 04:03:05,708 INFO L93 Difference]: Finished difference Result 928 states and 1075 transitions. [2022-02-24 04:03:05,709 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-02-24 04:03:05,709 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 2.433333333333333) internal successors, (73), 29 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 79 [2022-02-24 04:03:05,709 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 04:03:05,709 INFO L225 Difference]: With dead ends: 928 [2022-02-24 04:03:05,709 INFO L226 Difference]: Without dead ends: 544 [2022-02-24 04:03:05,710 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 14 SyntacticMatches, 34 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 562 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=132, Invalid=990, Unknown=0, NotChecked=0, Total=1122 [2022-02-24 04:03:05,710 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 54 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 2216 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 65 SdHoareTripleChecker+Invalid, 2229 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 2216 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-02-24 04:03:05,710 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [55 Valid, 65 Invalid, 2229 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 2216 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2022-02-24 04:03:05,712 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 544 states. [2022-02-24 04:03:07,803 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 544 to 396. [2022-02-24 04:03:07,803 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 396 states, 386 states have (on average 1.1839378238341969) internal successors, (457), 387 states have internal predecessors, (457), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 04:03:07,804 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 396 states to 396 states and 468 transitions. [2022-02-24 04:03:07,804 INFO L78 Accepts]: Start accepts. Automaton has 396 states and 468 transitions. Word has length 79 [2022-02-24 04:03:07,804 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 04:03:07,804 INFO L470 AbstractCegarLoop]: Abstraction has 396 states and 468 transitions. [2022-02-24 04:03:07,804 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 2.433333333333333) internal successors, (73), 29 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 04:03:07,804 INFO L276 IsEmpty]: Start isEmpty. Operand 396 states and 468 transitions. [2022-02-24 04:03:07,804 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-02-24 04:03:07,804 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 04:03:07,804 INFO L514 BasicCegarLoop]: trace histogram [19, 19, 14, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 04:03:07,804 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable199 [2022-02-24 04:03:07,804 INFO L402 AbstractCegarLoop]: === Iteration 201 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 04:03:07,805 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 04:03:07,805 INFO L85 PathProgramCache]: Analyzing trace with hash -1782620673, now seen corresponding path program 158 times [2022-02-24 04:03:07,805 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 04:03:07,805 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [708237504] [2022-02-24 04:03:07,805 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 04:03:07,805 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 04:03:08,006 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 04:03:08,171 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 04:03:08,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:03:08,302 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 04:03:08,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:03:08,305 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 04:03:08,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:03:08,306 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 04:03:09,794 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 04:03:09,794 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [708237504] [2022-02-24 04:03:09,794 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [708237504] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 04:03:09,794 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 04:03:09,794 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2022-02-24 04:03:09,794 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1578180484] [2022-02-24 04:03:09,794 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 04:03:09,794 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-02-24 04:03:09,794 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 04:03:09,794 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-02-24 04:03:09,795 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=934, Unknown=0, NotChecked=0, Total=1056 [2022-02-24 04:03:09,795 INFO L87 Difference]: Start difference. First operand 396 states and 468 transitions. Second operand has 31 states, 31 states have (on average 2.3548387096774195) internal successors, (73), 30 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 04:03:15,089 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 04:03:15,089 INFO L93 Difference]: Finished difference Result 922 states and 1069 transitions. [2022-02-24 04:03:15,092 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2022-02-24 04:03:15,092 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 2.3548387096774195) internal successors, (73), 30 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 79 [2022-02-24 04:03:15,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 04:03:15,093 INFO L225 Difference]: With dead ends: 922 [2022-02-24 04:03:15,093 INFO L226 Difference]: Without dead ends: 538 [2022-02-24 04:03:15,094 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 14 SyntacticMatches, 33 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 634 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=142, Invalid=1048, Unknown=0, NotChecked=0, Total=1190 [2022-02-24 04:03:15,094 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 52 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 2317 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 69 SdHoareTripleChecker+Invalid, 2331 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 2317 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-02-24 04:03:15,094 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [53 Valid, 69 Invalid, 2331 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 2317 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2022-02-24 04:03:15,094 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 538 states. [2022-02-24 04:03:17,183 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 538 to 396. [2022-02-24 04:03:17,184 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 396 states, 386 states have (on average 1.1839378238341969) internal successors, (457), 387 states have internal predecessors, (457), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 04:03:17,184 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 396 states to 396 states and 468 transitions. [2022-02-24 04:03:17,184 INFO L78 Accepts]: Start accepts. Automaton has 396 states and 468 transitions. Word has length 79 [2022-02-24 04:03:17,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 04:03:17,185 INFO L470 AbstractCegarLoop]: Abstraction has 396 states and 468 transitions. [2022-02-24 04:03:17,185 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 2.3548387096774195) internal successors, (73), 30 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 04:03:17,185 INFO L276 IsEmpty]: Start isEmpty. Operand 396 states and 468 transitions. [2022-02-24 04:03:17,185 