/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf -i ../../../trunk/examples/svcomp/loops-crafted-1/mono-crafted_8.c -------------------------------------------------------------------------------- This is Ultimate 0.2.2-dev-6c470ae [2022-02-15 02:03:20,716 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-02-15 02:03:20,718 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-02-15 02:03:20,765 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2022-02-15 02:03:20,818 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf [2022-02-15 02:03:20,831 INFO L113 SettingsManager]: Loading preferences was successful [2022-02-15 02:03:20,831 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-02-15 02:03:20,833 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-02-15 02:03:20,833 INFO L138 SettingsManager]: * sizeof long=4 [2022-02-15 02:03:20,833 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-02-15 02:03:20,833 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-02-15 02:03:20,834 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-02-15 02:03:20,834 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-02-15 02:03:20,834 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-02-15 02:03:20,834 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-02-15 02:03:20,835 INFO L138 SettingsManager]: * sizeof long double=12 [2022-02-15 02:03:20,835 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-02-15 02:03:20,835 INFO L138 SettingsManager]: * Use constant arrays=true [2022-02-15 02:03:20,835 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-02-15 02:03:20,835 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-02-15 02:03:20,836 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-02-15 02:03:20,836 INFO L138 SettingsManager]: * To the following directory=./dump/ [2022-02-15 02:03:20,836 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-02-15 02:03:20,836 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-02-15 02:03:20,836 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-02-15 02:03:20,836 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2022-02-15 02:03:20,836 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-02-15 02:03:20,836 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2022-02-15 02:03:20,836 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2022-02-15 02:03:21,039 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-02-15 02:03:21,052 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-02-15 02:03:21,054 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-02-15 02:03:21,055 INFO L271 PluginConnector]: Initializing CDTParser... [2022-02-15 02:03:21,056 INFO L275 PluginConnector]: CDTParser initialized [2022-02-15 02:03:21,057 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/mono-crafted_8.c [2022-02-15 02:03:21,110 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1575a2b5e/e8f402ce2ddf48189e04a05d0b9bb6f2/FLAG33222af28 [2022-02-15 02:03:21,509 INFO L306 CDTParser]: Found 1 translation units. [2022-02-15 02:03:21,509 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/mono-crafted_8.c [2022-02-15 02:03:21,514 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1575a2b5e/e8f402ce2ddf48189e04a05d0b9bb6f2/FLAG33222af28 [2022-02-15 02:03:21,929 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1575a2b5e/e8f402ce2ddf48189e04a05d0b9bb6f2 [2022-02-15 02:03:21,932 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-02-15 02:03:21,934 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2022-02-15 02:03:21,939 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-02-15 02:03:21,939 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-02-15 02:03:21,942 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-02-15 02:03:21,942 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.02 02:03:21" (1/1) ... [2022-02-15 02:03:21,943 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@de56b8f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.02 02:03:21, skipping insertion in model container [2022-02-15 02:03:21,943 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.02 02:03:21" (1/1) ... [2022-02-15 02:03:21,949 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-02-15 02:03:21,959 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-02-15 02:03:22,111 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/mono-crafted_8.c[318,331] [2022-02-15 02:03:22,122 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-02-15 02:03:22,128 INFO L203 MainTranslator]: Completed pre-run [2022-02-15 02:03:22,139 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/mono-crafted_8.c[318,331] [2022-02-15 02:03:22,142 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-02-15 02:03:22,152 INFO L208 MainTranslator]: Completed translation [2022-02-15 02:03:22,153 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.02 02:03:22 WrapperNode [2022-02-15 02:03:22,153 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-02-15 02:03:22,154 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-02-15 02:03:22,154 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-02-15 02:03:22,154 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-02-15 02:03:22,188 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.02 02:03:22" (1/1) ... [2022-02-15 02:03:22,188 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.02 02:03:22" (1/1) ... [2022-02-15 02:03:22,194 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.02 02:03:22" (1/1) ... [2022-02-15 02:03:22,195 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.02 02:03:22" (1/1) ... [2022-02-15 02:03:22,199 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.02 02:03:22" (1/1) ... [2022-02-15 02:03:22,202 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.02 02:03:22" (1/1) ... [2022-02-15 02:03:22,209 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.02 02:03:22" (1/1) ... [2022-02-15 02:03:22,212 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-02-15 02:03:22,213 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-02-15 02:03:22,213 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-02-15 02:03:22,213 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-02-15 02:03:22,214 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.02 02:03:22" (1/1) ... [2022-02-15 02:03:22,220 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-02-15 02:03:22,231 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-02-15 02:03:22,244 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) [2022-02-15 02:03:22,267 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 [2022-02-15 02:03:22,287 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2022-02-15 02:03:22,288 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-02-15 02:03:22,288 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2022-02-15 02:03:22,288 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-02-15 02:03:22,288 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2022-02-15 02:03:22,289 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2022-02-15 02:03:22,289 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2022-02-15 02:03:22,289 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2022-02-15 02:03:22,289 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-02-15 02:03:22,289 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-02-15 02:03:22,289 INFO L130 BoogieDeclarations]: Found specification of procedure main [2022-02-15 02:03:22,289 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2022-02-15 02:03:22,289 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-02-15 02:03:22,290 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-02-15 02:03:22,290 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-02-15 02:03:22,290 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-02-15 02:03:22,290 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-02-15 02:03:22,366 INFO L234 CfgBuilder]: Building ICFG [2022-02-15 02:03:22,367 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-02-15 02:03:22,522 INFO L275 CfgBuilder]: Performing block encoding [2022-02-15 02:03:22,527 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-02-15 02:03:22,527 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2022-02-15 02:03:22,528 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.02 02:03:22 BoogieIcfgContainer [2022-02-15 02:03:22,528 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-02-15 02:03:22,529 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-02-15 02:03:22,529 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-02-15 02:03:22,545 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-02-15 02:03:22,545 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 15.02 02:03:21" (1/3) ... [2022-02-15 02:03:22,545 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@34594694 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.02 02:03:22, skipping insertion in model container [2022-02-15 02:03:22,545 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.02 02:03:22" (2/3) ... [2022-02-15 02:03:22,546 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@34594694 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.02 02:03:22, skipping insertion in model container [2022-02-15 02:03:22,546 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.02 02:03:22" (3/3) ... [2022-02-15 02:03:22,547 INFO L111 eAbstractionObserver]: Analyzing ICFG mono-crafted_8.c [2022-02-15 02:03:22,550 INFO L205 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2022-02-15 02:03:22,550 INFO L164 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-02-15 02:03:22,625 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-02-15 02:03:22,631 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=AcceleratedInterpolation, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=JORDAN [2022-02-15 02:03:22,631 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-02-15 02:03:22,643 INFO L276 IsEmpty]: Start isEmpty. Operand has 21 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 14 states have internal predecessors, (18), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-02-15 02:03:22,649 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-02-15 02:03:22,650 INFO L506 BasicCegarLoop]: Found error trace [2022-02-15 02:03:22,650 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-15 02:03:22,651 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-15 02:03:22,655 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-15 02:03:22,655 INFO L85 PathProgramCache]: Analyzing trace with hash -2135496849, now seen corresponding path program 1 times [2022-02-15 02:03:22,662 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-15 02:03:22,663 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1606508332] [2022-02-15 02:03:22,663 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-15 02:03:22,675 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-15 02:03:22,756 INFO L274 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-02-15 02:03:22,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 02:03:22,836 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-15 02:03:22,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 02:03:22,845 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-15 02:03:22,846 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-15 02:03:22,846 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1606508332] [2022-02-15 02:03:22,847 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1606508332] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-15 02:03:22,848 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-15 02:03:22,848 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-02-15 02:03:22,849 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1845667577] [2022-02-15 02:03:22,849 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-15 02:03:22,852 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-02-15 02:03:22,852 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-15 02:03:22,874 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-02-15 02:03:22,876 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-02-15 02:03:22,877 INFO L87 Difference]: Start difference. First operand has 21 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 14 states have internal predecessors, (18), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:03:22,920 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-15 02:03:22,921 INFO L93 Difference]: Finished difference Result 33 states and 37 transitions. [2022-02-15 02:03:22,922 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-02-15 02:03:22,923 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2022-02-15 02:03:22,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-15 02:03:22,932 INFO L225 Difference]: With dead ends: 33 [2022-02-15 02:03:22,933 INFO L226 Difference]: Without dead ends: 14 [2022-02-15 02:03:22,935 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-02-15 02:03:22,939 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 13 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 5 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-02-15 02:03:22,940 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 24 Invalid, 5 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-02-15 02:03:22,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2022-02-15 02:03:22,961 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2022-02-15 02:03:22,962 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 9 states have internal predecessors, (11), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:03:22,962 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2022-02-15 02:03:22,963 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 11 [2022-02-15 02:03:22,964 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-15 02:03:22,964 INFO L470 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2022-02-15 02:03:22,964 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:03:22,964 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2022-02-15 02:03:22,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-02-15 02:03:22,965 INFO L506 BasicCegarLoop]: Found error trace [2022-02-15 02:03:22,965 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-15 02:03:22,965 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-02-15 02:03:22,965 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-15 02:03:22,966 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-15 02:03:22,966 INFO L85 PathProgramCache]: Analyzing trace with hash -2145655580, now seen corresponding path program 1 times [2022-02-15 02:03:22,966 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-15 02:03:22,966 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [638821444] [2022-02-15 02:03:22,966 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-15 02:03:22,967 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-15 02:03:22,968 INFO L274 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2022-02-15 02:03:22,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 02:03:23,043 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-15 02:03:23,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 02:03:23,055 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-15 02:03:23,055 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-15 02:03:23,055 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [638821444] [2022-02-15 02:03:23,056 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [638821444] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-15 02:03:23,056 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-15 02:03:23,056 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-02-15 02:03:23,056 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [34009050] [2022-02-15 02:03:23,056 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-15 02:03:23,057 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-02-15 02:03:23,057 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-15 02:03:23,057 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-02-15 02:03:23,057 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-02-15 02:03:23,058 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:03:23,117 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-15 02:03:23,118 INFO L93 Difference]: Finished difference Result 25 states and 29 transitions. [2022-02-15 02:03:23,118 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-02-15 02:03:23,118 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2022-02-15 02:03:23,118 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-15 02:03:23,119 INFO L225 Difference]: With dead ends: 25 [2022-02-15 02:03:23,119 INFO L226 Difference]: Without dead ends: 17 [2022-02-15 02:03:23,119 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-02-15 02:03:23,120 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 13 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 17 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-02-15 02:03:23,121 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 19 Invalid, 17 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-02-15 02:03:23,121 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2022-02-15 02:03:23,125 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 16. [2022-02-15 02:03:23,125 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 states have internal predecessors, (13), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:03:23,125 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2022-02-15 02:03:23,125 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 11 [2022-02-15 02:03:23,126 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-15 02:03:23,126 INFO L470 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2022-02-15 02:03:23,126 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:03:23,126 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2022-02-15 02:03:23,126 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-02-15 02:03:23,126 INFO L506 BasicCegarLoop]: Found error trace [2022-02-15 02:03:23,127 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-15 02:03:23,127 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-02-15 02:03:23,127 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-15 02:03:23,127 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-15 02:03:23,127 INFO L85 PathProgramCache]: Analyzing trace with hash -79339060, now seen corresponding path program 1 times [2022-02-15 02:03:23,128 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-15 02:03:23,128 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [698799447] [2022-02-15 02:03:23,128 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-15 02:03:23,308 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:03:23,308 INFO L262 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-15 02:03:23,309 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-15 02:03:23,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 02:03:23,446 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-15 02:03:23,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 02:03:23,455 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-15 02:03:23,600 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-15 02:03:23,600 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [698799447] [2022-02-15 02:03:23,601 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [698799447] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-15 02:03:23,601 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-15 02:03:23,601 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-02-15 02:03:23,601 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1241629405] [2022-02-15 02:03:23,601 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-15 02:03:23,601 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-02-15 02:03:23,601 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-15 02:03:23,602 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-02-15 02:03:23,602 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2022-02-15 02:03:23,602 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 5 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:03:23,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-15 02:03:23,756 INFO L93 Difference]: Finished difference Result 26 states and 28 transitions. [2022-02-15 02:03:23,756 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-02-15 02:03:23,756 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 5 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2022-02-15 02:03:23,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-15 02:03:23,757 INFO L225 Difference]: With dead ends: 26 [2022-02-15 02:03:23,757 INFO L226 Difference]: Without dead ends: 21 [2022-02-15 02:03:23,757 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 6 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=42, Invalid=68, Unknown=0, NotChecked=0, Total=110 [2022-02-15 02:03:23,758 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 19 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 45 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-02-15 02:03:23,758 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 28 Invalid, 45 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-02-15 02:03:23,759 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2022-02-15 02:03:23,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 19. [2022-02-15 02:03:23,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 14 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:03:23,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2022-02-15 02:03:23,764 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 14 [2022-02-15 02:03:23,765 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-15 02:03:23,765 INFO L470 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2022-02-15 02:03:23,765 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 5 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:03:23,765 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2022-02-15 02:03:23,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-02-15 02:03:23,766 INFO L506 BasicCegarLoop]: Found error trace [2022-02-15 02:03:23,766 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-15 02:03:23,766 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-02-15 02:03:23,767 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-15 02:03:23,768 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-15 02:03:23,768 INFO L85 PathProgramCache]: Analyzing trace with hash 309814626, now seen corresponding path program 1 times [2022-02-15 02:03:23,768 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-15 02:03:23,769 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1211800087] [2022-02-15 02:03:23,769 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-15 02:03:24,014 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:03:24,014 INFO L262 tedInterpolationCore]: Starting analysis with loop acceleration approximation PRECISE [2022-02-15 02:03:24,107 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:03:24,237 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:03:24,238 INFO L262 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-15 02:03:24,238 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-15 02:03:24,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 02:03:24,691 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-15 02:03:24,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 02:03:24,702 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-15 02:03:25,008 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-15 02:03:25,008 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1211800087] [2022-02-15 02:03:25,008 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1211800087] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-15 02:03:25,008 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-15 02:03:25,008 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2022-02-15 02:03:25,009 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1564373914] [2022-02-15 02:03:25,009 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-15 02:03:25,009 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-02-15 02:03:25,009 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-15 02:03:25,010 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-02-15 02:03:25,010 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=142, Unknown=0, NotChecked=0, Total=182 [2022-02-15 02:03:25,010 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand has 11 states, 10 states have (on average 1.3) internal successors, (13), 9 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:03:25,290 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-15 02:03:25,290 INFO L93 Difference]: Finished difference Result 31 states and 36 transitions. [2022-02-15 02:03:25,291 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-02-15 02:03:25,291 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 1.3) internal successors, (13), 9 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2022-02-15 02:03:25,291 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-15 02:03:25,292 INFO L225 Difference]: With dead ends: 31 [2022-02-15 02:03:25,292 INFO L226 Difference]: Without dead ends: 23 [2022-02-15 02:03:25,292 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=74, Invalid=268, Unknown=0, NotChecked=0, Total=342 [2022-02-15 02:03:25,293 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 18 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 113 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 123 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 113 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-02-15 02:03:25,294 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 48 Invalid, 123 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 113 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-02-15 02:03:25,294 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2022-02-15 02:03:25,298 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 22. [2022-02-15 02:03:25,298 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 17 states have (on average 1.1764705882352942) internal successors, (20), 17 states have internal predecessors, (20), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:03:25,299 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2022-02-15 02:03:25,299 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 17 [2022-02-15 02:03:25,300 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-15 02:03:25,300 INFO L470 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2022-02-15 02:03:25,300 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 1.3) internal successors, (13), 9 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:03:25,300 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2022-02-15 02:03:25,300 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-02-15 02:03:25,300 INFO L506 BasicCegarLoop]: Found error trace [2022-02-15 02:03:25,301 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-15 02:03:25,301 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-02-15 02:03:25,301 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-15 02:03:25,301 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-15 02:03:25,301 INFO L85 PathProgramCache]: Analyzing trace with hash 1470542348, now seen corresponding path program 2 times [2022-02-15 02:03:25,301 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-15 02:03:25,301 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1710181626] [2022-02-15 02:03:25,302 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-15 02:03:25,443 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:03:25,564 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:03:25,565 INFO L262 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-15 02:03:25,628 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:03:25,721 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:03:25,721 INFO L262 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-15 02:03:25,722 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-15 02:03:25,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 02:03:26,003 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-15 02:03:26,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 02:03:26,017 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-15 02:03:26,416 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-15 02:03:26,416 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1710181626] [2022-02-15 02:03:26,416 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1710181626] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-15 02:03:26,416 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-15 02:03:26,416 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2022-02-15 02:03:26,417 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1938287107] [2022-02-15 02:03:26,417 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-15 02:03:26,417 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-02-15 02:03:26,417 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-15 02:03:26,418 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-02-15 02:03:26,418 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=194, Unknown=0, NotChecked=0, Total=240 [2022-02-15 02:03:26,418 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand has 13 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 11 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:03:26,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-15 02:03:26,748 INFO L93 Difference]: Finished difference Result 34 states and 39 transitions. [2022-02-15 02:03:26,749 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-02-15 02:03:26,749 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 11 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 20 [2022-02-15 02:03:26,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-15 02:03:26,750 INFO L225 Difference]: With dead ends: 34 [2022-02-15 02:03:26,750 INFO L226 Difference]: Without dead ends: 26 [2022-02-15 02:03:26,750 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 3 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=90, Invalid=416, Unknown=0, NotChecked=0, Total=506 [2022-02-15 02:03:26,751 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 20 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 160 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 53 SdHoareTripleChecker+Invalid, 172 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 160 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-02-15 02:03:26,752 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 53 Invalid, 172 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 160 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-02-15 02:03:26,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-02-15 02:03:26,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2022-02-15 02:03:26,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 20 states have (on average 1.15) internal successors, (23), 20 states have internal predecessors, (23), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:03:26,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2022-02-15 02:03:26,763 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 20 [2022-02-15 02:03:26,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-15 02:03:26,764 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2022-02-15 02:03:26,764 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 11 states have internal predecessors, (16), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:03:26,764 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2022-02-15 02:03:26,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-02-15 02:03:26,764 INFO L506 BasicCegarLoop]: Found error trace [2022-02-15 02:03:26,764 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-15 02:03:26,765 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-02-15 02:03:26,765 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-15 02:03:26,765 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-15 02:03:26,765 INFO L85 PathProgramCache]: Analyzing trace with hash 1928408354, now seen corresponding path program 3 times [2022-02-15 02:03:26,765 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-15 02:03:26,765 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1057707756] [2022-02-15 02:03:26,766 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-15 02:03:26,929 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:03:27,143 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:03:27,144 INFO L262 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-15 02:03:27,249 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:03:27,355 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:03:27,355 INFO L262 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-15 02:03:27,356 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-15 02:03:27,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 02:03:27,775 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-15 02:03:27,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 02:03:27,785 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-15 02:03:33,861 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-15 02:03:33,861 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1057707756] [2022-02-15 02:03:33,861 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1057707756] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-15 02:03:33,862 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-15 02:03:33,862 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-02-15 02:03:33,862 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [846368622] [2022-02-15 02:03:33,862 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-15 02:03:33,862 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-02-15 02:03:33,862 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-15 02:03:33,862 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-02-15 02:03:33,863 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=254, Unknown=0, NotChecked=0, Total=306 [2022-02-15 02:03:33,863 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand has 15 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 13 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:03:34,206 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-15 02:03:34,206 INFO L93 Difference]: Finished difference Result 32 states and 34 transitions. [2022-02-15 02:03:34,206 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-02-15 02:03:34,207 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 13 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 23 [2022-02-15 02:03:34,207 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-15 02:03:34,207 INFO L225 Difference]: With dead ends: 32 [2022-02-15 02:03:34,208 INFO L226 Difference]: Without dead ends: 27 [2022-02-15 02:03:34,208 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 4 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 100 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=68, Invalid=352, Unknown=0, NotChecked=0, Total=420 [2022-02-15 02:03:34,214 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 6 mSDsluCounter, 73 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 82 SdHoareTripleChecker+Invalid, 76 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 58 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-02-15 02:03:34,214 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 82 Invalid, 76 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 15 Invalid, 0 Unknown, 58 Unchecked, 0.0s Time] [2022-02-15 02:03:34,214 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2022-02-15 02:03:34,222 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2022-02-15 02:03:34,223 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 22 states have (on average 1.1363636363636365) internal successors, (25), 22 states have internal predecessors, (25), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:03:34,232 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 29 transitions. [2022-02-15 02:03:34,232 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 29 transitions. Word has length 23 [2022-02-15 02:03:34,232 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-15 02:03:34,232 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 29 transitions. [2022-02-15 02:03:34,234 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 13 states have internal predecessors, (19), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:03:34,234 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 29 transitions. [2022-02-15 02:03:34,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-02-15 02:03:34,235 INFO L506 BasicCegarLoop]: Found error trace [2022-02-15 02:03:34,236 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-15 02:03:34,236 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2022-02-15 02:03:34,236 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-15 02:03:34,236 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-15 02:03:34,236 INFO L85 PathProgramCache]: Analyzing trace with hash 1398461004, now seen corresponding path program 4 times [2022-02-15 02:03:34,236 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-15 02:03:34,236 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [95772386] [2022-02-15 02:03:34,236 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-15 02:03:34,481 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:03:34,618 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:03:34,619 INFO L262 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-15 02:03:34,708 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:03:34,820 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:03:34,820 INFO L262 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-15 02:03:34,820 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-15 02:03:34,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 02:03:35,121 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-15 02:03:35,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 02:03:35,135 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-15 02:03:36,031 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-15 02:03:36,032 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [95772386] [2022-02-15 02:03:36,032 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [95772386] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-15 02:03:36,032 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-15 02:03:36,032 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [17] imperfect sequences [] total 17 [2022-02-15 02:03:36,032 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2033723739] [2022-02-15 02:03:36,032 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-15 02:03:36,033 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-02-15 02:03:36,033 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-15 02:03:36,033 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-02-15 02:03:36,033 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=321, Unknown=0, NotChecked=0, Total=380 [2022-02-15 02:03:36,034 INFO L87 Difference]: Start difference. First operand 27 states and 29 transitions. Second operand has 17 states, 16 states have (on average 1.375) internal successors, (22), 15 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:03:36,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-15 02:03:36,762 INFO L93 Difference]: Finished difference Result 40 states and 46 transitions. [2022-02-15 02:03:36,762 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-02-15 02:03:36,762 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 1.375) internal successors, (22), 15 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 26 [2022-02-15 02:03:36,763 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-15 02:03:36,763 INFO L225 Difference]: With dead ends: 40 [2022-02-15 02:03:36,763 INFO L226 Difference]: Without dead ends: 32 [2022-02-15 02:03:36,764 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 4 SyntacticMatches, 5 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 181 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=123, Invalid=807, Unknown=0, NotChecked=0, Total=930 [2022-02-15 02:03:36,764 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 21 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 326 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 343 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 326 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-02-15 02:03:36,764 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 78 Invalid, 343 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 326 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-02-15 02:03:36,765 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2022-02-15 02:03:36,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2022-02-15 02:03:36,775 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 26 states have (on average 1.1153846153846154) internal successors, (29), 26 states have internal predecessors, (29), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:03:36,775 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 33 transitions. [2022-02-15 02:03:36,775 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 33 transitions. Word has length 26 [2022-02-15 02:03:36,775 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-15 02:03:36,775 INFO L470 AbstractCegarLoop]: Abstraction has 31 states and 33 transitions. [2022-02-15 02:03:36,775 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 1.375) internal successors, (22), 15 states have internal predecessors, (22), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:03:36,776 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 33 transitions. [2022-02-15 02:03:36,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-02-15 02:03:36,776 INFO L506 BasicCegarLoop]: Found error trace [2022-02-15 02:03:36,776 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-15 02:03:36,776 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2022-02-15 02:03:36,776 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-15 02:03:36,776 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-15 02:03:36,777 INFO L85 PathProgramCache]: Analyzing trace with hash 2036737250, now seen corresponding path program 5 times [2022-02-15 02:03:36,777 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-15 02:03:36,777 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1533526929] [2022-02-15 02:03:36,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-15 02:03:36,914 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:03:37,068 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:03:37,069 INFO L262 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-15 02:03:37,135 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:03:37,216 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:03:37,216 INFO L262 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-15 02:03:37,217 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-15 02:03:37,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 02:03:37,445 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-15 02:03:37,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 02:03:37,454 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-15 02:03:38,331 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-15 02:03:38,331 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1533526929] [2022-02-15 02:03:38,331 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1533526929] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-15 02:03:38,331 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-15 02:03:38,331 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2022-02-15 02:03:38,331 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1927974854] [2022-02-15 02:03:38,331 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-15 02:03:38,332 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-02-15 02:03:38,332 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-15 02:03:38,332 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-02-15 02:03:38,332 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=398, Unknown=0, NotChecked=0, Total=462 [2022-02-15 02:03:38,332 INFO L87 Difference]: Start difference. First operand 31 states and 33 transitions. Second operand has 19 states, 18 states have (on average 1.3888888888888888) internal successors, (25), 17 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:03:39,396 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-15 02:03:39,397 INFO L93 Difference]: Finished difference Result 43 states and 48 transitions. [2022-02-15 02:03:39,397 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-02-15 02:03:39,397 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 1.3888888888888888) internal successors, (25), 17 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 29 [2022-02-15 02:03:39,397 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-15 02:03:39,398 INFO L225 Difference]: With dead ends: 43 [2022-02-15 02:03:39,398 INFO L226 Difference]: Without dead ends: 35 [2022-02-15 02:03:39,398 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 6 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 228 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=138, Invalid=1052, Unknown=0, NotChecked=0, Total=1190 [2022-02-15 02:03:39,399 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 22 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 443 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 93 SdHoareTripleChecker+Invalid, 461 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 443 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-02-15 02:03:39,399 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 93 Invalid, 461 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 443 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-02-15 02:03:39,399 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2022-02-15 02:03:39,414 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 34. [2022-02-15 02:03:39,415 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 29 states have (on average 1.103448275862069) internal successors, (32), 29 states have internal predecessors, (32), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:03:39,416 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 36 transitions. [2022-02-15 02:03:39,416 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 36 transitions. Word has length 29 [2022-02-15 02:03:39,416 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-15 02:03:39,416 INFO L470 AbstractCegarLoop]: Abstraction has 34 states and 36 transitions. [2022-02-15 02:03:39,416 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 18 states have (on average 1.3888888888888888) internal successors, (25), 17 states have internal predecessors, (25), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:03:39,417 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 36 transitions. [2022-02-15 02:03:39,417 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-02-15 02:03:39,417 INFO L506 BasicCegarLoop]: Found error trace [2022-02-15 02:03:39,417 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-15 02:03:39,418 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2022-02-15 02:03:39,418 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-15 02:03:39,418 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-15 02:03:39,418 INFO L85 PathProgramCache]: Analyzing trace with hash -1190804852, now seen corresponding path program 6 times [2022-02-15 02:03:39,418 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-15 02:03:39,418 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1342398048] [2022-02-15 02:03:39,418 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-15 02:03:39,650 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:03:39,821 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:03:39,822 INFO L262 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-15 02:03:39,906 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:03:40,048 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:03:40,048 INFO L262 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-15 02:03:40,048 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-15 02:03:40,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 02:03:40,288 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-15 02:03:40,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 02:03:40,293 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-15 02:03:45,233 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-15 02:03:45,233 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1342398048] [2022-02-15 02:03:45,233 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1342398048] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-15 02:03:45,233 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-15 02:03:45,233 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [21] imperfect sequences [] total 21 [2022-02-15 02:03:45,233 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1099481633] [2022-02-15 02:03:45,233 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-15 02:03:45,233 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-02-15 02:03:45,234 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-15 02:03:45,234 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-02-15 02:03:45,234 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=482, Unknown=0, NotChecked=0, Total=552 [2022-02-15 02:03:45,235 INFO L87 Difference]: Start difference. First operand 34 states and 36 transitions. Second operand has 21 states, 20 states have (on average 1.4) internal successors, (28), 19 states have internal predecessors, (28), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:03:45,353 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-15 02:03:45,353 INFO L93 Difference]: Finished difference Result 41 states and 43 transitions. [2022-02-15 02:03:45,354 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-02-15 02:03:45,354 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 1.4) internal successors, (28), 19 states have internal