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-02-24 04:03:17,185 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 04:03:17,185 INFO L514 BasicCegarLoop]: trace histogram [19, 19, 13, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 04:03:17,185 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable200 [2022-02-24 04:03:17,185 INFO L402 AbstractCegarLoop]: === Iteration 202 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 04:03:17,185 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 04:03:17,185 INFO L85 PathProgramCache]: Analyzing trace with hash 2031266365, now seen corresponding path program 159 times [2022-02-24 04:03:17,185 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 04:03:17,185 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [657557123] [2022-02-24 04:03:17,185 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 04:03:17,186 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 04:03:17,345 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 04:03:17,503 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 04:03:17,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:03:17,635 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 04:03:17,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:03:17,638 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 04:03:17,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:03:17,639 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 04:03:19,106 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 04:03:19,106 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [657557123] [2022-02-24 04:03:19,106 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [657557123] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 04:03:19,106 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 04:03:19,106 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [32] imperfect sequences [] total 32 [2022-02-24 04:03:19,106 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1051524551] [2022-02-24 04:03:19,106 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 04:03:19,107 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-02-24 04:03:19,107 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 04:03:19,107 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-02-24 04:03:19,107 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=992, Unknown=0, NotChecked=0, Total=1122 [2022-02-24 04:03:19,107 INFO L87 Difference]: Start difference. First operand 396 states and 468 transitions. Second operand has 32 states, 32 states have (on average 2.28125) internal successors, (73), 31 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 04:03:24,264 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 04:03:24,264 INFO L93 Difference]: Finished difference Result 916 states and 1063 transitions. [2022-02-24 04:03:24,265 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-02-24 04:03:24,265 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 2.28125) internal successors, (73), 31 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 79 [2022-02-24 04:03:24,265 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 04:03:24,265 INFO L225 Difference]: With dead ends: 916 [2022-02-24 04:03:24,265 INFO L226 Difference]: Without dead ends: 532 [2022-02-24 04:03:24,266 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 14 SyntacticMatches, 32 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 697 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=152, Invalid=1108, Unknown=0, NotChecked=0, Total=1260 [2022-02-24 04:03:24,266 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 68 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 2181 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 2196 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 2181 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2022-02-24 04:03:24,266 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [69 Valid, 55 Invalid, 2196 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 2181 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2022-02-24 04:03:24,266 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 532 states. [2022-02-24 04:03:26,438 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 532 to 396. [2022-02-24 04:03:26,438 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 396 states, 386 states have (on average 1.1839378238341969) internal successors, (457), 387 states have internal predecessors, (457), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 04:03:26,439 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 396 states to 396 states and 468 transitions. [2022-02-24 04:03:26,439 INFO L78 Accepts]: Start accepts. Automaton has 396 states and 468 transitions. Word has length 79 [2022-02-24 04:03:26,439 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 04:03:26,439 INFO L470 AbstractCegarLoop]: Abstraction has 396 states and 468 transitions. [2022-02-24 04:03:26,439 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 2.28125) internal successors, (73), 31 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 04:03:26,439 INFO L276 IsEmpty]: Start isEmpty. Operand 396 states and 468 transitions. [2022-02-24 04:03:26,439 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-02-24 04:03:26,439 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 04:03:26,439 INFO L514 BasicCegarLoop]: trace histogram [19, 19, 12, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 04:03:26,439 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable201 [2022-02-24 04:03:26,440 INFO L402 AbstractCegarLoop]: === Iteration 203 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 04:03:26,440 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 04:03:26,440 INFO L85 PathProgramCache]: Analyzing trace with hash 1678177983, now seen corresponding path program 160 times [2022-02-24 04:03:26,440 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 04:03:26,440 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [659809356] [2022-02-24 04:03:26,440 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 04:03:26,440 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 04:03:26,601 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 04:03:26,766 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 04:03:26,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:03:26,917 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 04:03:26,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:03:26,919 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 04:03:26,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:03:26,920 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 04:03:28,550 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 04:03:28,550 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [659809356] [2022-02-24 04:03:28,550 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [659809356] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 04:03:28,550 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 04:03:28,550 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2022-02-24 04:03:28,550 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1838333467] [2022-02-24 04:03:28,550 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 04:03:28,551 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-02-24 04:03:28,551 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 04:03:28,551 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-02-24 04:03:28,551 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=1052, Unknown=0, NotChecked=0, Total=1190 [2022-02-24 04:03:28,551 INFO L87 Difference]: Start difference. First operand 396 states and 468 transitions. Second operand has 33 states, 33 states have (on average 2.212121212121212) internal