predecessors, (28), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 32 [2022-02-15 02:03:45,354 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-15 02:03:45,355 INFO L225 Difference]: With dead ends: 41 [2022-02-15 02:03:45,355 INFO L226 Difference]: Without dead ends: 36 [2022-02-15 02:03:45,355 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 4 SyntacticMatches, 7 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 175 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=86, Invalid=616, Unknown=0, NotChecked=0, Total=702 [2022-02-15 02:03:45,356 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 6 mSDsluCounter, 97 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 106 SdHoareTripleChecker+Invalid, 94 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 76 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-02-15 02:03:45,356 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 106 Invalid, 94 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 15 Invalid, 0 Unknown, 76 Unchecked, 0.0s Time] [2022-02-15 02:03:45,356 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2022-02-15 02:03:45,373 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2022-02-15 02:03:45,373 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 31 states have (on average 1.096774193548387) internal successors, (34), 31 states have internal predecessors, (34), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:03:45,374 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2022-02-15 02:03:45,374 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 32 [2022-02-15 02:03:45,374 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-15 02:03:45,374 INFO L470 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2022-02-15 02:03:45,375 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 20 states have (on average 1.4) internal successors, (28), 19 states have internal predecessors, (28), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:03:45,375 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2022-02-15 02:03:45,375 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-02-15 02:03:45,375 INFO L506 BasicCegarLoop]: Found error trace [2022-02-15 02:03:45,375 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-15 02:03:45,376 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2022-02-15 02:03:45,376 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-15 02:03:45,376 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-15 02:03:45,376 INFO L85 PathProgramCache]: Analyzing trace with hash -1464709982, now seen corresponding path program 7 times [2022-02-15 02:03:45,376 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-15 02:03:45,376 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [464680237] [2022-02-15 02:03:45,376 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-15 02:03:45,621 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:03:45,920 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:03:45,920 INFO L262 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-15 02:03:46,001 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:03:46,091 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:03:46,091 INFO L262 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-15 02:03:46,091 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-15 02:03:46,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 02:03:46,350 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-15 02:03:46,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 02:03:46,354 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-15 02:03:47,683 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-15 02:03:47,684 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [464680237] [2022-02-15 02:03:47,684 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [464680237] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-15 02:03:47,684 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-15 02:03:47,684 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2022-02-15 02:03:47,684 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1176363978] [2022-02-15 02:03:47,684 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-15 02:03:47,684 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-02-15 02:03:47,684 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-15 02:03:47,685 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-02-15 02:03:47,685 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=574, Unknown=0, NotChecked=0, Total=650 [2022-02-15 02:03:47,685 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand has 23 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 21 states have internal predecessors, (31), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:03:48,932 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-15 02:03:48,932 INFO L93 Difference]: Finished difference Result 49 states and 55 transitions. [2022-02-15 02:03:48,932 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-02-15 02:03:48,932 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 21 states have internal predecessors, (31), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 35 [2022-02-15 02:03:48,932 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-15 02:03:48,933 INFO L225 Difference]: With dead ends: 49 [2022-02-15 02:03:48,933 INFO L226 Difference]: Without dead ends: 41 [2022-02-15 02:03:48,933 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 4 SyntacticMatches, 8 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 340 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=170, Invalid=1636, Unknown=0, NotChecked=0, Total=1806 [2022-02-15 02:03:48,934 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 25 mSDsluCounter, 92 mSDsCounter, 0 mSdLazyCounter, 620 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 103 SdHoareTripleChecker+Invalid, 643 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 620 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-02-15 02:03:48,934 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 103 Invalid, 643 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 620 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-02-15 02:03:48,934 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2022-02-15 02:03:48,961 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 40. [2022-02-15 02:03:48,968 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 35 states have (on average 1.0857142857142856) internal successors, (38), 35 states have internal predecessors, (38), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:03:48,969 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2022-02-15 02:03:48,969 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 35 [2022-02-15 02:03:48,969 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-15 02:03:48,969 INFO L470 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2022-02-15 02:03:48,969 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 21 states have internal predecessors, (31), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:03:48,969 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2022-02-15 02:03:48,970 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-02-15 02:03:48,970 INFO L506 BasicCegarLoop]: Found error trace [2022-02-15 02:03:48,970 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-15 02:03:48,970 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2022-02-15 02:03:48,970 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-15 02:03:48,971 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-15 02:03:48,971 INFO L85 PathProgramCache]: Analyzing trace with hash -934575412, now seen corresponding path program 8 times [2022-02-15 02:03:48,971 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-15 02:03:48,971 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1432951513] [2022-02-15 02:03:48,973 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-15 02:03:49,155 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:03:49,272 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:03:49,273 INFO L262 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-15 02:03:49,348 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:03:49,448 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:03:49,449 INFO L262 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-15 02:03:49,449 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-15 02:03:49,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 02:03:49,668 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-15 02:03:49,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 02:03:49,676 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-15 02:03:51,133 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-15 02:03:51,133 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1432951513] [2022-02-15 02:03:51,133 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1432951513] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-15 02:03:51,133 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-15 02:03:51,133 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2022-02-15 02:03:51,133 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [106211198] [2022-02-15 02:03:51,134 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-15 02:03:51,135 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-02-15 02:03:51,136 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-15 02:03:51,136 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-02-15 02:03:51,137 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=674, Unknown=0, NotChecked=0, Total=756 [2022-02-15 02:03:51,137 INFO L87 Difference]: Start difference. First operand 40 states and 42 transitions. Second operand has 25 states, 24 states have (on average 1.4166666666666667) internal successors, (34), 23 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:03:52,659 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-15 02:03:52,659 INFO L93 Difference]: Finished difference Result 52 states and 57 transitions. [2022-02-15 02:03:52,660 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-02-15 02:03:52,660 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 1.4166666666666667) internal successors, (34), 23 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 38 [2022-02-15 02:03:52,660 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-15 02:03:52,660 INFO L225 Difference]: With dead ends: 52 [2022-02-15 02:03:52,660 INFO L226 Difference]: Without dead ends: 44 [2022-02-15 02:03:52,661 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 4 SyntacticMatches, 9 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 402 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=186, Invalid=1976, Unknown=0, NotChecked=0, Total=2162 [2022-02-15 02:03:52,662 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 25 mSDsluCounter, 112 mSDsCounter, 0 mSdLazyCounter, 809 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 123 SdHoareTripleChecker+Invalid, 833 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 809 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-02-15 02:03:52,662 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [25 Valid, 123 Invalid, 833 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 809 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-02-15 02:03:52,662 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-02-15 02:03:52,676 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2022-02-15 02:03:52,676 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 38 states have (on average 1.0789473684210527) internal successors, (41), 38 states have internal predecessors, (41), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:03:52,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 45 transitions. [2022-02-15 02:03:52,677 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 45 transitions. Word has length 38 [2022-02-15 02:03:52,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-15 02:03:52,677 INFO L470 AbstractCegarLoop]: Abstraction has 43 states and 45 transitions. [2022-02-15 02:03:52,677 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 24 states have (on average 1.4166666666666667) internal successors, (34), 23 states have internal predecessors, (34), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:03:52,677 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 45 transitions. [2022-02-15 02:03:52,678 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-02-15 02:03:52,678 INFO L506 BasicCegarLoop]: Found error trace [2022-02-15 02:03:52,678 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-15 02:03:52,678 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2022-02-15 02:03:52,678 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-15 02:03:52,678 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-15 02:03:52,679 INFO L85 PathProgramCache]: Analyzing trace with hash -290347934, now seen corresponding path program 9 times [2022-02-15 02:03:52,679 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-15 02:03:52,679 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [936038322] [2022-02-15 02:03:52,679 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-15 02:03:52,810 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:03:53,076 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:03:53,076 INFO L262 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-15 02:03:53,152 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:03:53,218 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:03:53,219 INFO L262 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-15 02:03:53,219 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-15 02:03:53,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 02:03:53,415 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-15 02:03:53,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 02:03:53,418 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-15 02:03:55,164 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-15 02:03:55,165 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [936038322] [2022-02-15 02:03:55,165 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [936038322] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-15 02:03:55,165 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-15 02:03:55,165 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [] total 27 [2022-02-15 02:03:55,165 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [929006446] [2022-02-15 02:03:55,166 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-15 02:03:55,166 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-02-15 02:03:55,166 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-15 02:03:55,166 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-02-15 02:03:55,167 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=782, Unknown=0, NotChecked=0, Total=870 [2022-02-15 02:03:55,167 INFO L87 Difference]: Start difference. First operand 43 states and 45 transitions. Second operand has 27 states, 26 states have (on average 1.4230769230769231) internal successors, (37), 25 states have internal predecessors, (37), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:03:56,771 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-15 02:03:56,771 INFO L93 Difference]: Finished difference Result 55 states and 60 transitions. [2022-02-15 02:03:56,771 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-02-15 02:03:56,772 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 26 states have (on average 1.4230769230769231) internal successors, (37), 25 states have internal predecessors, (37), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 41 [2022-02-15 02:03:56,772 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-15 02:03:56,772 INFO L225 Difference]: With dead ends: 55 [2022-02-15 02:03:56,772 INFO L226 Difference]: Without dead ends: 47 [2022-02-15 02:03:56,773 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 4 SyntacticMatches, 10 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 468 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=202, Invalid=2348, Unknown=0, NotChecked=0, Total=2550 [2022-02-15 02:03:56,773 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 27 mSDsluCounter, 117 mSDsCounter, 0 mSdLazyCounter, 922 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 128 SdHoareTripleChecker+Invalid, 948 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 922 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-02-15 02:03:56,774 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 128 Invalid, 948 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 922 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-02-15 02:03:56,774 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2022-02-15 02:03:56,788 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 46. [2022-02-15 02:03:56,788 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 41 states have (on average 1.0731707317073171) internal successors, (44), 41 states have internal predecessors, (44), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:03:56,792 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 48 transitions. [2022-02-15 02:03:56,792 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 48 transitions. Word has length 41 [2022-02-15 02:03:56,793 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-15 02:03:56,793 INFO L470 AbstractCegarLoop]: Abstraction has 46 states and 48 transitions. [2022-02-15 02:03:56,793 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 26 states have (on average 1.4230769230769231) internal successors, (37), 25 states have internal predecessors, (37), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:03:56,793 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 48 transitions. [2022-02-15 02:03:56,794 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-02-15 02:03:56,794 INFO L506 BasicCegarLoop]: Found error trace [2022-02-15 02:03:56,794 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-15 02:03:56,794 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2022-02-15 02:03:56,794 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-15 02:03:56,794 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-15 02:03:56,794 INFO L85 PathProgramCache]: Analyzing trace with hash 1976570636, now seen corresponding path program 10 times [2022-02-15 02:03:56,794 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-15 02:03:56,794 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [361002341] [2022-02-15 02:03:56,794 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-15 02:03:56,942 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:03:57,099 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:03:57,100 INFO L262 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-15 02:03:57,177 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:03:57,249 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:03:57,250 INFO L262 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-15 02:03:57,250 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-15 02:03:57,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 02:03:57,464 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-15 02:03:57,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 02:03:57,468 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-15 02:03:59,628 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-15 02:03:59,629 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [361002341] [2022-02-15 02:03:59,629 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [361002341] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-15 02:03:59,629 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-15 02:03:59,629 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [29] imperfect sequences [] total 29 [2022-02-15 02:03:59,629 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [585541803] [2022-02-15 02:03:59,629 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-15 02:03:59,629 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-02-15 02:03:59,629 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-15 02:03:59,630 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-02-15 02:03:59,630 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=898, Unknown=0, NotChecked=0, Total=992 [2022-02-15 02:03:59,630 INFO L87 Difference]: Start difference. First operand 46 states and 48 transitions. Second operand has 29 states, 28 states have (on average 1.4285714285714286) internal successors, (40), 27 states have internal predecessors, (40), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:04:01,751 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-15 02:04:01,751 INFO L93 Difference]: Finished difference Result 58 states and 63 transitions. [2022-02-15 02:04:01,754 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-02-15 02:04:01,754 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 28 states have (on average 1.4285714285714286) internal successors, (40), 27 states have internal predecessors, (40), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 44 [2022-02-15 02:04:01,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-15 02:04:01,755 INFO L225 Difference]: With dead ends: 58 [2022-02-15 02:04:01,755 INFO L226 Difference]: Without dead ends: 50 [2022-02-15 02:04:01,756 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 4 SyntacticMatches, 11 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 538 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=218, Invalid=2752, Unknown=0, NotChecked=0, Total=2970 [2022-02-15 02:04:01,756 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 27 mSDsluCounter, 132 mSDsCounter, 0 mSdLazyCounter, 1113 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 143 SdHoareTripleChecker+Invalid, 1141 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 1113 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-02-15 02:04:01,756 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 143 Invalid, 1141 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 1113 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-02-15 02:04:01,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2022-02-15 02:04:01,785 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 49. [2022-02-15 02:04:01,785 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 44 states have (on average 1.0681818181818181) internal successors, (47), 44 states have internal predecessors, (47), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:04:01,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 51 transitions. [2022-02-15 02:04:01,787 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 51 transitions. Word has length 44 [2022-02-15 02:04:01,788 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-15 02:04:01,788 INFO L470 AbstractCegarLoop]: Abstraction has 49 states and 51 transitions. [2022-02-15 02:04:01,788 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 28 states have (on average 1.4285714285714286) internal successors, (40), 27 states have internal predecessors, (40), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:04:01,788 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 51 transitions. [2022-02-15 02:04:01,794 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-02-15 02:04:01,794 INFO L506 BasicCegarLoop]: Found error trace [2022-02-15 02:04:01,794 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-15 02:04:01,795 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2022-02-15 02:04:01,795 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-15 02:04:01,795 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-15 02:04:01,795 INFO L85 PathProgramCache]: Analyzing trace with hash 1681927202, now seen corresponding path program 11 times [2022-02-15 02:04:01,796 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-15 02:04:01,796 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [661000113] [2022-02-15 02:04:01,796 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-15 02:04:02,086 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:04:02,286 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:04:02,286 INFO L262 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-15 02:04:02,363 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:04:02,423 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:04:02,423 INFO L262 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-15 02:04:02,423 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-15 02:04:02,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 02:04:02,612 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-15 02:04:02,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 02:04:02,616 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-15 02:04:04,790 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-15 02:04:04,791 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [661000113] [2022-02-15 02:04:04,791 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [661000113] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-15 02:04:04,791 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-15 02:04:04,791 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [31] imperfect sequences [] total 31 [2022-02-15 02:04:04,791 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1952695174] [2022-02-15 02:04:04,791 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-15 02:04:04,791 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-02-15 02:04:04,791 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-15 02:04:04,792 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-02-15 02:04:04,792 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=1021, Unknown=0, NotChecked=0, Total=1122 [2022-02-15 02:04:04,792 INFO L87 Difference]: Start difference. First operand 49 states and 51 transitions. Second operand has 31 states, 30 states have (on average 1.4333333333333333) internal successors, (43), 29 states have internal predecessors, (43), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:04:07,020 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-15 02:04:07,020 INFO L93 Difference]: Finished difference Result 61 states and 66 transitions. [2022-02-15 02:04:07,020 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-02-15 02:04:07,020 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 30 states have (on average 1.4333333333333333) internal successors, (43), 29 states have internal predecessors, (43), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 47 [2022-02-15 02:04:07,020 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-15 02:04:07,021 INFO L225 Difference]: With dead ends: 61 [2022-02-15 02:04:07,021 INFO L226 Difference]: Without dead ends: 53 [2022-02-15 02:04:07,022 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 4 SyntacticMatches, 12 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 615 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=235, Invalid=3187, Unknown=0, NotChecked=0, Total=3422 [2022-02-15 02:04:07,022 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 29 mSDsluCounter, 132 mSDsCounter, 0 mSdLazyCounter, 1204 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 143 SdHoareTripleChecker+Invalid, 1234 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 1204 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-02-15 02:04:07,022 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 143 Invalid, 1234 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 1204 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-02-15 02:04:07,023 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2022-02-15 02:04:07,038 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 52. [2022-02-15 02:04:07,038 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 47 states have (on average 1.0638297872340425) internal successors, (50), 47 states have internal predecessors, (50), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:04:07,038 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 54 transitions. [2022-02-15 02:04:07,038 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 54 transitions. Word has length 47 [2022-02-15 02:04:07,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-15 02:04:07,039 INFO L470 AbstractCegarLoop]: Abstraction has 52 states and 54 transitions. [2022-02-15 02:04:07,039 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 30 states have (on average 1.4333333333333333) internal successors, (43), 29 states have internal predecessors, (43), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:04:07,039 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 54 transitions. [2022-02-15 02:04:07,039 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-02-15 02:04:07,039 INFO L506 BasicCegarLoop]: Found error trace [2022-02-15 02:04:07,039 INFO L514 BasicCegarLoop]: trace histogram [13, 13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-15 02:04:07,039 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2022-02-15 02:04:07,039 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-15 02:04:07,039 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-15 02:04:07,040 INFO L85 PathProgramCache]: Analyzing trace with hash -1422429364, now seen corresponding path program 12 times [2022-02-15 02:04:07,040 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-15 02:04:07,040 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [442664197] [2022-02-15 02:04:07,040 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-15 02:04:07,250 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:04:07,391 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:04:07,392 INFO L262 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-15 02:04:07,451 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:04:07,526 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:04:07,526 INFO L262 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-15 02:04:07,527 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-15 02:04:07,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 02:04:07,709 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-15 02:04:07,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 02:04:07,713 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-15 02:04:10,229 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-15 02:04:10,230 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [442664197] [2022-02-15 02:04:10,230 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [442664197] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-15 02:04:10,230 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-15 02:04:10,230 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2022-02-15 02:04:10,230 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [735420185] [2022-02-15 02:04:10,230 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-15 02:04:10,230 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-02-15 02:04:10,230 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-15 02:04:10,231 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-02-15 02:04:10,231 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=1154, Unknown=0, NotChecked=0, Total=1260 [2022-02-15 02:04:10,231 INFO L87 Difference]: Start difference. First operand 52 states and 54 transitions. Second operand has 33 states, 32 states have (on average 1.4375) internal successors, (46), 31 states have internal predecessors, (46), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:04:12,852 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-15 02:04:12,852 INFO L93 Difference]: Finished difference Result 64 states and 69 transitions. [2022-02-15 02:04:12,853 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-02-15 02:04:12,853 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 32 states have (on average 1.4375) internal successors, (46), 31 states have internal predecessors, (46), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 50 [2022-02-15 02:04:12,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-15 02:04:12,854 INFO L225 Difference]: With dead ends: 64 [2022-02-15 02:04:12,854 INFO L226 Difference]: Without dead ends: 56 [2022-02-15 02:04:12,855 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 4 SyntacticMatches, 13 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 690 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=250, Invalid=3656, Unknown=0, NotChecked=0, Total=3906 [2022-02-15 02:04:12,855 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 29 mSDsluCounter, 147 mSDsCounter, 0 mSdLazyCounter, 1422 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 158 SdHoareTripleChecker+Invalid, 1454 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 1422 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-02-15 02:04:12,856 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [29 Valid, 158 Invalid, 1454 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 1422 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-02-15 02:04:12,856 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2022-02-15 02:04:12,879 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2022-02-15 02:04:12,880 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 50 states have (on average 1.06) internal successors, (53), 50 states have internal predecessors, (53), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:04:12,880 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 57 transitions. [2022-02-15 02:04:12,880 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 57 transitions. Word has length 50 [2022-02-15 02:04:12,881 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-15 02:04:12,881 INFO L470 AbstractCegarLoop]: Abstraction has 55 states and 57 transitions. [2022-02-15 02:04:12,881 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 32 states have (on average 1.4375) internal successors, (46), 31 states have internal predecessors, (46), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:04:12,881 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 57 transitions. [2022-02-15 02:04:12,881 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2022-02-15 02:04:12,881 INFO L506 BasicCegarLoop]: Found error trace [2022-02-15 02:04:12,882 INFO L514 BasicCegarLoop]: trace histogram [14, 14, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-15 02:04:12,882 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2022-02-15 02:04:12,882 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-15 02:04:12,882 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-15 02:04:12,882 INFO L85 PathProgramCache]: Analyzing trace with hash 221897698, now seen corresponding path program 13 times [2022-02-15 02:04:12,882 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-15 02:04:12,882 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [943026019] [2022-02-15 02:04:12,882 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-15 02:04:13,071 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:04:13,198 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:04:13,198 INFO L262 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-15 02:04:13,280 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:04:13,388 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:04:13,388 INFO L262 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-15 02:04:13,389 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-15 02:04:13,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 02:04:13,604 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-15 02:04:13,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 02:04:13,607 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-15 02:04:30,911 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-15 02:04:30,911 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [943026019] [2022-02-15 02:04:30,912 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [943026019] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-15 02:04:30,912 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-15 02:04:30,912 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2022-02-15 02:04:30,912 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [101970694] [2022-02-15 02:04:30,912 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-15 02:04:30,912 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-02-15 02:04:30,912 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-15 02:04:30,913 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-02-15 02:04:30,913 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=1294, Unknown=0, NotChecked=0, Total=1406 [2022-02-15 02:04:30,913 INFO L87 Difference]: Start difference. First operand 55 states and 57 transitions. Second operand has 35 states, 34 states have (on average 1.4411764705882353) internal successors, (49), 33 states have internal predecessors, (49), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:04:31,085 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-15 02:04:31,085 INFO L93 Difference]: Finished difference Result 62 states and 64 transitions. [2022-02-15 02:04:31,086 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-02-15 02:04:31,086 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 34 states have (on average 1.4411764705882353) internal successors, (49), 33 states have internal predecessors, (49), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 53 [2022-02-15 02:04:31,086 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-15 02:04:31,086 INFO L225 Difference]: With dead ends: 62 [2022-02-15 02:04:31,086 INFO L226 Difference]: Without dead ends: 57 [2022-02-15 02:04:31,087 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 4 SyntacticMatches, 14 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 350 ImplicationChecksByTransitivity, 16.8s TimeCoverageRelationStatistics Valid=128, Invalid=1512, Unknown=0, NotChecked=0, Total=1640 [2022-02-15 02:04:31,088 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 6 mSDsluCounter, 193 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 202 SdHoareTripleChecker+Invalid, 206 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 188 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-02-15 02:04:31,088 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 202 Invalid, 206 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 15 Invalid, 0 Unknown, 188 Unchecked, 0.0s Time] [2022-02-15 02:04:31,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2022-02-15 02:04:31,116 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2022-02-15 02:04:31,117 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 52 states have (on average 1.0576923076923077) internal successors, (55), 52 states have internal predecessors, (55), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:04:31,117 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 59 transitions. [2022-02-15 02:04:31,117 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 59 transitions. Word has length 53 [2022-02-15 02:04:31,117 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-15 02:04:31,118 INFO L470 AbstractCegarLoop]: Abstraction has 57 states and 59 transitions. [2022-02-15 02:04:31,118 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 34 states have (on average 1.4411764705882353) internal successors, (49), 33 states have internal predecessors, (49), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:04:31,118 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 59 transitions. [2022-02-15 02:04:31,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2022-02-15 02:04:31,118 INFO L506 BasicCegarLoop]: Found error trace [2022-02-15 02:04:31,119 INFO L514 BasicCegarLoop]: trace histogram [15, 15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-15 02:04:31,119 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2022-02-15 02:04:31,119 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-15 02:04:31,119 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-15 02:04:31,119 INFO L85 PathProgramCache]: Analyzing trace with hash -2027576436, now seen corresponding path program 14 times [2022-02-15 02:04:31,119 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-15 02:04:31,119 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1644403993] [2022-02-15 02:04:31,119 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-15 02:04:31,271 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:04:31,482 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:04:31,483 INFO L262 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-15 02:04:31,541 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:04:31,675 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:04:31,675 INFO L262 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-15 02:04:31,676 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-15 02:04:31,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 02:04:32,017 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-15 02:04:32,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 02:04:32,020 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-15 02:04:35,312 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-15 02:04:35,313 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1644403993] [2022-02-15 02:04:35,313 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1644403993] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-15 02:04:35,313 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-15 02:04:35,313 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [37] imperfect sequences [] total 37 [2022-02-15 02:04:35,313 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [593326386] [2022-02-15 02:04:35,313 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-15 02:04:35,313 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2022-02-15 02:04:35,313 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-15 02:04:35,314 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2022-02-15 02:04:35,314 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=1442, Unknown=0, NotChecked=0, Total=1560 [2022-02-15 02:04:35,314 INFO L87 Difference]: Start difference. First operand 57 states and 59 transitions. Second operand has 37 states, 36 states have (on average 1.4444444444444444) internal successors, (52), 35 states have internal predecessors, (52), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:04:38,680 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-15 02:04:38,681 INFO L93 Difference]: Finished difference Result 70 states and 76 transitions. [2022-02-15 02:04:38,681 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-02-15 02:04:38,681 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 36 states have (on average 1.4444444444444444) internal successors, (52), 35 states have internal predecessors, (52), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 56 [2022-02-15 02:04:38,681 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-15 02:04:38,682 INFO L225 Difference]: With dead ends: 70 [2022-02-15 02:04:38,682 INFO L226 Difference]: Without dead ends: 62 [2022-02-15 02:04:38,683 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 4 SyntacticMatches, 15 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 858 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=282, Invalid=4688, Unknown=0, NotChecked=0, Total=4970 [2022-02-15 02:04:38,684 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 32 mSDsluCounter, 167 mSDsCounter, 0 mSdLazyCounter, 1817 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 178 SdHoareTripleChecker+Invalid, 1854 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 1817 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2022-02-15 02:04:38,684 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 178 Invalid, 1854 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 1817 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2022-02-15 02:04:38,684 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2022-02-15 02:04:38,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2022-02-15 02:04:38,746 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 56 states have (on average 1.0535714285714286) internal successors, (59), 56 states have internal predecessors, (59), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:04:38,746 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 63 transitions. [2022-02-15 02:04:38,747 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 63 transitions. Word has length 56 [2022-02-15 02:04:38,747 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-15 02:04:38,747 INFO L470 AbstractCegarLoop]: Abstraction has 61 states and 63 transitions. [2022-02-15 02:04:38,747 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 36 states have (on average 1.4444444444444444) internal successors, (52), 35 states have internal predecessors, (52), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:04:38,747 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 63 transitions. [2022-02-15 02:04:38,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-02-15 02:04:38,748 INFO L506 BasicCegarLoop]: Found error trace [2022-02-15 02:04:38,748 INFO L514 BasicCegarLoop]: trace histogram [16, 16, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-15 02:04:38,748 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2022-02-15 02:04:38,748 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-15 02:04:38,748 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-15 02:04:38,748 INFO L85 PathProgramCache]: Analyzing trace with hash -1736782942, now seen corresponding path program 15 times [2022-02-15 02:04:38,748 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-15 02:04:38,748 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [896108217] [2022-02-15 02:04:38,749 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-15 02:04:38,922 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:04:39,057 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:04:39,058 INFO L262 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-15 02:04:39,138 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:04:39,223 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:04:39,224 INFO L262 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-15 02:04:39,224 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-15 02:04:39,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 02:04:39,376 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-15 02:04:39,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 02:04:39,383 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-15 02:04:43,179 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-15 02:04:43,179 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [896108217] [2022-02-15 02:04:43,179 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [896108217] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-15 02:04:43,179 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-15 02:04:43,180 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [39] imperfect sequences [] total 39 [2022-02-15 02:04:43,180 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [322507983] [2022-02-15 02:04:43,180 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-15 02:04:43,180 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2022-02-15 02:04:43,181 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-15 02:04:43,181 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2022-02-15 02:04:43,181 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=1598, Unknown=0, NotChecked=0, Total=1722 [2022-02-15 02:04:43,182 INFO L87 Difference]: Start difference. First operand 61 states and 63 transitions. Second operand has 39 states, 38 states have (on average 1.4473684210526316) internal successors, (55), 37 states have internal predecessors, (55), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:04:47,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-15 02:04:47,018 INFO L93 Difference]: Finished difference Result 73 states and 78 transitions. [2022-02-15 02:04:47,019 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-02-15 02:04:47,019 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 38 states have (on average 1.4473684210526316) internal successors, (55), 37 states have internal predecessors, (55), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 59 [2022-02-15 02:04:47,019 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-15 02:04:47,020 INFO L225 Difference]: With dead ends: 73 [2022-02-15 02:04:47,020 INFO L226 Difference]: Without dead ends: 65 [2022-02-15 02:04:47,021 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 4 SyntacticMatches, 16 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 948 ImplicationChecksByTransitivity, 5.8s TimeCoverageRelationStatistics Valid=298, Invalid=5252, Unknown=0, NotChecked=0, Total=5550 [2022-02-15 02:04:47,023 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 33 mSDsluCounter, 177 mSDsCounter, 0 mSdLazyCounter, 2032 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 188 SdHoareTripleChecker+Invalid, 2070 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 2032 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2022-02-15 02:04:47,023 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 188 Invalid, 2070 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 2032 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2022-02-15 02:04:47,023 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2022-02-15 02:04:47,063 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 64. [2022-02-15 02:04:47,063 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 59 states have (on average 1.0508474576271187) internal successors, (62), 59 states have internal predecessors, (62), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:04:47,064 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 66 transitions. [2022-02-15 02:04:47,064 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 66 transitions. Word has length 59 [2022-02-15 02:04:47,064 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-15 02:04:47,064 INFO L470 AbstractCegarLoop]: Abstraction has 64 states and 66 transitions. [2022-02-15 02:04:47,064 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 38 states have (on average 1.4473684210526316) internal successors, (55), 37 states have internal predecessors, (55), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:04:47,065 