successors, (73), 32 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 04:03:33,785 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 04:03:33,786 INFO L93 Difference]: Finished difference Result 910 states and 1057 transitions. [2022-02-24 04:03:33,786 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-02-24 04:03:33,786 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 2.212121212121212) internal successors, (73), 32 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 79 [2022-02-24 04:03:33,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 04:03:33,787 INFO L225 Difference]: With dead ends: 910 [2022-02-24 04:03:33,787 INFO L226 Difference]: Without dead ends: 526 [2022-02-24 04:03:33,787 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 14 SyntacticMatches, 31 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 751 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=162, Invalid=1170, Unknown=0, NotChecked=0, Total=1332 [2022-02-24 04:03:33,787 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 68 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 2340 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 50 SdHoareTripleChecker+Invalid, 2356 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 2340 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-02-24 04:03:33,787 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [69 Valid, 50 Invalid, 2356 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 2340 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2022-02-24 04:03:33,788 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 526 states. [2022-02-24 04:03:35,990 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 526 to 396. [2022-02-24 04:03:35,990 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 396 states, 386 states have (on average 1.1839378238341969) internal successors, (457), 387 states have internal predecessors, (457), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 04:03:35,991 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 396 states to 396 states and 468 transitions. [2022-02-24 04:03:35,991 INFO L78 Accepts]: Start accepts. Automaton has 396 states and 468 transitions. Word has length 79 [2022-02-24 04:03:35,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 04:03:35,991 INFO L470 AbstractCegarLoop]: Abstraction has 396 states and 468 transitions. [2022-02-24 04:03:35,991 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 2.212121212121212) internal successors, (73), 32 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 04:03:35,991 INFO L276 IsEmpty]: Start isEmpty. Operand 396 states and 468 transitions. [2022-02-24 04:03:35,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-02-24 04:03:35,992 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 04:03:35,992 INFO L514 BasicCegarLoop]: trace histogram [19, 19, 11, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 04:03:35,992 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable202 [2022-02-24 04:03:35,992 INFO L402 AbstractCegarLoop]: === Iteration 204 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 04:03:35,992 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 04:03:35,992 INFO L85 PathProgramCache]: Analyzing trace with hash -371209859, now seen corresponding path program 161 times [2022-02-24 04:03:35,992 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 04:03:35,992 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [741498867] [2022-02-24 04:03:35,992 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 04:03:35,992 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 04:03:36,159 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 04:03:36,328 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 04:03:36,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:03:36,463 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 04:03:36,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:03:36,466 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 04:03:36,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:03:36,467 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 04:03:38,079 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 04:03:38,080 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [741498867] [2022-02-24 04:03:38,080 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [741498867] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 04:03:38,080 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 04:03:38,080 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [34] imperfect sequences [] total 34 [2022-02-24 04:03:38,080 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [742565792] [2022-02-24 04:03:38,080 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 04:03:38,080 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2022-02-24 04:03:38,080 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 04:03:38,080 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2022-02-24 04:03:38,080 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=146, Invalid=1114, Unknown=0, NotChecked=0, Total=1260 [2022-02-24 04:03:38,081 INFO L87 Difference]: Start difference. First operand 396 states and 468 transitions. Second operand has 34 states, 34 states have (on average 2.1470588235294117) internal successors, (73), 33 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 04:03:43,522 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 04:03:43,522 INFO L93 Difference]: Finished difference Result 904 states and 1051 transitions. [2022-02-24 04:03:43,525 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-02-24 04:03:43,525 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 2.1470588235294117) internal successors, (73), 33 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 79 [2022-02-24 04:03:43,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 04:03:43,526 INFO L225 Difference]: With dead ends: 904 [2022-02-24 04:03:43,526 INFO L226 Difference]: Without dead ends: 520 [2022-02-24 04:03:43,526 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 14 SyntacticMatches, 30 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 796 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=172, Invalid=1234, Unknown=0, NotChecked=0, Total=1406 [2022-02-24 04:03:43,526 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 69 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 2758 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 2775 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 2758 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2022-02-24 04:03:43,526 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [70 Valid, 61 Invalid, 2775 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 2758 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2022-02-24 04:03:43,528 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 520 states. [2022-02-24 04:03:45,726 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 520 to 396. [2022-02-24 04:03:45,726 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 396 states, 386 states have (on average 1.1839378238341969) internal successors, (457), 387 states have internal predecessors, (457), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 04:03:45,727 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 396 states to 396 states and 468 transitions. [2022-02-24 04:03:45,727 INFO L78 Accepts]: Start accepts. Automaton has 396 states and 468 transitions. Word has length 79 [2022-02-24 04:03:45,727 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 04:03:45,727 INFO L470 AbstractCegarLoop]: Abstraction has 396 states and 468 transitions. [2022-02-24 04:03:45,727 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 2.1470588235294117) internal successors, (73), 33 