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 66 transitions. [2022-02-15 02:04:47,065 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2022-02-15 02:04:47,065 INFO L506 BasicCegarLoop]: Found error trace [2022-02-15 02:04:47,065 INFO L514 BasicCegarLoop]: trace histogram [17, 17, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-15 02:04:47,065 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2022-02-15 02:04:47,065 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-15 02:04:47,066 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-15 02:04:47,066 INFO L85 PathProgramCache]: Analyzing trace with hash -1656839220, now seen corresponding path program 16 times [2022-02-15 02:04:47,066 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-15 02:04:47,066 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [260152581] [2022-02-15 02:04:47,066 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-15 02:04:49,252 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:04:49,473 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:04:49,473 INFO L262 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-15 02:04:49,532 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:04:49,631 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:04:49,632 INFO L262 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-15 02:04:49,632 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-15 02:04:49,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 02:04:49,825 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-15 02:04:49,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 02:04:49,831 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-15 02:05:41,471 WARN L228 SmtUtils]: Spent 5.57s on a formula simplification. DAG size of input: 87 DAG size of output: 85 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-02-15 02:08:33,511 WARN L838 $PredicateComparison]: unable to prove that (let ((.cse0 (+ 5000016 c_main_~z~0))) (and (<= (div c_main_~y~0 4294967296) 0) (<= c_main_~y~0 .cse0) (<= 5000000 (mod (+ c_main_~x~0 4294967280) 4294967296)) (<= 10000000 c_main_~y~0) (not (<= 5000000 (mod (+ 4294967279 c_main_~x~0) 4294967296))) (<= .cse0 c_main_~y~0) (exists ((v_main_~x~0_304 Int) (|v_main_#t~post5_166| Int) (v_main_~z~0_203 Int) (|v_main_#t~post4_84| Int) (|v_main_#t~post4_83| Int) (|v_main_#t~post5_167| Int)) (and (let ((.cse1 (not (<= (+ (div v_main_~x~0_304 4294967296) 1) 0)))) (or (and .cse1 (<= (+ 5000000 v_main_~x~0_304) c_main_~y~0)) (and .cse1 (let ((.cse2 (* (div v_main_~z~0_203 4294967296) 4294967296))) (or (<= (+ v_main_~x~0_304 (* 4294967296 (div c_main_~y~0 4294967296)) v_main_~z~0_203) (+ .cse2 c_main_~y~0)) (<= v_main_~z~0_203 .cse2)))))) (let ((.cse9 (mod c_main_~y~0 4294967296)) (.cse10 (mod v_main_~x~0_304 4294967296))) (let ((.cse4 (<= 5000000 .cse10)) (.cse3 (< .cse10 .cse9)) (.cse5 (= |v_main_#t~post4_84| |v_main_#t~post4_83|)) (.cse6 (= v_main_~z~0_203 (+ 16 c_main_~z~0))) (.cse7 (= |v_main_#t~post5_167| |v_main_#t~post5_166|)) (.cse8 (= (+ v_main_~x~0_304 16) (+ (- 1) c_main_~x~0)))) (or (and (or (not .cse3) (not .cse4)) .cse5 .cse6 .cse7 .cse8) (and (= (+ v_main_~x~0_304 v_main_~z~0_203) (+ (- 1) c_main_~x~0 c_main_~z~0)) (< (+ v_main_~x~0_304 17) c_main_~x~0) .cse4 (<= (div (+ (* (- 1) c_main_~x~0) 17 .cse9) (- 4294967296)) (+ (div (+ v_main_~x~0_304 (- 4294967295)) 4294967296) 1)) .cse3) (and .cse5 .cse6 .cse7 .cse8)))))))) is different from false [2022-02-15 02:08:33,514 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-15 02:08:33,514 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [260152581] [2022-02-15 02:08:33,514 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [260152581] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-15 02:08:33,514 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-15 02:08:33,514 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [41] imperfect sequences [] total 41 [2022-02-15 02:08:33,514 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [275603564] [2022-02-15 02:08:33,514 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-15 02:08:33,514 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2022-02-15 02:08:33,514 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-15 02:08:33,515 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2022-02-15 02:08:33,515 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=1676, Unknown=6, NotChecked=82, Total=1892 [2022-02-15 02:08:33,515 INFO L87 Difference]: Start difference. First operand 64 states and 66 transitions. Second operand has 41 states, 40 states have (on average 1.45) internal successors, (58), 39 states have internal predecessors, (58), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:08:33,702 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-15 02:08:33,702 INFO L93 Difference]: Finished difference Result 71 states and 73 transitions. [2022-02-15 02:08:33,703 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2022-02-15 02:08:33,705 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 40 states have (on average 1.45) internal successors, (58), 39 states have internal predecessors, (58), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 62 [2022-02-15 02:08:33,705 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-15 02:08:33,705 INFO L225 Difference]: With dead ends: 71 [2022-02-15 02:08:33,705 INFO L226 Difference]: Without dead ends: 66 [2022-02-15 02:08:33,706 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 4 SyntacticMatches, 17 SemanticMatches, 45 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 416 ImplicationChecksByTransitivity, 223.1s TimeCoverageRelationStatistics Valid=144, Invalid=1924, Unknown=6, NotChecked=88, Total=2162 [2022-02-15 02:08:33,707 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 6 mSDsluCounter, 228 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 237 SdHoareTripleChecker+Invalid, 242 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 224 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-02-15 02:08:33,707 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 237 Invalid, 242 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 15 Invalid, 0 Unknown, 224 Unchecked, 0.0s Time] [2022-02-15 02:08:33,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2022-02-15 02:08:33,742 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 66. [2022-02-15 02:08:33,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 61 states have (on average 1.0491803278688525) internal successors, (64), 61 states have internal predecessors, (64), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:08:33,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 68 transitions. [2022-02-15 02:08:33,742 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 68 transitions. Word has length 62 [2022-02-15 02:08:33,743 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-15 02:08:33,743 INFO L470 AbstractCegarLoop]: Abstraction has 66 states and 68 transitions. [2022-02-15 02:08:33,743 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 40 states have (on average 1.45) internal successors, (58), 39 states have internal predecessors, (58), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:08:33,743 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 68 transitions. [2022-02-15 02:08:33,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2022-02-15 02:08:33,743 INFO L506 BasicCegarLoop]: Found error trace [2022-02-15 02:08:33,743 INFO L514 BasicCegarLoop]: trace histogram [18, 18, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-15 02:08:33,743 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2022-02-15 02:08:33,744 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-15 02:08:33,744 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-15 02:08:33,744 INFO L85 PathProgramCache]: Analyzing trace with hash 534700898, now seen corresponding path program 17 times [2022-02-15 02:08:33,744 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-15 02:08:33,744 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1221474964] [2022-02-15 02:08:33,744 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-15 02:08:33,864 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:08:34,058 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:08:34,058 INFO L262 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-15 02:08:34,123 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:08:34,188 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:08:34,189 INFO L262 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-15 02:08:34,189 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-15 02:08:34,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 02:08:34,370 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-15 02:08:34,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 02:08:34,373 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-15 02:08:39,174 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-15 02:08:39,174 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1221474964] [2022-02-15 02:08:39,174 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1221474964] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-15 02:08:39,174 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-15 02:08:39,174 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [43] imperfect sequences [] total 43 [2022-02-15 02:08:39,175 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1492577303] [2022-02-15 02:08:39,175 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-15 02:08:39,175 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2022-02-15 02:08:39,175 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-15 02:08:39,175 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2022-02-15 02:08:39,176 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=137, Invalid=1933, Unknown=0, NotChecked=0, Total=2070 [2022-02-15 02:08:39,176 INFO L87 Difference]: Start difference. First operand 66 states and 68 transitions. Second operand has 43 states, 42 states have (on average 1.4523809523809523) internal successors, (61), 41 states have internal predecessors, (61), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:08:43,786 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-15 02:08:43,786 INFO L93 Difference]: Finished difference Result 79 states and 85 transitions. [2022-02-15 02:08:43,786 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-02-15 02:08:43,786 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 42 states have (on average 1.4523809523809523) internal successors, (61), 41 states have internal predecessors, (61), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 65 [2022-02-15 02:08:43,787 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-15 02:08:43,787 INFO L225 Difference]: With dead ends: 79 [2022-02-15 02:08:43,787 INFO L226 Difference]: Without dead ends: 71 [2022-02-15 02:08:43,789 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 4 SyntacticMatches, 18 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1143 ImplicationChecksByTransitivity, 7.1s TimeCoverageRelationStatistics Valid=331, Invalid=6475, Unknown=0, NotChecked=0, Total=6806 [2022-02-15 02:08:43,789 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 35 mSDsluCounter, 192 mSDsCounter, 0 mSdLazyCounter, 2440 mSolverCounterSat, 43 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 203 SdHoareTripleChecker+Invalid, 2483 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 43 IncrementalHoareTripleChecker+Valid, 2440 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2022-02-15 02:08:43,790 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [35 Valid, 203 Invalid, 2483 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [43 Valid, 2440 Invalid, 0 Unknown, 0 Unchecked, 2.0s Time] [2022-02-15 02:08:43,790 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2022-02-15 02:08:43,840 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 70. [2022-02-15 02:08:43,841 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 65 states have (on average 1.0461538461538462) internal successors, (68), 65 states have internal predecessors, (68), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:08:43,841 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 72 transitions. [2022-02-15 02:08:43,841 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 72 transitions. Word has length 65 [2022-02-15 02:08:43,841 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-15 02:08:43,841 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 72 transitions. [2022-02-15 02:08:43,842 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 42 states have (on average 1.4523809523809523) internal successors, (61), 41 states have internal predecessors, (61), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:08:43,842 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 72 transitions. [2022-02-15 02:08:43,842 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2022-02-15 02:08:43,842 INFO L506 BasicCegarLoop]: Found error trace [2022-02-15 02:08:43,842 INFO L514 BasicCegarLoop]: trace histogram [19, 19, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-15 02:08:43,842 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2022-02-15 02:08:43,843 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-15 02:08:43,843 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-15 02:08:43,843 INFO L85 PathProgramCache]: Analyzing trace with hash 908489740, now seen corresponding path program 18 times [2022-02-15 02:08:43,843 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-15 02:08:43,843 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1703527535] [2022-02-15 02:08:43,843 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-15 02:08:43,974 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:08:44,132 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:08:44,133 INFO L262 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-15 02:08:44,227 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:08:44,316 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:08:44,316 INFO L262 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-15 02:08:44,316 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-15 02:08:44,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 02:08:44,503 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-15 02:08:44,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 02:08:44,507 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-15 02:09:14,775 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-15 02:09:14,775 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1703527535] [2022-02-15 02:09:14,776 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1703527535] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-15 02:09:14,776 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-15 02:09:14,776 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [45] imperfect sequences [] total 45 [2022-02-15 02:09:14,776 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [654162049] [2022-02-15 02:09:14,776 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-15 02:09:14,776 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2022-02-15 02:09:14,776 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-15 02:09:14,777 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2022-02-15 02:09:14,777 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=2114, Unknown=0, NotChecked=0, Total=2256 [2022-02-15 02:09:14,777 INFO L87 Difference]: Start difference. First operand 70 states and 72 transitions. Second operand has 45 states, 44 states have (on average 1.4545454545454546) internal successors, (64), 43 states have internal predecessors, (64), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:09:15,045 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-15 02:09:15,045 INFO L93 Difference]: Finished difference Result 77 states and 79 transitions. [2022-02-15 02:09:15,045 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2022-02-15 02:09:15,045 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 44 states have (on average 1.4545454545454546) internal successors, (64), 43 states have internal predecessors, (64), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 68 [2022-02-15 02:09:15,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-15 02:09:15,046 INFO L225 Difference]: With dead ends: 77 [2022-02-15 02:09:15,046 INFO L226 Difference]: Without dead ends: 72 [2022-02-15 02:09:15,047 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 4 SyntacticMatches, 19 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 475 ImplicationChecksByTransitivity, 29.7s TimeCoverageRelationStatistics Valid=158, Invalid=2392, Unknown=0, NotChecked=0, Total=2550 [2022-02-15 02:09:15,047 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 6 mSDsluCounter, 241 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 250 SdHoareTripleChecker+Invalid, 226 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 208 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-02-15 02:09:15,048 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 250 Invalid, 226 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 15 Invalid, 0 Unknown, 208 Unchecked, 0.0s Time] [2022-02-15 02:09:15,048 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2022-02-15 02:09:15,120 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 72. [2022-02-15 02:09:15,120 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 67 states have (on average 1.044776119402985) internal successors, (70), 67 states have internal predecessors, (70), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:09:15,121 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 74 transitions. [2022-02-15 02:09:15,121 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 74 transitions. Word has length 68 [2022-02-15 02:09:15,121 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-15 02:09:15,121 INFO L470 AbstractCegarLoop]: Abstraction has 72 states and 74 transitions. [2022-02-15 02:09:15,121 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 44 states have (on average 1.4545454545454546) internal successors, (64), 43 states have internal predecessors, (64), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:09:15,121 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 74 transitions. [2022-02-15 02:09:15,122 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2022-02-15 02:09:15,122 INFO L506 BasicCegarLoop]: Found error trace [2022-02-15 02:09:15,122 INFO L514 BasicCegarLoop]: trace histogram [20, 20, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-15 02:09:15,122 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2022-02-15 02:09:15,122 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-15 02:09:15,122 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-15 02:09:15,123 INFO L85 PathProgramCache]: Analyzing trace with hash -398316766, now seen corresponding path program 19 times [2022-02-15 02:09:15,123 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-15 02:09:15,123 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1547190778] [2022-02-15 02:09:15,123 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-15 02:09:15,273 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:09:15,417 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:09:15,417 INFO L262 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-15 02:09:15,509 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:09:15,589 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:09:15,589 INFO L262 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-15 02:09:15,589 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-15 02:09:15,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 02:09:15,770 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-15 02:09:15,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 02:09:15,780 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-15 02:09:21,877 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-15 02:09:21,877 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1547190778] [2022-02-15 02:09:21,877 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1547190778] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-15 02:09:21,878 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-15 02:09:21,878 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [47] imperfect sequences [] total 47 [2022-02-15 02:09:21,878 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1920883979] [2022-02-15 02:09:21,878 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-15 02:09:21,878 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2022-02-15 02:09:21,878 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-15 02:09:21,878 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2022-02-15 02:09:21,879 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=148, Invalid=2302, Unknown=0, NotChecked=0, Total=2450 [2022-02-15 02:09:21,879 INFO L87 Difference]: Start difference. First operand 72 states and 74 transitions. Second operand has 47 states, 46 states have (on average 1.4565217391304348) internal successors, (67), 45 states have internal predecessors, (67), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:09:27,581 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-15 02:09:27,581 INFO L93 Difference]: Finished difference Result 85 states and 91 transitions. [2022-02-15 02:09:27,583 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2022-02-15 02:09:27,584 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 46 states have (on average 1.4565217391304348) internal successors, (67), 45 states have internal predecessors, (67), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 71 [2022-02-15 02:09:27,584 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-15 02:09:27,584 INFO L225 Difference]: With dead ends: 85 [2022-02-15 02:09:27,585 INFO L226 Difference]: Without dead ends: 77 [2022-02-15 02:09:27,585 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 4 SyntacticMatches, 20 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1348 ImplicationChecksByTransitivity, 8.9s TimeCoverageRelationStatistics Valid=362, Invalid=7828, Unknown=0, NotChecked=0, Total=8190 [2022-02-15 02:09:27,586 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 36 mSDsluCounter, 217 mSDsCounter, 0 mSdLazyCounter, 3011 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 228 SdHoareTripleChecker+Invalid, 3058 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 3011 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.6s IncrementalHoareTripleChecker+Time [2022-02-15 02:09:27,586 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [36 Valid, 228 Invalid, 3058 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 3011 Invalid, 0 Unknown, 0 Unchecked, 2.6s Time] [2022-02-15 02:09:27,586 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2022-02-15 02:09:27,635 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 76. [2022-02-15 02:09:27,635 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 71 states have (on average 1.0422535211267605) internal successors, (74), 71 states have internal predecessors, (74), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:09:27,635 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 78 transitions. [2022-02-15 02:09:27,635 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 78 transitions. Word has length 71 [2022-02-15 02:09:27,636 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-15 02:09:27,636 INFO L470 AbstractCegarLoop]: Abstraction has 76 states and 78 transitions. [2022-02-15 02:09:27,636 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 46 states have (on average 1.4565217391304348) internal successors, (67), 45 states have internal predecessors, (67), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:09:27,636 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 78 transitions. [2022-02-15 02:09:27,636 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2022-02-15 02:09:27,636 INFO L506 BasicCegarLoop]: Found error trace [2022-02-15 02:09:27,636 INFO L514 BasicCegarLoop]: trace histogram [21, 21, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-15 02:09:27,636 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2022-02-15 02:09:27,636 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-15 02:09:27,637 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-15 02:09:27,637 INFO L85 PathProgramCache]: Analyzing trace with hash -1887366068, now seen corresponding path program 20 times [2022-02-15 02:09:27,637 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-15 02:09:27,637 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1517689539] [2022-02-15 02:09:27,637 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-15 02:09:27,791 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:09:28,100 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:09:28,100 INFO L262 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-15 02:09:28,157 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:09:28,345 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:09:28,346 INFO L262 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-15 02:09:28,346 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-15 02:09:28,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 02:09:28,485 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-15 02:09:28,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 02:09:28,488 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-15 02:09:34,818 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-15 02:09:34,818 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1517689539] [2022-02-15 02:09:34,819 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1517689539] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-15 02:09:34,819 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-15 02:09:34,819 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [49] imperfect sequences [] total 49 [2022-02-15 02:09:34,819 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1341541877] [2022-02-15 02:09:34,819 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-15 02:09:34,819 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2022-02-15 02:09:34,819 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-15 02:09:34,819 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2022-02-15 02:09:34,820 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=154, Invalid=2498, Unknown=0, NotChecked=0, Total=2652 [2022-02-15 02:09:34,820 INFO L87 Difference]: Start difference. First operand 76 states and 78 transitions. Second operand has 49 states, 48 states have (on average 1.4583333333333333) internal successors, (70), 47 states have internal predecessors, (70), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:09:41,518 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-15 02:09:41,518 INFO L93 Difference]: Finished difference Result 88 states and 93 transitions. [2022-02-15 02:09:41,525 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2022-02-15 02:09:41,525 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 48 states have (on average 1.4583333333333333) internal successors, (70), 47 states have internal predecessors, (70), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 74 [2022-02-15 02:09:41,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-15 02:09:41,525 INFO L225 Difference]: With dead ends: 88 [2022-02-15 02:09:41,525 INFO L226 Difference]: Without dead ends: 80 [2022-02-15 02:09:41,526 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 4 SyntacticMatches, 21 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1458 ImplicationChecksByTransitivity, 9.7s TimeCoverageRelationStatistics Valid=378, Invalid=8552, Unknown=0, NotChecked=0, Total=8930 [2022-02-15 02:09:41,527 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 37 mSDsluCounter, 232 mSDsCounter, 0 mSdLazyCounter, 3353 mSolverCounterSat, 48 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 243 SdHoareTripleChecker+Invalid, 3401 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 48 IncrementalHoareTripleChecker+Valid, 3353 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.0s IncrementalHoareTripleChecker+Time [2022-02-15 02:09:41,527 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 243 Invalid, 3401 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [48 Valid, 3353 Invalid, 0 Unknown, 0 Unchecked, 3.0s Time] [2022-02-15 02:09:41,527 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2022-02-15 02:09:41,584 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 79. [2022-02-15 02:09:41,584 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 74 states have (on average 1.0405405405405406) internal successors, (77), 74 states have internal predecessors, (77), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:09:41,584 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 81 transitions. [2022-02-15 02:09:41,585 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 81 transitions. Word has length 74 [2022-02-15 02:09:41,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-15 02:09:41,585 INFO L470 AbstractCegarLoop]: Abstraction has 79 states and 81 transitions. [2022-02-15 02:09:41,585 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 48 states have (on average 1.4583333333333333) internal successors, (70), 47 states have internal predecessors, (70), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:09:41,585 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 81 transitions. [2022-02-15 02:09:41,585 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2022-02-15 02:09:41,585 INFO L506 BasicCegarLoop]: Found error trace [2022-02-15 02:09:41,585 INFO L514 BasicCegarLoop]: trace histogram [22, 22, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-15 02:09:41,585 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2022-02-15 02:09:41,585 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-15 02:09:41,586 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-15 02:09:41,586 INFO L85 PathProgramCache]: Analyzing trace with hash 562078434, now seen corresponding path program 21 times [2022-02-15 02:09:41,586 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-15 02:09:41,586 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [32145954] [2022-02-15 02:09:41,586 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-15 02:09:42,087 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:09:42,306 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:09:42,306 INFO L262 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-15 02:09:42,382 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:09:42,453 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:09:42,453 INFO L262 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-15 02:09:42,453 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-15 02:09:42,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 02:09:42,650 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-15 02:09:42,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 02:09:42,653 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-15 02:09:49,117 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-15 02:09:49,117 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [32145954] [2022-02-15 02:09:49,117 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [32145954] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-15 02:09:49,117 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-15 02:09:49,117 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [51] imperfect sequences [] total 51 [2022-02-15 02:09:49,117 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1791771051] [2022-02-15 02:09:49,117 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-15 02:09:49,118 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2022-02-15 02:09:49,118 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-15 02:09:49,118 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2022-02-15 02:09:49,118 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=160, Invalid=2702, Unknown=0, NotChecked=0, Total=2862 [2022-02-15 02:09:49,118 INFO L87 Difference]: Start difference. First operand 79 states and 81 transitions. Second operand has 51 states, 50 states have (on average 1.46) internal successors, (73), 49 states have internal predecessors, (73), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:09:56,008 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-15 02:09:56,009 INFO L93 Difference]: Finished difference Result 91 states and 96 transitions. [2022-02-15 02:09:56,009 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2022-02-15 02:09:56,009 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 50 states have (on average 1.46) internal successors, (73), 49 states have internal predecessors, (73), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 77 [2022-02-15 02:09:56,009 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-15 02:09:56,009 INFO L225 Difference]: With dead ends: 91 [2022-02-15 02:09:56,009 INFO L226 Difference]: Without dead ends: 83 [2022-02-15 02:09:56,010 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 4 SyntacticMatches, 22 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1572 ImplicationChecksByTransitivity, 9.9s TimeCoverageRelationStatistics Valid=394, Invalid=9308, Unknown=0, NotChecked=0, Total=9702 [2022-02-15 02:09:56,011 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 38 mSDsluCounter, 237 mSDsCounter, 0 mSdLazyCounter, 3573 mSolverCounterSat, 50 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 248 SdHoareTripleChecker+Invalid, 3623 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 50 IncrementalHoareTripleChecker+Valid, 3573 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.2s IncrementalHoareTripleChecker+Time [2022-02-15 02:09:56,011 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 248 Invalid, 3623 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [50 Valid, 3573 Invalid, 0 Unknown, 0 Unchecked, 3.2s Time] [2022-02-15 02:09:56,011 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2022-02-15 02:09:56,065 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 82. [2022-02-15 02:09:56,065 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 77 states have (on average 1.0389610389610389) internal successors, (80), 77 states have internal predecessors, (80), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:09:56,065 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 84 transitions. [2022-02-15 02:09:56,066 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 84 transitions. Word has length 77 [2022-02-15 02:09:56,066 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-15 02:09:56,066 INFO L470 AbstractCegarLoop]: Abstraction has 82 states and 84 transitions. [2022-02-15 02:09:56,066 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 50 states have (on average 1.46) internal successors, (73), 49 states have internal predecessors, (73), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:09:56,066 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 84 transitions. [2022-02-15 02:09:56,066 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2022-02-15 02:09:56,066 INFO L506 BasicCegarLoop]: Found error trace [2022-02-15 02:09:56,066 INFO L514 BasicCegarLoop]: trace histogram [23, 23, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-15 02:09:56,066 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2022-02-15 02:09:56,067 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-15 02:09:56,067 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-15 02:09:56,067 INFO L85 PathProgramCache]: Analyzing trace with hash 468878476, now seen corresponding path program 22 times [2022-02-15 02:09:56,067 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-15 02:09:56,067 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1949610404] [2022-02-15 02:09:56,067 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-15 02:09:56,228 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:09:58,481 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:09:58,481 INFO L262 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-15 02:09:58,555 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:09:58,635 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:09:58,635 INFO L262 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-15 02:09:58,635 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-15 02:09:58,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 02:09:58,805 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-15 02:09:58,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 02:09:58,807 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-15 02:10:52,658 WARN L228 SmtUtils]: Spent 6.33s on a formula simplification. DAG size of input: 92 DAG size of output: 90 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-02-15 02:11:06,334 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-15 02:11:06,334 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1949610404] [2022-02-15 02:11:06,334 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1949610404] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-15 02:11:06,334 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-15 02:11:06,334 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [53] imperfect sequences [] total 53 [2022-02-15 02:11:06,334 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1529198114] [2022-02-15 02:11:06,334 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-15 02:11:06,335 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2022-02-15 02:11:06,335 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-15 02:11:06,335 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2022-02-15 02:11:06,335 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=2914, Unknown=0, NotChecked=0, Total=3080 [2022-02-15 02:11:06,336 INFO L87 Difference]: Start difference. First operand 82 states and 84 transitions. Second operand has 53 states, 52 states have (on average 1.4615384615384615) internal successors, (76), 51 states have internal predecessors, (76), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:11:06,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-15 02:11:06,694 INFO L93 Difference]: Finished difference Result 89 states and 91 transitions. [2022-02-15 02:11:06,695 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2022-02-15 02:11:06,695 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 52 states have (on average 1.4615384615384615) internal successors, (76), 51 states have internal predecessors, (76), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 80 [2022-02-15 02:11:06,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-15 02:11:06,695 INFO L225 Difference]: With dead ends: 89 [2022-02-15 02:11:06,695 INFO L226 Difference]: Without dead ends: 84 [2022-02-15 02:11:06,696 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 4 SyntacticMatches, 23 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 575 ImplicationChecksByTransitivity, 66.7s TimeCoverageRelationStatistics Valid=182, Invalid=3240, Unknown=0, NotChecked=0, Total=3422 [2022-02-15 02:11:06,696 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 6 mSDsluCounter, 289 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 298 SdHoareTripleChecker+Invalid, 315 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 297 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-02-15 02:11:06,696 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 298 Invalid, 315 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 15 Invalid, 0 Unknown, 297 Unchecked, 0.0s Time] [2022-02-15 02:11:06,696 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2022-02-15 02:11:06,766 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 84. [2022-02-15 02:11:06,767 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 79 states have (on average 1.0379746835443038) internal successors, (82), 79 states have internal predecessors, (82), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:11:06,767 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 86 transitions. [2022-02-15 02:11:06,767 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 86 transitions. Word has length 80 [2022-02-15 02:11:06,767 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-15 02:11:06,768 INFO L470 AbstractCegarLoop]: Abstraction has 84 states and 86 transitions. [2022-02-15 02:11:06,768 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 52 states have (on average 1.4615384615384615) internal successors, (76), 51 states have internal predecessors, (76), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:11:06,768 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 86 transitions. [2022-02-15 02:11:06,768 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2022-02-15 02:11:06,768 INFO L506 BasicCegarLoop]: Found error trace [2022-02-15 02:11:06,768 INFO L514 BasicCegarLoop]: trace histogram [24, 24, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-15 02:11:06,768 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2022-02-15 02:11:06,768 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-15 02:11:06,768 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-15 02:11:06,769 INFO L85 PathProgramCache]: Analyzing trace with hash -1502197086, now seen corresponding path program 23 times [2022-02-15 02:11:06,769 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-15 02:11:06,769 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1010055141] [2022-02-15 02:11:06,769 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-15 02:11:06,924 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:11:07,062 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:11:07,063 INFO L262 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-15 02:11:07,139 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:11:07,201 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:11:07,201 INFO L262 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-15 02:11:07,201 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-15 02:11:07,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 02:11:07,415 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-15 02:11:07,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 02:11:07,419 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-15 02:11:14,956 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-15 02:11:14,956 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1010055141] [2022-02-15 02:11:14,956 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1010055141] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-15 02:11:14,956 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-15 02:11:14,957 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [55] imperfect sequences [] total 55 [2022-02-15 02:11:14,957 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1129685871] [2022-02-15 02:11:14,957 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-15 02:11:14,957 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2022-02-15 02:11:14,957 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-15 02:11:14,957 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2022-02-15 02:11:14,958 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=172, Invalid=3134, Unknown=0, NotChecked=0, Total=3306 [2022-02-15 02:11:14,958 INFO L87 Difference]: Start difference. First operand 84 states and 86 transitions. Second operand has 55 states, 54 states have (on average 1.462962962962963) internal successors, (79), 53 states have internal predecessors, (79), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:11:23,116 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-15 02:11:23,116 INFO L93 Difference]: Finished difference Result 97 states and 103 transitions. [2022-02-15 02:11:23,116 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2022-02-15 02:11:23,116 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 54 states have (on average 1.462962962962963) internal successors, (79), 53 states have internal predecessors, (79), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 83 [2022-02-15 02:11:23,117 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-15 02:11:23,117 INFO L225 Difference]: With dead ends: 97 [2022-02-15 02:11:23,117 INFO L226 Difference]: Without dead ends: 89 [2022-02-15 02:11:23,118 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 4 SyntacticMatches, 24 SemanticMatches, 105 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1812 ImplicationChecksByTransitivity, 11.5s TimeCoverageRelationStatistics Valid=426, Invalid=10916, Unknown=0, NotChecked=0, Total=11342 [2022-02-15 02:11:23,118 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 40 mSDsluCounter, 262 mSDsCounter, 0 mSdLazyCounter, 4259 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 273 SdHoareTripleChecker+Invalid, 4314 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 4259 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.9s IncrementalHoareTripleChecker+Time [2022-02-15 02:11:23,118 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 273 Invalid, 4314 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 4259 Invalid, 0 Unknown, 0 Unchecked, 3.9s Time] [2022-02-15 02:11:23,118 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2022-02-15 02:11:23,183 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 88. [2022-02-15 02:11:23,184 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 83 states have (on average 1.036144578313253) internal successors, (86), 83 states have internal predecessors, (86), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:11:23,184 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 90 transitions. [2022-02-15 02:11:23,184 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 90 transitions. Word has length 83 [2022-02-15 02:11:23,184 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-15 02:11:23,185 INFO L470 AbstractCegarLoop]: Abstraction has 88 states and 90 transitions. [2022-02-15 02:11:23,185 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 54 states have (on average 1.462962962962963) internal successors, (79), 53 states have internal predecessors, (79), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:11:23,185 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 90 transitions. [2022-02-15 02:11:23,185 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2022-02-15 02:11:23,185 INFO L506 BasicCegarLoop]: Found error trace [2022-02-15 02:11:23,185 INFO L514 BasicCegarLoop]: trace histogram [25, 25, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-15 02:11:23,185 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2022-02-15 02:11:23,185 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-15 02:11:23,186 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-15 02:11:23,186 INFO L85 PathProgramCache]: Analyzing trace with hash -1021393716, now seen corresponding path program 24 times [2022-02-15 02:11:23,186 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-15 02:11:23,186 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [610394142] [2022-02-15 02:11:23,186 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-15 02:11:23,313 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:11:23,481 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:11:23,481 INFO L262 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-15 02:11:23,545 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:11:23,662 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:11:23,662 INFO L262 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-15 02:11:23,663 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-15 02:11:23,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 02:11:23,819 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-15 02:11:23,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 02:11:23,822 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-15 02:11:32,733 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-15 02:11:32,733 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [610394142] [2022-02-15 02:11:32,734 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [610394142] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-15 02:11:32,734 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-15 02:11:32,734 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [57] imperfect sequences [] total 57 [2022-02-15 02:11:32,734 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1417654766] [2022-02-15 02:11:32,734 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-15 02:11:32,734 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 57 states [2022-02-15 02:11:32,734 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-15 02:11:32,735 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2022-02-15 02:11:32,735 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=178, Invalid=3362, Unknown=0, NotChecked=0, Total=3540 [2022-02-15 02:11:32,735 INFO L87 Difference]: Start difference. First operand 88 states and 90 transitions. Second operand has 57 states, 56 states have (on average 1.4642857142857142) internal successors, (82), 55 states have internal predecessors, (82), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:11:41,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-15 02:11:41,411 INFO L93 Difference]: Finished difference Result 100 states and 105 transitions. [2022-02-15 02:11:41,411 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2022-02-15 02:11:41,411 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 56 states have (on average 1.4642857142857142) internal successors, (82), 55 states have internal predecessors, (82), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 86 [2022-02-15 02:11:41,417 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-15 02:11:41,418 INFO L225 Difference]: With dead ends: 100 [2022-02-15 02:11:41,418 INFO L226 Difference]: Without dead ends: 92 [2022-02-15 02:11:41,419 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 4 SyntacticMatches, 25 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1938 ImplicationChecksByTransitivity, 13.3s TimeCoverageRelationStatistics Valid=442, Invalid=11768, Unknown=0, NotChecked=0, Total=12210 [2022-02-15 02:11:41,420 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 