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 04:03:45,727 INFO L276 IsEmpty]: Start isEmpty. Operand 396 states and 468 transitions. [2022-02-24 04:03:45,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-02-24 04:03:45,727 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 04:03:45,727 INFO L514 BasicCegarLoop]: trace histogram [19, 19, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 04:03:45,727 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable203 [2022-02-24 04:03:45,728 INFO L402 AbstractCegarLoop]: === Iteration 205 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 04:03:45,728 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 04:03:45,728 INFO L85 PathProgramCache]: Analyzing trace with hash 52436863, now seen corresponding path program 162 times [2022-02-24 04:03:45,728 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 04:03:45,728 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [894750985] [2022-02-24 04:03:45,728 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 04:03:45,728 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 04:03:45,902 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 04:03:46,068 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 04:03:46,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:03:46,206 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 04:03:46,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:03:46,209 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 04:03:46,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:03:46,210 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 04:03:47,900 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 04:03:47,900 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [894750985] [2022-02-24 04:03:47,900 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [894750985] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 04:03:47,900 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 04:03:47,900 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2022-02-24 04:03:47,900 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [374972785] [2022-02-24 04:03:47,900 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 04:03:47,900 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-02-24 04:03:47,900 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 04:03:47,901 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-02-24 04:03:47,901 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=154, Invalid=1178, Unknown=0, NotChecked=0, Total=1332 [2022-02-24 04:03:47,901 INFO L87 Difference]: Start difference. First operand 396 states and 468 transitions. Second operand has 35 states, 35 states have (on average 2.085714285714286) internal successors, (73), 34 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 04:03:53,428 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 04:03:53,428 INFO L93 Difference]: Finished difference Result 898 states and 1045 transitions. [2022-02-24 04:03:53,431 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-02-24 04:03:53,431 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 2.085714285714286) internal successors, (73), 34 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 79 [2022-02-24 04:03:53,431 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 04:03:53,432 INFO L225 Difference]: With dead ends: 898 [2022-02-24 04:03:53,432 INFO L226 Difference]: Without dead ends: 514 [2022-02-24 04:03:53,432 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 14 SyntacticMatches, 29 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 832 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=182, Invalid=1300, Unknown=0, NotChecked=0, Total=1482 [2022-02-24 04:03:53,433 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 73 mSDsluCounter, 38 mSDsCounter, 0 mSdLazyCounter, 2812 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 59 SdHoareTripleChecker+Invalid, 2830 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 2812 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2022-02-24 04:03:53,433 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [74 Valid, 59 Invalid, 2830 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 2812 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2022-02-24 04:03:53,433 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 514 states. [2022-02-24 04:03:55,580 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 514 to 396. [2022-02-24 04:03:55,581 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 396 states, 386 states have (on average 1.1839378238341969) internal successors, (457), 387 states have internal predecessors, (457), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 04:03:55,581 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 396 states to 396 states and 468 transitions. [2022-02-24 04:03:55,581 INFO L78 Accepts]: Start accepts. Automaton has 396 states and 468 transitions. Word has length 79 [2022-02-24 04:03:55,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 04:03:55,581 INFO L470 AbstractCegarLoop]: Abstraction has 396 states and 468 transitions. [2022-02-24 04:03:55,581 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 2.085714285714286) internal successors, (73), 34 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 04:03:55,581 INFO L276 IsEmpty]: Start isEmpty. Operand 396 states and 468 transitions. [2022-02-24 04:03:55,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-02-24 04:03:55,582 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 04:03:55,582 INFO L514 BasicCegarLoop]: trace histogram [19, 19, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 04:03:55,582 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable204 [2022-02-24 04:03:55,582 INFO L402 AbstractCegarLoop]: === Iteration 206 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 04:03:55,582 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 04:03:55,582 INFO L85 PathProgramCache]: Analyzing trace with hash -976922435, now seen corresponding path program 163 times [2022-02-24 04:03:55,582 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 04:03:55,582 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [10930271] [2022-02-24 04:03:55,582 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 04:03:55,582 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 04:03:55,764 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 04:03:55,936 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 04:03:55,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:03:56,082 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 04:03:56,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:03:56,085 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 04:03:56,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:03:56,086 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 04:03:57,865 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 04:03:57,866 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [10930271] [2022-02-24 04:03:57,866 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [10930271] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 04:03:57,866 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 04:03:57,866 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [36] imperfect sequences [] total 36 [2022-02-24 04:03:57,866 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1062286] [2022-02-24 04:03:57,866 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 04:03:57,866 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-02-24 04:03:57,866 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 04:03:57,866 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-02-24 04:03:57,866 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=162, Invalid=1244, Unknown=0, NotChecked=0, Total=1406 [2022-02-24 04:03:57,866 INFO L87 Difference]: Start difference. First operand 396 states and 468 transitions. Second operand has 36 states, 36 states have (on average 2.0277777777777777) internal successors, (73), 35 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 04:04:03,091 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 04:04:03,091 INFO L93 Difference]: Finished difference Result 892 states and 1039 transitions. [2022-02-24 04:04:03,091 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-02-24 04:04:03,091 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 2.0277777777777777) internal successors, (73), 35 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 79 [2022-02-24 04:04:03,091 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 04:04:03,092 INFO L225 Difference]: With dead ends: 892 [2022-02-24 04:04:03,092 INFO L226 Difference]: Without dead ends: 508 [2022-02-24 04:04:03,092 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 14 SyntacticMatches, 28 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 859 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=192, Invalid=1368, Unknown=0, NotChecked=0, Total=1560 [2022-02-24 04:04:03,092 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 83 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 2404 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 84 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 2423 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 2404 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2022-02-24 04:04:03,092 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [84 Valid, 55 Invalid, 2423 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 2404 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2022-02-24 04:04:03,093 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 508 states. [2022-02-24 04:04:05,275 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 508 to 396. [2022-02-24 04:04:05,275 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 396 states, 386 states have (on average 1.1839378238341969) internal successors, (457), 387 states have internal predecessors, (457), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 04:04:05,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 396 states to 396 states and 468 transitions. [2022-02-24 04:04:05,276 INFO L78 Accepts]: Start accepts. Automaton has 396 states and 468 transitions. Word has length 79 [2022-02-24 04:04:05,276 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 04:04:05,276 INFO L470 AbstractCegarLoop]: Abstraction has 396 states and 468 transitions. [2022-02-24 04:04:05,276 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 2.0277777777777777) internal successors, (73), 35 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 04:04:05,276 INFO L276 IsEmpty]: Start isEmpty. Operand 396 states and 468 transitions. [2022-02-24 04:04:05,276 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-02-24 04:04:05,276 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 04:04:05,276 INFO L514 BasicCegarLoop]: trace histogram [19, 19, 11, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 04:04:05,277 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable205 [2022-02-24 04:04:05,277 INFO L402 AbstractCegarLoop]: === Iteration 207 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 04:04:05,277 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 04:04:05,277 INFO L85 PathProgramCache]: Analyzing trace with hash -1820927937, now seen corresponding path program 164 times [2022-02-24 04:04:05,277 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 04:04:05,277 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [163327400] [2022-02-24 04:04:05,277 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 04:04:05,277 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 04:04:05,445 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 04:04:05,608 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 04:04:05,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:04:05,746 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 04:04:05,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:04:05,749 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 04:04:05,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:04:05,750 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 04:04:07,500 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 04:04:07,500 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [163327400] [2022-02-24 04:04:07,500 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [163327400] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 04:04:07,500 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 04:04:07,500 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [37] imperfect sequences [] total 37 [2022-02-24 04:04:07,500 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1950718907] [2022-02-24 04:04:07,500 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 04:04:07,500 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2022-02-24 04:04:07,500 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 04:04:07,500 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2022-02-24 04:04:07,501 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=1312, Unknown=0, NotChecked=0, Total=1482 [2022-02-24 04:04:07,501 INFO L87 Difference]: Start difference. First operand 396 states and 468 transitions. Second operand has 37 states, 37 states have (on average 1.972972972972973) internal successors, (73), 36 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 04:04:12,851 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 04:04:12,851 INFO L93 Difference]: Finished difference Result 886 states and 1033 transitions. [2022-02-24 04:04:12,852 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-02-24 04:04:12,852 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 1.972972972972973) internal successors, (73), 36 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 79 [2022-02-24 04:04:12,852 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 04:04:12,852 INFO L225 Difference]: With dead ends: 886 [2022-02-24 04:04:12,852 INFO L226 Difference]: Without dead ends: 502 [2022-02-24 04:04:12,853 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 14 SyntacticMatches, 27 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 877 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=202, Invalid=1438, Unknown=0, NotChecked=0, Total=1640 [2022-02-24 04:04:12,853 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 77 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 2640 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 78 SdHoareTripleChecker+Valid, 69 SdHoareTripleChecker+Invalid, 2660 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 2640 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2022-02-24 04:04:12,853 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [78 Valid, 69 Invalid, 2660 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 2640 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2022-02-24 04:04:12,853 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 502 states. [2022-02-24 04:04:15,044 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 502 to 396. [2022-02-24 04:04:15,044 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 396 states, 386 states have (on average 1.1839378238341969) internal successors, (457), 387 states have internal predecessors, (457), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 04:04:15,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 396 states to 396 states and 468 transitions. [2022-02-24 04:04:15,045 INFO L78 Accepts]: Start accepts. Automaton has 396 states and 468 transitions. Word has