42 mSDsluCounter, 267 mSDsCounter, 0 mSdLazyCounter, 4507 mSolverCounterSat, 56 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 278 SdHoareTripleChecker+Invalid, 4563 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 56 IncrementalHoareTripleChecker+Valid, 4507 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.0s IncrementalHoareTripleChecker+Time [2022-02-15 02:11:41,420 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [42 Valid, 278 Invalid, 4563 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [56 Valid, 4507 Invalid, 0 Unknown, 0 Unchecked, 4.0s Time] [2022-02-15 02:11:41,421 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2022-02-15 02:11:41,489 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 91. [2022-02-15 02:11:41,489 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 86 states have (on average 1.0348837209302326) internal successors, (89), 86 states have internal predecessors, (89), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:11:41,490 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 93 transitions. [2022-02-15 02:11:41,490 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 93 transitions. Word has length 86 [2022-02-15 02:11:41,490 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-15 02:11:41,490 INFO L470 AbstractCegarLoop]: Abstraction has 91 states and 93 transitions. [2022-02-15 02:11:41,490 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 57 states, 56 states have (on average 1.4642857142857142) internal successors, (82), 55 states have internal predecessors, (82), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:11:41,491 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 93 transitions. [2022-02-15 02:11:41,491 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2022-02-15 02:11:41,491 INFO L506 BasicCegarLoop]: Found error trace [2022-02-15 02:11:41,491 INFO L514 BasicCegarLoop]: trace histogram [26, 26, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-15 02:11:41,492 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2022-02-15 02:11:41,492 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-15 02:11:41,492 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-15 02:11:41,493 INFO L85 PathProgramCache]: Analyzing trace with hash -1124130206, now seen corresponding path program 25 times [2022-02-15 02:11:41,493 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-15 02:11:41,493 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1051076706] [2022-02-15 02:11:41,493 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-15 02:11:41,637 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:11:41,833 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:11:41,834 INFO L262 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-15 02:11:41,895 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:11:42,029 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:11:42,030 INFO L262 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-15 02:11:42,030 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-15 02:11:42,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 02:11:42,264 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-15 02:11:42,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 02:11:42,269 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-15 02:11:50,843 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-15 02:11:50,843 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1051076706] [2022-02-15 02:11:50,843 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1051076706] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-15 02:11:50,843 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-15 02:11:50,843 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [59] imperfect sequences [] total 59 [2022-02-15 02:11:50,843 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1548294226] [2022-02-15 02:11:50,843 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-15 02:11:50,844 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2022-02-15 02:11:50,844 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-15 02:11:50,844 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2022-02-15 02:11:50,844 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=3598, Unknown=0, NotChecked=0, Total=3782 [2022-02-15 02:11:50,844 INFO L87 Difference]: Start difference. First operand 91 states and 93 transitions. Second operand has 59 states, 58 states have (on average 1.4655172413793103) internal successors, (85), 57 states have internal predecessors, (85), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:12:00,438 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-15 02:12:00,439 INFO L93 Difference]: Finished difference Result 103 states and 108 transitions. [2022-02-15 02:12:00,439 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2022-02-15 02:12:00,439 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 58 states have (on average 1.4655172413793103) internal successors, (85), 57 states have internal predecessors, (85), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 89 [2022-02-15 02:12:00,439 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-15 02:12:00,440 INFO L225 Difference]: With dead ends: 103 [2022-02-15 02:12:00,440 INFO L226 Difference]: Without dead ends: 95 [2022-02-15 02:12:00,440 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 4 SyntacticMatches, 26 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2068 ImplicationChecksByTransitivity, 13.3s TimeCoverageRelationStatistics Valid=458, Invalid=12652, Unknown=0, NotChecked=0, Total=13110 [2022-02-15 02:12:00,441 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 42 mSDsluCounter, 282 mSDsCounter, 0 mSdLazyCounter, 4923 mSolverCounterSat, 58 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 293 SdHoareTripleChecker+Invalid, 4981 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 58 IncrementalHoareTripleChecker+Valid, 4923 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.5s IncrementalHoareTripleChecker+Time [2022-02-15 02:12:00,441 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [42 Valid, 293 Invalid, 4981 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [58 Valid, 4923 Invalid, 0 Unknown, 0 Unchecked, 4.5s Time] [2022-02-15 02:12:00,441 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2022-02-15 02:12:00,508 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 94. [2022-02-15 02:12:00,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 89 states have (on average 1.0337078651685394) internal successors, (92), 89 states have internal predecessors, (92), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:12:00,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 96 transitions. [2022-02-15 02:12:00,510 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 96 transitions. Word has length 89 [2022-02-15 02:12:00,510 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-15 02:12:00,510 INFO L470 AbstractCegarLoop]: Abstraction has 94 states and 96 transitions. [2022-02-15 02:12:00,510 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 59 states, 58 states have (on average 1.4655172413793103) internal successors, (85), 57 states have internal predecessors, (85), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:12:00,510 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 96 transitions. [2022-02-15 02:12:00,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2022-02-15 02:12:00,510 INFO L506 BasicCegarLoop]: Found error trace [2022-02-15 02:12:00,510 INFO L514 BasicCegarLoop]: trace histogram [27, 27, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-15 02:12:00,510 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2022-02-15 02:12:00,511 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-15 02:12:00,511 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-15 02:12:00,511 INFO L85 PathProgramCache]: Analyzing trace with hash 564778252, now seen corresponding path program 26 times [2022-02-15 02:12:00,511 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-15 02:12:00,511 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [474494286] [2022-02-15 02:12:00,511 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-15 02:12:00,652 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:12:00,868 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:12:00,868 INFO L262 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-15 02:12:01,005 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:12:01,090 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:12:01,090 INFO L262 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-15 02:12:01,090 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-15 02:12:01,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 02:12:01,334 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-15 02:12:01,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 02:12:01,337 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-15 02:12:11,552 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-15 02:12:11,552 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [474494286] [2022-02-15 02:12:11,552 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [474494286] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-15 02:12:11,552 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-15 02:12:11,552 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [61] imperfect sequences [] total 61 [2022-02-15 02:12:11,553 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1547806963] [2022-02-15 02:12:11,553 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-15 02:12:11,553 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 61 states [2022-02-15 02:12:11,553 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-15 02:12:11,553 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2022-02-15 02:12:11,553 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=3842, Unknown=0, NotChecked=0, Total=4032 [2022-02-15 02:12:11,554 INFO L87 Difference]: Start difference. First operand 94 states and 96 transitions. Second operand has 61 states, 60 states have (on average 1.4666666666666666) internal successors, (88), 59 states have internal predecessors, (88), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:12:21,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-15 02:12:21,496 INFO L93 Difference]: Finished difference Result 106 states and 111 transitions. [2022-02-15 02:12:21,496 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2022-02-15 02:12:21,497 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 60 states have (on average 1.4666666666666666) internal successors, (88), 59 states have internal predecessors, (88), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 92 [2022-02-15 02:12:21,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-15 02:12:21,497 INFO L225 Difference]: With dead ends: 106 [2022-02-15 02:12:21,497 INFO L226 Difference]: Without dead ends: 98 [2022-02-15 02:12:21,499 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 4 SyntacticMatches, 27 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2202 ImplicationChecksByTransitivity, 15.1s TimeCoverageRelationStatistics Valid=474, Invalid=13568, Unknown=0, NotChecked=0, Total=14042 [2022-02-15 02:12:21,502 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 44 mSDsluCounter, 282 mSDsCounter, 0 mSdLazyCounter, 5104 mSolverCounterSat, 60 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 293 SdHoareTripleChecker+Invalid, 5164 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 60 IncrementalHoareTripleChecker+Valid, 5104 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.6s IncrementalHoareTripleChecker+Time [2022-02-15 02:12:21,502 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 293 Invalid, 5164 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [60 Valid, 5104 Invalid, 0 Unknown, 0 Unchecked, 4.6s Time] [2022-02-15 02:12:21,503 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2022-02-15 02:12:21,568 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 97. [2022-02-15 02:12:21,568 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 92 states have (on average 1.0326086956521738) internal successors, (95), 92 states have internal predecessors, (95), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:12:21,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 99 transitions. [2022-02-15 02:12:21,569 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 99 transitions. Word has length 92 [2022-02-15 02:12:21,569 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-15 02:12:21,569 INFO L470 AbstractCegarLoop]: Abstraction has 97 states and 99 transitions. [2022-02-15 02:12:21,569 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 61 states, 60 states have (on average 1.4666666666666666) internal successors, (88), 59 states have internal predecessors, (88), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:12:21,569 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 99 transitions. [2022-02-15 02:12:21,570 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2022-02-15 02:12:21,570 INFO L506 BasicCegarLoop]: Found error trace [2022-02-15 02:12:21,570 INFO L514 BasicCegarLoop]: trace histogram [28, 28, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-15 02:12:21,570 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2022-02-15 02:12:21,570 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-15 02:12:21,570 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-15 02:12:21,570 INFO L85 PathProgramCache]: Analyzing trace with hash -705222110, now seen corresponding path program 27 times [2022-02-15 02:12:21,571 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-15 02:12:21,571 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1838494771] [2022-02-15 02:12:21,571 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-15 02:12:21,951 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:12:22,069 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:12:22,069 INFO L262 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-15 02:12:22,129 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:12:22,193 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:12:22,193 INFO L262 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-15 02:12:22,193 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-15 02:12:22,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 02:12:22,449 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-15 02:12:22,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 02:12:22,452 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-15 02:12:32,044 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-15 02:12:32,044 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1838494771] [2022-02-15 02:12:32,044 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1838494771] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-15 02:12:32,044 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-15 02:12:32,045 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [63] imperfect sequences [] total 63 [2022-02-15 02:12:32,045 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [740042433] [2022-02-15 02:12:32,045 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-15 02:12:32,045 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 63 states [2022-02-15 02:12:32,045 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-15 02:12:32,045 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2022-02-15 02:12:32,046 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=197, Invalid=4093, Unknown=0, NotChecked=0, Total=4290 [2022-02-15 02:12:32,046 INFO L87 Difference]: Start difference. First operand 97 states and 99 transitions. Second operand has 63 states, 62 states have (on average 1.467741935483871) internal successors, (91), 61 states have internal predecessors, (91), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:12:41,658 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-15 02:12:41,658 INFO L93 Difference]: Finished difference Result 109 states and 114 transitions. [2022-02-15 02:12:41,659 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2022-02-15 02:12:41,659 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 62 states have (on average 1.467741935483871) internal successors, (91), 61 states have internal predecessors, (91), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 95 [2022-02-15 02:12:41,659 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-15 02:12:41,659 INFO L225 Difference]: With dead ends: 109 [2022-02-15 02:12:41,659 INFO L226 Difference]: Without dead ends: 101 [2022-02-15 02:12:41,660 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 4 SyntacticMatches, 28 SemanticMatches, 121 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2343 ImplicationChecksByTransitivity, 14.6s TimeCoverageRelationStatistics Valid=491, Invalid=14515, Unknown=0, NotChecked=0, Total=15006 [2022-02-15 02:12:41,661 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 45 mSDsluCounter, 297 mSDsCounter, 0 mSdLazyCounter, 5548 mSolverCounterSat, 62 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 308 SdHoareTripleChecker+Invalid, 5610 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 62 IncrementalHoareTripleChecker+Valid, 5548 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.3s IncrementalHoareTripleChecker+Time [2022-02-15 02:12:41,661 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [45 Valid, 308 Invalid, 5610 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [62 Valid, 5548 Invalid, 0 Unknown, 0 Unchecked, 4.3s Time] [2022-02-15 02:12:41,661 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2022-02-15 02:12:41,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 100. [2022-02-15 02:12:41,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 95 states have (on average 1.0315789473684212) internal successors, (98), 95 states have internal predecessors, (98), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:12:41,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 102 transitions. [2022-02-15 02:12:41,760 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 102 transitions. Word has length 95 [2022-02-15 02:12:41,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-15 02:12:41,760 INFO L470 AbstractCegarLoop]: Abstraction has 100 states and 102 transitions. [2022-02-15 02:12:41,760 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 63 states, 62 states have (on average 1.467741935483871) internal successors, (91), 61 states have internal predecessors, (91), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:12:41,760 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 102 transitions. [2022-02-15 02:12:41,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2022-02-15 02:12:41,760 INFO L506 BasicCegarLoop]: Found error trace [2022-02-15 02:12:41,761 INFO L514 BasicCegarLoop]: trace histogram [29, 29, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-15 02:12:41,761 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2022-02-15 02:12:41,761 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-15 02:12:41,761 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-15 02:12:41,761 INFO L85 PathProgramCache]: Analyzing trace with hash -919095988, now seen corresponding path program 28 times [2022-02-15 02:12:41,761 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-15 02:12:41,761 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [759113174] [2022-02-15 02:12:41,761 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-15 02:12:41,906 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:12:42,071 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:12:42,072 INFO L262 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-15 02:12:42,150 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:12:42,214 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:12:42,215 INFO L262 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-15 02:12:42,215 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-15 02:12:42,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 02:12:42,429 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-15 02:12:42,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 02:12:42,432 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-15 02:12:53,166 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-15 02:12:53,166 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [759113174] [2022-02-15 02:12:53,166 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [759113174] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-15 02:12:53,166 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-15 02:12:53,166 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [65] imperfect sequences [] total 65 [2022-02-15 02:12:53,166 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1395428825] [2022-02-15 02:12:53,166 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-15 02:12:53,167 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 65 states [2022-02-15 02:12:53,167 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-15 02:12:53,167 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2022-02-15 02:12:53,167 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=202, Invalid=4354, Unknown=0, NotChecked=0, Total=4556 [2022-02-15 02:12:53,168 INFO L87 Difference]: Start difference. First operand 100 states and 102 transitions. Second operand has 65 states, 64 states have (on average 1.46875) internal successors, (94), 63 states have internal predecessors, (94), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:13:04,246 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-15 02:13:04,246 INFO L93 Difference]: Finished difference Result 112 states and 117 transitions. [2022-02-15 02:13:04,246 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2022-02-15 02:13:04,246 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 64 states have (on average 1.46875) internal successors, (94), 63 states have internal predecessors, (94), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 98 [2022-02-15 02:13:04,247 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-15 02:13:04,247 INFO L225 Difference]: With dead ends: 112 [2022-02-15 02:13:04,247 INFO L226 Difference]: Without dead ends: 104 [2022-02-15 02:13:04,248 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 4 SyntacticMatches, 29 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2482 ImplicationChecksByTransitivity, 16.2s TimeCoverageRelationStatistics Valid=506, Invalid=15496, Unknown=0, NotChecked=0, Total=16002 [2022-02-15 02:13:04,249 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 46 mSDsluCounter, 302 mSDsCounter, 0 mSdLazyCounter, 5828 mSolverCounterSat, 64 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 313 SdHoareTripleChecker+Invalid, 5892 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 64 IncrementalHoareTripleChecker+Valid, 5828 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.3s IncrementalHoareTripleChecker+Time [2022-02-15 02:13:04,249 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [46 Valid, 313 Invalid, 5892 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [64 Valid, 5828 Invalid, 0 Unknown, 0 Unchecked, 5.3s Time] [2022-02-15 02:13:04,250 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2022-02-15 02:13:04,333 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 103. [2022-02-15 02:13:04,333 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 98 states have (on average 1.030612244897959) internal successors, (101), 98 states have internal predecessors, (101), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:13:04,334 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 105 transitions. [2022-02-15 02:13:04,334 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 105 transitions. Word has length 98 [2022-02-15 02:13:04,334 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-15 02:13:04,334 INFO L470 AbstractCegarLoop]: Abstraction has 103 states and 105 transitions. [2022-02-15 02:13:04,334 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 65 states, 64 states have (on average 1.46875) internal successors, (94), 63 states have internal predecessors, (94), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:13:04,335 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 105 transitions. [2022-02-15 02:13:04,335 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2022-02-15 02:13:04,335 INFO L506 BasicCegarLoop]: Found error trace [2022-02-15 02:13:04,335 INFO L514 BasicCegarLoop]: trace histogram [30, 30, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-15 02:13:04,335 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2022-02-15 02:13:04,335 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-15 02:13:04,336 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-15 02:13:04,336 INFO L85 PathProgramCache]: Analyzing trace with hash 1295671778, now seen corresponding path program 29 times [2022-02-15 02:13:04,336 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-15 02:13:04,336 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1011925813] [2022-02-15 02:13:04,336 