length 79 [2022-02-24 04:04:15,045 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 04:04:15,045 INFO L470 AbstractCegarLoop]: Abstraction has 396 states and 468 transitions. [2022-02-24 04:04:15,045 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 1.972972972972973) internal successors, (73), 36 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 04:04:15,045 INFO L276 IsEmpty]: Start isEmpty. Operand 396 states and 468 transitions. [2022-02-24 04:04:15,045 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-02-24 04:04:15,045 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 04:04:15,045 INFO L514 BasicCegarLoop]: trace histogram [19, 19, 12, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 04:04:15,045 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable206 [2022-02-24 04:04:15,045 INFO L402 AbstractCegarLoop]: === Iteration 208 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 04:04:15,045 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 04:04:15,046 INFO L85 PathProgramCache]: Analyzing trace with hash -1546168323, now seen corresponding path program 165 times [2022-02-24 04:04:15,046 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 04:04:15,046 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1332071664] [2022-02-24 04:04:15,046 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 04:04:15,046 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 04:04:15,211 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 04:04:15,375 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 04:04:15,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:04:15,518 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 04:04:15,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:04:15,520 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 04:04:15,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:04:15,521 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 04:04:17,288 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 04:04:17,288 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1332071664] [2022-02-24 04:04:17,288 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1332071664] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 04:04:17,288 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 04:04:17,288 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [38] imperfect sequences [] total 38 [2022-02-24 04:04:17,288 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1123054566] [2022-02-24 04:04:17,288 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 04:04:17,288 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-02-24 04:04:17,288 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 04:04:17,288 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-02-24 04:04:17,289 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=178, Invalid=1382, Unknown=0, NotChecked=0, Total=1560 [2022-02-24 04:04:17,289 INFO L87 Difference]: Start difference. First operand 396 states and 468 transitions. Second operand has 38 states, 38 states have (on average 1.9210526315789473) internal successors, (73), 37 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 04:04:22,416 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 04:04:22,416 INFO L93 Difference]: Finished difference Result 880 states and 1027 transitions. [2022-02-24 04:04:22,416 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2022-02-24 04:04:22,416 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.9210526315789473) internal successors, (73), 37 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 79 [2022-02-24 04:04:22,416 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 04:04:22,417 INFO L225 Difference]: With dead ends: 880 [2022-02-24 04:04:22,417 INFO L226 Difference]: Without dead ends: 496 [2022-02-24 04:04:22,417 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 14 SyntacticMatches, 26 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 886 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=212, Invalid=1510, Unknown=0, NotChecked=0, Total=1722 [2022-02-24 04:04:22,417 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 82 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 2460 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 83 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 2481 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 2460 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2022-02-24 04:04:22,417 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [83 Valid, 61 Invalid, 2481 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 2460 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2022-02-24 04:04:22,418 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 496 states. [2022-02-24 04:04:24,652 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 496 to 396. [2022-02-24 04:04:24,652 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 396 states, 386 states have (on average 1.1839378238341969) internal successors, (457), 387 states have internal predecessors, (457), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 04:04:24,653 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 396 states to 396 states and 468 transitions. [2022-02-24 04:04:24,653 INFO L78 Accepts]: Start accepts. Automaton has 396 states and 468 transitions. Word has length 79 [2022-02-24 04:04:24,653 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 04:04:24,653 INFO L470 AbstractCegarLoop]: Abstraction has 396 states and 468 transitions. [2022-02-24 04:04:24,653 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 1.9210526315789473) internal successors, (73), 37 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 04:04:24,653 INFO L276 IsEmpty]: Start isEmpty. Operand 396 states and 468 transitions. [2022-02-24 04:04:24,653 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-02-24 04:04:24,653 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 04:04:24,654 INFO L514 BasicCegarLoop]: trace histogram [19, 19, 13, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 04:04:24,654 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable207 [2022-02-24 04:04:24,654 INFO L402 AbstractCegarLoop]: === Iteration 209 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 04:04:24,654 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 04:04:24,654 INFO L85 PathProgramCache]: Analyzing trace with hash -159964929, now seen corresponding path program 166 times [2022-02-24 04:04:24,654 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 04:04:24,654 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1692051566] [2022-02-24 04:04:24,654 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 04:04:24,654 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 04:04:24,830 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 04:04:24,996 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 04:04:24,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:04:25,138 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 04:04:25,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:04:25,141 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 04:04:25,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:04:25,142 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 04:04:26,998 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 04:04:26,998 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1692051566] [2022-02-24 04:04:26,998 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1692051566] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 04:04:26,998 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 04:04:26,998 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [39] imperfect sequences [] total 39 [2022-02-24 04:04:26,999 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [340846175] [2022-02-24 04:04:26,999 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 04:04:26,999 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2022-02-24 04:04:26,999 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 04:04:26,999 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2022-02-24 04:04:26,999 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=186, Invalid=1454, Unknown=0, NotChecked=0, Total=1640 [2022-02-24 04:04:26,999 INFO L87 Difference]: Start difference. First operand 396 states and 468 transitions. Second operand has 39 states, 39 states have (on average 1.8717948717948718) internal successors, (73), 38 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 04:04:31,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 04:04:31,874 INFO L93 Difference]: Finished difference Result 874 states and 1021 transitions. [2022-02-24 04:04:31,874 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-02-24 04:04:31,874 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 1.8717948717948718) internal successors, (73), 38 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 79 [2022-02-24 04:04:31,874 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 04:04:31,874 INFO L225 Difference]: With dead ends: 874 [2022-02-24 04:04:31,874 INFO L226 Difference]: Without dead ends: 490 [2022-02-24 04:04:31,875 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 14 SyntacticMatches, 25 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 886 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=222, Invalid=1584, Unknown=0, NotChecked=0, Total=1806 [2022-02-24 04:04:31,875 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 96 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 2266 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 97 SdHoareTripleChecker+Valid, 54 SdHoareTripleChecker+Invalid, 2288 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 2266 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-02-24 04:04:31,875 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [97 Valid, 54 Invalid, 2288 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 2266 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2022-02-24 04:04:31,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 490 states. [2022-02-24 04:04:34,114 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 490 to 396. [2022-02-24 04:04:34,114 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 396 states, 386 states have (on average 1.1839378238341969) internal successors, (457), 387 states have internal predecessors, (457), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 04:04:34,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 396 states to 396 states and 468 transitions. [2022-02-24 04:04:34,115 INFO L78 Accepts]: Start accepts. Automaton has 396 states and 468 transitions. Word has length 79 [2022-02-24 04:04:34,115 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 04:04:34,115 INFO L470 AbstractCegarLoop]: Abstraction has 396 states and 468 transitions. [2022-02-24 04:04:34,115 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 1.8717948717948718) internal successors, (73), 38 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 04:04:34,115 INFO L276 IsEmpty]: Start isEmpty. Operand 396 states and 468 transitions. [2022-02-24 04:04:34,115 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-02-24 04:04:34,115 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 04:04:34,115 INFO L514 BasicCegarLoop]: trace histogram [19, 19, 14, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 04:04:34,115 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable208 [2022-02-24 04:04:34,116 INFO L402 AbstractCegarLoop]: === Iteration 210 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 04:04:34,116 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 04:04:34,116 INFO L85 PathProgramCache]: Analyzing trace with hash -97925315, now seen corresponding path program 167 times [2022-02-24 04:04:34,116 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 04:04:34,116 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1225531274] [2022-02-24 04:04:34,116 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 04:04:34,116 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 04:04:34,282 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 04:04:34,447 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 04:04:34,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:04:34,591 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 04:04:34,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:04:34,593 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 04:04:34,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:04:34,595 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 04:04:36,523 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 04:04:36,523 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1225531274] [2022-02-24 04:04:36,523 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1225531274] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 04:04:36,523 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 04:04:36,523 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [40] imperfect sequences [] total 40 [2022-02-24 04:04:36,523 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [805026504] [2022-02-24 04:04:36,523 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 04:04:36,523 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-02-24 04:04:36,523 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 04:04:36,524 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-02-24 04:04:36,524 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=194, Invalid=1528, Unknown=0, NotChecked=0, Total=1722 [2022-02-24 04:04:36,524 INFO L87 Difference]: Start difference. First operand 396 states and 468 transitions. Second operand has 40 states, 40 states have (on average 1.825) internal successors, (73), 39 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 04:04:41,326 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 04:04:41,327 INFO L93 Difference]: Finished difference Result 868 states and 1015 transitions. [2022-02-24 04:04:41,327 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2022-02-24 04:04:41,327 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.825) internal successors, (73), 39 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 79 [2022-02-24 04:04:41,327 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 04:04:41,328 INFO L225 Difference]: With dead ends: 868 [2022-02-24 04:04:41,328 INFO L226 Difference]: Without dead ends: 484 [2022-02-24 04:04:41,328 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 14 SyntacticMatches, 24 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 877 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=232, Invalid=1660, Unknown=0, NotChecked=0, Total=1892 [2022-02-24 04:04:41,328 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 102 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 2203 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 103 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 2226 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 2203 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2022-02-24 04:04:41,328 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [103 Valid, 46 Invalid, 2226 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 2203 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2022-02-24 04:04:41,329 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 484 states. [2022-02-24 04:04:43,514 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 484 to 396. [2022-02-24 04:04:43,515 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 396 states, 386 