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-15 02:13:04,469 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:13:04,651 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:13:04,651 INFO L262 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-15 02:13:04,734 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:13:04,816 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:13:04,817 INFO L262 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-15 02:13:04,817 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-15 02:13:04,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 02:13:05,053 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-15 02:13:05,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 02:13:05,058 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-15 02:14:53,443 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-15 02:14:53,443 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1011925813] [2022-02-15 02:14:53,443 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [1011925813] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-15 02:14:53,443 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-15 02:14:53,443 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [67] imperfect sequences [] total 67 [2022-02-15 02:14:53,443 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1314384757] [2022-02-15 02:14:53,443 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-15 02:14:53,444 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 67 states [2022-02-15 02:14:53,444 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-15 02:14:53,444 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2022-02-15 02:14:53,444 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=208, Invalid=4622, Unknown=0, NotChecked=0, Total=4830 [2022-02-15 02:14:53,444 INFO L87 Difference]: Start difference. First operand 103 states and 105 transitions. Second operand has 67 states, 66 states have (on average 1.4696969696969697) internal successors, (97), 65 states have internal predecessors, (97), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:14:53,764 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-15 02:14:53,764 INFO L93 Difference]: Finished difference Result 110 states and 112 transitions. [2022-02-15 02:14:53,764 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2022-02-15 02:14:53,764 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 66 states have (on average 1.4696969696969697) internal successors, (97), 65 states have internal predecessors, (97), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 101 [2022-02-15 02:14:53,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-15 02:14:53,765 INFO L225 Difference]: With dead ends: 110 [2022-02-15 02:14:53,765 INFO L226 Difference]: Without dead ends: 105 [2022-02-15 02:14:53,765 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 4 SyntacticMatches, 30 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 750 ImplicationChecksByTransitivity, 107.3s TimeCoverageRelationStatistics Valid=224, Invalid=5032, Unknown=0, NotChecked=0, Total=5256 [2022-02-15 02:14:53,766 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 6 mSDsluCounter, 379 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 388 SdHoareTripleChecker+Invalid, 350 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 332 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-02-15 02:14:53,766 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 388 Invalid, 350 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 15 Invalid, 0 Unknown, 332 Unchecked, 0.0s Time] [2022-02-15 02:14:53,766 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2022-02-15 02:14:53,860 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 105. [2022-02-15 02:14:53,860 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 105 states, 100 states have (on average 1.03) internal successors, (103), 100 states have internal predecessors, (103), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:14:53,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 107 transitions. [2022-02-15 02:14:53,861 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 107 transitions. Word has length 101 [2022-02-15 02:14:53,861 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-15 02:14:53,861 INFO L470 AbstractCegarLoop]: Abstraction has 105 states and 107 transitions. [2022-02-15 02:14:53,861 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 67 states, 66 states have (on average 1.4696969696969697) internal successors, (97), 65 states have internal predecessors, (97), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:14:53,861 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 107 transitions. [2022-02-15 02:14:53,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2022-02-15 02:14:53,862 INFO L506 BasicCegarLoop]: Found error trace [2022-02-15 02:14:53,862 INFO L514 BasicCegarLoop]: trace histogram [31, 31, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-15 02:14:53,862 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2022-02-15 02:14:53,862 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-15 02:14:53,862 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-15 02:14:53,862 INFO L85 PathProgramCache]: Analyzing trace with hash -2140379764, now seen corresponding path program 30 times [2022-02-15 02:14:53,862 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-15 02:14:53,862 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [867819464] [2022-02-15 02:14:53,862 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-15 02:14:54,762 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:14:55,012 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:14:55,012 INFO L262 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-15 02:14:55,100 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:14:55,188 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:14:55,188 INFO L262 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-15 02:14:55,189 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-15 02:14:55,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 02:14:55,447 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-15 02:14:55,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 02:14:55,450 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-15 02:15:07,958 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-15 02:15:07,958 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [867819464] [2022-02-15 02:15:07,958 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [867819464] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-15 02:15:07,958 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-15 02:15:07,958 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [69] imperfect sequences [] total 69 [2022-02-15 02:15:07,959 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [220112022] [2022-02-15 02:15:07,959 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-15 02:15:07,959 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 69 states [2022-02-15 02:15:07,959 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-15 02:15:07,959 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2022-02-15 02:15:07,959 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=214, Invalid=4898, Unknown=0, NotChecked=0, Total=5112 [2022-02-15 02:15:07,960 INFO L87 Difference]: Start difference. First operand 105 states and 107 transitions. Second operand has 69 states, 68 states have (on average 1.4705882352941178) internal successors, (100), 67 states have internal predecessors, (100), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:15:21,825 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-15 02:15:21,825 INFO L93 Difference]: Finished difference Result 118 states and 124 transitions. [2022-02-15 02:15:21,825 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2022-02-15 02:15:21,825 INFO L78 Accepts]: Start accepts. Automaton has has 69 states, 68 states have (on average 1.4705882352941178) internal successors, (100), 67 states have internal predecessors, (100), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 104 [2022-02-15 02:15:21,826 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-15 02:15:21,826 INFO L225 Difference]: With dead ends: 118 [2022-02-15 02:15:21,826 INFO L226 Difference]: Without dead ends: 110 [2022-02-15 02:15:21,827 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 4 SyntacticMatches, 31 SemanticMatches, 133 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2778 ImplicationChecksByTransitivity, 19.3s TimeCoverageRelationStatistics Valid=538, Invalid=17552, Unknown=0, NotChecked=0, Total=18090 [2022-02-15 02:15:21,827 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 48 mSDsluCounter, 327 mSDsCounter, 0 mSdLazyCounter, 6697 mSolverCounterSat, 69 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 338 SdHoareTripleChecker+Invalid, 6766 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 69 IncrementalHoareTripleChecker+Valid, 6697 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.7s IncrementalHoareTripleChecker+Time [2022-02-15 02:15:21,827 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 338 Invalid, 6766 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [69 Valid, 6697 Invalid, 0 Unknown, 0 Unchecked, 6.7s Time] [2022-02-15 02:15:21,828 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2022-02-15 02:15:21,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 109. [2022-02-15 02:15:21,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109 states, 104 states have (on average 1.0288461538461537) internal successors, (107), 104 states have internal predecessors, (107), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:15:21,956 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 111 transitions. [2022-02-15 02:15:21,956 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 111 transitions. Word has length 104 [2022-02-15 02:15:21,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-15 02:15:21,956 INFO L470 AbstractCegarLoop]: Abstraction has 109 states and 111 transitions. [2022-02-15 02:15:21,956 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 69 states, 68 states have (on average 1.4705882352941178) internal successors, (100), 67 states have internal predecessors, (100), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:15:21,956 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 111 transitions. [2022-02-15 02:15:21,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2022-02-15 02:15:21,957 INFO L506 BasicCegarLoop]: Found error trace [2022-02-15 02:15:21,957 INFO L514 BasicCegarLoop]: trace histogram [32, 32, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-15 02:15:21,957 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2022-02-15 02:15:21,957 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-15 02:15:21,957 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-15 02:15:21,958 INFO L85 PathProgramCache]: Analyzing trace with hash 698665378, now seen corresponding path program 31 times [2022-02-15 02:15:21,958 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-15 02:15:21,958 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [482933133] [2022-02-15 02:15:21,958 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-15 02:15:22,146 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:15:22,413 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:15:22,414 INFO L262 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-15 02:15:22,492 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:15:22,615 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:15:22,615 INFO L262 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-15 02:15:22,615 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-15 02:15:22,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 02:15:22,810 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-15 02:15:22,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 02:15:22,812 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-15 02:15:36,572 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-15 02:15:36,572 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [482933133] [2022-02-15 02:15:36,572 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [482933133] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-15 02:15:36,572 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-15 02:15:36,573 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [71] imperfect sequences [] total 71 [2022-02-15 02:15:36,573 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [156193845] [2022-02-15 02:15:36,573 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-15 02:15:36,573 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 71 states [2022-02-15 02:15:36,573 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-15 02:15:36,574 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2022-02-15 02:15:36,574 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=221, Invalid=5181, Unknown=0, NotChecked=0, Total=5402 [2022-02-15 02:15:36,574 INFO L87 Difference]: Start difference. First operand 109 states and 111 transitions. Second operand has 71 states, 70 states have (on average 1.4714285714285715) internal successors, (103), 69 states have internal predecessors, (103), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:15:51,271 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-15 02:15:51,272 INFO L93 Difference]: Finished difference Result 121 states and 126 transitions. [2022-02-15 02:15:51,272 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2022-02-15 02:15:51,272 INFO L78 Accepts]: Start accepts. Automaton has has 71 states, 70 states have (on average 1.4714285714285715) internal successors, (103), 69 states have internal predecessors, (103), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 107 [2022-02-15 02:15:51,272 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-15 02:15:51,273 INFO L225 Difference]: With dead ends: 121 [2022-02-15 02:15:51,273 INFO L226 Difference]: Without dead ends: 113 [2022-02-15 02:15:51,274 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 4 SyntacticMatches, 32 SemanticMatches, 137 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2935 ImplicationChecksByTransitivity, 21.1s TimeCoverageRelationStatistics Valid=555, Invalid=18627, Unknown=0, NotChecked=0, Total=19182 [2022-02-15 02:15:51,274 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 48 mSDsluCounter, 337 mSDsCounter, 0 mSdLazyCounter, 7103 mSolverCounterSat, 70 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 348 SdHoareTripleChecker+Invalid, 7173 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 70 IncrementalHoareTripleChecker+Valid, 7103 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.8s IncrementalHoareTripleChecker+Time [2022-02-15 02:15:51,275 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 348 Invalid, 7173 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [70 Valid, 7103 Invalid, 0 Unknown, 0 Unchecked, 6.8s Time] [2022-02-15 02:15:51,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2022-02-15 02:15:51,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 112. [2022-02-15 02:15:51,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 107 states have (on average 1.02803738317757) internal successors, (110), 107 states have internal predecessors, (110), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:15:51,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 114 transitions. [2022-02-15 02:15:51,389 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 114 transitions. Word has length 107 [2022-02-15 02:15:51,389 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-15 02:15:51,389 INFO L470 AbstractCegarLoop]: Abstraction has 112 states and 114 transitions. [2022-02-15 02:15:51,389 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 71 states, 70 states have (on average 1.4714285714285715) internal successors, (103), 69 states have internal predecessors, (103), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:15:51,390 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 114 transitions. [2022-02-15 02:15:51,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2022-02-15 02:15:51,390 INFO L506 BasicCegarLoop]: Found error trace [2022-02-15 02:15:51,390 INFO L514 BasicCegarLoop]: trace histogram [33, 33, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-15 02:15:51,390 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2022-02-15 02:15:51,390 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-15 02:15:51,390 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-15 02:15:51,391 INFO L85 PathProgramCache]: Analyzing trace with hash -2098469428, now seen corresponding path program 32 times [2022-02-15 02:15:51,391 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-15 02:15:51,391 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [627782549] [2022-02-15 02:15:51,391 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-15 02:15:51,606 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:15:51,859 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:15:51,859 INFO L262 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-15 02:15:51,916 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:15:52,019 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:15:52,020 INFO L262 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-15 02:15:52,020 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-15 02:15:52,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 02:15:52,196 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-15 02:15:52,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 02:15:52,202 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-15 02:16:14,828 WARN L228 SmtUtils]: Spent 6.25s on a formula simplification. DAG size of input: 85 DAG size of output: 83 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-02-15 02:17:28,814 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-15 02:17:28,815 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [627782549] [2022-02-15 02:17:28,815 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [627782549] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-15 02:17:28,815 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-15 02:17:28,815 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [73] imperfect sequences [] total 73 [2022-02-15 02:17:28,815 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1614677487] [2022-02-15 02:17:28,815 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-15 02:17:28,816 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 73 states [2022-02-15 02:17:28,816 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-15 02:17:28,816 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2022-02-15 02:17:28,816 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=226, Invalid=5474, Unknown=0, NotChecked=0, Total=5700 [2022-02-15 02:17:28,817 INFO L87 Difference]: Start difference. First operand 112 states and 114 transitions. Second operand has 73 states, 72 states have (on average 1.4722222222222223) internal successors, (106), 71 states have internal predecessors, (106), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:17:29,288 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-02-15 02:17:29,288 INFO L93 Difference]: Finished difference Result 119 states and 121 transitions. [2022-02-15 02:17:29,289 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2022-02-15 02:17:29,289 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 72 states have (on average 1.4722222222222223) internal successors, (106), 71 states have internal predecessors, (106), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 110 [2022-02-15 02:17:29,289 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-02-15 02:17:29,290 INFO L225 Difference]: With dead ends: 119 [2022-02-15 02:17:29,290 INFO L226 Difference]: Without dead ends: 114 [2022-02-15 02:17:29,290 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 4 SyntacticMatches, 33 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 825 ImplicationChecksByTransitivity, 95.5s TimeCoverageRelationStatistics Valid=242, Invalid=5920, Unknown=0, NotChecked=0, Total=6162 [2022-02-15 02:17:29,291 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 6 mSDsluCounter, 409 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 418 SdHoareTripleChecker+Invalid, 380 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 362 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-02-15 02:17:29,292 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 418 Invalid, 380 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 15 Invalid, 0 Unknown, 362 Unchecked, 0.0s Time] [2022-02-15 02:17:29,292 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2022-02-15 02:17:29,453 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 114. [2022-02-15 02:17:29,453 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 114 states, 109 states have (on average 1.0275229357798166) internal successors, (112), 109 states have internal predecessors, (112), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:17:29,454 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 116 transitions. [2022-02-15 02:17:29,454 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 116 transitions. Word has length 110 [2022-02-15 02:17:29,454 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-02-15 02:17:29,454 INFO L470 AbstractCegarLoop]: Abstraction has 114 states and 116 transitions. [2022-02-15 02:17:29,454 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 73 states, 72 states have (on average 1.4722222222222223) internal successors, (106), 71 states have internal predecessors, (106), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-02-15 02:17:29,454 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 116 transitions. [2022-02-15 02:17:29,455 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2022-02-15 02:17:29,455 INFO L506 BasicCegarLoop]: Found error trace [2022-02-15 02:17:29,455 INFO L514 BasicCegarLoop]: trace histogram [34, 34, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-02-15 02:17:29,455 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2022-02-15 02:17:29,455 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-02-15 02:17:29,456 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-02-15 02:17:29,456 INFO L85 PathProgramCache]: Analyzing trace with hash -585997982, now seen corresponding path program 33 times [2022-02-15 02:17:29,456 INFO L126 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2022-02-15 02:17:29,456 INFO L338 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [801669381] [2022-02-15 02:17:29,456 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-02-15 02:17:29,691 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:17:29,842 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:17:29,843 INFO L262 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-15 02:17:29,922 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 1 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:17:29,998 INFO L89 AcceleratorJordan]: Jordan loop acceleration statistics: 2 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {1={1=1, 2=1}}, 1 SequentialAcceleration, 0 AlternatingAcceleration, 1 QuantifierFreeResult [2022-02-15 02:17:29,998 INFO L262 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2022-02-15 02:17:29,998 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-02-15 02:17:30,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 02:17:30,177 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2022-02-15 02:17:30,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-02-15 02:17:30,179 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-02-15 02:17:44,165 INFO L144 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2022-02-15 02:17:44,165 INFO L338 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [801669381] [2022-02-15 02:17:44,165 INFO L165 FreeRefinementEngine]: IpTcStrategyModulePreferences [801669381] provided 1 perfect and 0 imperfect interpolant sequences [2022-02-15 02:17:44,165 INFO L191 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-02-15 02:17:44,165 INFO L204 FreeRefinementEngine]: Number of different interpolants: perfect sequences [75] imperfect sequences [] total 75 [2022-02-15 02:17:44,165 INFO L118 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [945708029] [2022-02-15 02:17:44,165 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-02-15 02:17:44,166 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 75 states [2022-02-15 02:17:44,166 INFO L108 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2022-02-15 02:17:44,166 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2022-02-15 02:17:44,166 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=5773, Unknown=0, NotChecked=0, Total=6006 [2022-02-15 02:17:44,167 INFO L87 Difference]: Start difference. First operand 114 states and 116 transitions. Second operand has 75 states, 74 states have (on average 1.472972972972973) internal successors, (109), 73 states have internal predecessors, (109), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1)