states have (on average 1.1839378238341969) internal successors, (457), 387 states have internal predecessors, (457), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 04:04:43,515 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 396 states to 396 states and 468 transitions. [2022-02-24 04:04:43,515 INFO L78 Accepts]: Start accepts. Automaton has 396 states and 468 transitions. Word has length 79 [2022-02-24 04:04:43,515 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 04:04:43,515 INFO L470 AbstractCegarLoop]: Abstraction has 396 states and 468 transitions. [2022-02-24 04:04:43,515 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 1.825) internal successors, (73), 39 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 04:04:43,515 INFO L276 IsEmpty]: Start isEmpty. Operand 396 states and 468 transitions. [2022-02-24 04:04:43,516 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-02-24 04:04:43,516 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 04:04:43,516 INFO L514 BasicCegarLoop]: trace histogram [19, 19, 15, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 04:04:43,516 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable209 [2022-02-24 04:04:43,516 INFO L402 AbstractCegarLoop]: === Iteration 211 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 04:04:43,516 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 04:04:43,516 INFO L85 PathProgramCache]: Analyzing trace with hash -1903363649, now seen corresponding path program 168 times [2022-02-24 04:04:43,516 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 04:04:43,516 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [826599277] [2022-02-24 04:04:43,516 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 04:04:43,516 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 04:04:43,682 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 04:04:43,846 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 04:04:43,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:04:43,986 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 04:04:43,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:04:43,988 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 04:04:43,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:04:43,990 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 04:04:46,040 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-24 04:04:46,041 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [826599277] [2022-02-24 04:04:46,041 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [826599277] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-24 04:04:46,041 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-24 04:04:46,041 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [41] imperfect sequences [] total 41 [2022-02-24 04:04:46,041 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [583646360] [2022-02-24 04:04:46,041 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-24 04:04:46,041 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2022-02-24 04:04:46,041 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-24 04:04:46,041 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2022-02-24 04:04:46,041 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=202, Invalid=1604, Unknown=0, NotChecked=0, Total=1806 [2022-02-24 04:04:46,042 INFO L87 Difference]: Start difference. First operand 396 states and 468 transitions. Second operand has 41 states, 41 states have (on average 1.7804878048780488) internal successors, (73), 40 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 04:04:51,432 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-24 04:04:51,432 INFO L93 Difference]: Finished difference Result 862 states and 1009 transitions. [2022-02-24 04:04:51,432 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2022-02-24 04:04:51,432 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.7804878048780488) internal successors, (73), 40 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 79 [2022-02-24 04:04:51,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-24 04:04:51,433 INFO L225 Difference]: With dead ends: 862 [2022-02-24 04:04:51,433 INFO L226 Difference]: Without dead ends: 478 [2022-02-24 04:04:51,433 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 14 SyntacticMatches, 23 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 859 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=242, Invalid=1738, Unknown=0, NotChecked=0, Total=1980 [2022-02-24 04:04:51,433 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 100 mSDsluCounter, 41 mSDsCounter, 0 mSdLazyCounter, 2911 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 101 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 2935 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 2911 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2022-02-24 04:04:51,433 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [101 Valid, 62 Invalid, 2935 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 2911 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2022-02-24 04:04:51,434 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 478 states. [2022-02-24 04:04:53,657 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 478 to 396. [2022-02-24 04:04:53,657 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 396 states, 386 states have (on average 1.1839378238341969) internal successors, (457), 387 states have internal predecessors, (457), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-02-24 04:04:53,658 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 396 states to 396 states and 468 transitions. [2022-02-24 04:04:53,658 INFO L78 Accepts]: Start accepts. Automaton has 396 states and 468 transitions. Word has length 79 [2022-02-24 04:04:53,658 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-24 04:04:53,658 INFO L470 AbstractCegarLoop]: Abstraction has 396 states and 468 transitions. [2022-02-24 04:04:53,658 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 1.7804878048780488) internal successors, (73), 40 states have internal predecessors, (73), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2022-02-24 04:04:53,658 INFO L276 IsEmpty]: Start isEmpty. Operand 396 states and 468 transitions. [2022-02-24 04:04:53,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-02-24 04:04:53,658 INFO L506 BasicCegarLoop]: Found error trace [2022-02-24 04:04:53,658 INFO L514 BasicCegarLoop]: trace histogram [19, 19, 16, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-24 04:04:53,658 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable210 [2022-02-24 04:04:53,658 INFO L402 AbstractCegarLoop]: === Iteration 212 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-24 04:04:53,659 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-24 04:04:53,659 INFO L85 PathProgramCache]: Analyzing trace with hash 1573955197, now seen corresponding path program 169 times [2022-02-24 04:04:53,659 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-24 04:04:53,659 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2036536853] [2022-02-24 04:04:53,659 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-24 04:04:53,659 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-24 04:04:53,830 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 04:04:53,997 INFO L275 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-24 04:04:53,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:04:54,140 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-24 04:04:54,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:04:54,142 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2022-02-24 04:04:54,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-24 04:04:54,144 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.